| Feeding by the Newly Described, Nematocyst-Bearing Heterotrophic Dinoflagellate Gyrodiniellum shiwhaense. | |
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MedLine Citation:
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PMID: 21895842 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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ABSTRACT. We explored the feeding ecology of the newly described, nematocyst-bearing heterotrophic dinoflagellate Gyrodiniellum shiwhaense (GenBank accession number=FR720082). Using several different types of microscopes and high-resolution video-microscopy, we investigated feeding behavior and types of prey species that G. shiwhaense feeds upon. Additionally, we measured its growth and ingestion rates on its optimal algal prey, the cryptophyte Teleaulax sp. and the dinoflagellate Amphidinium carterae, as a function of prey concentration. These rates were measured for other edible prey at single prey concentrations at which the growth and ingestion rates of G. shiwhaense were saturated. After anchoring the prey with a tow filament, G. shiwhaense fed using a peduncle, ingesting small algal species with equivalent spherical diameters (ESDs) of <13 μm. However, it did not feed on larger algal species that had ESDs≥13 μm or the small diatom Skeletonema costatum. The specific growth rates for G. shiwhaense feeding upon Teleaulax sp. and A. carterae increased rapidly with increasing mean prey concentration before saturating at concentrations of ca. 180-430 ng C/ml. The maximum specific growth rate of G. shiwhaense on Teleaulax sp. and A. carterae were 1.05 and 0.82/d, respectively. However, Heterosigma akashiwo did not support positive growth of G. shiwhaense. The maximum ingestion rates of G. shiwhaense on Teleaulax sp. and A. carterae were 0.35 and 0.54 ng C/grazer/d, respectively. The calculated grazing coefficients attributable to G. shiwhaense on co-occurring cryptophytes and Amphidinium spp. were 0.01-1.87/d and 0.08-2.60/d, respectively. Our results suggest that G. shiwhaense can have a considerable grazing impact on algal populations. |
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Authors:
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Hae Jin Jeong; Kyung Ha Lee; Yeong DU Yoo; Nam Seon Kang; Kitack Lee |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-2 |
Journal Detail:
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Title: The Journal of eukaryotic microbiology Volume: - ISSN: 1550-7408 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-9-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9306405 Medline TA: J Eukaryot Microbiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© 2011 The Author(s). Journal of Eukaryotic Microbiology © 2011 International Society of Protistologists. |
Affiliation:
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School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, Republic of Korea Pohang University of Science and Technology, School of Environmental Science and Engineering, Pohang, 790-784, Republic of Korea. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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