Relationships of diversity, disparity, and their evolutionary rates in squirrels (Sciuridae)

Evolution; International Journal of Organic Evolution
Miriam L ZelditchDonald L Swiderski

Abstract

Several theories predict that rapidly diversifying clades will also rapidly diverge phenotypically; yet, there are also reasons for suspecting that diversification and divergence might not be correlated. In the widely distributed squirrel clade (Sciuridae), we test for correlations between per lineage speciation rates, species richness, disparity, and a time-invariant measure of disparity that allows for comparing rates when evolutionary modes differ, as they do in squirrels. We find that species richness and speciation rates are not correlated with clade age or with each other. Disparity appears to be positively correlated with clade age because young, rapidly diversifying Nearctic grassland clades are strongly pulled to a single stable optimum but older, slowly diversifying Paleotropical forest clades contain lineages that diverge along multiple ecological and morphological lines. That contrast is likely due to both the environments they inhabit and their phylogenetic community structure. Our results argue against a shared explanation for diversity and disparity in favor of geographically mediated modes of speciation and ecologically mediated modes of phenotypic evolution.

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Citations

Mar 19, 2016·Journal of Mammalogy·Bryan S McLeanJoseph A Cook
Mar 25, 2016·Proceedings. Biological Sciences·Jan MatějůPavel Němec
Mar 5, 2016·Evolution; International Journal of Organic Evolution·Shauna L PriceScott Powell
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Jan 12, 2017·Evolution; International Journal of Organic Evolution·Miriam Leah ZelditchDonald L Swiderski
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Jan 11, 2018·Evolution; International Journal of Organic Evolution·Bryan S McLeanJoseph A Cook
Apr 24, 2018·Evolution; International Journal of Organic Evolution·Dean C Adams, Michael L Collyer
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Mar 19, 2020·Evolution; International Journal of Organic Evolution·Miriam L ZelditchDonald L Swiderski
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Dec 15, 2020·Evolution; International Journal of Organic Evolution·Chris J Law
Sep 23, 2021·G3 : Genes - Genomes - Genetics·Lin KangNancy D Moncrief

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