The following is the established format for referencing this article:Munguia-Vega, A., J. A. Zepeda-Dominguez, M. F. Perez-Alarcon, I. G. Amador-Castro, S. Fulton, M. Walther, M. Rodriguez-Fuentes, C. M. Fumero-Andreu, and J. Torre. 2022. Social-ecological networks and connectivity within and between two communities of small-scale fishers in Mexico. Ecology and Society 27(1):24.
ABSTRACTAligning the ecological and social dimensions of the connections present between users that harvest a shared natural resource is a necessary step toward sustainable management. However, contrasting estimates of connectivity across disciplines is a challenging task and few empirical studies have focused on population dynamics within fish species with a complex life history. We used a collaborative approach merging citizen science, population genetics, oceanographic modeling, and interviews to collect empirical connectivity data of individual fish, fishing sites, and fishers. We integrated the data within a multilevel social-ecological network framework describing the interactions between two communities of small-scale fishers (Bahia Kino and Puerto Libertad, Sonora, Mexico) targeting leopard grouper (Mycteroperca rosacea). We identified two types of social-ecological links, including the use of specific fishing sites by individual fishers and the harvest of individual fish by individual fishers. Despite their fishing zones not overlapping, the ecological links between two communities located ~150 km apart were consistent and reciprocal where fishing grounds from each community acted as a source of fish to the other during the larval or juvenile/adult stages, respectively. As a result, fishers from the two communities frequently captured fish that were second-degree relatives. In contrast, the probability of social ties among fishers changed significantly depending on the type of connection and was considerably low for leadership and kinship although some communication was present. Our study highlighted how local actions (e.g., recovery from marine reserves or overfishing) are likely to impact the neighboring community as much as locally. The geographic scale and strength of key ecological process supporting fish stocks through the fish life cycle seem to be larger than those of social connections among fishers. Fishers and managers could benefit from a broader regional perspective that strengthens connections between communities about shared goals and activities. We examine some insights learned on the constraints of connectivity given different attributes of each ecological and social component and methodological challenges identified. We also discuss ways to improve collaborative management between the two communities.
Preserving the multiple services that marine ecosystems provide is one of the main challenges of modern civilization considering the huge extent of the human footprint on aquatic environments (Pauly and Zeller 2016, FAO 2020). Multiple interdisciplinary frameworks have been proposed to match management strategies to the social and ecological contexts of environmental problems to maintain ecosystem structure and function. Some of these frameworks include ecosystem-based management (Pikitch et al. 2004), social-ecological systems (Ostrom 2009), social-ecological alignment or fit (Cumming et al. 2006), collaborative governance (Bodin 2017), among others. Common to these frameworks is the need to understand connections within and between ecological and social elements to improve management outcomes. However, comparing empirical estimates of connectivity across disciplines is not easy (Turnbull et al. 2018). Some of the difficulties include the complexity of natural and social systems, the need of transdisciplinary research tools to assess and compare connectivity, and the obstacles of matching spatial and temporal scales of measurement.
A promising method for conceptualizing social-ecological connections is representing them within a network framework (Janssen et al. 2006, Bodin et al. 2019, Sayles et al. 2019). Networks can be used to show how people interact with a common ecological resource as a link, such as fishing (Bodin and Crona 2009). In this approach, networks are composed of nodes representing the social or ecological components and links representing their connections (Janssen et al. 2006). The social and ecological systems can be symbolized as separate but interconnected network layers in a multilevel network (Barnes et al. 2019, Bodin et al. 2019). Networks have the advantage of being flexible to represent diverse data, including for example the relationships within and between groups of people or organizations (Borgatti et al. 2009), or the export and import of fish larvae between sites driven by ocean currents (Treml et al. 2008). Besides explicitly accounting for the presence, intensity, and direction of connections in a spatial context, networks could reveal interdependence and feedback loops between components, and could be used to identify nodes that play key roles in the structure of the network (Turnbull et al. 2018, Sayles et al. 2019).
Social-ecological alignment or fit is accomplished when relationships between social actors are paired with links in the ecological network (Bodin 2017). Social-ecological alignment is usually associated with one or more indicators of sustainability, and contextual attributes that contribute to success are commonly identified (Epstein et al. 2015). In its simplest form, the problem of social-ecological fit could be exemplified by two sets of actors (e.g., two adjacent local communities of small-scale fisheries), each exploiting an ecological component (e.g., a particular fish species), which populations show strong interdependencies between them driven by the characteristics of the underlying biophysical system (e.g., ocean currents). If the actors that share the ecological component communicate with each other, it can facilitate coordination and cooperation toward sustainable management and increase the health and sustainability of the resource (Bodin 2017). This type of closed network structure could increase trust, learning, sharing of information, and enable establishing rules (Bodin et al. 2016). In contrast, the lack of social connections despite the presence of ecological links reduces the ability to address environmental problems effectively and reduces the likelihood of meeting socioeconomic and ecological long-term goals (e.g., avoid overfishing and associated loss of income due to stock depletion). A mismatch could also appear when the scales of ecological processes do not match the scales of governance structures (Cumming et al. 2006, Cumming and Dobbs 2020). Adaptive co-management of small-scale fisheries that promotes the participation of direct users, governments, and other stakeholders in decision-making processes have recently proliferated (d’Armengol et al. 2018). However, the discussion of principles for efficient governance has continued and is recognized as a key piece to overcome the underlying causes of overexploitation in fisheries (Quentin Grafton et al. 2007, Henry and Dietz 2011, Hilborn et al. 2020).
Small-scale fisheries in the Midriff Island Region (MIR) of the Gulf of California (GC), Mexico, targeting marine fish represent an ideal system to evaluate the challenges of measuring the connections between complex ecological and social systems. Most studies that simultaneously characterize ecological and social connections related to fisheries usually focus on trophic relationships among multiple species targeted by fishers (Yletyinen et al. 2018, Barnes et al. 2019, Kluger et al. 2019), or how fishing vessels interact with multiple fisheries (Fuller et al. 2017). However, ecological connections within any single one of those species are also important (Treml et al. 2015), but difficult to observe empirically and commonly ignored given their hidden nature. Fish populations are connected to each other via movements during different life history stages, including larvae, juvenile, and adult (Munguia-Vega et al. 2018). This type of ecological connectivity has demographic effects on population recruitment and abundance and its maintenance is crucial for the viability of local populations by shaping the metapopulation structure and resilience of a stock (Jones et al. 2009). For many species of marine fish and invertebrates, oceanographic currents mediate patterns of larval dispersal between sites, generally over a larger spatial scale compared to the movement of juveniles and adults within their home range, ontogenetic habitat shifts, or spawning migrations (Green et al. 2015, Munguia-Vega et al. 2018). Fisheries that exhibit spatial complexity where separated populations are linked via larvae and adult dispersal creates serious challenges to traditional fisheries management that assumes control of a single, spatially homogeneous stock via fishing mortality (Wilson 2006, Berger et al. 2017). Specifically, fishing could push a population across a threshold beyond which the successful reproduction is threatened, and ignoring the connections among fish populations could lead to disrupting demographic links, overexploitation, and loss of resilience of the system as a whole (Wilson 2006, Berger et al. 2017).
