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Studies on Some Long Island Sound Littoral Communities of Microorganisms and Their Primary Productivity

Paul R. Burkholder, Arthur Repak and John Sibert
Bulletin of the Torrey Botanical Club
Vol. 92, No. 5 (Sep. - Oct., 1965), pp. 378-402
Published by: Torrey Botanical Society
DOI: 10.2307/2483839
Stable URL: http://www.jstor.org/stable/2483839
Page Count: 25
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Studies on Some Long Island Sound Littoral Communities of Microorganisms and Their Primary Productivity
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Abstract

Samples of micro-algae were collected from intertidal zones of beaches and mud-flats during the summer of 1964 for studies of the organisms and their organic productivity with the carbon 14 method. Dinoflagellates, euglenoids, blue-green algae, and diatoms were often abundant on the mud and sand of polluted estuaries. Euglenoids sometimes attained an abundance of one million per gram of mud, while diatoms reached 13 million, and bacteria 564 million per gram. Ciliated protozoa, copepods and nematodes were numerous in polluted mud flats. The highest number of nematodes was estimated at 70,000 per gram of mud. Chlorophyll a content of the algae communities varied greatly in different locations, ranging for blue-green algae up to 532 mg Chl a per kg of wet mud, for mixtures of flagellates and diatoms up to 542 mg/kg, and for diatom populations varying up to 427 mg/kg of crude wet material. Assimilation numbers at light saturation averaged 0.55 for blue-green algae, 1.75 for diatoms, and 1.83 for mixed populations of flagellates and diatoms. Calculated daily productivity (mg C/m2/day) averaged 4.45 for blue-green algae, 4.05 for diatoms, and 5 03 for mixed flagellates and diatoms.

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