Abstract
Fragmentation of habitats and distance between drainages in the semi-arid Lower Colorado River Basin has contributed to development of disjunct populations of caddisflies in the region. Caddisflies in streams cluster into discrete regional assemblages in the basin with significantly different assemblages. Distances between drainages in Arizona will likely increase genetic drift in disjunct populations of caddisflies and further reduce genetic variability, which may be important in conservation.
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