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Sea-run migratory behaviour in the Japan Sea form of three-spined stickleback Gasterosteus aculeatus in the tidal pool of eastern Hokkaido Island, Japan

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Juveniles in the Japan Sea form of three-spined stickleback Gasterosteus aculeatus collected from a tidal pool in eastern Hokkaido Island, Japan, had a unimodal standard length (LS) frequency distribution in each period, ranging from 11·9 to 31·6 mm, and those of sea-run migrating individuals collected from the outlet of this tidal pool ranged from 17·0 to 36·0 mm, suggesting juveniles of this form would migrate towards the sea when they reached >17·0 mm. In general linear models (GLM) for testing the best model, there was a relationship between the number of sea-run migratory individual and precipitation, which suggests that precipitation may trigger migration.
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Keywords: anadromous; body size; early life history; precipitation; salinity environment

Document Type: Research Article

Affiliations: Biological Laboratory, Gifu-keizai University, 5-50 Kitakata-cho, Ogaki, Gifu 503-8550, Japan

Publication date: 2009-12-01

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