낙동강 하구역에 출현하는 보구치(Pennahia argentata)와 청보리멸(Sillago japonica)의 섭식관계

Feeding Relationship between Co-occurring Silver Croaker (Pennahia argentata) and Japanese Sillago (Sillago japonica) in the Nakdong River Estuary, Korea

  • 허성회 (부경대학교 해양학과) ;
  • 최희찬 (동해수산연구소 자원환경과) ;
  • 박주면 (강릉원주대학교 해양자원육성학과)
  • Huh, Sung-Hoi (Department of Oceanography, Pukyong National University) ;
  • Choi, Hee Chan (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute) ;
  • Park, Joo Myun (Department of Marine Bioscience, Gangneung-Wonju National University)
  • 투고 : 2018.10.01
  • 심사 : 2018.11.12
  • 발행 : 2018.12.31

초록

어류의 생태지위에 관한 정보는 해양생태계에서 공존하는 다른 어종이 왜 동시에 높은 현존량을 나타낼 수 있는지를 설명할 수 있게 한다. 본 연구는 낙동강 하구역에 출현하는 보구치와 청보리멸의 위내용물을 분석하여 어종간 또는 각 어종의 체장군간 어떤 섭식관계가 있는지 연구하였다. 두 어종은 저서섭식육식성 어종으로 저서성 갑각류와 연체동물을 주로 섭식하였고, 갯지렁이류 또한 청보리멸에 의해 많이 섭식되었다. 먹이분류군의 중량비를 이용한 nMDS 그래프와 다변량분석은 두 어종의 위내용물이 뚜렷이 차이가 남을 보여줬다. 즉, 두 어종을 먹이를 분할하여 섭식함을 나타냈다. 체장군별 위내용물 조성은 보구치에서 유의한 차이를 보였으나, 청보리멸은 이러한 차이를 보이지 않았다. CAP 분석은 다른 종류의 먹이생물이 두 어종의 위내용물을 구분하는데 기여하였고, 종간 위내용물 조성에서 차이가 나타남을 보여줬다. 결론적으로, 두 어종의 위내용물 분석 결과는 낙동강 하구역에서 동시에 출현하는 보구치와 청보리멸 사이에 생태지위 분리의 증거와 먹이 자원에 대한 종간 경쟁 감소의 가능성을 보여주었다.

Dietary niches can support the coexistence of sympatric species in marine ecosystems, which can lead to the presence of greater abundances of those species. Stomach contents of silver croaker (Pennahia argentata) and Japanese sillago (Sillago japonica) inhabiting the Nakdong River estuary, Korea were analyzed to determine diet compositions and the presence of any size-related and inter-specific feeding relationships. These species were bottom-feeding predators that consumed mainly benthic crustaceans and mollusks, but polychaetes were also important in the S. japonica diets. Non-metric multidimensional scaling (nMDS) ordination and multivariate analyses based on weight contributions of the different prey taxa to stomach contents revealed significant inter-specific dietary differences. Size-related change was also significant for P. argentata diets, but not for S. japonica. Canonical analysis of principal coordinate (CAP) ordination plot further demonstrated that differences in the type and range of prey ingested by the two species contributed such an inter-specific difference in the diet compositions. The results from this study provide clear evidence of niche segregation between co-occurring P. argentata and S. japonica in the Nakdong River estuary, which would reduce the likelihood of inter-specific competition for food resources.

키워드

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