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Seasonal stream habitat of adult S akhalin taimen, P arahucho perryi , in the B ekanbeushi R iver system, eastern H okkaido, J apan
Author(s) -
Honda Kentaro,
Kagiwada Haruka,
Takahashi Nobuyuki,
Miyashita Kazushi
Publication year - 2012
Publication title -
ecology of freshwater fish
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 55
eISSN - 1600-0633
pISSN - 0906-6691
DOI - 10.1111/j.1600-0633.2012.00585.x
Subject(s) - tributary , upstream and downstream (dna) , habitat , environmental science , downstream (manufacturing) , fish <actinopterygii> , fishery , streams , upstream (networking) , endangered species , ecology , fish migration , hydrology (agriculture) , biology , geography , geology , cartography , geotechnical engineering , computer science , economics , computer network , operations management
Abstract Behavioural tracking of endangered adult S akhalin taimen ( P arahucho perryi ) by acoustic telemetry was conducted in the B ekanbeushi R iver system that flows through eastern H okkaido in 2008–2010. A total of 39 tracked P . perryi showed extensive use of the river system, both upstream and downstream, regardless of the month or year. No tracked adult P . perryi stayed in the ocean for more than 1 day. Some of the fish (20%) dwelled in upstream habitat consistently from spring to autumn, while 40% of individuals showed wide utilisation of the entire upstream and downstream systems. Although 39.4% of tracked fish utilised two or more primary tributaries to the main river, 6.1% used only the main river system. Distinct variability was observed between individuals based on the proportion of time spent in each stream reach (up‐, mid‐, and downstream). A trend was observed in 2008 and 2010 showing that tracked fish moved to the upper stream reaches when water temperatures downstream increased. This trend was not observed in 2009 when the summer water temperature downstream was more than 2 °C below average when compared to 2008 and 2010. Our results suggest that adult P . perryi in the Bekanbeushi River system exhibit high behavioural plasticity, that is, the fish can select habitats based on their own individual requirements. Our results also demonstrate the importance of physical continuity among river reaches both upstream and downstream such that P . perryi does not experience barriers in moving to optimal habitats.

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