Apr 23, 2020

Greater local diversity under older species pools may arise from enhanced competitive equivalence

BioRxiv : the Preprint Server for Biology
Devin R Leopold, T. Fukami

Abstract

Local ecological communities tend to contain more species when they are located within a geologically older region, a pattern that has traditionally been attributed to the accumulation of species in the regional species pool. In this explanation, local species interactions are assumed to play a minor role in the formation of the regional species pool, which is instead thought to be driven by speciation and dispersal occurring across larger areas. Here, we provide evidence suggesting a more important role of local species interactions than generally assumed. In an experiment in which we assembled 320 local communities of root-associated fungi under 80 species pools, we varied the species richness of the experimental species pools and the mean age of the sites from which we collected the fungal species across a 4-myr soil chronosequence in Hawaii. We found that realized local species diversity in the assembled communities increased more extensively with increasing species-pool richness when species were from older sites. We also found that older species pools had lower functional and phylogenetic diversity, indicating that the evolution of greater competitive equivalence among potential colonists enabled higher local diversity un...Continue Reading

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Mentioned in this Paper

Biological Markers
Study
Carcinoma, Neuroendocrine
Genome
Genes
CCDC40 protein, human
Tumor Tissue Sample
Microsatellite Instability
4-guanidinobutyrate
Calcium Signaling

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