Sea-run migratory behaviour in the Japan Sea form of three-spined stickleback Gasterosteus aculeatus in the tidal pool of eastern Hokkaido Island, Japan.
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 (L(S)) 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.
Kume
M
M
Laboratory of Fish Population Dynamics, Graduate School of Bioresources, Mie University, 1577, Kurimamachiya-cho, Tsu, Mie 514-8507, Japan. m-kume77@pwri.go.jp
Mori
S
S
D025041:Animal Migration; D000818:Animals; D049628:Body Size; D007564:Japan; D016014:Linear Models; D023701:Smegmamorpha / Q000502:physiology*