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Dr. David L. Strayer

Freshwater Ecologist | PhD, 1984, Cornell University

Expertise
Hudson River, invasive species, streams

Dave Strayer is a freshwater ecologist whose current work focuses on measuring the long-term effects of zebra mussels on the Hudson River ecosystem, and understanding the roles of suspension-feeding animals in ecosystems. Strayer also works on broader issues in freshwater conservation ecology and invasion biology.

Species introductions are one of the most important ways by which humans affect the Earth’s ecosystems. Strayer has been involved in much research in this area, particularly regarding the zebra mussel. This tiny bivalve arrived in North America from Europe in the 1980s and has caused hundreds of millions of dollars in economic damage and widespread ecological change.

Water clarity, water chemistry, food webs, and populations of native species, including fish, in the Hudson River all changed after zebra mussels arrived. Now, decades after their first appearance, Strayer and Cary scientists see evidence of fundamental long-term changes in the relationship between the river and the invader. The Cary group has been tracking this changing relationship for almost 30 years, providing one of the longest and most detailed case studies in invasion ecology.

Strayer also works on the ecology and conservation of native pearly mussels, a highly diverse and imperiled group of animals. He wrote Freshwater Mussel Ecology: A Multifactor Approach to Distribution and Abundance.

Zebra mussels and pearly mussels are examples of suspension-feeders – animals that feed by removing tiny particles from the water. These animals can have large, pervasive effects on aquatic ecosystems.  Strayer is currently working to synthesize information and understanding of freshwater suspension-feeders across a wide range of species and ecosystems.

In addition to his scientific publications, Strayer has written several dozen essays for the general public, which are collected in The Lost Snail of the Yangtze and Other Essays.

Bianchi, T. S., G.M. Davis, and David L. Strayer. 1994. “An Apparent Hybrid Zone Between Freshwater Gastropod Species Elimia Livescens and E. Virginica (Gastropoda: Pleuroceridae)”. Am. Malacol. Bull. 11: 73-78.
Strayer, David L. 1994. “Body Size and Abundance of Benthic Animals in Mirror Lake, New Hampshire”. Freshwater Biol. 32: 83-90.
Reid, J. W., and David L. Strayer. 1994. “Diacyclops Dimorphus, a New Species of Copepod from Florida, With Comments on Morphology of Interstitial Cyclopine Cyclopoids”. J. N. Am. Benthol. Soc. 13: 250-65.
Strayer, David L., D.C. Hunter, L. C. Smith, and C.K. Borg. 1994. “Distribution, Abundance, and Roles of Freshwater Clams (Bivalvia, Unionidae) in the Freshwater Tidal Hudson River”. Freshwater Biol. 31: 239-48. http://www.sgnis.org/publicat/papers/fb31_239.pdf.
Strayer, David L., D.R. Nelson, and E.B. O’Donnell. 1994. “Tardigrades from Shallow Groundwaters in Southeastern New York, With the First Record of Thulinia from North America”. Trans. Am. Microsc. Soc. 113: 325-32.
Strayer, David L., and K.J. Jirka. 1994. “Atlas of the Freshwater Pearly Mussels of New York”. Triannu. Unionid Rep.
Strayer, David L. 1994. “Limits to Biological Distributions in Groundwater”. In J. Gibert, D. Danielopol, and J. Stanford (eds.). Groundwater Ecology, 287-310. Academic Press, Inc., San Diego.
Strayer, David L. 1993. “Macrohabitats of Freshwater Mussels (Bivalvia: Unionacea) in Streams of the Northern Atlantic Slope”. J. N. Am. Benthol. Soc. 12: 236-46.
Findlay, Stuart E. G., David L. Strayer, C. Goumbala, and K. Gould. 1993. “Metabolism of Streamwater Dissolved Organic Carbon in the Shallow Hyporheic Zone”. Limnol. Oceanogr. 38: 1493-99.
Strayer, David L., and J. Ralley. 1993. “Microhabitat Use by an Assemblage of Stream-Dwelling Unionaceans (Bivalvia), Including Two Rare Species of Alasmidonta”. J. N. Am. Benthol. Soc. 12: 247-58.

Articles by David Strayer