Fishers connect and interact with each other depending on different types of social ties, including kinship, communication, trust, reciprocity, leadership, co-occurrence of fishers in the same fishing grounds, etc. (Bodin and Crona 2009). Identifying social linkages provides channels (e.g., kinship ties, key players or leaders) for exchanging information (e.g., good fishing areas, permits, subsidies, new technologies, fisheries regulations, stock status) within and between communities in ways that could both support or hinder conservation and management efforts (Zetina-Rejón et al. 2020). Stakeholders’ relationships shape the structure of social networks, which can impact governance dynamics (Hartley 2010). The term “small-scale fishery” is commonly defined mostly by its technological characteristics (i.e., type of gear and boat length) and fishing regulations tend to focus solely on the action of “fishing” (i.e., regulating fishing access or fishing methods), putting sociocultural and commercial dimensions aside (Smith and Basurto 2019, Basurto et al. 2020). The MIR fisheries are de facto open access (Cinti et al. 2014) and although all fishers should operate under permits there is limited enforcement, particularly outside existing protected areas. Like most small-scale fisheries around the world, MIR fisheries are generally self-governed through informal arrangements under cooperative or non-cooperative structures, which translates to cooperatives versus a patron-client arrangement (Lindkvist et al. 2017). To gain fishing access, fishers either work for patrons or as part of cooperatives, with both typically commercializing their catches through intermediaries (Cinti et al. 2014, Basurto et al. 2020). Although fishers are most incentivized to join cooperatives when they live in communities with high transaction costs for selling and commercializing their catch, governance arrangements seem to develop depending on their social-ecological fit, and potential for adaptation to variability (Basurto et al. 2013a).
Our study focused on fishers targeting leopard groupers (Mycteroperca rosacea). The species shows a complex life history including spawning aggregations, a ~28-days pelagic larval stage after which juveniles travel to Sargassum spp. forests and later relocate to rocky reefs as adults (Munguia-Vega et al. 2014). Leopard grouper is the most heavily targeted grouper by small-scale and recreational fisheries in the GC (Sala et al. 2003, Erisman et al. 2010), and its population status is considered to be decreasing (Erisman and Craig 2018). Leopard grouper annual landings averaged 147 tons in the GC between 1999 and 2007 (Erisman et al. 2010). The species is exploited via hand lines or spearguns with support from surface-supplied air (hookah diving; Moreno-Báez et al. 2012). This small-scale fishery operates from small skiffs (7 m long), known locally as “pangas,” that are powered by outboard motors and manned by two to three fishers. The leopard grouper is part of the finfish fishery, which is managed via commercial permits that include more than 200 species exploited in Mexico, with no specific regulations regarding gear, catch, or size restrictions. No-take zones (fully protected marine reserves, fish refuges, etc.) represent the main spatial management tool implemented for leopard groupers and other finfish species in the MIR (Rife et al. 2013). Current efforts are underway to scale up the establishment of new marine reserve networks in the GC (Alvarez-Romero et al. 2018, Morzaria-Luna et al. 2020).
A first step toward evaluating the fit between social and ecological components in an environmental problem generally proceeds by characterizing the attributes of the ecological system and then comparing these to the attributes of governing institutions (Epstein et al. 2015). To this end and to help facilitate stakeholder engagement and co-management, this study aimed to use a multilevel social-ecological network as a framework to conceptualize and analyze the ecological and social connectivity between two adjacent communities of small-scale fishers targeting the same fish species. We were interested in estimating the level of interconnectedness between populations of leopard grouper targeted by each community and measuring the level of social connections present among fishers. Our specific objectives were (1) estimate the extent of overlap in the cohorts of fish caught and fishing sites used by each community, (2) measure the presence and strength of larval and adult dispersal in fish captured within and between the fishing grounds from each community, (3) quantify the presence and level of social connections within and between fishers from each community. We identified some characteristics of these ecological and social systems that promote or inhibit connectivity and discuss how the specific biophysical characteristics of the ecological system constrain the way collaborative arrangements should ideally be devised. Our main assumption was that, if strong ecological links are present between the two communities, then management decisions that improve (e.g., marine reserves) or reduce (e.g., overfishing) the size of the shared fish stock will have impacts on the adjacent community, and thus improving communication and co-management between the two communities could help toward sustainably managing the fishery.
The northern GC, which includes the MIR, has 45 islands and islets, and is a globally recognized marine biodiversity hot-spot (Alvarez-Romero et al. 2013). The northern GC region is of key importance for 17 communities of small-scale fishers, where nearly 80 fish and invertebrate species are targeted by > 3500 fishers using > 1600 pangas (Munguia-Vega et al. 2015). We focused our study on Puerto Libertad (PL) and Bahia Kino (BK), two communities located in the state of Sonora on the eastern shore of the GC (Fig. 1). PL is an isolated community of ~2800 inhabitants. Small-scale fishing is the main economic activity of ~200 local fishers with 119 pangas, focused on migratory species such as sharks, croakers, sierra, and yellowtail among others, along with coastal species including groupers and snappers (Espinosa-Romero et al. 2014). BK (~6000 inhabitants) is a larger and more economically diverse community, with at least 460 local fishers and 365 pangas according to a Spatial Fisheries Planning Program conducted in 2013 (Fernandez-Rivera Melo et al. 2018). Considering the ratio between the number of fishers and pangas (Johnson et al. 2017) and that there are two or three fishers per panga, the fisher population of both BK and PL is likely double or triple the reported number. BK is closest to the state capital and has access to better infrastructure than PL, including major roads in better condition that provide access to more varied market possibilities, fishing equipment, gear and supplies stores, etc. BK is also an important tourist destination (e.g., 25,000 tourists during spring break 2019).
