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A 60-year isotopic record from a mid-Holocene fossil giant clam (Tridacna gigas) in the Ryukyu Islands: physiological and paleoclimatic implications

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タイトル: A 60-year isotopic record from a mid-Holocene fossil giant clam (Tridacna gigas) in the Ryukyu Islands: physiological and paleoclimatic implications
著者: Watanabe, Tsuyoshi 著作を一覧する
Suzuki, Atsushi 著作を一覧する
Kawahata, Hodaka 著作を一覧する
Kan, Hironobu 著作を一覧する
Ogawa, Shinji 著作を一覧する
キーワード: Tridacna gigas
Oxygen isotope
Carbon isotope
Growth line
Mid-Holocene
発行日: 2004年 9月30日
出版者: Elsevier
誌名: Palaeogeography, Palaeoclimatology, Palaeoecology
巻: 212
号: 3-4
開始ページ: 343
終了ページ: 354
出版社 DOI: 10.1016/j.palaeo.2004.07.001
抄録: We have constructed a 60-year stable isotope record from a 14C-dated fossil giant clam, Tridacna gigas (6216 years BP), at its northernmost latitudinal limit in the geological past, on Kume Island, Central Ryukyu Archipelago, Japan. Stable oxygen (δ18O) and carbon (δ13C) isotopic analyses are combined with observations of growth lines seen on the inner shell layer. Sixty pairs of summer/winter growth lines, which preserve daily growth increments were observed in the inner shell layer. Two growth phases, characterized by a growth curve and isotopic profiles, are clearly recognized throughout the growth history of this specimen. No significant shifts in average values of the two isotopic ratios were detected during its growth history, although the growth rate varied widely from 1 to 15 mm/year over 60 years, including after the onset of sexual maturity. Spectral analysis of the fossil Tridacna δ18O time-series implies that decadal variability observed in the North Pacific Ocean during the past hundred years also existed 6000 years ago. Our study implies that fossil giant clams are one of the best means of inferring isotopic records of annual to decadal climate variations. Giant clams have the advantages of a dense shell, high growth rate, long lifespan, and geographically and geologically broad distributions.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/56414
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 渡邊 剛

 

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