There has been a considerable effort to understand and quantify the spatial distribution of species across different ecosystems. Relative species abundance (RSA), beta diversity and species area relationship (SAR) are among the most used macroecological measures to characterize plants communities in forests. In this article we introduce a simple phenomenological model based on Poisson cluster processes which allows us to exactly link RSA and beta diversity to SAR. The framework is spatially explicit and accounts for the spatial aggregation of conspecific individuals. Under the simplifying assumption of neutral theory, we derive an analytical expression for the SAR which reproduces tri-phasic behavior as sample area increases from local to continental scales, explaining how the tri-phasic behavior can be understood in terms of simple geometric arguments. We also find an expression for the endemic area relationship (EAR) and for the scaling of the RSA.
翻译:在理解和量化不同生态系统物种的空间分布方面作出了相当大的努力,相对物种丰度(RSA)、乙型多样性和物种区域关系(SAR)是用于描述森林植物群落的最常用的宏观生态措施之一,在本条中,我们引入了一种基于Poisson集群过程的简单苯球学模型,使我们能够将RSA和乙型多样性与SAR完全联系起来。这个框架在空间上是明确的,并说明了相连接个人的空间组合。在简化的中性理论假设下,我们为SAR得出了一个分析表达,该合成孔径雷达在样本区域从地方到大陆范围增加时,复制了三面行为,解释了如何用简单的几何参数来理解三面行为。我们还找到了地方关系(EAR)和RSA规模的表达方式。