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ID 39891
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Reconstruction of the migratory history of the catadromous fourspine sculpin Cottus kazika from the Monobe and Shimanto River, Kochi prefecture in southern Shikoku, using otolith Sr/Ca concentration ratios
creator
Okabe, Masaya
Saheki, Akira
Akutagawa, Kenji
Seike, Satoru
subject
カマキリ
降河型回遊型
遡上履歴
耳石Sr/Ca 比
Catadromy; sculpin
Cottus kazika
Migratory timing
Sr/Ca ratio
NDC
Zoology
abstract
カマキリ当歳魚の遡上履歴を推定する目的で,耳石輪紋の日周性ならびに耳石Sr/Ca比と塩分濃度との関係について調べた。その結果,本種の耳石輪紋は日周輪であること,および耳石Sr/Ca比は海水中で顕著に上昇することを確認した。これらの結果をもとに,高知県四万十川および物部川で採集したカマキリ当歳魚の遡上時期を推定したところ,海水から淡水への移行期は,いずれの河川においても3月上旬と推定された。
abstract
The fourspine sculpin (Cottus kazika) is a catadromous member of the family Cottidae that is endemic to Japan. Our objective was to evaluate the utility of using sagittal otolith Sr/Ca concentration ratios to document the movement of juvenile sculpin between the estuarine areas and freshwater of the Shimanto and Monobe Rivers in southern Shikoku. We confirmed the daily periodicity of increment formation and the correlation between the otolith Sr/Ca ratio and ambient salinity at laboratory condition. Otolith profiles suggested that juveniles tended to move from seawater to freshwater at the beginning of March in both river systems.
journal title
Journal of the Graduate School of Biosphere Science, Hiroshima University
volume
Volume 50
start page
33
end page
42
date of issued
2011-12-24
publisher
広島大学大学院生物圏科学研究科
issn
1348-1371
ncid
naid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biosphere Science
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