David Buchwalter

Postdoctoral Fellow

B.S. Zoology, 1989. University of Massachusetts
M.S. Toxicology, 1994. Oregon State University
Ph.D. Toxicology, 2002. Oregon State University

buchwalt@usgs.gov

Research Interests
Aquatic insects are widely used to evaluate ecosystem health. As secondarily aquatic organisms, freshwater insects have evolved several interesting strategies for obtaining oxygen and maintaining their salt-water balance. As a result, species differ tremendously with respect to their cellular interface with the surrounding water. My research focuses on these respiratory and osmoregulatory systems as they relate to contaminant uptake from the environment. My PhD work focused on aquatic insect respiratory biology and pesticide accumulation. Currently, I’m exploring aquatic insect osmoregulatory physiology as it relates to heavy metal uptake.

Publications
Buchwalter, D. B., and Luoma, S. N. (2005) Differences in dissolved cadmium and zinc uptake among stream insects: Mechanistic Explanations. Environmental Science and Technology Vol 39, p. 498-504.

Buchwalter, D.B., J. Sahdahl, J.J. Jenkins, and L.R. Curtis. 2004. Roles of uptake, biotransformation, and target site sensitivity in determining the differential toxicity of chlorpyrifos to second to fourth instar Chironomous riparius (Meigen). Aquatic Tox. Vol 66 149–157.

Buchwalter, D.B., J.J. Jenkins, and L.R. Curtis. 2003. Temperature influences on water permeability and chlorpyrifos uptake in aquatic insects with differing respriratory strategies. Environ. Toxicol. Chem. Vol 22 (11) 2806–2812.

Buchwalter, D.B., J.J. Jenkins, and L.R. Curtis. 2002. Respiratory strategy is a major determinant of [3H]-H2O and [14C]-chlorpyrifos accumulation in aquatic insects. Can. J. Fish. Aquat. Sci. 59: 1315-1322.

Buchwalter, D.B., G. Linder, and L.R. Curtis. 1996. Modulation of cupric ion activity by pH and fulvic acid as determinants of toxicity in Xenopus laevis embryos and larvae. Environ. Toxicol. Chem., Vol 15 (4) 568-573.

Bantle, J.A., D.T. Burton, D.A. Dawson, J.N. Dumont, R.A. Finch, D.J. Fort, G. Linder, J.R. Rayburn, D.B. Buchwalter, M.A. Maurice, and S.D. Turley. 1994. Initial Interlaboratory Validation Study of FETAX: Phase I Testing. J. App. Tox. Vol 14(3), 213-223.

Bantle, J.A., D.T. Burton, D.A. Dawson, J.N. Dumont, R.A. Finch, D.J. Fort, G. Linder, D.B. Buchwalter, J.R. Rayburn, and S.D. Turley. 1994. FETAX Interlaboratory Validation Study: Phase II testing. Environ. Toxicol. Chem., Vol 13(10) 1629-1637.