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Andrew Todd

Photo of Andrew Todd. Title: Research Biologist, Mendenhall Postdoctoral Fellow
Address: Box 25046 MS 964 Denver Federal Center, Denver, CO 80225-0046
Phone: 303-236-1426
Fax: 303-236-3200
Email: atodd@usgs.gov

Education/Training

Ph.D.	University of Colorado, Boulder, CO, 2005 Graduate Degree Program in Civil Engineering: Environmental Engineering Thesis Title: Mining Legacies in the Snake River: The Interaction of Biogeochemistry, Stream Ecology, and Human Use
M.S.	University of Colorado, Boulder, CO, 2001 Graduate Degree Program in Civil Engineering: Environmental Engineering
B.A.	Williams College, Williamstown, MA, 1997 Undergraduate Degree in Biology

Areas of Expertise/Research Interests

My primary expertise and research interests surround the issue of trace metal toxicity to fish, particularly salmonids. My current research involves examining the kinetics of short-term aqueous zinc uptake at the gill surface under different water chemistries, and how that uptake is related to, and predictive of, acute toxicity. As part of this research, I conduct traditional laboratory toxicity testing in conjunction with stable-metal isotope analytical techniques to advance our quantitative understanding of these trace-metal pathways. Further, I am experienced using relevant field techniques (e.g. electrofishing), laboratory techniques (e.g. microwave-assisted digestion), and metal toxicity models (e.g. Biotic Ligand Model).

Other professional interests include evaluating the potential impacts of climate change on the distribution of several rare and threatened salmonid species across the western United States, including sub-species of cutthroat trout, bull trout, and arctic grayling. For several years, I worked collaboratively with the Colorado Water Quality Control Division, the Colorado Division of Wildlife, and other stakeholders to thoroughly research the thermal thresholds influencing Colorado's resident fish, and to ultimately establish robust, scientifically meaningful water temperature standards for trout in Colorado.

Current Research

Mendenhall Postdoctoral Research: Development of Stable-Metal Isotope Techniques to Determine Metal Pathways and Bioavailability to Aquatic Organisms
http://geology.usgs.gov/postdoc/profiles/todd.html

Recent Publications

Todd, A.S., M.A. Coleman, A.M. Konowal, M.K. May, S. Johnson, and N.K.M. Viera. (2008) New Water Temperature Standards to Protect Colorado's Fisheries. Manuscript in review at Fisheries, publication of the American Fisheries Society.
Todd, A.S., McKnight, D.M., Jaros, C.L., and Marchitto, T.M. (2007) Effects of acid rock drainage on stocked rainbow trout (Oncorhynchus mykiss): an in-situ, caged fish experiment. Environmental Monitoring and Assessment 130: 111-127.
Todd, A.S. and Sattelberg, R.M. (2005) Actinides in Deer Tissues at the Rocky Flats Environmental Technology Site. Integrated Environmental Assessment and Management 1(4): 391-396.
Todd, A.S., McKnight, D.M., and Wyatt, L. (2003) Abandoned mines, mountain sports and climate variability: Implications for the tourism economy of Colorado. EOS, Transactions of the American Geophysical Union 84(38):377,386.

Professional Activities and Memberships

Research Affiliate - Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO.
Board of Directors - Rocky Mountain Chapter of the Society of Environmental Toxicology and Chemistry


Mineral Resources	Eastern / Central / Western / Alaska / Minerals Information
Mineral Resources	Crustal Imaging & Characterization / Spatial Data