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本文用在加拿大诺瓦·斯科舍省芬克湾采集到的两只活体偏顶蛤(Modiolus)贝壳上的氧同位素组成重建了过去十年间的底层海水温度记录,它也可作为一种独立的方法来确定贝壳上外生长线的沉积时间。由于对贝壳进行了密集采样(可多至每个贝壳沉积年份取15个样品),贝壳上的δ~(16)O变化反映了芬克湾底层海水的季节性变化。两只贝壳所得的温度剖面符合得很好,说明它们基本上是与真实的环境温度相对应的。本研究证明在海胆疾病爆发时底层海水的温度并没有异常升高,这说明疾病传播的关键因素是带病的生物体,而不是温度。同位素技术也说明了在贝壳外表面上可见的外生长线是年轮性的,它们是在每年冬季最低水温时沉积出来的。
In this paper, the oxygen isotope composition of two live shellfish Modiolus collected in Fink Bay, Nova Scotia, is used to reconstruct the seawater temperature record for the past decade and to serve as an independent Method to determine the deposition time of the shell on the outer growth line. As a result of intensive sampling of shells (up to 15 samples per year of sedimentation), the variation of δ ~ (16) O on the shells reflects the seasonal variation of the bottom water in the Gulf of Fink Bay. The temperature profiles obtained by the two shells are in good agreement, indicating that they correspond essentially to the real ambient temperature. This study demonstrates that there is no abnormal increase in the temperature of the bottom seawater during the echinococcosis outbreak, suggesting that the key factor in the spread of the disease is the diseased organism, not the temperature. Isotope techniques also show that the outer growth lines visible on the shell’s outer surface are annual, deposited at the lowest annual winter water temperature.