Contribution of different functional groups to the diet of major predatory fishes at a seagrass meadow in northeastern Japan
スポンサーリンク
概要
- 論文の詳細を見る
We examined the variation in habitat use and diet of three dominant fish species (Myoxocephalus brandti, Pholidapus dybowskii, and Pholis crassispina) in a seagrass meadow in the Akkeshi-ko estuary in northeastern Japan, where broad and dense Zostera marina beds exist, using a semi-quantitative census of the fishes and analyses of their stomach contents. Differences among the three fish species in the temporal variation in abundance of each age class (mainly 1- and 2-year age classes) indicated that the temporal pattern of utilization of the seagrass meadow were different among them. In the semi-quantitative dietary analysis, two prey categories, i.e., taxonomic group (order and suborder) and functional group, were used to explain the variation in prey composition with size-dependent changes. The six prey functional groups were classified based on the ecological traits of the prey, i.e., trophic level, size, and life type (habitat and behavior). Ontogenetic shifts in prey of the three fish species could be fully explained by a combination of the two prey categories, and not by the use of only-one category (taxonomic or functional group). The pattern of ontogenetic shifts in prey differed among the fish species and size (age) classes. These results indicate that segregation of habitat (seagrass meadow) and prey group (taxonomic and functional group) is performed among the three species, which may contribute to their coexistence in this estuary.
- 2010-01-01
論文 | ランダム
- 1935年インド統治法の制定とインド高等文官たち
- モンタギュー=チェルムスフォード改革の実施とインド高等文官たち
- SSE2000-82 / RCS2000-71 ミリ波広帯域無線アクセスネットワーク装置〜無線部の開発
- モンタギュー=チェルムスフォード改革の策定とインド高等文官たち
- コイル塞栓術--破裂脳動脈瘤に対するコイル塞栓術の現況 (特集 脳卒中診療の最前線) -- (くも膜下出血の治療)