イセエビによるツマジロナガウニのサイズ選択的捕食  [in Japanese] Size-selective predation on the sea urchin <i>Echinometra</i> sp. A by Japanese spiny lobster <i>Panulirus japonicus</i>  [in Japanese]

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Abstract

イセエビ(頭胸甲長 CL:59-93 mm)によるツマジロナガウニ(4 サイズ群:殻径 10-19,20-29,30-39,40-49 mm)の捕食を水槽実験で調べた。被食ウニの最大殻径は CL の増加に伴い増加した。サイズ群別のウニに対する捕食成功率(捕食個数/攻撃回数)は,CL に対して最小サイズ群でほぼ一様に高く(約 75%),最大サイズ群で低く(<11%),また中間の 2 サイズ群で CL の増加に伴い増加した。この結果は,大型(>40 mm)のウニでは大型イセエビでも捕食され難くなることを示唆する。

Size-selective predation by Japanese spiny lobster <i>Panulirus japonicus</i> on the sea urchin <i>Echinometra</i> sp. A was examined in outdoor tanks with a roof using 20 lobsters (carapace length, CL: 59-93 mm) and four size classes (10-19, 20-29, 30-39 and 40-49 mm in test diameter, TD) of sea urchins. High levels of predation were found to occur in the period, at least until 5 days before and again from 3 days after molting. The maximum TD of eaten sea urchins increased with CL. The success rate of predation (ratio of the number of prey eaten to the number of predation attacks) was high (∼75%) for the smallest size class of urchins but low (<11%) for the largest class over the experimental range of CL, and the success rate increased with CL for the intermediate classes, suggesting that large (>40 mm) sea urchins may be less vulnerable to predation even by large (>90 mm) lobsters. Prey remains after lobster predation showed that the tests of large (mostly >30-40 mm TD) sea urchins tended to remain largely intact with an enlarged peristomial opening while entire tests were eaten for smaller urchins.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 82(3), 306-314, 2016

    The Japanese Society of Fisheries Science

Codes

  • NII Article ID (NAID)
    130005156366
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • Article Type
    journal article
  • ISSN
    0021-5392
  • NDL Article ID
    027446013
  • NDL Call No.
    Z18-345
  • Data Source
    NDL  J-STAGE  JASI 
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