Oxygen and carbon stable isotope systematics in Porites coral near its latitudinal limit: The coral response to low-thermal temperature stress
Oxygen and carbon stable isotope systematics in Porites coral near its latitudinal limit: The coral response to low-thermal temperature stress
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DOI：
10.1016/j.gloplacha.2006.01.009
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发表时间：
2006-08
影响因子：
3.9
通讯作者：
T. Omata;A. Suzuki;H. Kawahata;S. Nojima;K. Minoshima;Akiko Hata
中科院分区：
文献类型：
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作者：
T. Omata;A. Suzuki;H. Kawahata;S. Nojima;K. Minoshima;Akiko Hata
我们研究了沿生长轴的氧和碳同位素(分别为δ18O和δ13C)，该珊瑚生活在日本Ushibuka附近的纹状珊瑚北端，那里的冬季温度低于大多数纹状珊瑚所需的最低温度。珊瑚δ~(18)O的季节循环主要取决于海水温度，δ~(18)O与海面温度的回归直线斜率在报告值之内。珊瑚的生长在1968年受到抑制，大约在这个时候，珊瑚的年增长率降低了。这种生长抑制始于1967/1968年冬季，那是一个海水温度极低的时期。从1967/1968年冬季到1969/1970年冬季，δ18O的年波动幅度较小。虽然δ18O和δ13C的波动在大多数年份是异相的，但也有一些年份是同步的。δ~(18)O和δ~(13)C的同相波动表明，动力学同位素效应可能比代谢同位素效应更重要。因此，生物年代学记录揭示了珊瑚对低温胁迫的反应。
We investigated oxygen and carbon isotopes (δ18O and δ13C, respectively) along the growth axis of a Porites coral living near the northern limit of hermatypic corals, off Ushibuka, Japan, where winter temperatures fall below the minimum required by most hermatypic corals. The coral's seasonal δ18O cycle depended mainly on seawater temperature, and the slope of the regression line between δ18O and sea-surface temperature for this coral was within reported values. The coral's growth was inhibited in 1968, and at around this time the annual growth rate was reduced. This growth inhibition began in winter 1967/1968, a period of extraordinarily low seawater temperature. Moreover, the amplitude of the annual δ18O fluctuation was small from winter 1967/1968 to winter 1969/1970. Although δ18O and δ13C fluctuations were out of phase most years, they were in phase some years. The in-phase fluctuations of δ18O and δ13C indicate that kinetic isotope effects may have been more important than metabolic isotope effects during those years. Sclerochronologic records thus reveal the coral response to low-temperature stress.