Effects of the zebra mussel (Dreissena polymorpha) invasion on the macrobenthos of the freshwater tidal Hudson River

Autor:	David L. Strayer, Lane C. Smith, Dean C. Hunter
Rok vydání:	1998
Předmět:	biology Ecology Benthic zone Macrobenthos Phytoplankton Zebra mussel Animal Science and Zoology Bivalvia biology.organism_classification Mollusca Dreissena Ecology Evolution Behavior and Systematics Invasive species
Zdroj:	Canadian Journal of Zoology. 76:419-425
ISSN:	1480-3283 0008-4301
DOI:	10.1139/z97-212
Popis:	To assess the effect of the zebra mussel (Dreissena polymorpha) invasion on benthic animal communities, we monitored the macrozoobenthos at eight sites in the freshwater tidal Hudson River in 1990-1995. Zebra mussels were absent or scarce in the Hudson River before September 1992, but abundant (mean 17 000/m2) on hard substrata in 1993-1995 and responsible for large declines in phytoplankton biomass. All of our monitoring stations had soft sediments, and so had low local densities of zebra mussels (mean 78/m2). Nevertheless, we observed marked changes in the macrozoobenthos at these stations. Sphaeriid clams declined by 67% between 1990-1992 and 1993-1995, but no other group of macrobenthos showed a simple change in density between 1990-1992 and 1993-1995 across all eight monitoring sites. Instead, most taxa showed a strong interaction between zebra mussel impacts and water depth. At deep-water sites, macrozoobenthic density declined by 33% between 1990-1992 and 1993-1995, while at shallow-water sites, density rose by 25%. We suggest that these changes were probably caused by reduced sedimentation of edible particles at deep-water sites combined with increased biomass of macrophytes and attached algae at shallow-water sites.
Databáze:	OpenAIRE
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