Monster Seminar JAM - Effects of an Alien Bivalve on the Hudson River Ecosystem
Dr. Dave L. Strayer, Institute of Ecosystem Studies
The Eurasian bivalve Dreissena polymorpha (zebra mussel) appeared in the Hudson River in 1991, and since 1992 has constituted more than half of consumer biomass in the river. Consequently, biomass of phytoplankton and small zooplankton fell by 80-90%, and populations of many animals that eat plankton have dwindled. Water clarity and concentrations of dissolved nutrients have risen, leading to increased production of littoral plants and animals. These changes extend throughout the food web, from bacteria to fish, and represent one of the most pervasive and severe of human impacts on the Hudson. Recently, we have begun to see hints that some of these impacts may be moderating.
University of Washington
Date and Time:
May 4, 2006,
11:00 am - 12:30 pm