チチブ耳石中元素のPIXE分析による環境塩分履歴の把握 Effect of Water Salinity on the Elemental Composition of Otoliths from Tridentiger obscurus obscurus

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Abstract

耳石の元素組成の変化から魚類の生息環境履歴を捉えるための基礎資料を得ることを目的として, 飼育環境水の塩分濃度の違いがハゼ科魚類のチチブの耳右の元素組成に及ぼす影響を調べた。耳石中元素の分析には, 非破壊分析法であり, 小さな試料からでも, 多元素を同時に高感度で検出できる, 荷電粒子励起X線放射化 (PIXE) 法を使用した。チチブの耳石中より, P, Cl, K, Ca, Mn, Fe, Cu, Zn, Srが検出された。環境水の塩分濃度と耳石のCl, K, Sr濃度およびこれら元素とCaの濃度比の間には正の相関が, 耳石のMnやZnの濃度およびこれら元素とCaの濃度比の間には負の相関が認められた。すなわち, 耳石の当該元素濃度および当該元素とCaの濃度比は, 耳石から魚の生息塩分履歴を予測する際の有効な指標となることが示唆された。

The effect of water salinity on the elemental composition of sagittae (otoliths) taken from male gobid fishes, <I>Tridentiger obscurus obscurus</I>, reared at a constant salinity (freshwater, 50% seawater and 100% seawater) for one month at 20°C, was studied using particle induced X-ray emission (PIXE). Nine elements were detected in the otoliths; Ca, Cl, Sr, K, P, Zn, Mn, Fe and Cu. The PIXE technique was proved to be an effective means for performing multielement analysis in small fish otoliths. The Cl, K and Sr concentrations, and each of their concentration ratios with Ca in the otoliths, were positively proportional to salinity of the fish rearing. The Mn and Zn concentrations, and Mn/Ca and Zn/Ca concentration ratios, were inversely proportional to the respective rearing salinity. No significant changes in Ca, P, Fe and Cu concentrations and P/Ca, Fe/Ca and Cu/Ca concentration ratios in the otoliths were found. These results suggest that it is possible to use the relationship between the elemental composition of otoliths and the environmental salinity as a means of reconstructing the salinity history of migratory fish.

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 51(6), 388-394, 1997-12-01

    The Society of Sea Water Science, Japan

References:  33

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008281352
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    03694550
  • NDL Article ID
    4352216
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山) // ZP8(科学技術--化学・化学工業--無機化学・無機化学工業)
  • NDL Call No.
    Z15-47
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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