The most comprehensive synthesis of stream fish community research ever produced. Winner of the CHOICE Outstanding Academic Title of the Choice ACRL Ecologists have long struggled to understand community dynamics. In this groundbreaking book, leading fish ecologists William Matthews and Edie Marsh-Matthews apply long-term studies of stream fish communities to several enduring questions. This critical synthesis reaches to the heart of ecological theory, testing concepts against the four decades of data the authors have collected from numerous warm-water stream fish communities in the central and eastern United States. Stream Fish Community Dynamics draws together the work of a single research team to provide fresh analyses of the short- and long-term dynamics of numerous streams, each with multiple sampling sites. Conducting repeated surveys of fish communities at temporal scales from months to decades, the authors' research findings will fascinate anyone searching for a deeper understanding of community ecology. The study sites covered by this book range from small headwater creeks to large prairie rivers in Oklahoma and from Ozark and Ouachita mountain streams in Arkansas to the upland Roanoke River in Virginia. The book includes • A comparison of all global and local communities with respect to community composition at the species and family level, emergent community properties, and the relationship between those emergent properties and the environments of the study sites • Analyses of traits of individual species that are important to their distribution or success in harsh environments • A review of evidence for the importance of interactions—including competition and predation—in community dynamics of stream fishes • An assessment of disturbance effects in fish community dynamics • New analysis of the short- and long-term dynamics of variation in stream fish communities, illustrating the applicability and importance of the "loose equilibrium concept" • New analyses and comparisons of spatiotemporal variation in community dynamics and beta diversity partitioning • An overview of the effects of fish in ecosystems in the central and eastern United States The book ends with a summary chapter that places the authors' findings in broader contexts and describes how the "loose equilibrium concept"—which may be the most appropriate default assumption for dynamics of stream fishes in the changing climate of the future—applies to many kinds of stream fish communities.

Extreme flow events in the form of major floods and droughts are primary drivers in structuring aquatic habitats and communities. While floods and droughts can directly alter aquatic biota by displacement or by increased mortalities, extreme flow events can have an indirect and prolonged effect on biota by altering habitat complexity, which in turn delays the recovery of the aquatic biota. Interrelationships among extreme flow events, habitat complexity, and fish communities are established in hydrologically variable rivers (run-off dominated). Less known are the interrelationships among stream flow extremes, habitat complexity, and fish communities in hydrologically stable rivers (groundwater dominated). The purpose of this study was to assess how extreme flow events effect habitat complexity and the fish community within two hydrologically stable rivers in Texas (San Marcos and Comal rivers) using a 9-year dataset. Habitats (N = 4,863) within 12 reaches of the rivers were categorized as high, moderate, or low complexity along a depth, vegetation, substrate, and current velocity gradient. Following or during extreme flow events, shifts in habitat complexity were not evident except in low complexity habitats that shifted towards greater complexity during drought. Among a total of 43 fish species and 135,199 individuals observed, densities of surface water fishes (Gambusia), pelagic generalist fishes (Lepomis, Micropterus, Herichthys), pelagic fluvial fishes (Dionda, Notropis, and Astyanax), and benthic fishes (Etheostoma) generally were greater in high and moderate habitat complexity reaches than in lower habitat complexity reaches and generally unaffected by extreme flow events with few exceptions. These results indicated that habitat complexity in hydrologically stable rivers support greater densities and diversity of fishes similar to hydrologically variable rivers, but habitat complexity and fish community were more resistant and resilient to extreme flow events in hydrologically stable rivers than in hydrologically variable rivers.