지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
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초록· 키워드
오류제보하기
The marine sand-dwelling dinoflagellate Polykrikos lebourae possesses obvious gold-brown pigmented plastids as well as taeniocyst-nematocyst complex structures. Despite of the presence of the visible plastids, previous attempts to establish this species in culture all failed and thus the unavailability of cultures of this species has posed a major obstacle to further detailed exploration of ecophysiology of the dinoflagellate. Here, we isolated P. lebourae from sandy sediment of an intertidal flat on Korean western coast, successfully established it in culture, and have been maintaining the stock culture over the past 3 years. Using this stock culture, we explored phagotrophy and potential prey resources of P. lebourae, growth and grazing responses of P. lebourae to different prey organisms, the effect of prey concentration on growth and grazing rates and gross growth efficiency (GGE) of P. lebourae when fed three different prey organisms, and the growth kinetics of P. lebourae under different light regimes. P. lebourae captured prey cells using a tow filament and then phagocytized them through the posterior end. The dinoflagellate was capable of ingesting a broad range of prey species varying in size, but not all prey species tested in this study supported its sustained growth. GGE of P. lebourae was extremely high at low prey concentration and moderate or low at high prey concentrations, indicating that P. lebourae grows heterotrophically at high prey concentrations but its growth seems to be more dependent on a certain growth factor or photosynthesis of plastids derived from the prey. In the presence of prey in excess, P. lebourae grew well at moderate light intensity of $40{\mu}mol$ photons $m^{-2}s^{-1}$, but did not grow at dim and high (10 or $120{\mu}mol$ photons $m^{-2}s^{-1}$) light intensities. Our results suggest that the benthic dinoflagellate P. lebourae is an obligate mixotroph, requiring both prey and light for sustained growth and survival.
목차
등록된 정보가 없습니다.
참고문헌 (33)
참고문헌 신청
Balech, E / 1956 / E’tude des dinoflagellés du sable de Roscoff / Rev. Algol 2:29~52
Børsheim, K. Y / 1987 / Cell volume to cell carbon conversion factors for a bacterivorous Monas sp. enriched from seawater / Mar. Ecol. Prog. Ser 36:171~175
Caron, D. A / 1990 / Ecology of marine protozoa / Oxford University Press :283~306
Dragesco, J / 1965 / Étude cytologique de quelques flagellés mésopsammiques / Cah. Biol. Mar 6:83~115
Fawcett, R. C / 2014 / Mixotrophy and loss of phototrophy among geographic isolates of freshwater Esoptrodinium/Bernardinium sp. (Dinophyceae) / J. Phycol 50:55~70
Børsheim, K. Y / 1987 / Cell volume to cell carbon conversion factors for a bacterivorous Monas sp. enriched from seawater / Mar. Ecol. Prog. Ser 36:171~175
Caron, D. A / 1990 / Ecology of marine protozoa / Oxford University Press :283~306
Dragesco, J / 1965 / Étude cytologique de quelques flagellés mésopsammiques / Cah. Biol. Mar 6:83~115
Fawcett, R. C / 2014 / Mixotrophy and loss of phototrophy among geographic isolates of freshwater Esoptrodinium/Bernardinium sp. (Dinophyceae) / J. Phycol 50:55~70
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