Abstract
Flooding on the Devil's River, Texas, caused changes in both physical and biological structure of the river. Habitat types became less distinct and generally more riffle-like. Fish species diversity, evenness and number of species decreased. Higher diversities were expressed nearer the river's terminus, indicating flood-resistance there. Prior to the flood 18 species associations existed; 13 existed after flooding, only three of which were present prior to flooding. Six species dominated both preand post-flood community biomass and maintained the same rank-order dominance in both flood regimes. These (Dionda episcopa, Notropis proserpinus, N. amabilis, Astyanax mexicanus, Notropis venustus and Dionda diaboli) occupied slightly different habitats or utilized different resources of the same habitat in the post-flood regime. All are adapted to a flood-prone environment and may constitute the greatest degree of faunal stability in the ecosystem.
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