Multiple modes in a coral species abundance distribution
Multiple modes in a coral species abundance distribution
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DOI：
10.1111/j.1461-0248.2008.01208.x
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发表时间：
2008-10-01
期刊：
影响因子：
8.8
通讯作者：
Connolly, Sean R.
中科院分区：
文献类型：
--
作者：
Dornelas, Maria;Connolly, Sean R.
物种多度分布是衡量生物多样性和群落结构的重要指标。这些分布受到抽样的影响，而替代的物种丰度模型通常对小样本量做出类似的预测。非常大的样本揭示了稀有物种的相对丰度，从而提供了小样本无法提供的关于物种相对丰度的信息。在这里，我们给出了一个单一地点的40000个珊瑚群落样本的物种丰度分布，比现有的珊瑚局部组合样本多一个数量级以上。在对数尺度上检验时，这种丰度分布是多峰的。四种不同的模型选择程序都表明，潜在群落丰度分布至少有三种模式。结果表明，多种模式不是由不同栖息地偏好的物种混合造成的。然而，空间聚集部分解释了我们的结果。我们检查了已发表的关于物种丰度分布的工作，并建议多模式可能是大样本的一个共同特征。
Species abundance distributions are an important measure of biodiversity and community structure. These distributions are affected by sampling, and alternative species-abundance models often make similar predictions for small sample sizes. Very large samples reveal the relative abundances of rare species, and thus provide information about species relative abundances that small samples cannot. Here, we present the species-abundance distribution for a sample of > 40 000 coral colonies at a single site, exceeding existing samples of coral local assemblages by over an order of magnitude. This abundance distribution is multimodal when examined on a logarithmic scale. Four different model selection procedures all indicate that the underlying community abundance distribution has at least three modes. We show that the multiple modes are not caused by mixtures of species with different habitat preferences. However, spatial aggregation partially explains our results. We inspect published work on species abundance distributions, and suggest that multimodality may be a common feature of large samples.