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Mixotrophic feeding of Fragilidium subglobosum (Dinophyceae) on three species of Ceratium: effects of prey concentration, prey species and light intensity
Hansen, P.J.; Nielsen, T.G. (1997). Mixotrophic feeding of Fragilidium subglobosum (Dinophyceae) on three species of Ceratium: effects of prey concentration, prey species and light intensity. Mar. Ecol. Prog. Ser. 147: 187-196
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
    Aquatic organisms > Cultured organisms
    Behaviour > Feeding behaviour > Grazing
    Interspecific relationships > Predation
    Interspecific relationships > Predation > Prey selection
    Light intensity
    Microorganisms
    Yield predictions
    Ceratium furca (Ehrenberg) Claparède & Lachmann, 1859 [WoRMS]; Ceratium fusus (Ehrenberg) Dujardin, 1841 [WoRMS]; Ceratium tripos (O.F.Müller) Nitzsch, 1817 [WoRMS]; Dinophyceae [WoRMS]; Fragilidium subglobosum (Stosch) Loeblich III, 1980 [WoRMS]
    Marien

Auteurs  Top 
  • Hansen, P.J.
  • Nielsen, T.G.

Abstract
    Growth and grazing responses of the mixotrophic dinoflagellate Fragilidium subglobosum were studied as a function of prey concentration, prey species, and light intensity in laboratory cultures. In monospecific (exclusively phototrophic) cultures the growth rate of F. subglobosum was 0.16/d (doubling time 4.3 d) at a light intensity of 45 mu mol photons/m-2/s-1. In cultures supplied with the phototrophic dinoflagellate Ceratium tripos at a similar light intensity, the growth rate of F. subglobosum reached a maximum level of 0.5/d (doubling time 1.4 d) at a prey concentration of ca 10 C. tripos cells/ml. The functional response of F. subglobosum followed a Holling type I functional response. At prey concentrations which resulted in maximum growth rate, growth yield equalled ca 40%. However, at prey concentrations which led to lower growth rates, growth yield exceeded 100%, indicating that food uptake by F. subglobosum stimulated photosynthesis at low prey concentrations. When C. tripos cells were added in excess, growth and ingestion rate of F. subglobosum increased with light intensity within the studied range (9 to 45 mu mol photons/m-2/s-1). Growth rates of F. subglobosum were higher with C. tripos as food than with C. furca and C. fusus.

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