환경생물 (Korean Journal of Environmental Biology)

  • 제39권1호
  • /
  • Pages.19-31
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  • 2021
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  • 1226-9999(pISSN)
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  • 2287-7851(eISSN)
한국환경생물학회 (Korean Society of Environmental Biology)
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한국의 남해 거문도해역에 자생하는 홍합(Mytilus coruscus)의 수심별 성장, 비만도와 저서생물의 분포

Distribution of benthic organisms and growth and obesity of mussels (Mytilus coruscus) by depth in Geomundo, south coast of Korea

  • 투고 : 2020.10.13
  • 심사 : 2021.02.08
  • 발행 : 2021.03.31
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초록

본 연구는 거문도 해역에 자생하는 홍합의 수심별 분포특성을 파악하고 공존 또는 경쟁하며 생활하는 주변 저서 생물상을 파악하고자 연구를 진행하였다. 홍합은 수심이 낮은 곳에서 밀도가 높고 비만도가 낮은 반면, 수심이 깊어 질수록 밀도가 낮고 비만도가 높아지는 양상을 보이며, 형태적특성도 수심이 깊어질수록 증가하는 양상으로 나타났다. 이는 각장과 전중량의 상관관계식에서도 수심 2m에 비하여 수심 12 m에서 높은 상관관계를 가지는 것으로 확인되어 수심에 따라 각장이나 각고의 성장 및 전중량에 영향을 미치는 것으로 파악되었다. 주변에 서식하는 저서생물 중 해조류는 홍합의 패각을 기질에 부착하여 서식하는 소형생물과 주변환경에 서식하는 대형생물로 구분할 수 있으며, 암반조하대의 서식특성으로 수심이 깊어질수록 광량에 영향을 받아 밀도 및 생체량이 다소 감소하는 경향으로 분석되었다. 저서동물은 팔각따개비가 홍합의 패각과 주변 서식공간에 모두 분포하고, 굴의 경우는 함께 분포는 하고 있다. 그러나 수심 2 m 지점에서 굴이 우세한 지점에서 홍합이 다소 감소하는 경향을 보이며, 홍합이 우점하는 수심이 깊은 지점에서는 굴이 감소하는 경향으로 나타나 두 종 간의 공간경쟁에서 수심에 따른 영향을 보이는 것으로 파악되었다. 그 외 대형 해조류가 번성하는 지역의 경우, 홍합의 군집이 발달하지 않고 있어 대형해조류의 서식 유·무에도 홍합의 생존이 영향을 받는 것으로 추정되었다.

We investigated the distribution characteristics of mussels (Mytilus coruscus) growing in the Geomundo sea area by water depth. The research was also conducted to identify the surrounding benthic organisms. Mussels showed high density and low obesity in low water depths. The lower the density, the higher the obesity level appeared in deeper water. The morphological characteristics also appeared to increase as the water depth deepened. In addition, the shell length and total weight were more strongly correlated at a depth of 12 m than at 2 m. The total weight by the growth of the shell length and shell height was affected by the water depth. The analysis showed that the density and biomass of the algae inhabiting the surroundings decreased somewhat as the water depth increased. In benthic animals, the number of mussels tended to decrease slightly at the point where oysters dominated, at a depth of 2 m. Conversely, the number of oysters tended to decrease in deeper water dominated by mussels. Thus, the spatial competition between oysters and mussels was affected by the water depth. Also, mussels did not appear in areas where large algae flourished, suggesting that the survival of mussels was affected by the presence or absence of large algae.

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