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Contribution of different functional groups to the diet of major predatory fishes at a seagrass meadow in northeastern Japan

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Title: Contribution of different functional groups to the diet of major predatory fishes at a seagrass meadow in northeastern Japan
Authors: Yamada, Katsumasa Browse this author
Hori, Masakazu Browse this author
Tanaka, Yoshiyuki Browse this author
Hasegawa, Natsuki Browse this author
Nakaoka, Masahiro Browse this author
Keywords: fish
habitat use
functional group
predator-prey interactions
multicategory logit model
Issue Date: 1-Jan-2010
Publisher: Elsevier
Journal Title: Estuarine, Coastal and Shelf Science
Volume: 86
Issue: 1
Start Page: 71
End Page: 82
Publisher DOI: 10.1016/j.ecss.2009.10.015
Abstract: 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.
Type: article (author version)
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 仲岡 雅裕

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