Formalized fishing in this part of the MIR dates back to 1935, progressively increasing until the 1980s/1990s when the fishing activity became increasingly intensive and extensive (Frawley et al. 2019a). However, over the years, other economic activities have emerged in the community, including trade, cottage industries, crafts, tourism, and even livestock and family gardens (Moreno et al. 2005). Fishing for leopard groupers occurs during spring and summer in each community using different gear. In BK leopard groupers are caught with spearguns and hookah diving, whereas in PL the species is targeted with hand lines. Leopard grouper along with other fish (corvina, sierra, gulf coney) are the most important species in terms of economic value in PL. In BK, though the species is not the most important economically, it is found among 24 species recognized as important for its economic value or catch volume (Fernandez-Rivera Melo et al. 2018).
To obtain information about the use of fishing zones and the level of ecological connectivity between the fish captured by each community, in June 2016 we established a citizen science program with five fishers from each of the two communities that target leopard groupers. Sampling focused on obtaining information about fishing sites, tissue samples of fish for genetic analyses of kinship to estimate ecological connectivity, and size of the fish to approximate its age and distinguish parent-offspring from full-sib relationships. Fishers were provided with a sampling kit that included a global positioning system (GPS) to record the sampling location of each captured fish, a ruler to measure the total length of each organism, 1.5 ml pre-labeled screw-cap vials, ethanol, dissection scissors to collect fin clips as a source of DNA, and a water-resistant paper format to register the corresponding information. Fishers kept the contents of the sampling kit at the end of the study as an incentive for participating in the study.
To estimate the geographical extent and overlap among fishing zones within and between communities we built a geographic information system (GIS). We used the GPS coordinates of the sampling location of each individual leopard grouper collected from each fisher. We identified 11 fishing zones used by fishers of both communities based on a previously described delimitation of fishing zones of leopard grouper for the MIR (Munguia-Vega et al. 2014; Fig. 1). Fishing zones were defined by the 100 m isobath, inside which most small-scale fishing takes place, and also incorporated natural geographic features (islands) and existing marine protected areas.
To obtain empirical estimates of ecological connectivity for leopard groupers, we conducted genetic analyses with the tissue samples collected by the fishers from each community. We extracted genomic DNA from fin clips using the DNeasy Blood and Tissue Kit (QIAGEN) or with the salting-out method (Aljanabi and Martinez 1997). We genotyped 13 microsatellite loci on each sample, including five loci (Mros03, Mros05, Mros07, Mros11, and Mros12) previously described (Jackson et al. 2014). We also analyzed eight new markers isolated during the genomic sequencing run described in Jackson et al. (2014) that were genotyped using the same PCR conditions and methods referenced above (Appendix 1, Table A1.1), including loci Mros17, Mros18, Mros22, Mros25, Mros26, Mros27, Mros29, and Mros32. We estimated deviations from Hardy-Weinberg equilibrium (HWE) and linkage disequilibrium (LD) for each combination of loci and populations using GENEPOP 4.2 with 10,000 dememorization steps, 1000 batches and 10,000 iterations (Raymond and Rousset 1995).
Based on the data collected about total fish length, we categorized individuals into age classes for the analysis of genetic kinship following intervals obtained from a previous study of age-length relationships in leopard grouper (Diaz-Uribe et al. 2001). We assigned individuals into two groups based on their age: (1) candidate parents (older individuals with total length ranging from 52 to 90 cm corresponding to > 7 to 12+ years old); and (2) candidate progeny (younger individuals with total length ranging from 20 to 43 cm corresponding to > 1 < 5 years old). These two groups were separated by an age gap equal to the time for reproductive maturity, which is estimated at two years (Diaz-Uribe et al. 2001).
We used the genetic data to estimate two measures of ecological connectivity. First, we measured kinship identifying pairs of individual fish with a probability ≥ 99.0% of being first-degree relatives (e.g., parent-offspring, full sibs) or second-degree relatives (grandparent-grandchildren, half-sibs, avuncular: uncle, aunt, nephews, nieces) using the COLONY software (Jones and Wang 2010). We assumed a polygamous mating system for a diploid and dioecious species, a mutation rate for a microsatellite locus of 0.0005, and four long runs to estimate likelihood. Second, we detected first-generation migrants among the 11 fishing zones from the two communities using a Bayesian assignment method (Rannala and Mountain 1997) implemented in GENECLASS2 (Piry et al. 2004). For each individual fish, we assessed the likelihood ratio L-home/L-max using Monte Carlo resampling and simulating 10,000 individuals. Those individuals with a probability ≤ 0.01 of belonging to the population where they were sampled were identified as migrants. We constructed an asymmetric matrix among the fishing zones that represented the presence and frequency of the inferred migration events.
We estimated a third measure of ecological connectivity, namely, larval connectivity of leopard groupers driven by oceanic currents. We used the raw output of a previous study to estimate a directed larval connectivity network representing the probability of larval dispersal among the relevant fishing zones identified from the MIR (Munguia-Vega et al. 2014). Dispersal was estimated on the basis of a three-dimensional HAMSOM oceanographic model that simulated the oceanic currents during the spawning season (May and June) for a planktonic larval duration of 28 days and which accuracy was previously validated with genetic data (Munguia-Vega et al. 2014).
To identify the presence and level of social connectivity within and between fishers from BK and PL targeting leopard grouper, we used a non-probabilistic sampling based on a realistic approach (Zepeda-Dominguez et al. 2017). The realistic approach consisted of a structured interview, composed of open and closed questions, applied to 83 fishers (49 from BK and 34 from PL) that targeted leopard grouper and who represented all the different groups of interest (cooperatives, permit holders and free fishers) present within each locality (Zepeda-Dominguez et al. 2015). The number of fishers interviewed represent 10.6% (BK) and 17% (PL) based on the latest available estimates of the number of fishers targeting all species in each community. The survey sought to identify the main leopard grouper fishers of the MIR and the existing social relationships within and between the two communities. We identified five variables of interest to measure social connectivity, specifically communication, trust, reciprocity, leadership, and kinship (Bodin and Crona 2009). Communication refers to the existence of any information exchange between fishers. We considered trust as the intention to accept vulnerability based upon positive expectations of the intentions of the behavior of another person (Ostrom and Walker 2003). Reciprocity was understood as the conditional behavior depending on the perceived intentions behind the actions of others (Cox 2004). Leadership was defined as the capability of an actor to exert influence over the other fisher’s decisions. These variables were ranked from bad to excellent on a numerical scale (1 being bad and 5 was excellent; see Appendix 2, Table A2.1 for details). The fishers identified in this interview were then used in a second interview to identify kinship among fishers (first- and second-degree relatives, as defined above). For the design, validation, and application, regular protocols for social research were observed: every fisher was informed about the project, including the goals, the methodology, the anonymity of the data, and the policy of not sharing any information for purposes different from those consented. We also provided channels to express any concern or refusal to include their information and a way to contact a technical person responsible for the project (Fontana and Frey 2005). With the data obtained for the five variables describing social interactions, we generated five adjacency matrices (kinship, communication, trust, reciprocity, and leadership). Matrices represented binary data for the presence or absence of a social relationship between two fishers.
