仙台湾ブリの生産に関する群集生態学的研究-I : ブリ群集の食物連鎖

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A series of ecological studies were carried out on the production of amberfish com-munity at a coast in the Sendai Bay. This report discusses the results of the investigation on the feeding relationships in the community of young amberfish, considered as to be situ-ated at the terminal of the grazing food chain. Young amberfish in the 0-age year live by depending for food highly on young anchovy of 4-10cm in body length during the period from June to November, and maintain the highest food niche habitually in the coastal fish community of the Bay. The anchovy eats copepods principally, and some isopods and diatoms too. By arranging the results of the investigation from the view point of the stomach contents of the animals, the production structures of the community have been ellucidated to some extent. Although some members in the food chain that belonged to the young amberfish com-munity alternated with one another, the main food chain relationships, copepods-anchovy-amberfish, are continuously maintained. Furthermore, this main link is similarly observed in the other coasts of the Bay. In one production structure, each species acuqires a definite food niche in accordance with the developmental stage, and two or more species cannot live together on the same food niche in a community. In this way, stability of the production for the terminal species in a community may have been ensured. To make clear the energy flow and the ecological efficiencies in the biological production system, in the first place, it is necessary to determine the food niche exclusively occupied by each species in the food chain.
公益社団法人日本水産学会の論文

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大方昭弘
茨城県水産試験場

仙台湾ブリの生産に関する群集生態学的研究-I : ブリ群集の食物連鎖

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