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경남 거제 연안 잘피밭에 출현하는 점망둑 (Chaenogobius annularis ) 치어의 식성

Feeding habits of juvenile Chaenogobius annularis in an eelgrass bed in the coastal water of Geoje, Korea

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초록

2011년 5월에서 6월에 거제 연안에서 RN80으로 채집된 점망둑(Chaenogobius annularis) 치어 281개체의 소환관 내용물 조성을 조사하였다. 점망둑의 척색장은 0.3-1.8 cm의 범위를 보였으며, 요각류 (Copepoda)가 가장 우점한 먹이생물이었다. 요각류 다음으로는 만각류 (Cirripedia) Cypris 유생이 우점하였으며, 그 외 유종섬모충류 (Tintinnids), 단각류 (Amphipoda) 등도 섭식하였으나 그 양은 많지 않았다. 점망둑 치어의 섭식전략과 섭식패턴을 알아보기 위하여 도해적방법을 이용한 결과, 요각류를 가장 선호하였으며, 요각류 중에서도 갈고리노벌레목이 출현빈도와 특정먹이생물우점도에서 가장 높게 나타나 점망둑이 갈고리노벌레목을 선호하는 섭식특화종임을 알 수 있었다. 점망둑은 모든 척색장군에서 요각류를 주로 섭식하였으며, 모든 척색장군에서 요각류 중 갈고리노벌레목이 가장 우점하였다. 또한 점망둑은 성장하면서 먹이생물의 크기가 유의하게 증가하는 양상을 보였다.

Abstract

The feeding habits of juvenile Chaenogobius annularis were examined based on gut content analysis of 281 individuals, collected from May to June 2011 in the coastal water of Geoje, Korea. Copepods were the main source of food for C. annularis, which constituted 61.6% in IRI. Barnacle larvae was the second largest dietary component. Graphical analysis of the diet composition showed that C. annularis was a specialized predator characterized by strong individual feeding specialization. Both small and large size class of C. annularis mainly consumed harpacticoida and cirripedia cypris.

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