Contrasting ecological and social networks
Network analyses use graph theory to study the topological and functional relationships of nodes (Newman 2003), which in our study were represented by fish, fishing sites, and fishers, as a tool to understand the dynamics of social-ecological systems (Sayles et al. 2019). Social network analysis has been used successfully for the structural characterization of natural resource management systems (Prell et al. 2008). Two actors who share a social bond over time will influence each other, tending to increase the similarity between the two. If, in addition, this link is deep or multiple (they are friends, coworkers, close relatives), the probability of similarity will increase (Prell 2012). In the context of fisheries management, social network analysis has been used to associate structural attributes with management characteristics and their performance (Bodin and Crona 2008, Hartley 2010).
The matrices describing three ecological relationships and five social ties were analyzed and visualized using a graphic network approach with the software GEPHI (Bastian et al. 2009). In ecological networks, the nodes of the kinship network were represented by individual fish analyzed, whereas for the fish migrants and the probability of larval dispersal nodes were represented by the fishing zones used by each community and links defined by the presence/absence and intensity of ecological connectivity among them. In social networks, nodes represent individual fishers connected by the five types of social ties. To analyze the role of each node in the network structure, we used the eigen centrality index to measure the importance of each node as its positional relevance (Wasserman and Faust 1994). Eigen centrality is a measure of a node’s influence on a network. For its calculation, relative scores are assigned to all the nodes in the network; a node will have a high score if it is connected to highly connected nodes, and conversely it will have a low score if it is connected to poorly connected nodes. This means that the own-vector centrality is proportional to the sum of the centralities of the nodes with which it is connected (Bonacich and Lloyd 2001).
To compare the level of connectivity within and between the two fishing communities in each ecological and social network, we estimated the density from the three ecological and five social networks. For each network, we defined density as the number of links observed divided by the maximum number of possible links (Janssen et al. 2006), while ignoring the diagonal of the matrix. Density represents the probability that any given tie between two random nodes is present (Hanneman and Riddle 2005). A network has a maximum density of 1 if all possible links among all nodes are present and a minimum density of 0 if no links are present. Estimates of density can be used to compare the level of cohesiveness or saturation among different networks and are related to some functional attributes like the level of resilience of the network (Janssen et al. 2006). All the networks were treated as directed networks. In each network, we calculated density considering links as a binary variable (i.e., present or absent) in four sub-networks to decompose the probabilities of finding a link within compared to between the two communities: (1) a subnetwork labeled BK including links only between nodes belonging to Bahia Kino; (2) a subnetwork labeled PL including links only between nodes from Puerto Libertad; (3) a network labeled All including all the nodes and links; and (4) a subnetwork labeled BK-PL excluding the links within each community and considering only the potential ties exclusively between two nodes from different communities. We evaluated statistical differences in the observed densities of networks and subnetworks by computing the sampling variance of the estimated densities by using bootstrapping and the “Compare Densities” function in UCINET 6.718 (Borgatti et al. 2002). This method is analogous to the classical paired sample t-test for estimating the standard error of the difference. We generated a sampling distribution of density measures in 10,000 random sub-samples to account for the interdependency of network data.
Our citizen science program with 10 fishers allowed us to collect tissue samples, total length, and geographic coordinates from 776 leopard grouper individuals. Eight fishing zones for BK and three for PL were identified, and fishing zones used by each community did not show any overlap (Fig. 1). Fishers from BK used all the islands in the Midriff Island Region (MIR), and some individual fishers traveled up to 200 km from their community to their fishing sites. Fishers from PL exclusively fished at sites near their community and within a 50 km radius. In both communities, fishers shared between one and three fishing zones with other fishers from their community.
Each fishing community targeted fish from different cohorts that varied considerably in size. Fishers from BK captured fish that were significantly smaller (average length 45.06 cm, N = 379) than those captured by fishers from PL (average length 64.20 cm, N = 397, Fig. 2). These fish sizes corresponded to a mean age of five years for fish from BK and nine years for PL.
Our first measure of ecological connectivity was based on genetic kinship analyses of 282 fish that passed strict quality controls (Appendices 3–6), from which 138 fish were from BK and 144 fish were from PL. We found 355 first- and second-degree relationships among the genotyped fish, of which 111 (31.26%) were from fish captured within PL fishing grounds, 79 (22.25%) were from fish captured within BK fishing grounds, and the majority (165, 46.47%) were between pairs of fish captured in the fishing zones of two distinct communities (Table 1, Fig. 3a). From all relationships, only 4.78% (17) were between first-degree relatives. All first-degree relationships were found within the fishing zones of PL, including three parent-offspring and 14 full-sibling pairs. According to the analyses of eigenvector centrality, most of the important nodes in the network of genetic relationships were fish from PL (Fig. 3). The probability of observing a kinship link within two random fish (i.e., density) in the subnetworks within and between communities was small (< 1%) and within the same order of magnitude. Despite density being slightly lower within BK (0.41%), we did not observe any significant difference compared to PL (0.53%), neither with the network including all fish (0.44%) or with the comparison focused between the two communities (0.41%; Fig. 4, all P values > 0.058, Appendix 7, Table A7.1).
Our second measure of ecological connectivity based on the identification of first-generation fish migrants revealed 60 of the 282 fish as migrants (21.27%) whose genotypes were more likely to have originated in a different fishing zone from where they were captured (Fig. 5a, Table 1). Strong connections were observed in a southward direction indicating the migration of individuals from the central fishing zones of PL toward the fishing zones of BK in the MIR. The 60 migrants were distributed into 29 links, from which 11 (37.93%) were between BK fishing zones, 3 (10.34%) were between PL fishing zones and the bulk (15, 51.72%) were between fishing zones from two different communities. We observed the highest density in the subnetwork of migrants among PL fishing zones (50%), which was significantly higher than the value observed among BK fishing zones (19.64%, P = 0.001), larger than the density of the network including all fishing zones (26.36%, P = 0.001) and higher than the comparison between the fishing zones of the two communities (31.25%, P = 0.025, Fig. 4, Appendix 7, Table A7.1).
