Quantifying the deep-sea rock and fossil record bias using coccolithophores
Quantifying the deep-sea rock and fossil record bias using coccolithophores
复制标题
使用颗石藻量化深海岩石和化石记录偏差
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Young
中科院分区：
文献类型：
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作者：
Graeme T. Lloyd;A. Smith;J. Young
摘要 虽然许多研究表明观察到的分类丰富度与各种地质采样测量之间存在相关性，但所有研究都是基于从陆地收集的陆地和海洋沉积物的相同记录。在这里，我们首次分析了深海中岩石和化石记录的变化。我们开发了一个新的数据库，记录了在北大西洋（包括地中海和加勒比海）主要钻探计划中采样的颗石藻物种出现情况。我们的采样代理，即采样的深海地点的数量——也许是迄今为止使用的最直接的采样衡量标准——显示出最近的指数增长。在同一时期，物种丰富度以近似线性的方式增长，但属水平的丰富度显示出最初的急剧增加，然后是缓慢得多的下降。然而，丰富度度量和采样之间的相关性非常强，假设真实多样性恒定的模型可以准确预测大部分观察到的丰富度。我们的结论是，深海化石记录与陆地化石记录一样，存在岩石记录偏差。
Abstract While many studies show a correlation between observed taxonomic richness and various measures of geological sampling, all have been based on the same record of terrestrial and marine sediments collected from the land. Here we present the first analyses of how rock and fossil records vary in the deep-sea. We have developed a novel database of species occurrences of coccolithophores sampled during major drilling programs of the North Atlantic, including the Mediterranean and Caribbean. Our sampling proxy, the number of deep-sea sites sampled – perhaps the most direct measure of sampling used so far – shows an exponential rise towards the Recent. Over the same period species-richness has grown in an approximately linear fashion, but genus-level richness shows a sharp initial increase followed by a much slower decline. However, correlations between both richness measures and sampling are extremely strong and a model assuming true diversity to be constant accurately predicts much of observed richness. We conclude that the deep-sea fossil record, like its land-based counterpart, bears a rock record bias.