胃油の脂肪酸組成によるオオミズナギドリのロングトリップ中の餌推定  [in Japanese] Prey of Streaked Shearwaters during long foraging trips estimated by fatty acid composition of the stomach oil  [in Japanese]

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Abstract

繁殖地を離れて1週間にもおよぶロングトリップ中にミズナギドリ類は餌の大部分を消化・吸収し,吸収しづらいトリアシルグリセロール(TAG)やワックスエステルを胃油として胃に蓄積する.胃油のもととなる餌生物を特定するため,胃油中のTAGの脂肪酸組成を新潟県粟島で育雛中のオオミズナギドリにおいて分析し,潜在的な餌の脂肪酸組成と比較した.胃油の脂肪酸組成は,カタクチイワシあるいはサンマに似ていたが,他の外洋性の生物を食べた可能性も完全には否定できない.この2種だけを食べたと仮定すると,その比率はオイルベースでカタクチイワシが77%,サンマが24%と推定された.

During long (c. a week) foraging trips from the colony, shearwaters digested and assimilated most of the food they consumed, but accumulated unabsorbed triacylglycerol (TAG) and wax ester as “stomach oil”. To estimate the prey source, the fatty acid composition of TAG in the stomach oil was analysed for Streaked Shearwaters <i>Calonectris leucomelas</i> rearing chicks on Awa Island, Niigata. The fatty acid composition of stomach oil samples most closely resembled those reported for potential prey species such as: Japanese Anchovy <i>Engraulis japonicus</i> and Pacific Saury <i>Cololabis sair</i>, although we could not completely exclude the possibility that other potential pelagic prey species had been taken. The source of the stomach oil was estimated to be 77% anchovy and 24% saury (oil-based mass proportion), assuming that the birds fed on these two species only.

Journal

  • Japanese Journal of Ornithology

    Japanese Journal of Ornithology 61(1), 137-141, 2012-04-20

    The Ornithological Society of Japan

References:  26

Codes

  • NII Article ID (NAID)
    10031164394
  • NII NACSIS-CAT ID (NCID)
    AN10314294
  • Text Lang
    JPN
  • Article Type
    SHO
  • ISSN
    0913400X
  • NDL Article ID
    023770925
  • NDL Call No.
    Z18-866
  • Data Source
    CJP  NDL  J-STAGE 
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