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Title
  • en Annual variation of potential predation impacts on larval and juvenile marbled sole Pseudopleuronectes yokohamae by sand shrimp Crangon uritai in Hakodate Bay, Hokkaido
Creator
    • en NAKAYA, Mitsuhiro
    • en JOH, Mikimasa
    • en NAKAGAMI, Masayasu
    • en TAKAHASHI, Toyomi
Accessrights open access
Rights
  • ja © 2007 公益社団法人日本水産学会
  • en © 2007 The Japanese Society of Fisheries Science
Subject
  • Other en Crangon uritai
  • Other en prey–predator size
  • Other en Pseudopleuronectes yokohamae
  • Other en size selective predation
  • NDC 485.3
Description
  • Abstract en 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.
Publisher en Blackwell
Date
    Issued2007-02
Language
  • eng
Resource Type journal article
Version Type AM
Identifier HDL http://hdl.handle.net/2115/24475
Relation
  • isVersionOf DOI https://doi.org/10.1111/j.1444-2906.2007.01309.x
Journal
    • PISSN 0919-9268
    • EISSN 1444-2906
      • en Fisheries Science
      • Volume Number73 Issue Number1 Page Start112 Page End122
File
Oaidate 2023-07-26