Strayer, D.L. and L.C. Smith, 2000. Macroinvertebrates of a Rocky Shore in the Freshwater Tidal Hudson River, Institute of Ecosystem Studies.

Reprinted with Permission from Estuaries (2000) 23(3): 359-366

Macroinvertebrates of a Rocky Shore in the Freshwater Tidal Hudson River

Abstract
We studied the macroinvertebrate fauna of a rocky shore in the freshwater tidal Hudson River during 1992-1994, the early years of the zebra mussel (Dreissena polymorpha) invasion. The macroinvertebrate community was numerically dominated by chironomids, nematodes, oligochaetes, gastropods, zebra mussels, and planarian flatworms. The community was a mixture of species typical of stony warm water rivers and lake shores, freshwater generalists, and semiterrestrial species. Overall marroinvertebrate densities were moderate to low (2,800-14,600 m(-2)). Density was a strong function of season and elevation, with consistently low densities in the early spring and in the intertidal zone. This pattern suggests that physical harshness (alternating submergence and desiccation; ice and low temperatures) limits the distribution of invertebrates at this site. Zebra mussels occurred at our study site chiefly below the low tide mark, but only at moderate abundance (usually <1,000 m(-2)). A weak correlation between the densities of zebra mussels and those of other macroinvertebrates nonetheless suggests that the zebra mussel invasion may have affected community structure.

Contact: David Strayer, Institute of Ecosystem Studies, Box AB, Route #44A, Millbrook, NY 12545
Key Words: Zebra_mussel, Population_dynamics, Environmental_impacts
Product Type: Research, Impact
User Type: General