ウミウの採餌トリップ長の個体変異が繁殖成績に及ぼす影響  [in Japanese] Individual variation in foraging trip duration in Japanese Cormorants (Phalacrocorax filamentosus) and its effect on breeding success  [in Japanese]

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Author(s)

    • 越智 大介 OCHI Daisuke
    • 北海道大学大学院水産科学院資源生態学研究室 Laboratory of Marine Ecology, Graduate School of Fisheries Science, Hokkaido University
    • 綿貫 豊 WATANUKI Yutaka
    • 北海道大学大学院水産科学院資源生態学研究室 Laboratory of Marine Ecology, Graduate School of Fisheries Science, Hokkaido University

Abstract

海鳥類は,一般に採食域に個体変異が存在し,それに応じて採餌トリップ長にも個体変異がある.採食域の個体変異が繁殖成績に与える影響を検証するために,ウミウ<i>Phalacrocorax filamentosus</i>親個体について異なる採食域に分布する二つの餌タイプ間(表層魚,中・底層魚)で持ち帰った餌量を比較し,帰巣パターンを記載した.その結果,ウミウが持ち帰る餌量には餌タイプ間で差が見られなかった.また,採餌トリップ長には有意な個体変異が見られ,短いトリップを繰り返す個体は長いトリップを繰り返す個体に比べ給餌頻度が多く,結果として高いヒナ巣立ち率を達成できることが明らかとなった.

The relationship between individual variation in foraging trip duration in Japanese Cormorants <i>Phalacrocorax filamentosus</i> and their ability to feed their chicks was examined. The dietary mass of different prey types (epipelagic or epi- and benthic fish) was estimated and compared, and the nest attendance patterns and breeding performance of adult birds were observed. There was no difference in dietary mass of each prey type. The duration of foraging trips varied significantly among individuals, and individuals that conducted repeated short trips had higher provisioning rates than individuals that conducted longer trips. Chicks that received high provisioning rates had a higher proportion fledged. These results suggest that variation in foraging trip duration affects breeding success.

Journal

  • Japanese Journal of Ornithology

    Japanese Journal of Ornithology 57(2), 133-139, 2008-10-31

    The Ornithological Society of Japan

References:  17

Codes

  • NII Article ID (NAID)
    10024928155
  • NII NACSIS-CAT ID (NCID)
    AN10314294
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0913400X
  • NDL Article ID
    9710157
  • NDL Source Classification
    ZR4(科学技術--生物学--動物)
  • NDL Call No.
    Z18-866
  • Data Source
    CJP  NDL  J-STAGE 
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