骨格の酸素・炭素同位体比にみるサンゴ白化現象の記録  [in Japanese] Skeletal oxygen and carbon isotope records of coral bleaching  [in Japanese]

Access this Article

Search this Article

Author(s)

    • 鈴木 淳 SUZUKI Atsushi
    • 産業技術総合研究所地質情報研究部門 Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)
    • 川幡 穂高 KAWAHATA Hodaka
    • 産業技術総合研究所地質情報研究部門|東北大学大学院理学研究科 Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)|Graduate School of Science, Tohoku University

Abstract

Frequent coral bleaching has been observed in tropical and subtropical seas during the last three decades. These recurrent coral bleaching events may be a response to global warming. The influence of bleaching on the isotopic composition of coral skeletons has been controversial. Some studies reported clear changes associated with bleaching events, while these changes remained less evident in other reports. Since bleaching can result in a substantial decrease in skeletogenesis, a very fine sampling technique would be needed to detect the corresponding isotopic changes in the coral skeleton. We introduce a recent progress achieved by a high-resolution skeletal isotope microprofiling technique. Using this technique, bleached corals from Pandora Reef, Great Barrier Reef and Ishigaki Island, Japan showed a dramatic decrease in skeletogenesis, together with a reduction in the carbon isotopic values, coincident with the worldwide severe bleaching event in 1997/98. Such changes are consistent with the hypothesis that reduced photosynthesis acts to decrease the carbon isotopic values of the skeleton. However, the drastic reduction in growth would lead to an increase in carbon isotope ratios and may have resulted in subduing the <sup>13</sup>C-response to bleaching. The results indicate that isotopic microprofiling may be the key to identifying gaps in coral growth that are diagnositic of past bleaching events.

Journal

  • Chikyukagaku

    Chikyukagaku 38(4), 265-280, 2004

    The Geochemical Society of Japan

References:  48

Cited by:  1

Codes

  • NII Article ID (NAID)
    110008680084
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    7212998
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
Page Top