Aug 27, 2015

Resurrection of the island rule – human-driven extinctions have obscured a basic evolutionary pattern

BioRxiv : the Preprint Server for Biology
Søren Faurby, Jens-Christian Svenning

Abstract

Islands are or have been occupied by unusual species, such as dwarf proboscideans and giant rodents. The discussion of the classical but controversial “island rule,” which states that mammalian body sizes converge on intermediate sizes on islands, has been stimulated by these unusual species. In this paper, we use an unprecedented global data set of the distributions and the body sizes of mammals and a novel analytical method to analyze body size evolution on islands; the analyses produced strong support for the island rule. Islands have suffered massive human-driven losses of species, and we found that the support for the island rule was substantially stronger when the many late-Quaternary extinct species were also considered (particularly, the tendency for dwarfing in large taxa). In this study, the decisive support generated for the island rule confirmed that evolution is markedly different on islands and that human impact may obscure even fundamental evolutionary patterns.

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Mentioned in this Paper

Study
Size
Patterns
Protein Structure, Quaternary
Smad1 protein, mouse
Species
Analysis
Rodent
Dwarfism
Biological Evolution

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