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Long-term variation of macrobenthos in a mesohaline region of Chesapeake Bay

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Abstract

Macrobenthic species abundances and physical/chemical factors known of affect them were measured in a mesohaline region of the Chesapeake Bay from 1971 to 1982. Variation in species abundance due to station differences, seasonal patterns and year-to-year fluctuations in physical/chemical factors were quantified. The major source of variation in abundance of most species was that associated with seasonal recruitment cycles. Spatial variation in abundances of dominant species was small within habitats defined by sediment characteristics. However, abundance variation among sediment types was relatively large. All species showed significant year-to-year fluctuation in abundance, but no species had systematic long-term increases or decreases in abundance during the study period. Macrobenthos populations were persistent over the 11 years within abundance boundaries defined chiefly by fluctuations in salinity and dissolved oxygen concentration. Most species responded to salinity changes, especially those of an extreme nature, with predictable increases or decreases in abundance. Abundances of all species declined rapidly under conditions of low dissolved oxygen concentration (<2 ppm). Macrobenthos with planktonic developmental stages rapidly repopulated the region following periods of population decline. Repopulation by brooding species was slower.

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Holland, A.F. Long-term variation of macrobenthos in a mesohaline region of Chesapeake Bay. Estuaries 8, 93–113 (1985). https://doi.org/10.2307/1351860

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