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Title: 酸素・炭素安定同位体比・Mn/Ca比を用いた石垣島轟川河口付近のハマサンゴの壊死研究
Other Titles: Investigation on coral necrosis in massive Porites colony in the Mouth of Todoroki river, Ishigaki Island, Japan deduced from the δ^<l8>O, δ^<l3>C and Mn/Ca ratios
Authors: 川島, 龍憲1 Browse this author
渡邊, 剛2 Browse this author →KAKEN DB
白井, 厚太朗3 Browse this author
前川, 聡4 Browse this author
島村, 道代5 Browse this author
入野, 智久6 Browse this author →KAKEN DB
佐野, 有司7 Browse this author
Authors(alt): KAWASHIMA, Tatsunori1
WATANABE, Tsuyoshi2
SHIRAI, Kotaro3
MAEKAWA, Satoshi4
IRINO, Tomohisa6
SANO, Yuji7
Keywords: Porites coral
Todoroki river
Oxygen isotopes
Carbon isotopes
Mn/Ca ratio
Issue Date: 30-Mar-2009
Publisher: 日本地球化学会
Journal Title: 地球化学
Volume: 43
Issue: 1
Start Page: 35
End Page: 42
Abstract: Coral reefs are increasingly faced to the crisis of decline and death caused by climate changes and anthropogenic influence. These crises were reported in Shiraho coral reefs, the Ishigaki Island, Southwestern Japan, caused by the red soils runoff through the Todoroki River. In order to evaluate the influence of terrestrial inputs on coral skeletal growth and coral death, we have analyzed oxygen and carbon isotopic ratios, as well as Mn/Ca ratio, of coral Porites, skeleton collected from Shiraho reef. The coral colony used in this study was still alive but partly dead when the samples were recovered in 20th September 2006. Oxygen isotopic profile of necrosis part indicates that the death may have occurred in winter 2005 when a strongly positive peak of Mn/Ca ratio was observed in the same growth layer of living part, suggesting that increased terrestrial input during sugar cane harvest and closed water system during lower tide level in winter are a possible cause of coral necrosis in the Shiraho coral reefs.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邊 剛

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