Spatially-explicit ecological dynamics in streams and rivers

Date Thursday October 13, 2011 at 4:00 PM
Location 23-105 Center for the Health Sciences (CHS)
Speaker Kurt Anderson, Ph.D., Assistant Professor, Department of Biology, UC Riverside
Sponsoring Dept UCLA Biomathematics
Abstract Many organisms disperse in media possessing a net unidirectional flow. The systems these organisms inhabit, exemplified by streams and rivers, are also characterized by a high degree of multi-scale spatial and temporal environmental variability. Most conceptual frameworks describing ecological organization in streams and rivers prominently feature both upstream-downstream linkages and variability that occurs across spatial and temporal scales. I will discuss modeling studies where I have explored how the spatial distribution of organisms results from multi-scale spatial variability in systems with directionally-biased dispersal. I will begin by discussing spatial scales that characterize population responses near equilibrium. Then, I will discuss transient and non-equilibrium dynamics using metrics that are independent of initial conditions – resilience, reactivity, and the amplification envelope – and relate them to the spatial scale of the population perturbation. Current work aims to extend previous themes to branching river networks and the surrounding landscape. I will conclude with implications for conservation of instream populations.
Flyer anderson_kurt_20111013.pdf