American Society of Naturalists

A membership society whose goal is to advance and to diffuse knowledge of organic evolution and other broad biological principles so as to enhance the conceptual unification of the biological sciences.

“A Grinnellian niche perspective on species-area relationships”

Posted on

Jorge Soberon (Dec 2019)

Read the Article (Just Accepted)

The species-area relationship is re-interpreted using fundamental niche positions in niche space: This is a new approach

Ecologists have known for a very long time that there is a positive relationship between the size of a region and the number of species it contains. The relationship is often modeled using a very simple power law, with two parameters, and much work has been done on explaining these from demographic processes. In this work I attempt an alternative explanation, one based on the distribution of fundamental niches in environmental space. When area grows, the size of available environmental space also increases. This in turn means that the fundamental niches (ranges of environmental tolerances) of more species are included in the larger environmental space. Approaching the species-area relationship in this way is novel and illuminating. It shifts the focus from very local ecological processes to broad-scale climatic and biographical processes. Probably both perspectives will be needed for a comprehensive understanding of the problem.


Abstract

In this work, Grinnellian niche theory (a body of theory about geographic distributions of species in terms of non-interacting niche variables) is used to demonstrate that species-area relationships emerge with both size of environmental space and size of geographic area. As environmental space increases, more species' fundamental niches are included, thus increasing the number of species capable of living in the corresponding region. This idea is made operational by proposing a size measure for multidimensional environmental space and approximating fundamental niches with minimum-volume ellipsoids. This framework allows estimating a presence-absence matrix based on the distribution of fundamental niches in environmental space, from which many biodiversity measures can be calculated, such as beta diversity. I establish that Whittaker’s equation for beta diversity is equivalent to MacArthur’s formula relating species numbers and niche breadth; this latter equation provides a mechanism for the species niche-space relationship. I illustrate the theoretical results via exploration of niches of the terrestrial mammals of North America (north of Panama). Each world region has a unique structure of its environmental space, and the position of fundamental niches in niche space is different for different clades; therefore, species-area relationships depend on the clades involved and the region of focus, mostly as a function of MacArthur’s niche beta diversity. Analyzing species-area relationships from the perspective of niche position in environmental space is novel, shifting emphasis from demographic processes to historical, geographic, and climatic factors; moreover, the Grinnellian approach is based on available data and is computationally feasible.