Demography and dispersal of the zebra mussel (Dreissena polymorpha ) in upstate New York waters
Zebra mussel (Dreissena polymorpha ) collections have been made June through October in the Erie-Barge Canal, the Oswego River, and Oneida Lake in 1990 and 1991. In 1990 veliger densities were highest at the western end of the canal and declined steadily eastward. By early fall adult densities were...
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Veröffentlicht in: | Journal of shellfish research 1992-01, Vol.11 (1), p.223-223 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Zebra mussel (Dreissena polymorpha ) collections have been made June through October in the Erie-Barge Canal, the Oswego River, and Oneida Lake in 1990 and 1991. In 1990 veliger densities were highest at the western end of the canal and declined steadily eastward. By early fall adult densities were observed as far east as Palmyra. Sites with abundant mussels showed a marked decrease in chlorophyll and an increase in water clarity and soluble reactive phosphorus compared to sites with few or no mussels. In May 1991, adult zebra mussels were first observed on native unionid clams in Oneida Lake. Rapid warming of canal waters in spring of 1991 allowed swift growth and early reproduction of adults surviving over winter. Veliger densities of over 70,000 m super(3) occurred in mid-June at Palmyra, with veligers detected at all sites by mid-July. In contrast to 1990, early summer veliger densities in the eastern waters of the Erie Canal were higher than those in western portions. The Erie Canal system is a major vector through which zebra mussels will infest inland waters of New York State. |
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ISSN: | 0730-8000 |