Our third measure of ecological connectivity based on an oceanographic model of larval dispersal for leopard grouper (Munguia-Vega et al. 2014) showed 50 larval dispersal links, from which the majority (34, 68%) were between BK fishing grounds, followed by 13 links (26%) between different communities showing strong northward connections from the fishing zones of BK toward fishing zones from PL (Fig. 5b, Table 1). Only 3 links (6%) were observed between PL fishing zones. The density of subnetworks varied from 60.71% within BK fishing zones, to 50% within PL, and 45.45% overall, which were significantly higher than the density observed between the two communities (27.08%, all P values ≤ 0.031, Table 1, Fig. 4, Appendix 7, Table A7.1).
From 83 fishers that were interviewed for the analyses of kinship (49 from BK and 34 from PL), our first measure of social connectivity based on kinship among fishers identified 83 connections, from which most (51, 61.44%) were among PL fishers, compared to 30 links among BK fishers (36.14%), while there were only 2 connections (2.4%) between the two communities (Table 1, Fig. 3b). From all observed relationships, 26 (31.32%) were between first-degree relatives: 13 within BK, 11 within PL, and only two between the two communities. Analysis of eigenvector centrality showed that all of the most important nodes were fishers from PL (Fig. 3b). The density of the subnetwork of kinship among fishers was significantly higher within PL (4.54%) compared to within BK (1.27%, P = 0.001), also higher than the overall network (1.21%, P = 0.042) and larger compared to the comparison between links from the two communities (0.06%, P = 0.015, Fig. 4, Appendix 7, Table A7.1).
Communication, trust, and reciprocity
Our second, third, and fourth measures of social connectivity among fishers (communication, trust, and reciprocity) showed almost identical results among them. Social connections were more frequent within fishers from PL compared to BK, and there was a significant number of social connections between the two communities (Fig. 6a, Appendix 8, Fig. A8.1). We identified 235 communication links overall, from which 97 (41.27%) were among PL fishers, 130 (55.31%) were between fishers from distinct communities, and only 8 (3.40%) were among BK fishers. The density of the subnetworks for communication was consistently higher within PL (8.64%), and an order of magnitude lower within BK (Fig 6a, 0.34%, P = 0.001, Fig. 4, Appendix 7, Table A7.1). Comparatively, the density of the overall network and the comparison between communities showed intermediate values (3.45% and 3.90%) that were significantly different from the values observed within communities (All P values ≤ 0.023). Relationships between communities for these three variables were symmetrical because communication, trust, and reciprocity were frequently observed from BK fishers toward PL fishers and vice versa. The networks contained a few isolated nodes, suggesting that some of the interviewed fishers did not communicate, trust, or have reciprocal relationships with others.
Our fifth measure of social connectivity (leadership) showed similar levels of social connections within fishers from BK compared to PL, but a much lower frequency of social ties between the two communities (Fig. 6b). From 253 leadership ties identified, 127 (50.19%) were among BK fishers, 94 (37.15%) were among PL fishers, and only 32 (12.64%) were between fishers from the two communities. The density of the subnetwork for leadership was significantly higher within PL (8.37%) compared to within BK (5.39%, P = 0.005), the overall network (3.71%, P = 0.023) and the comparison between the two communities (0.96%, P = 0.001, Fig. 4, Appendix 7, Table A7.1). Notably, leadership relationships between communities were present but were completely asymmetrical. According to BK fishers, 15% of the individuals identified as leaders were from PL, while the rest were fishers from BK (Fig. 6b). In contrast, fishers from PL did not recognize any leaders within BK.
Comparisons within ecological and social networks
Comparisons within BK
According to our statistical analyses, the probability of finding an ecological link within BK fishing grounds was significantly higher for larvae (60.71%) compared to fish migrants (19.64%, P = 0.001), and higher for fish migrants compared to fish kinship ties (0.41%, P = 0.001). In terms of social networks, we found a significantly higher probability of finding leadership ties (5.39%) compared to kinship ties (1.27%, P = 0.001), and a higher probability of kinship ties compared to communication ties (0.34%, P = 0.025, Fig. 4, Appendix 7, Table A7.2).
Comparisons within PL
We found that the probability of finding an ecological link within PL fishing zones was identical for larvae and fish migrants (50%), and both were significantly higher than the probability of finding fish kinship ties (0.53%, P = 0.001). The probability of finding any social tie among fishers within PL was not statistically different for any social measure tested (all P values ≥ 0.506, Fig. 4, Appendix 7, Table A7.2) including kinship among fishers (4.54%), communication (8.64%), and leadership (8.37%).
Comparisons between BK and PL
When considering the entire ecological network, the probability of finding an ecological link between any fishing zone included in the analyses was not statistically different for larvae (45.45%) compared to fish migrants (26.36%, P = 0.063), but these two were significantly more likely than finding fish kinship ties (0.44%, P = 0.001). When the ecological links within each community were excluded and we focused on the potential ties exclusively between communities, the probabilities observed were also similar for larvae (27.08%) and fish migrants (31.25%), that were more likely than finding a fish kinship tie (0.41%, Fig. 4, Appendix 7, Table A7.2).
In the social network considering all fishers and all links, it was similarly likely to find a social tie in terms of leadership (3.71%) or communication (3.45%, P = 0.334), and both were more likely than finding kinship ties (1.21%, P ≤ 0.007). However, when the social links within each community were excluded and we focused on the potential ties exclusively between communities, it was much more likely to find a communication tie (3.9%) compared to leadership (0.96%) or kinship (0.06%).
Contrast between ecological and social networks
A diagram showing a multilevel social-ecological network, including all the ecological and social components analyzed and focused on the connections between the two communities highlights at least two types of social-ecological links present in our study system (Fig. 7). The first set (social-ecological links 1) was represented by the use of fishing sites by fishers. Although fishers from each community do not show any overlap in the use of fishing zones, their fishing zones themselves show multiple ecological links based on larval dispersal and fish migrants. The second set of social-ecological links was represented by the fish caught by fishers, showing that it is common to find kinship ties between any two leopard groupers caught by fishers from distinct communities. Importantly, some social ties, for example, based on kinship among fishers, were sometimes nearly absent between the two communities. In two of our ecological variables (larval dispersal and fish migrants between fishing sites) the likelihood of finding an ecological tie was always significantly higher than finding a social tie, both within and between the two communities of fishers (Fig. 4, Appendix 7, Table A7.3). Although there were differences between the probability of finding an ecological versus a social connection, comparisons between networks of different size are a methodological challenge.
