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Ciliates as a food source for marine planktonic copepods

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Abstract

Copepods of the genusEurytemora, isolated from the Patuxent River, a tributary of Chesapeake Bay, were fed suspensions of the ciliateUronema isolated from the Rhode River, a subestuary of Chesapeake Bay. Grazing by copepods was determined by the decrease in numbers of ciliates, which were monitored by both direct counting and particle size analysis. Results from both methods of analysis showed significant reduction in the numbers ofUronema in the suspension whenEurytemora was present. Survival of copepods with ciliates added as food source was significantly longer than without ciliates. Analysis of field samples collected in the fall showed that ciliates comprised approximately 20% of the total plankton biomass at selected sampling sites. The results of the laboratory and field studies indicate that copepods can feed on ciliates and suggest that, in nature, ciliates may comprise an important source of food for copepods.

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Authors and Affiliations

  1. Department of Zoology, University of Maryland, 20742, College Park, Maryland

    D. C. Brownlee

  2. Center for Environmental and Estuarine Studies, Chesapeake Biological Laboratory, University of Maryland, 20688, Solomons, Maryland

    D. R. Heinle

  3. Freshwater Institute, Winnipeg, Manitoba, Canada

    H. J. Kling

  4. Department of Microbiology, University of Maryland, 20742, College Park, Maryland

    S. G. Berk, D. C. Brownlee, D. R. Heinle, H. J. Kling & R. R. Colwell

Authors
  1. S. G. Berk
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  2. D. C. Brownlee
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  3. D. R. Heinle
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  4. H. J. Kling
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  5. R. R. Colwell
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Berk, S.G., Brownlee, D.C., Heinle, D.R. et al. Ciliates as a food source for marine planktonic copepods. Microb Ecol 4, 27–40 (1977). https://doi.org/10.1007/BF02010427

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