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논문 상세정보

생물검정실험에 의한 섬진강 하구역 식물플랑크톤 성장의 제한영양염 평가

Limiting Nutrients for Phytoplankton Growth in the Seomjin River Estuary as Determined by Algal Bioassay Experiment

초록

1999년 3월부터 2001년 10월까지 섬진강 하구역에서 영양염의 DIN/DIP 비와 생물검정실험을 이용하여 식물플랑크톤 성장을 제한하는 영양염을 파악$\cdot$비교하였다. 조사기간 동안 용존무기질소와 인산 인의 비는 평균 14.7$\~$681.1의 범위로, 조사시작 지점인 난초도 주변 해역을 제외한 25 psu 이하 염분역과 엽록소 a의 농도가 매우 높았던 구간에서는 계절에 관계없이 N/P 비가 16 이상으로 매우 높아 식물플랑크톤의 성장을 조절하는 제한 영양염은 인산 인인 것으로 판단된다. 반면, 약 25 psu 이상의 염분역인 난초도 주변 해역은 광양만으로부터 공급되는 인산 인의 영향으로 인해 DIN/DIP 비는 16 이하로 낮아, 용존무기질소가 식물플랑크톤의 성장을 제한하는 것으로 판단된다. 섬진강 하구역에서의 DIN/DIP 비의 변화양상은 인산 인의 공급양상, 즉 육상으로부터 의 낮은 공급 및 광양만으로 부터의 높은 공급 그리고 시$\cdot$공간적인 식물플랑크톤의 성장에 의해 주로 영향을 받는 것으로 판단된다. Skeletonema costatum 및 nalassiosira rotula와 현장 식물플랑크톤을 이용한 생물검정실험 결과는 인산 인이 첨가된 배지에서 성장이 상대적으로 높게 나타나, 섬진강 하구역에서 식물플랑크톤을 조절하는 제한영양염은 인산 인인 것으로 검증되었다. S. costatum은 타종에 비해 염분 적응이 빠르고, 인산 인에 대해 반응이 크게 나타나, 섬진강 하구역에서 가을철에 우점율 $90\%$ 이상의 costatum bloom이 발생되는 주요 원인이었을 것으로 추측된다 현장식물플랑크톤을 이용한 생물검정실험에서는 배양시작 초기에 미량금속 첨가계에서 비교적 빠른 성장을 보였으며, 20일 이후에 는 인산 인 첨가계에서 월등한 성장을 보였다. 이는 주변 해수의 영양염 분석과 식물플랑크톤 현존량만으로는 판단하기 어려운, 영양염 이외의 미량금속 그리고 비타민 등의 성장제한 요인에 대한 정보를 얻을 수 있다는 것을 시사해 준다.

Abstract

limiting nutrients for phytoplankton were determined by dissored inorganic nitrogen/phosphorous (DIN/DIP) in situ and algal bioassay experiment in the Seomjin River estuary during a study period from March 1999 to October 2001. DIN/DIP ranged from 14.7 to 681.1 during the study period. DIN/DIP was over 16 at the upper and middle estuarine region where salinity was lower than 25 psu and chlorophyll a concentration was high, probably indicating P-limitation in this region while the ratio was less than 16 at the high saline (> 25 psu) region, reflecting the supply of DIP from Gwangyang Bay and thereby indicating N-limitation at the lower estuarine region. These results suggested that the spatial distribution of DIN/DIP in the study region was controlled by the high supply of phosphate from Gwangyang Bay, the low input from Seomjin River and the active uptake by phytoplankton within the estuarine system. The bioassay experiments using Skeletonema costatum, Thalaasiosira rotula and in situ phytoplankton assemblage displayed relatively higher growth of phytoplankton in the P-added culture media, indicating P-limitation. This result was well consistent with the spatial distribution of inorganic nutrients. S. costatum showed a rapid adaptation to the low salinity compared to other phytoplankton species. This phenomenon seemed to account for the strong (> $90\%$ in total cell number) S. costatum bloom in autumn in this estuary. Moreover, although phytoplankton growth rate was higher in the P-added culture media at the end of culture experiment of in situ phytoplankton, the fast growth in the trace metal-added media at the beginning of the experiment suggested a possibility of limitation by other micro-nutrients such as trace metal and vitamin etc.

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  3. Park, Mi-Ok ; Kim, Seong-Soo ; Kim, Seong-Gil ; Kwon, Jinam ; Lee, Suk-Mo ; Lee, Yong-Woo 2012. "Factors Controlling Temporal-Spatial Variations of Marine Environment in the Seomjin River Estuary Through 25-hour Continuous Monitoring" 한국해양환경공학회지 = Journal of the Korean society for marine environmental engineering, 15(4): 314~322 
  4. Kim, Ha-Kyung ; Kim, Yong-Jae ; Won, Du-Hee ; Hwang, Soon-Jin ; Hwang, Su-Ok ; Kim, Baik-Ho 2013. "Spatial and Temporal Distribution of Epilithic Diatom Communities in Major Harbors of Korean Peninsula" 한국물환경학회지 = Journal of Korean Society on Water Environment, 29(5): 598~609 
  5. Seo, Young Il ; Lee, Jong Hee ; Oh, Taeg Yun ; Lee, Jae Bong ; Choi, Young Min ; Lee, Dong Woo 2013. "Distribution and seasonal variations of fisheries resources captured by the beam trawl in Namhae island, Korea" 한국어업기술학회지 = Journal of the Korean Society of Fisheries Technology, 49(4): 419~431 
  6. Bae, Si Woo ; Kim, Dongseon ; choi, Hyun-Woo ; Kim, Young Ok ; Moon, Chang Ho ; Baek, Seung Ho 2014. "The Influence of Nutrients Addition on Phytoplankton Communities Between Spring and Summer Season in Gwangyang Bay, Korea" 바다 : 한국해양학회지, 19(1): 53~65 
  7. Kang, Sung Hyo ; Lee, Jung Ho ; Park, Sung Wan ; Shin, Hyun Chool 2014. "Temporal and Spatial Distribution of Benthic Polychaetous Communities in Seomjin River Estuary" 바다 : 한국해양학회지, 19(4): 243~255 

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