Table 1. Annual variability in bee abundance (see Methods), from short- and long-term censuses in two tropical (Peru and Panama) and one temperate (California) regions. Bee families identified below are Apidae (AP), Megachilidae (MG), Halictidae (HAL), and Colletidae (COL).

Bees
No. species
Annual variability
No. years
Source
Euglossini (AP)
6
1.77
2
Pearson and Dressler (1985)
Osmia (MG)
1
2.46
2-3
Frankie et al. (1998)
Megachile (MG)
3
2.07
3
Frankie et al. (1998)
Centris (AP)
1
1.77
4
Roubik (1989) and unpublished data
Apis (AP)
1
5.04
10
Roubik and Wolda (2000)
Megalopta (HAL)
2
2.15
17
Roubik and Wolda (2000)
Rhinetula (HAL)
1
3.45
17
Roubik and Wolda (2000)
Centris (AP)
1
4.74
17
Roubik and Wolda (2000)
Meliponini (AP)
10
4.06
17
Roubik and Wolda (2000)
Ptiloglossa (COL)
1
2.45
17
Roubik and Wolda (2000)
Euglossini (AP)
32
1.36
20
Roubik, this study

*Mean absolute change (ratio of higher to lower value) of sequential census counts.