2013년 하계 자란만 서부 연안에서 Cochlodinium polykrikoides 적조의 미발생 원인을 화학적 현장관측결과와 기존에 발표된 C. polykrikoides의 생리학적 자료를 이용하여 해석하였다. 조사기간 동안 식물플랑크톤 군집은 규조류가 우점하고 있었으며, Cerataulina pelagica, Chaetoceros spp., Navicula spp. 그리고 Nitzschia spp.가 주요 우점종으로 출현하였다. 자란만 서부 연안의 영양염 농도는 이전의 C. polykrikoides 적조 발생 시기에 비해서 DIP 농도는 유사하였지만, DIN 농도는 낮았다. 특히, C. polykrikoides는 자란만 서부 연안에서 우점종으로 출현하는 규조류들에 비해서 무기 영양염에 대한 반포화상수(Ks)가 낮아 이들과의 종 경쟁에서 불리한 위치에 있는 것으로 보였다. 또한 상대적으로 낮은 DIN 농도를 보인 자란만 서부 연안은 질소에 대한 의존성이 높은 C. polykrikoides가 증식하기 위해서 불리한 환경이었다. 따라서 자란만 서부 연안의 낮은 영양염 환경하에서 무기 영양염 경쟁에 대해 불리한 위치에 있는 C. polykrikoides는 규조류의 번무에 따라 출현이 억제된 것으로 생각된다.
We investigated cause of non-outbreak of Cochlodinium polykrikoides blooms in the western coast of Jaran Bay during Summer, 2013, by combining chemical field data and physiological data of C. polykrikoides, which had been already published. The predominant species were mainly diatoms, and dominant species was Cerataulina pelagica, Chaetoceros spp., Navicula spp. and Nitzschia spp.. In case of dissolved inorganic nutrients in the western coast of Jaran Bay, dissolved inorganic phosphorus (DIP) was similar to that in previous outbreak period of C. polykrikoides blooms, but dissolved inorganic nitrogen (DIN) was lower. C. polykrikoides might be disadvantageous in competition with diatom species because half-saturation constants (Ks) of C. polykrikoides for inorganic nutrients was lower than those of diatoms. Also, the western coast of Jaran Bay, where DIN concentration is relatively low, was an unfavorable environment for growth of C. polykrikoides characterized by nitrogen dependence. Therefore, C. polykrikoides which have the disadvantageous position for competition of inorganic nutrient might have been suppressed by diatom blooms under environment of low nutrient in the western coast of Jaran Bay.
식물플랑크톤 군집에 영향을 주는 환경요인은 수온, 염분, 조도, 영양염 그리고 미량금속 그리고 수괴의 안정도와 같은 물리·화학적 요인과 포식자의 포식압과 같은 생물학적 요인을 들 수 있다. 그 중에서 영양염은 식물플랑크톤의 성장은 물론 종간 경쟁과 공존 및 종 천이에 깊게 관여 하며, 대발생을 유발하는 중요한 요인이 된다(Tilman et al., 1982).
흡수한 영양염을 바로 이용하는 성장전략(growth strategy) 그리고 높은 세포 내 저장능력을 바탕으로 흡수한 영양염을 세포 내에 축적하는 저장전략(storage strategy)으로 구분하였다. 특히, 영양염에 대한 반포화상수(Ks)가 낮은 종은 성장전략에 해당되며, 세포 내 영양염 함유량이 높은 종은 저장전략에 따라 생존하게 된다. 따라서 식물플랑크톤의 영양염에 대한 생존전략의 차이는 영양염 환경에 따라 우점할 수 있는 종이 달라 질 수 있는 것을 의미한다.
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2013년 하계 자란만 서부 연안의 Cochlodinium 적조 미발생 원인 : 영양염 자료를 중심으로
海洋環境安全學會誌 = Journal of the Korean society of marine environment & safety
v.20 no.4 = no.63
, 2014년, pp.372 - 381
(부경대학교 해양과학공동연구소 )
( 부경대학교 해양학과 )
( 부경대학교 해양학과 )
( 부경대학교 해양학과)