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LIFE HISTORY OF GAMMARUS MUCRONATUS SAY (AMPHIPODA: GAMMARIDAE) IN WARM TEMPERATE ESTUARINE HABITATS, YORK RIVER, VIRGINIA

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ABSTRACT The life history of the amphipod Gammarus mucronatus was examined in two warm temperate estuarine habitats, a sea-grass (Zostera marina) bed and the macroalgae region (Ulva spp., Enteromorpha spp.) of a fouling community. Amphipod populations were present in the sea-grass habitat during most of the entire year ranging from <50 m―2 in late summer to 1,200 m―2 in June, while the algal habitat was occupied only from late winter to early summer, with maximum abundances as high as 6,800 m―2. Based on laboratory growth experiments, observations on field growth rates, and recognition of cohorts from size-frequency distributions, it is estimated that G. mucronatus is capable of producing approximately 6-9 cohorts per year. Rapid spring and summer growth is accompanied by maturation at smaller size and reduction in brood size, egg size, and development time.

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/content/journals/10.1163/193724086x00730
1986-01-01
2016-08-30

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