2012年11月
Food habits of introduced brown trout and native masu salmon are influenced by seasonal and locational prey availability
FISHERIES SCIENCE
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- 巻
- 78
- 号
- 6
- 開始ページ
- 1163
- 終了ページ
- 1171
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s12562-012-0554-9
- 出版者・発行元
- SPRINGER JAPAN KK
A knowledge of food habits is important for evaluating interspecific competition and predation between sympatric species. Data on food availability should be combined with data on food habits in this type of survey. Although food availability differs between habitats or seasons, these differences had never been considered in previous studies. We conducted year-round field surveys throughout a stream to compare the food habits of an introduced salmonid, brown trout Salmo trutta, and a native salmonid, masu salmon Oncorhynchus masou. Masu salmon did not constitute a large proportion of the diet of brown trout and vice versa. Thus, predation will likely not affect the population level of either species. The dietary overlap between brown trout and masu salmon varied depending on the presence of Gammaridae and terrestrial invertebrates; i.e., the intensity of interspecific competition for food resources may differ according to food conditions.
- リンク情報
- ID情報
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- DOI : 10.1007/s12562-012-0554-9
- ISSN : 0919-9268
- Web of Science ID : WOS:000310956000002