A 7000-year sea-surface temperature record from CA-SRI-147, Santa Rosa Island, California, USA
A 7000-year sea-surface temperature record from CA-SRI-147, Santa Rosa Island, California, USA
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来自美国加利福尼亚州圣罗莎岛 CA-SRI-147 的 7000 年海面温度记录
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. Gregory
中科院分区：
文献类型：
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作者：
J. Robbins;K. Ferguson;R. Gregory
从加州圣罗萨岛南侧考古遗址CA-SRI-147出土的加州贻贝(Mytilus Calfornianus)提供了跨越约7000年的不连续环境记录。早些时候在该遗址发现的一份关于贻贝残骸的报告发现，贻贝壳长度和海表面温度(SST)的变化之间存在微弱的负相关，但生产力之间没有相关性，在生产力低下和SST上升的时期，贻贝大小从出现之前的约5800到5100个历年下降。这项研究使用该地点的氧同位素来直接比较环境变化和动物群组合的变化。近岸环境数据揭示了四个低温区间，每个区间对应于该地点动物群组合的显著变化。第一次发生在距今(加州)6600年前。BP)，并与该地点贻贝壳质量和大小的最大值相吻合。第二个(约5500卡)。BP)发生在贻贝贡献可变和红鲍(Haliotis Rufescens)贡献增加的间隔期间。第三个(约4800卡。BP)发生在平台贻贝的肉重超过加州贻贝的时候，而最后的间隔(约3700卡)。BP)发生在可能的部位间歇期之前。在软体动物同位素数据中没有发现贝壳贡献和大小减少的总体模式，这表明环境变化对短期变异性产生了深远的影响，而人类对关键资源的捕食提供了对近岸生物群的长期主要压力。
California mussels (Mytilus californianus) excavated from archaeological site CA-SRI-147 on the southern side of Santa Rosa Island, California, provided a discontinuous environmental record spanning about 7000 years. An earlier report of the midden remains at this site found a weak inverse correlation between changes in mussel shell length and sea surface temperature (SST), but not productivity, and a decline in mussel size from ~5800 to 5100 calendar years before present during a period of low productivity and increasing SST. This study uses oxygen isotopes from the site to directly compare environmental change to shifts in faunal assemblage. Four intervals of low temperatures are revealed in the nearshore environmental data, each corresponding to a significant change in faunal assemblage at the site. The first occurs c. 6600 calendar years before present (cal. BP) and coincides with the greatest amount of mussel shell mass and size in the site. The second (c. 5500 cal. BP) occurs during an interval of variable mussel contribution and increasing red abalone (Haliotis rufescens) contribution. The third (c. 4800 cal. BP) occurs during a time when platform mussels (Septifer bifurcatus) exceed California mussels in meat weight, while the final interval (c. 3700 cal. BP) occurs prior to a period of probable site hiatus. The overall pattern of decreasing shell contribution and size at the site is not found in the mollusk isotope data, suggesting that environmental change had a profound impact on short-term variability, while human predation of key resources provided the long-term primary stress on nearshore biota.