Accounting for differences in species frequency distributions when calculating beta diversity in the fossil record
Accounting for differences in species frequency distributions when calculating beta diversity in the fossil record
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DOI：
10.1111/2041-210x.13007
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发表时间：
2018-06-01
影响因子：
6.6
通讯作者：
Froebisch, Joerg
中科院分区：
文献类型：
--
作者：
Brocklehurst, Neil;Day, Michael O.;Froebisch, Joerg
1.β多样性是一个组合内栖息地/地点之间的分类学差异的量度，通常计算为地点之间的一组成对分类学“距离”。由于采样不完整，化石组合的β多样性估计值总是高于真实值。然而，观测距离和真实距离之间的差异将根据相对丰度分布形状的差异而变化很大。使用模拟，它表明，不完全抽样的同质动物群，甚至相对丰度的类群产生较高的β多样性比一个非常少的非常常见的类群。提出了一种新的程序计算β多样性的化石记录，从而观察到的距离进行比较，通过随机restaurant一个同质动物具有相同的丰度分布的距离。这个过程被称为相对绝对校正β多样性。仿真结果表明，该方法优于原始的β多样性估计，即使在该方法的假设被违反时，也能提供更接近真实值的β多样性估计.该方法适用于经验数据集：南非卡鲁超群的二叠纪-三叠纪四足动物。增加provincialism被发现在整个二叠-三叠纪边界的对比未校正的β多样性模式。
1. Beta diversity is a measure of the taxonomic differentiation between habitats/localities within an assemblage, and is normally calculated as a set of pairwise taxonomic "distances" between the localities.2. Due to incomplete sampling, beta diversity estimates for fossil assemblages will always be higher than the true value. However, the difference between the observed and true distances will vary greatly depending on differences in the shape of the relative abundance distribution.3. Using simulations, it is shown that incomplete sampling of a homogenous fauna with more even relative abundances of taxa produces higher beta diversity than one with very few extremely common taxa.4. A new procedure is proposed for calculating beta diversity in the fossil record, whereby the observed distances are compared to the distance obtained by randomly resampling a homogenous fauna with the same abundance distribution. This procedure is named Relative Abundance Corrected beta diversity. Simulations indicate that this method outperforms raw beta diversity estimates, providing beta diversity estimates closer to the true values even when the assumptions of the method are violated.5. This method is applied to an empirical dataset: Permian-Triassic tetrapods from the Karoo Supergroup of South Africa. Increased provincialism is found across the Permian-Triassic boundary in contrast to uncorrected beta diversity patterns.