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- Title
Comparison of competitive ability between native and introduced salmonids: evidence from pairwise contests.
- Authors
Koh Hasegawa; Toshiaki Yamamoto; Masashi Murakami; Koji Maekawa
- Abstract
Brown trout, Salmo trutta, and rainbow trout, Oncorhynchus mykiss, have been introduced to freshwaters in Hokkaido, Japan. Today, it is recognized that these introduced salmonids have negative impacts on native salmonids such as white-spotted charr, Salvelinus leucomaenis, and masu salmon, O. masou. In particular, interspecific competition may be an important mechanism that could contribute to the exclusion for native salmonids. In this study, experimental pairwise contests were conducted to compare interference competitive ability between native and introduced salmonids. We demonstrated that brown trout were competitively superior to white-spotted charr and masu salmon whereas rainbow trout were superior to white-spotted charr. We suggest that introduced brown trout negatively impact both white-spotted charr and masu salmon, and introduced rainbow trout negatively impact white-spotted charr.
- Subjects
HOKKAIDO (Japan); JAPAN; SALMONIDAE; BROWN trout; RAINBOW trout; STEELHEAD trout; ONCORHYNCHUS; FRESHWATER fishes
- Publication
Ichthyological Research, 2004, Vol 51, Issue 3, p191
- ISSN
1341-8998
- Publication type
Article
- DOI
10.1007/s10228-004-0214-x