Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Origin and Source Appointment of Sedimentary Organic Matter in Marine Fish Cage Farms Using Carbon and Nitrogen Stable Isotopes

탄소 및 질소 안정동위원소를 활용한 어류 가두리 양식장 내 퇴적 유기물의 기원 및 기여도 평가

  • Young-Shin Go (National Institute of Fisheries Science, Marine Environment Research Division) ;
  • Dae-In Lee (National Institute of Fisheries Science, Marine Environment Research Division) ;
  • Chung Sook Kim (National Institute of Fisheries Science, Marine Environment Research Division) ;
  • Bo-Ram Sim (Fisheries Resources and Environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Hyung Chul Kim (National Institute of Fisheries Science, Research and Development Planning Division) ;
  • Won-Chan Lee (National Institute of Fisheries Science, Marine Environment Research Division) ;
  • Dong-Hun Lee (National Institute of Fisheries Science, Marine Environment Research Division)
  • 고영신 (국립수산과학원 어장환경과) ;
  • 이대인 (국립수산과학원 어장환경과) ;
  • 김청숙 (국립수산과학원 어장환경과) ;
  • 심보람 (서해수산연구소 자원환경과) ;
  • 김형철 (국립수산과학원 연구기획과) ;
  • 이원찬 (국립수산과학원 어장환경과) ;
  • 이동헌 (국립수산과학원 어장환경과)
  • Received : 2021.11.17
  • Accepted : 2021.12.13
  • Published : 2022.06.30
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Abstract

We investigated physicochemical properties and isotopic compositions of organic matter (δ13CTOC and δ 15NTN) in the old fish farming (OFF) site after the cessation of aquaculture farming. Based on this approach, our objective is to determine the organic matter origin and their relative contributions preserved at sediments of fish farming. Temporal and spatial distribution of particulate and sinking organic matter(OFF sites: 2.0 to 3.3 mg L-1 for particulate matter concentration, 18.8 to 246.6 g m-2 day-1 for sinking organic matter rate, control sites: 2.0 to 3.5 mg L-1 for particulate matter concentration, 25.5 to 129.4 g m-2 day-1 for sinking organic matter rate) between both sites showed significant difference along seasonal precipitations. In contrast to variations of δ13CTOC and δ15NTN values at water columns, these isotopic compositions (OFF sites: -21.5‰ to -20.4‰ for δ13 CTOC, 6.0‰ to 7.6‰ for δ15NTN, control sites: -21.6‰ to -21.0‰ for δ13CTOC, 6.6‰ to 8.0‰ for δ15NTN) investigated at sediments have distinctive isotopic patterns(p<0.05) for seawater-derived nitrogen sources, indicating the increased input of aquaculture-derived sources (e.g., fish fecal). With respect to past fish farming activities, representative sources(e.g., fish fecal and algae) between both sites showed significant difference (p<0.05), confirming predominant contribution (55.9±4.6%) of fish fecal within OFF sites. Thus, our results may determine specific controlling factor for sustainable use of fish farming sites by estimating the discriminative contributions of organic matter between both sites.

본 연구에서는 어류 양식장 퇴적 유기물의 기원 및 기여도 평가를 위해 어류(숭어) 가두리 양식장이 이동된 후 수층 및 퇴적물 내 물리/화학적 인자들의 변화와 함께 안정 동위원소 비의 특성을 조사했다. 이를 토대로 과거 양식장 퇴적물 내 축적된 유기물의 거동을 구체적으로 파악함으로써 효과적인 어장환경평가 기법을 검토하였다. 연구정점(OFF 및 control)에서 입자성 및 침강물질은 정점 간 차이보다는 계절적 강수량 변동에 따라 차별적 분포를 보였다. 하지만 퇴적물 내 분석된 δ15N 결과는 수층 기원 질소원과는 유의한 차이를 보였으며, 과거 외부기원의 유기물 (예: 어류 배설물)의 다량 유입이 주된 요인이라 판단된다. 실제로 과거 어류 가두리 양식활동으로 인해 OFF 정점 내 어류 배설물의 우점적 기여(>50%)를 확인할 수 있었다. 따라서 본 연구정점 내 분해되지 않은 어장 양식기인 유기물의 농도가 높은 수준으로 존재할 것이라 판단되며, 어장 회복력의 체계적인 진단을 위한 중요한 고려요인이라 판단된다.

Keywords

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