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Annual variation of potential predation impacts on larval and juvenile marbled sole Pseudopleuronectes yokohamae by sand shrimp Crangon uritai in Hakodate Bay, Hokkaido

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Title: Annual variation of potential predation impacts on larval and juvenile marbled sole Pseudopleuronectes yokohamae by sand shrimp Crangon uritai in Hakodate Bay, Hokkaido
Authors: NAKAYA, Mitsuhiro Browse this author
TAKATSU, Tetsuya Browse this author →KAKEN DB
JOH, Mikimasa Browse this author
NAKAGAMI, Masayasu Browse this author
TAKAHASHI, Toyomi Browse this author
Keywords: Crangon uritai
prey–predator size
Pseudopleuronectes yokohamae
size selective predation
Issue Date: Feb-2007
Publisher: Blackwell
Journal Title: Fisheries Science
Volume: 73
Issue: 1
Start Page: 112
End Page: 122
Publisher DOI: 10.1111/j.1444-2906.2007.01309.x
Abstract: An investigation was conducted to evaluate the annual variation in potential predation impact (PPI) on larval and juvenile Pseudopleuronectes yokohamae by Crangon uritai in Hakodate Bay using predator–prey size relationships. Laboratory experiments were designed to estimate the favorable prey size of C. uritai through back-calculation of body length (BL) of P. yokohamae from sagittal otolith diameter observed in the stomachs of C. uritai. The most favorable prey–predator size ratio (BL of P. yokohamae–total length (TL) of C. uritai) class was 0.15–0.19, and ranged from 0.12–0.31. There was a significant positive correlation between the BL increase of P. yokohamae and the bottom water temperature in the field, such that BLs stagnated during the cold year of 1999 from April to June, and increased during the warm year of 2002. In contrast, no significant correlation was found between the TL increase of C. uritai and the bottom water temperature. Moreover, there were no significant differences in the mean TL of C. uritai between months (April–June) or years (1998–2002). Variation of PPI depended on the relationships between the growth rates of P. yokohamae and bottom water temperature. Therefore, the warm year of 2002 resulted in higher potential predation impact (PPI ≥ 20), and it was at least 20 days shorter than that of the cold year of 1999. These results suggest that increased bottom water temperature in the nursery area was one of the most important factors for cumulative predation loss.
Rights: © 2007 公益社団法人日本水産学会
© 2007 The Japanese Society of Fisheries Science
Type: article (author version)
URI: http://hdl.handle.net/2115/24475
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高津 哲也

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