A relationship between species richness and evenness that depends on specific relative abundance distribution.
A relationship between species richness and evenness that depends on specific relative abundance distribution.
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物种丰富度和均匀度之间的关系取决于特定的相对丰度分布
作者：
Su Q
尽管许多生态学家关注物种丰富度(S)和均匀度(E)之间的关系，但观测和理论之间的冲突很难调和。S与E之间的经验关系并不一致，而S与E之间的关系表现出很强的相关性。由于E本质上取决于相对丰度分布，因此本文的假设是S与E的关系应由相对丰度分布来确定。各种RAD的理论S-E关系已经报道过了，但很少用原始数据来评估。本研究构建了特定RAD的S-E关系，表明如果群落具有等级丰度的分形分布，E将随着S的增加而减小，并且S-E关系对于给定的RAD是唯一的。这一理论预期得到了包含82个样本的3个数据集的支持，这表明S-E关系受控于RAD，而统计分析中不一致的S-E关系可以用群落间RAD模型的差异来解释。从RAD的角度来看，在统计分析中仅根据S-E的关系将多样性划分为S和E可能还为时过早。
Although many ecologists focus on the relationship between species richness (S) and evenness (E), conflicts between observation and theory are difficult to reconcile. Empirical S–E relationships were not consistent, while relationships show strong correlation between S and E. Since E essentially depended on the relative abundance distribution (RAD), the hypothesis of this paper was that the S–E relationship should be determined by RAD. Theoretical S–E relationships for various RADs have already been reported, but they were rarely assessed by the raw data. This study constructed S–E relationships for a specific RAD, which indicated that if the community had a fractal distribution of rank abundance, E would decrease with S, and the S–E relationship would be unique for a given RAD. Such theoretical expectations were supported by three datasets with 82 samples, which suggested that the S–E relationship were controlled by RAD and inconsistent S–E relationships in statistical analyses could be accounted for by the variation of underlying RAD model between communities. From the perspective of RAD, it could be too early to split the diversity into S and E only based on the S–E relationship in statistical analyses.
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