This study applied a collaborative approach merging citizen science, population genetics, oceanographic modeling, and interviews. We showed how empirical estimates of multiple ecological and social connections in the harvesting of a marine resource can be estimated and integrated for analysis of the interactions within the conceptual framework of multiple one-level networks that could be assembled into a multilevel social-ecological network. However, our ability to measure explicit social-ecological links was limited by the small number of fishers from whom ecological data was acquired. Also, the statistical comparison of properties of ecological and social networks displaying drastically different sizes is problematic. Below, we discuss some insights learned while comparing the level of ecological and social connectivity and challenges identified. We also examine some patterns observed on the constraints of connectivity given different attributes of each ecological and social component. Finally, we discuss how this information could be used to inform ways to improve collaborative management.
Although we showed detailed connections within ecological and social levels and between the two levels, a fully articulated social-ecological multilevel network typically considers all links simultaneously (Bodin 2017, Sayles et al. 2019). The number of fishers involved in the citizen science program in our study was limited to five fishers from each community. Thus, the information gathered about explicit social-ecological links represents only 10 individual fishers from a much larger universe. The effort to empirically characterize even a modest number of relevant social-ecological links grows exponentially with the number of fishers, fish, and fishing zones and seems daunting even for a single species and two communities. Thus, novel approaches would need to be developed in order to quickly and massively characterize ecological connections among multiple fish populations, for example, via environmental DNA metabarcoding (Sigsgaard et al. 2020; Valdivia-Carrillo et al. 2021). Additionally, we did not consider ecological connections for leopard grouper from other adjacent fishing communities (e.g., Bahía de los Angeles and Puerto Peñasco) that show significant import or export of larvae from/toward BK and PL fishing sites (Munguia-Vega et al. 2014, Jackson et al. 2015). These observations stress the problem of defining boundaries of social-ecological networks, which alter the number of nodes and the properties of the networks being studied.
Social-ecological links between communities
The scientific literature recognizes a lack of consensus about what constitutes social-ecological fit and how and at which scales it should be better measured (Bodin et al. 2019). Compared to previous studies of social-ecological networks in fisheries that focused on trophic relationships among targeted species and resource users (Yletyinen et al. 2018, Barnes et al. 2019, Kluger et al. 2019), our study highlighted source-sink metapopulation dynamics for a species with a complex life history at the level of individual fish, fishers, and fishing sites. However, even when networks are a flexible tool for investigating diverse types of data, a key challenge remains in performing quantitative analyses to compare connections in mixed social-ecological networks (Janssen et al. 2006). Our approach attempted a quantitative comparison of the likelihood of finding ecological and social links employing network density as a common measure to compare disparate networks. In our statistical analyses, ecological links between fishing sites from the two communities were more likely to be present than any social tie among fishers. For example, in a direct comparison of the same variable (kinship) between individual fish and fishers from the two communities, kinship was an order of magnitude less likely to be present between fishers compared to fish. So, although not completely absent, social ties between the two communities were weak compared to ecological links. These results suggest little mobility of individual fishers between the two communities despite significant movement of leopard groupers through their life cycle between fishing sites. Thus, the geographic scale and strength of key ecological processes supporting fish stocks through the fish life cycle seem to be larger than those of social connections among resource users. This suggests some level of governance challenge due to a lack of network closure, where the two actors exploiting interconnected ecological resources lack strong collaboration (Bodin et al. 2016). Resource users and managers could benefit from a broader, regional perspective that connects fishers from distinct communities toward shared goals and activities, e.g., monitoring of stock status and management actions. However, a key challenge in establishing mismatches between ecological and social networks is the resolution of what the nodes and links represent in the network. For example, in our study there was an order of magnitude difference between the number of fishing sites (11), fishers (83), and fish (282). The number of nodes in the network defines the number of potential links present, thus density in a network decreases exponentially with increasing network size. This bias could also contribute to the fact that probabilities of finding ecological links among fishing sites were an order of magnitude larger than the probability of finding any social ties. Alternative analytical methods to compare social-ecological networks include motif frequency counts (e.g., of closed network structures) and exponential random graph modeling (ERGM) to test against a null model assuming a uniform likelihood of finding links between nodes (Barnes et al. 2019, Sayles et al. 2019).
Our study revealed strong leopard grouper connectivity between two communities of fishers, even when they were geographically distant (150 km apart), targeted different cohorts of the same species using distinct fishing gear, and used completely different fishing zones that do not show any spatial overlap. The latter could be explained by the presence of valuable fishing zones closer to home, the use of different fishing gear targeting distinct cohorts, and informal agreements about the traditional fishing zones of each community. Ecological links between the two communities were within the same order of magnitude and equally or more likely to be present compared to links within each community. The relevance of ecological connections between the fishing zones from the two communities varied along the life history of the fish, creating a reciprocal ecological relationship in terms of source-sink metapopulation dynamics. The ecological network based on larval dispersal showed BK fishing zones as a source of larvae for PL fishing grounds following the predominantly cyclonic circulation of oceanic currents during the spawning season of leopard groupers in the study region (Munguia-Vega et al. 2014). In contrast, the analysis of migrants suggested that larvae, juvenile, and adult fish from the fishing zones of PL also migrate to BK fishing grounds. Thus, management decisions that occur within the fishing zone of one community and that directly affect the size and reproductive potential of the fish stock can have strong demographic impacts on the availability of leopard grouper in the other community. For example, overfishing in the fishing zones of BK could negatively impact PL by reducing larval recruitment. In contrast, the recent establishment of a marine reserve in the fishing grounds of PL (DOF 2017) could translate into a spill-over effect of migrant individuals that could directly benefit BK fishers. The recognition of how local fish populations are ecologically linked to each other is essential to maintain population resilience and avoid overexploitation (Wilson 2006, Berger et al. 2017). In terms of resilience, the high density observed in the combined ecological network could suggest high resilience of the system (Janssen et al. 2006), for example, if any particular node disappears, e.g., a particular site is overfished.
