Fig. 1. Different hypothetical streamlike habitats compared in the modeling exercise (these drawings are not to scale). Each habitat consists of 1600 square cells; all parts of each network are the same width. Drawing (a) represents a linear habitat with no nodes; (b), a simple design with 10 nodes; (c), a complex design with 10 nodes; (d), a simple design with 20 nodes; and (e), a complex design with 20 nodes. Note that the complex 10-node habitat (c) has a different form from that of the complex 20-node habitat (e).