David Richards Senior Research Ecologist drichards@ecoanalysts.com	Tristan Arrington Lead Technician tarrington@ecoanalysts.com

David Richards
Curriculum Vitae
David is currently conducting research on the ecology of the invasive New Zealand mudsnail, Potamopyrgus antipodarum, and its ecological effects on the Snake River. He is also conducting research into the ecology and meta-population viability analysis of several threatened and endangered mollusks in the Snake River. He earned his Ph.D. in Ecology and has a M.S. degree in Entomology with emphasis in aquatic invertebrates, both from Montana State University. His M.S. thesis was "The use of aquatic invertebrates as indicators of water quality in mountain streams of Montana." He has over 20 years experience in a wide variety of resource management positions including fisheries and aquatic ecology positions throughout the middle and northern Rockies and southeast Alaska. In 1999, David started and now manages our EcoAnalysts Inc. Research Lab, in Bozeman, MT. His favorite research involves aquatic community ecology of high elevation and wilderness lakes and rivers.

Tristan Arrington
Tristan joined EcoAnalysts in Nov 2005. She holds a Bachelor of Arts degree in Communication from Montana State University – Northern and came to Montana State in Bozeman, to study pre-veterinary courses and enjoy the outdoors. Currently, she is the lead technician in the Bozeman office and Research Lab conducting research on the ecology of the invasive New Zealand mudsnail, Potamopyrgus antipodarum. Tristan is also involved with the ecological research of several threatened and endangered mollusks in the Snake River, including metapopulation viability analysis.