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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. https://dx.doi.org/10.3354/meps147187 In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, meer

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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/Kust

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

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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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