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Prey size selection, grazing and growth response of the small heterotrophic dinoflagellate Gymnodinium sp. and the ciliate Balanion comatum: a comparative study
Jakobsen, H.H.; Hansen, P.J. (1997). Prey size selection, grazing and growth response of the small heterotrophic dinoflagellate Gymnodinium sp. and the ciliate Balanion comatum: a comparative study. Mar. Ecol. Prog. Ser. 158: 75-86
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, meer
Peer reviewed article  

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Trefwoorden
    Behaviour > Feeding behaviour
    Behaviour > Feeding behaviour > Grazing
    Body size
    Eukaryotes > Animals > Invertebrates > Protozoa > Ciliophora > Ciliates
    Food consumption
    Interspecific relationships > Predation > Prey selection
    Balanion comatum Wulff, 1922 [WoRMS]; Gymnodinium F. Stein, 1878 [WoRMS]
    Marien

Auteurs  Top 
  • Jakobsen, H.H.
  • Hansen, P.J.

Abstract
    Prey selectivity, growth and feeding responses were studied in the ciliate Balanion comatum (17 mu m) and the heterotrophic dinoflagellate Gymnodinium sp. (7 mu m). Almost identical prey size spectra were found for the 2 organisms. Optimum prey size was 8 mu m, while the lower and upper limits of prey capture were similar to 4 and 10 mu m, respectively, Maximum growth and ingestion rates of B. comatum were slightly higher than those of Gymnodinium sp. Threshold prey concentration for growth of B. comatum and Gymnodinium sp. was 11 and 17 mu g C l-1 , respectively. At 15° C, both organisms needed to ingest approx. 1 to 2% h-1 of their cell volume in order to sustain basic metabolic activity. Maximum specific clearance was 2 to 3 times higher for the ciliate compared to the dinoflagellate. Gymnodinium sp. survived for a longer time than B. comatum when deprived of prey organisms. Gymnodinium sp. cells were not ingested by B. comatum, although they were of a size which is optimal for B. comatum.

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