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Size-dependent growth tactics of a partially migratory fish before migration
| Title: | Size-dependent growth tactics of a partially migratory fish before migration |
| Authors: | Futamura, Ryo Browse this author | | Morita, Kentaro Browse this author →KAKEN DB | | Kanno, Yoichiro Browse this author | | Kumikawa, Shoji Browse this author | | Matsuoka, Yuichi Browse this author | | Okuda, Atsushi Browse this author | | Sugiyama, Hiroshi Browse this author | | Takahashi, Hiroyuki Browse this author | | Uchida, Jiro Browse this author | | Kishida, Osamu Browse this author →KAKEN DB |
| Keywords: | Anadromous fish | | Growth period | | Growth rate | | Life history | | Oncorhynchus masou |
| Issue Date: | 22-Jan-2022 |
| Publisher: | Springer |
| Journal Title: | Oecologia |
| Volume: | 198 |
| Issue: | 2 |
| Start Page: | 371 |
| End Page: | 379 |
| Publisher DOI: | 10.1007/s00442-022-05111-0 |
| Abstract: | In many migratory species, smaller migrants suffer higher mortality rates during the risky migration. To minimize the size-selective mortality, migrants with smaller body sizes would need to accelerate growth rates or delay migration timing to attain a large enough body size prior to migration. To test these predictions, we investigated size-dependent patterns of growth rates and migration timing of juvenile masu salmon (Oncorhynchus masou) before their oceanic migration. We tracked uniquely marked individuals in a study population consisted of oceanic migrants and river-dwelling residents using mark-recapture surveys and PIT-tag antenna-reader system. Data supported our predictions about size-dependent growth rates and migration timing. For approximately 6 months before outmigration (i.e., between the decision of migration and the start of migration), eventual migrants grew more than residents if their initial size was smaller, but such a difference in growth rate diminished for fish with larger initial sizes. In addition, smaller eventual migrants delayed the timing of outmigration compared to larger individuals, to attain a larger body size in the river prior to migration. These results suggest that size-selective mortality during migration has shaped size-dependent patterns of the pre-migration growth in migratory masu salmon. Size-conditional changes in growth rate and duration of pre-migration period may be an adaptive tactic for the migratory animals. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/87777 |
| 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)
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Submitter: 岸田 治
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