34 resultados para Infusoria


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Ration of mass species of infusoria and their consumption of phytoplankton in the 0-200 m layer of antarctic and subantarctic waters of the Pacific Ocean are evaluated from microscopic study of digestive vacuoles and counts of algae present in them. In antarctic waters tintinnids, which make up 63-75% of total biomass of infusoria, consumed 19-27% of biomass of nannophytoplankton or 0.1-0.3% of biomass of all phytoplankton. In Subantarctic the main infusorial consumers of phytoplankton were large strombidia, which were dominant in infusorial biomass and in their areas of maximum development consumed 14% of biomass of nannophytoplankton, equivalent to about 10% of total biomass of phytoplankton in the 0-200 m layer.

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The number of cysts of marine planktic infusoria was determined in oligotrophic waters of the central Indian Ocean and productive waters of the Southeast Pacific. Cyst biomass at stations studied varied from 1.2 to 23.4 ?g/l, which was 9.9-115.8% of free infusoria biomass in the 0-15 m layer in the Indian Ocean and 0.3-19.3% in the Southeast Pacific.

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Biomass and size structure of planktic infusoria communities were investigated in March 1987 at nine stations on a 370 mile transect across the coastal upwelling zone, the California current, and subtropical waters. Infusoria compose up to 71-92% of total biomass of heterotrophic micro- and nannoplankton; their biomass was 0.6-2.0 g/m**2 in the 0-200 m layer. Distinctive characteristics of taxonomic and size structures were of great diversity of microplanktic Stormbilidiwn forms, comparatively low abundance of tintinnids, and high abundance of nannoplanktic infusoria that accounted for 26-54% of biomass.