In the past, the work has emphasized the use of a mixture of quantitative descriptive studies in natural streams and controlled experimental manipulations in both natural and artificial stream systems. Using these complementary approaches, we have assessed the individual and interactive effects of flow regime, predation, and juvenile fish density and composition on invertebrate resources and the growth and survival of juvenile cyprinid and centrarchid fish. More recently, we have begun a study that attempts to interface ecological and population genetic approaches to investigate how genetics and environmental parameters interact to influence fish in spatially complex environments influenced by beaver activity. In addition to answering fundamental questions regarding the relative importance of abiotic and biotic factors in determining the abundance of fish, this research will enhance our ability to predict the impact of human-induced environmental modifications on these resources. A landscape perspective.
Critical landscape attributes that influence fish population dynamics in headwater streams.
Dispersal, boundary processes, and trophic level interactions in streams adjacent to beaver ponds. Fish recruitment, dispersal, and trophic interactions in a heterogeneous lotic environment. Niche relationships of clonal and sexual fish in a heterogeneous landscape.