Feeding by Heterotrophic Dinoflagellates and Ciliates on the Free‐living Dinoflagellate Symbiodinium sp. (Clade E). (25th October 2013)

• Record Type: Journal Article
• Authors: Jeong, Hae Jin; Lim, An Suk; Yoo, Yeong Du; Lee, Moo Joon; Lee, Kyung Ha; Jang, Tae Young; Lee, Kitack
• Is Part Of: Journal of eukaryotic microbiology. Volume 61:Number 1(2014:Jan./Feb.)
• Page Start: 27
• Page End: 41
• Publication Date: 2013-10-25
• Subjects: Protista -- Periodicals; Eukaryotic cells -- Periodicals; Microbiology -- Periodicals; 579.05
• DOI: 10.1111/jeu.12083
• Languages: English
• ISSNs: 1066-5234

Abstract

<abstract abstract-type="main" id="jeu12083-abs-0001"> <title>Abstract</title> <p>To investigate heterotrophic protists grazing on <italic>Symbiodinium</italic> sp., we tested whether the common heterotrophic dinoflagellates <italic>Gyrodinium dominans</italic>, <italic> Gyrodinium moestrupii</italic>, <italic> Gyrodinium spirale</italic>, <italic> Oblea rotundata</italic>, <italic> Oxyrrhis marina</italic>, and <italic>Polykrikos kofoidii</italic> and the ciliates <italic>Balanion</italic> sp. and <italic>Parastrombidinopsis</italic> sp. preyed on the free‐living dinoflagellate <italic>Symbiodinium</italic> sp. (clade E). We measured the growth and ingestion rates of <italic>O. marina</italic> and <italic>G. dominans</italic> on <italic>Symbiodinium</italic> sp. as a function of prey concentration. Furthermore, we compared the results to those obtained for other algal prey species. In addition, we measured the growth and ingestion rates of other predators at single prey concentrations at which these rates of <italic>O. marina</italic> and <italic>G. dominans</italic> were saturated. All predators tested in the present study, except <italic>Balanion</italic> sp., preyed on <italic>Symbiodinium</italic> sp. The specific growth rates of <italic>O. marina</italic> and <italic>G. dominans</italic> on <italic>Symbiodinium</italic> sp. increased rapidly with increasing mean prey concentration < ca. 740–815 ng C/ml (7, 400–8, 150 cells/ml), but became saturated at higher concentrations. The maximum growth rates of <italic>O. marina</italic> and <italic>G. dominans</italic> on <italic>Symbiodinium</italic> sp. (0.87 and 0.61/d) were much higher than those of <italic>G. moestrupii</italic> and <italic>P. kofoidii</italic> (0.11 and 0.04/d). <italic>Symbiodinium</italic> sp. did not support positive growth of <italic>G. spirale</italic>, <italic> O. rotundata, </italic> and <italic>Parastrombidinopsis</italic> sp. However, the maximum ingestion rates of <italic>P. kofoidii</italic> and <italic>Parastrombidinopsis</italic> sp. (6.7–10.0 ng C/predator/d) were much higher than those of <italic>O. marina</italic> and <italic>G. dominans</italic> on <italic>Symbiodinium</italic> sp. (1.9–2.1 ng C/predator/d). The results of the present study suggest that <italic>Symbiodinium</italic> sp. may increase or maintain the populations of some predators.</p> </abstract>