In contrast to ecological links that were consistently present between the two communities, our results showed the probability of finding a social tie among fishers changed significantly depending on the type of social connection. Strong ecological connections are not echoed by strong social ties in our study system, and fishers from the two communities do not currently have stable channels for information flow. The probability of social ties was relatively modest for communication, trust, and reciprocity, significantly lower for leadership and almost absent for kinship. The likelihood of observing communication, trust, and reciprocity between the two communities was intermediate compared to the values observed within each community. Leadership and kinship ties were significantly less likely to occur between rather than within the two communities. In contrast, a previous study of social networks conducted in 2007 in the MIR found strong kinship ties between BK and PL (Duberstein 2009), highlighting that social connections evolve and might not be static over time. However, it is also likely that, by interviewing only between 10% to 17% of all the fishers from each community, we missed documenting some social connections. Notably, leadership ties were strongly biased in terms of the recognition of leaders from the smaller community according to fishers from the larger community, but not vice versa. All other social relationships observed between the two communities were symmetrical. The asymmetry could be related to the fact that fishers from the smaller community (PL) are more likely to travel to BK than the other way around because they need to report their catches at the local fisheries office from the National Fisheries and Aquaculture Commission (CONAPESCA) in BK. Overall, leaders from the smaller community seem to play a key role in bridging barriers for communication between the two communities.
Even when the fishing zones of each community regarding leopard groupers do not overlap, they do for other fisheries including gillnets targeting Pacific sierra, Pacific angel shark, and smooth-hounds, for which fishers from both communities travel to several islands in the MIR (Moreno-Báez et al. 2012). According to Duberstein (2009), fishers from PL and BK converge at 56 fishing areas, particularly in fisheries where they use gillnets and diving as fishing techniques. This indicates that the multi-species social-ecological networks are much more complex than presented here for a single species and that patterns could vary with different fishing gear. However, our approach could in principle be scaled up to integrate multiple species, communities, and fisheries. Social-ecological systems in small-scale fisheries are complex and it may be challenging to characterize each interaction and the effects they have on the environment considering small-scale fishers target dozens of different species (Leslie et al. 2015). These different species also show a large variation in life history, including habitats for recruitment, reproductive periods and planktonic larval durations, the presence of migratory behaviors, etc., that translate into contrasting patterns of ecological connectivity within each life history combination (Munguia-Vega et al. 2018). Because leopard groupers are also targeted by recreational fisheries, decisions made by small-scale fishers could affect effort, economic return, cost, fish population, and recruitment in this sector (Leslie et al. 2009). Further studies could provide direct evidence linking the structure of the social-ecological networks identified here and specific ecological and management outcomes that we did not measure, such as fish abundance, stock status, presence of cooperatives, etc.
Social-ecological links within each community
We identified that the spatial scale over which connectivity occurs, the size of the population from which the sample is drawn, and the spatial resolution of the analyses (defined by the number of nodes present in the networks) exerted a large influence on various aspects of social and ecological connectivity. For example, the results of kinship analyses among fishers within each community were similar to those of fish in that both showed a higher frequency of first-degree relatives within the smaller community (PL). This could be due to a general effect where kinship increases when the population size is smaller (Blouin 2003), which holds true for both fishers from PL and fish caught in their fishing zones that, comparatively, were also much smaller compared to the larger community.
The strength of the ecological connections was the result of the interaction between the geographic scales of the fished areas and the spatial scale at which leopard grouper individuals move, first as larvae, e.g., hundreds of kilometers, then as adults, e.g., tens of kilometers (Munguia-Vega et al. 2018). For example, in the eight fishing areas of BK spread over multiple islands of the MIR, ecological links based on larval dispersal were more likely to occur than links from migrants that include juvenile and adult dispersal. In contrast, both larval and migrant links were equally likely among the three adjacent fishing zones from PL. The observation of larger fishing areas in BK agrees with a previous study documenting travel distances up to 200 km, compared to the other communities in the northern GC (Duberstein 2009, Moreno-Báez et al. 2012). The higher competition within a larger community could force fishers to take longer trips to distant fishing zones if local resources have been overexploited.
We found that all different types of social connections studied, including kinship, communication, trust, reciprocity, and leadership, were all equally likely to be present in the smaller community (PL), whereas in the larger community (BK) the probability of finding distinct social ties varied significantly. This observation is consistent with several studies showing a positive relationship between the degree of cooperation within a group and the level of kinship (Smith 2014, Enke 2018), which could explain the presence of robust social ties for all types of social connections investigated within PL. In contrast, in the larger community it was more likely to find a leadership tie than a kinship tie among fishers, and comparatively it was even less likely to find a communication, trust, or reciprocity tie. The fact that we interviewed a larger fraction of fishers in PL (17%) compared to BK (10%) could also have contributed to finding stronger social links in PL. The level of leadership could be explained by the longer investment of civil society organizations in BK into capacity building for fishers to strengthen the negotiation and conflict resolution skills of individuals and cooperatives. However, leadership in BK does not translate into the same level of communication or trust. Generally, all the types of social ties were more likely to be present among fishers from the smaller community compared to the larger one. This is also in line with small group size being a strong predictor of successful governance (Ostrom 1990). Trust among local fishers (as individuals) and members of cooperatives affect fishing patterns and fisheries sustainability. As long as cooperatives and patrons find reliable local fishers to work with, they have no need to recruit outsiders, which could otherwise increase fishing pressure and the risk of overfishing, as has been extensively documented (Basurto et al. 2020).
Besides kinship and group size, a lower level of social cohesion between fishers in a large community could be driven by other demographic processes, including recent immigration. A previous study suggested that high immigration rates in BK were associated with the presence of weak norms of trust and reciprocity, and low social capital, resulting in a challenge for fishers to develop relationships and invest in building fishing co-ops (Basurto et al. 2013a). As a result, their open access status quo has led to overharvest (Basurto et al. 2013b). Similarly, high levels of trust in smaller isolated communities could be positively associated with homogeneity with respect to ethnicity and social and economic relationships (Ostrom and Walker 2003). Other factors including lower access to information and education are likely to promote stronger local norms and lower variability within a smaller and isolated community, whereas greater individuality is expected in larger and more connected areas with higher access to education and information (McClanahan and Abunge 2018).
Implications for collaborative management
The uncovering of strong reciprocal ecological connections between two communities of small-scale fisheries in the presence of relatively weak and sometimes asymmetric social ties, highlights the importance of collaboration to plan and implement commonly agreed regulations and harvesting practices to ensure sustainability. Our data suggested that fishers from these two communities do not interact with each other at sea (at least for the leopard grouper fishery), therefore we recommend the creation of new venues for collaboration or strengthening of existing collaborative efforts.
