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DISTRIBUTION AND PRODUCTION OF MICRODEUTOPUS GRYLLOTALPA (AMPHIPODA: AORIDAE) IN A SHALLOW COASTAL LAGOON IN THE BAY OF CADIZ, SPAIN

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ABSTRACT The spatial and temporal fluctuations of density, life cycle, and production of Microdeutopus gryllotalpa in a seminatural lagoon system were studied by taking monthly samples at 3 sites during 1991 and 1992. Its numerical abundance and biomass, which showed considerable spatial and temporal variation, were positively related to the biomass of benthic macroalgae and water salinity (stepwise multiple regression analysis, P < 0.01). Seasonal patterns were similar at all sites, with 2 main annual peaks in early summer and winter. A higher mean growth rate (0.071 mm d-1) was estimated for the warm period (T > 17°C) than for the rest of the year (0.026 mm d-1; T < 17°C). The population studied was multivoltine, with overlapping cohorts and a possible maximum of 5 generations per year. Using the size-frequency method, the mean annual production and production/biomass ratio for the system were estimated to be 22.42 g DW (13.49 g AFDW) m-2 yr-1 and 12.8 (11.7), respectively. These results indicated that in warm temperate lagoons secondary production for species such as M. gryllotalpa may be high, despite its moderate mean biomass.

10.1163/193724095X00460
/content/journals/10.1163/193724095x00460
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/content/journals/10.1163/193724095x00460
2017-10-20

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