{"refrec":{"BRefID":144504,"RR":"<b>Jakobsen, H.H.; Hansen, P.J.</b> (1997). Prey size selection, grazing and growth response of the small heterotrophic dinoflagellate <i>Gymnodinium</i> sp. and the ciliate <i>Balanion comatum</i>: a comparative study. <i>Mar. Ecol. Prog. Ser. 158</i>: 75-86. <a href=\"https://dx.doi.org/10.3354/meps158075\" target=\"_blank\">https://dx.doi.org/10.3354/meps158075</a>","BEntID":137632,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 158</i>: 75-86. <a href=\"https://dx.doi.org/10.3354/meps158075\" target=\"_blank\">https://dx.doi.org/10.3354/meps158075</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Jakobsen, H.H.; Hansen, P.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Jakobsen, H.H.; Hansen, P.J.","Englishabstract":"Prey selectivity, growth and feeding responses were studied in the ciliate Balanion comatum (17 mu m) and the heterotrophic dinoflagellate <i>Gymnodinium</i> 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 <i>B. comatum</i> were slightly higher than those of <i>Gymnodinium</i> sp. Threshold prey concentration for growth of <i>B. comatum</i> and <i>Gymnodinium</i> sp. was 11 and 17 mu g C l<sup>-1</sup> , respectively. At 15° C, both organisms needed to ingest approx. 1 to 2% h<sup>-1</sup> 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. <i>Gymnodinium</i> sp. survived for a longer time than B. comatum when deprived of prey organisms. <i>Gymnodinium</i> sp. cells were not ingested by <i>B. comatum</i>, although they were of a size which is optimal for <i>B. comatum</i>.   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