Monster Seminar JAM - Multiple Responses of Rainbow Trout to Wildfire and Human Influences
Dr. Jason B. Dunham, USGS FRESC Corvallis Research Group
Wildfire is a major force shaping headwater streams in the Boise River basin, located in central Idaho. The prevalence of wildfire in this basin has increased dramatically in the past 20 years. By looking at different types of biological responses, we were able to identify the potential roles that wildfire may play in the dynamics of rainbow trout populations. We compared spatial distributions, abundance, life history characteristics, and genetic characteristics of local populations in relation to wildfire, channel disturbance, and isolation caused by human-constructed fish passage barriers. Our results showed that common indicators (e.g., distribution, abundance) were not informative. However, changes in the life history of rainbow trout showed marked responses. Patterns of genetic variability within populations provided further indications of the relative effects of wildfire versus human impacts (e.g., barriers and hybridization with nonnative trout). Together, this series of studies provides useful perspectives on potential mechanisms explaining the resilience of native fish to wildfire, and the role of wildfire relative to other threats caused by human influences.
Ocean Teaching Building Auditorium (OTB 014)
University of Washington
Date and Time:
March 30, 2006,
11:00 am - 12:30 pm