A Ten-Year Study of Meroplankton in North Carolina Estuaries: Amphipods

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Abstract
Occurrence of gammarid and caprellid amphipods in semimonthly nocturnal surface plankton samples taken on flood tide for 10 years at one estuarine station and shorter periods at 11 other stations is summarized on a monthly basis. Fifty-eight species are identified from samples taken during the study but no single station produced this variety. The great diversity of species from stations near the sea is contrasted with the sparse and different fauna of meso-oligohaline waters. Seasonal abundance in samples is summarized for all important species on a station basis. Contrasts in density of 8 species in surface-bottom tows and 33 species in samples taken at alternate lunar phases (new-full) indicate significant behavioral differences. Nocturnal stratification varied with species; about 1/3 showed no apparent abundance in association with lunar phase, another 1/3 showed increase at new, and a final 1/3 at full moon.

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