Flood Disturbance and the Distribution of Riparian Species Diversity^*

* I thank Mike Kirchoff for assistance in preparation of the figures, and three anonymous reviewers for their comments on an initial draft of the manuscript.

Abstract

Biodiversity varies considerably in Southern Californian riparian vegetation. The intermediate disturbance hypothesis posits greatest diversity in settings that are subject to moderate‐intensity disturbance. Flood intensity tends to vary systematically in watersheds, potentially imposing patterns of biodiversity. In two study watersheds, species richness increases with flood severity. Diversity, or heterogeneity, is less predictable: Biodiversity patterns in these watersheds are complicated by atypical patterns of flood severity. Although riparian diversity may be intimately dependent on flood disturbance, the relationship is predictable only with due attention to the physiographic details of individual stream networks.

• biodiversity
• floods
• riparian vegetation
• stream power

Additional information

Notes on contributors

Jacob Bendix

Dr. Bendix is an assistant professor of geography at Syracuse University, Syracuse, New York 13244–1020.