Although some settings do exist for fishers within each community to improve governance, promote sustainable practices, and work toward a common vision, formal venues for fishers from both communities to cooperate are very limited. Both communities have community committees for fisheries and aquaculture management that represent cooperatives, permit holders, and free fishers (Espinosa-Romero et al. 2014), which do not have management authority but provide a common voice to the government to request or recommend changes. Nevertheless, the two committees do not currently interact. There is often a significant difference between communities regarding the perceived costs and benefits of fishery restrictions such as size limits, closures, gear management, and others (McClanahan and Abunge 2018). Regional forums could provide an understanding of how both communities can manage their resources to maximize their shared benefits by identifying and communicating the nature and extent of ecological interactions (larval recruitment, spillover effects, and adult migration). Shared norms, social capital, and a shared governance of common resources, can only emerge from repeated and extended interactions that create interdependence and shared identities and interests among community members (McCay et al. 2014). It has been documented that fishers’ participation in local fisheries management depends on the fishing access strategy they are associated with. As members of cooperatives, fishers are more likely to be able to create more trustworthy relationships and to participate in decision-making forums about fishing activities, financial distribution of benefits, working conditions, etc. (Basurto et al. 2020).
Social relations developed among individuals are part of their social capital, which enables network members to have access to different types of resources or benefits, including access to markets, increased income, and access to knowledge (Pedroza-Gutiérrez and Hernandez 2017). These relationships, as supported by the network exchange theory, provide a higher adaptive capacity to fishers that have a stronger and larger network, favoring those center positions compared to peripheral positions in the network (González-Mon et al. 2019). Social interactions among fishers from distinct communities are important in the face of increasing environmental variability in the Gulf of California and elsewhere (Frawley et al. 2019b). The behavior of small-scale fishers and their spatio-temporal movements respond to changes in their target fisheries (Sievanen 2014, González-Mon et al. 2021). Knowledge plays a key role in some of the most common responses of fishers to climate variability, including moving fishing locations, diversifying fisheries or occupations, or switching gear types (Sievanen 2014).
Other initiatives that already promote some collaboration between communities also include (1) underwater monitoring groups of fishers trained in SCUBA diving to help evaluate marine reserves (Fulton et al. 2019); (2) a gender equality program where men and women from several fishing communities in Mexico, including PL and BK, are trained to promote gender equity and equality; (3) fisheries improvement project (FIP) for clams (https://fisheryprogress.org/fip-profile/mexico-puerto-libertad-clams-hookah), where some fishers from BK and PL participate with government agencies from the fisheries sector.
In November 2017, the results of this study were presented separately to fishers from BK and PL. Both communities were receptive and expressed the importance of having stronger communication to collaborate with fishers from the other community. The information about how an individual fish they captured at a particular fishing site was a close relative of another fish captured by a fisher from the same or adjacent community resonated the most in terms of their appreciation of social-ecological connections. This unexpected response is consistent with the presence of alternative relational values between fishers and tangible ecological elements, as opposed to theoretical or conceptual generalizations (Chan et al. 2016). They were both interested in meeting to establish agreements (i.e., pricing, size limits, fishing effort) regarding the leopard grouper and other fisheries they share. Exchanges are well-documented tools for promoting learning, understanding, and knowledge transfer (Gardner et al. 2017, Thompson et al. 2017). However, within a particular region, they can be effective tools in creating unity, empathy, and changing the mental model about the ecological interdependence between adjacent communities. Fishers who share a resource but are unfamiliar with how neighboring communities live and work will be less likely to consider them when making decisions that affect the fishery. The recognition of some ecological interactions can significantly contribute to the understanding and management of ecosystems, thus more intensively managing these interactions, particularly for key functional taxa such as the leopard grouper, can help resource users plan local adaptations to local problems (McClanahan et al. 2009). Other examples of successful co-management exist in the region, where a concession system for benthic resources promotes cooperatives from neighboring communities to closely collaborate (McCay et al. 2014).
In the management of fisheries, as in other common property resources, there has been a shift from agreements between two sectors (fishers and government) to co-management agreements between multiple sectors involved in the use of fishery resources (Gibbs 2008, Ponce-Diaz et al. 2009). In many cases, fisheries management changed from a hierarchical to a network structure. Instead of the government agencies being the only ones that dictate the rules, the different institutions communicate with each other to reach agreements that regulate the activity (Pomeroy 2003). Thus, the current global trend in fisheries systems is toward a reticular structure. Central actors, identified in our study as fishers from PL, have more social ties than others and are well situated to execute leadership that facilitates regional collective action. Regional committees, including fishers from other fishing communities beyond PL and BK could also help create dialogue spaces for resource users at the scale at which ecological connections are present.
RESPONSES TO THIS ARTICLEResponses to this article are invited. If accepted for publication, your response will be hyperlinked to the article. To submit a response, follow this link. To read responses already accepted, follow this link.
Research was made possible through the generous support of Bennett and Jacquie Dorrance. Comunidad y Biodiversidad A.C. received funding from the David and Lucile Packard Foundation, the Marisla Foundation, the Sandler Supporting Family Foundation, and the Walton Family Foundation. The Nature Conservancy received funding for this project from Fundación Televisa. We thank the fishers who participated in the citizen science program and helped us to collect samples and data in the field, David Paz-García and Eric Ramírez-Saucedo for their support during DNA extraction and microsatellite genotyping, and Mario Vergara-Rodarte for conversations that improved the project. AMV and JAZD worked as consultants for Comunidad y Biodiversidad A.C. for this project. We also thank the contributions by three anonymous reviewers and the subject editor that helped to improve the manuscript.
The data supporting the findings of this study are available as Supplementary Material.
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Table 1. Characteristics of three ecological (kinship, larvae, migrants) and five social (kinship, communication, trust, reciprocity, leadership) networks within and between two communities of small-scale fishers. We show the number of elements or nodes in the network (N), the maximum number of possible links, observed number of links, the average density of the network, and standard deviation (SD). We show data decomposed into four sub-networks: (1) a subnetwork labeled BK, including links only between nodes belonging to Bahia Kino; (2) a subnetwork labeled PL, including links only between nodes from Puerto Libertad; (3) a subnetwork labeled All, including all the nodes and links; and (4) a subnetwork labeled BK-PL, excluding the links within each community and considering only the potential ties exclusively between two nodes from different communities. Density represents the probability that any given tie between two random nodes is present.
|Ecological Networks of fish and fishing zones|
|N||Maximum links||Observed links||Density||SD|
|Social Networks of fishers|