통영 장평리 잘피밭에 출현하는 복섬(Takifugu niphobles)의 위내용물 조성
Diet composition of grass puffer, Takifugu niphobles in the eelgrass bed of Jangpyeong-ri, Tongyeong
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경상남도 통영시 장평리 잘피밭에 출현하는 복섬 (Takifugu niphobles)의 위내용물을 알아보기 위해 2016년 5월부터 2017년 4월까지 총 587개체를 채집하였다. 복섬은 육식성어류였으며 주로 단각류 (Amphipoda)를 섭식하였다. 단각류 다음으로 중요한 먹이생물은 요각류 (Copepoda)였다. 그 외에 갯지렁이류 (Polychaeta), 곤충류 (Insecta), 게류 (Brachyura) 등을 섭식하였지만 그 양은 많지 않았다. 복섬의 체장범위는 0.7-9.0 cm였으며 전 체장군에서 가장 중요한 먹이생물은 단각류였다. 성장함에 따라 요각류의 점유율은 감소하였으며 갯지렁이류의 점유율은 증가하는 경향을 보였다. 또한 성장함에 따라 평균 먹이생물의 개체수는 유의한 차이를 보이지 않았지만 평균 먹이생물의 부피는 증가하였다. 계절별 먹이생물 변화양상을 살펴본 결과, 모든 계절에 단각류가 가장 중요한 먹이생물이었다. 단각류는 여름에 가장 높은 점유율을 보였으며 가을에 감소하는 경향을 보였다. 단각류 다음으로 중요한 먹이생물인 요각류는 여름에서 봄으로 갈수록 감소하는 경향을 보였다. 또한 갯지렁이류는 가을에 가장 높은 점유율을 보였으며 겨울에 가장 낮은 점유율을 보였다.
Abstract
The diet composition of Takifugu niphobles was studied with 587 specimens collected in the eelgrass bed of Jangpyeong-ri, Tongyeong, Korea, using a seine net, monthly from May 2016 to April 2017. The standard length (SL) of the specimens ranged from 0.7 to 9.0 cm. The stomach contents analysis indicated that T. niphobles consumed mainly amphipods (%IRI: 91.0 %). In addition, T. niphobles fed on small quantities of copepods, polychaetes, insects, bivalves and crabs. T. niphoblesconsumed mainly amphipods over all size class. Smaller individuals (less than 4 cm SL) fed mainly on amphipods and copepods. The proportion of copepods decreased, as body size increased, whereas the consumption of polychaetes increased gradually. The seasonal variation in the diet composition of T. niphobles was significant. Amphipods were most common prey in all seasons. Copepods decreased from summer to spring gradually whereas the consumption of polychaetes increased in autumn.
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