2015 Winter Lecture Series

Restoration of Native Fishes

native fish graphic

by Andrew Todd
USGS Research Biologist

7 PM, Wednesday, April 29, 2015

Room 130 Porter Hall

Adams State University

Native western U.S. trout species are predicted to be adversely affected by climate change and its synergistic influence on other stressors. Rio Grande cutthroat trout (RGCT; Oncorhynchus clarki virginalis) have already lost a significant amount of habitat (89%) owing to the introduction of nonnative salmonids and habitat loss. Currently RGCT are restricted to 117 small (median size: 5.8 km) isolated patches of stream habitat in New Mexico and Colorado. Predicted future changes in climate (i.e., temperature and precipitation) could further threaten these remaining populations that remain at risk of extirpation from interactions with nonnative salmonids (i.e., brook trout, brown trout, and rainbow trout) and stochastic disturbances (i.e., wildfire, debris flow, and drought). From 2010 - 2014, we documented the thermal regime and baseflow conditions in the majority of these habitat patches to assess the current climate vulnerability of the RGCT. This presentation will explore how the results of our research can be used to inform successful RGCT habitat management into an uncertain climatic future.

About the Speaker

Andrew Todd: Professionally, Andrew works as a research biologist for the U.S. Geological Survey, conducting research on the impacts of diverse stressors (e.g. acid-rock drainage, climate change, water extraction) to cold-water rivers and streams. In recent years, he has worked as a contaminants biologist at the Rocky Flats National Wildlife Refuge site, and as the primary project scientist for Trout Unlimited's Colorado Water Project. Andrew received a BA in biology from Williams College, and MS and Ph.D. degrees in environmental engineering from the University of Colorado at Boulder. Andrew is an avid trail runner, fly fisherman, and craft beer enthusiast, and has fused these three passions into a new sport called the Rocky Mountain Flyathlon ( which will be held near Saguache this August.


The Colorado Field Institute is a nonprofit corporation organized in 2005 to promote greater stewardship of the natural and cultural resources within the San Luis Valley. For more information, email This email address is being protected from spambots. You need JavaScript enabled to view it.

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