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RISS 인기검색어
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- 저자 : Brian Palenik (검색결과 4 건)
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유영두,성경아,명금옥,김형섭,정해진,Brian Palenik,이원호 한국조류학회I 2015 ALGAE Vol.30 No.4
We explored phagotrophy of the phototrophic ciliate Mesodinium rubrum on the cyanobacterium Synechococcus. The ingestion and clearance rates of M. rubrum on Synechococcus as a function of prey concentration were measured. In addition, we calculated grazing coefficients by combining the field data on abundance of M. rubrum and co-occurring Synechococcus spp. with laboratory data on ingestion rates. The ingestion rate of M. rubrum on Synechococcus sp. linearly increased with increasing prey concentrations up to approximately 1.9 × 106 cells mL-1, to exhibit sigmoidal saturation at higher concentrations. The maximum ingestion and clearance rates of M. rubrum on Synechococcus were 2.1 cells predator-1 h-1 and 4.2 nL predator-1 h-1, respectively. The calculated grazing coefficients attributable to M. rubrum on cooccurring Synechococcus spp. reached 0.04 day-1. M. rubrum could thus sometimes be an effective protistan grazer of Synechococcus in marine planktonic food webs. M. rubrum might also be able to form recurrent and massive blooms in diverse marine environments supported by the unique and complex mixotrophic arrays including phagotrphy on hetrotrophic bacteria and Synechococcus as well as digestion, kleptoplastidy and karyoklepty after the ingestion of cryptophyte prey.
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Yoo, Yeong Du,Seong, Kyeong Ah,Myung, Geumog,Kim, Hyung Seop,Jeong, Hae Jin,Palenik, Brian,Yih, Wonho The Korean Society of Phycology 2015 ALGAE Vol.30 No.4
We explored phagotrophy of the phototrophic ciliate Mesodinium rubrum on the cyanobacterium Synechococcus. The ingestion and clearance rates of M. rubrum on Synechococcus as a function of prey concentration were measured. In addition, we calculated grazing coefficients by combining the field data on abundance of M. rubrum and co-occurring Synechococcus spp. with laboratory data on ingestion rates. The ingestion rate of M. rubrum on Synechococcus sp. linearly increased with increasing prey concentrations up to approximately 1.9 × 10<sup>6</sup> cells mL<sup>-1</sup>, to exhibit sigmoidal saturation at higher concentrations. The maximum ingestion and clearance rates of M. rubrum on Synechococcus were 2.1 cells predator<sup>-1</sup> h<sup>-1</sup> and 4.2 nL predator<sup>-1</sup> h<sup>-1</sup>, respectively. The calculated grazing coefficients attributable to M. rubrum on cooccurring Synechococcus spp. reached 0.04 day<sup>-1</sup>. M. rubrum could thus sometimes be an effective protistan grazer of Synechococcus in marine planktonic food webs. M. rubrum might also be able to form recurrent and massive blooms in diverse marine environments supported by the unique and complex mixotrophic arrays including phagotrphy on hetrotrophic bacteria and Synechococcus as well as digestion, kleptoplastidy and karyoklepty after the ingestion of cryptophyte prey.
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Yoo, Yeong Du,Seong, Kyeong Ah,Kim, Hyung Seop,Jeong, Hae Jin,Yoon, Eun Young,Park, Jaeyeon,Kim, Jong Im,Shin, Woongghi,Palenik, Brian Elsevier 2018 HARMFUL ALGAE Vol.73 No.-
<P><B>Abstract</B></P> <P>The phototrophic euglenophyte <I>Eutreptiella eupharyngea</I> often causes blooms in the coastal waters of many countries, but its mode of nutrition has not been assessed. This species has previously been considered as exclusively auxotrophic. To explore whether <I>E. eupharyngea</I> is a mixotrophic species, the protoplasm of <I>E. eupharyngea</I> cells were examined using light, epifluorescence, and transmission electron microscopy after eubacteria, the cyanobacterium <I>Synechococcus</I> sp., and diverse algal species were provided as potential prey. Furthermore, the ingestion rates of <I>E. eupharyngea</I> KR on eubacteria or <I>Synechococcus</I> sp. as a function of prey concentration were measured. In addition, grazing by natural populations of euglenophytes on natural populations of eubacteria in Masan Bay was investigated. This study is the first to report that <I>E. eupharyngea</I> is a mixotrophic species. Among the potential prey organisms offered, <I>E. eupharyngea</I> fed only on eubacteria and <I>Synechococcus</I> sp., and the maximum ingestion rates of these two organisms measured in the laboratory were 5.7 and 0.7 cells predator<SUP>−1</SUP> h<SUP>−1</SUP>, respectively. During the field experiments, the maximum ingestion rates and grazing impacts of euglenophytes, including <I>E. eupharyngea</I>, on natural populations of eubacteria were 11.8 cells predator<SUP>−1</SUP> h<SUP>−1</SUP> and 1.228 d<SUP>−1</SUP>, respectively. Therefore, euglenophytes could potentially have a considerable grazing impact on marine bacterial populations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study reported for the first time that <I>E. eupharyngea</I> is a mixotrophic species. </LI> <LI> <I>E. eupharyngea</I> fed on only eubacteria and <I>Synechococcus</I> sp. </LI> <LI> Its maximum ingestion rates on eubacteria were 5.7 cells predator<SUP>−1</SUP> h<SUP>−1</SUP>. </LI> <LI> Maximum grazing coefficient by euglenophytes on eubacteria was 1.228 d<SUP>−1</SUP>. </LI> <LI> Euglenophytes may sometimes have a considerable grazing impact on bacteria. </LI> </UL> </P>
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