4.2 Article

Genome size variation and species diversity in salamanders

Journal

JOURNAL OF EVOLUTIONARY BIOLOGY
Volume 32, Issue 3, Pages 278-286

Publisher

WILEY
DOI: 10.1111/jeb.13412

Keywords

body size; C-value; geographic area; species diversity; Urodela

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Salamanders (Urodela) have among the largest vertebrate genomes, ranging in size from 10 to 120 pg. Although changes in genome size often occur randomly and in the absence of selection pressure, nonrandom patterns of genome size variation are evident among specific vertebrate lineages. Several reports suggest a relationship between species richness and genome size, but the exact nature of that relationship remains unclear both within and across different taxonomic groups. Here, we report (a) a negative relationship between haploid genome size (C-value) and species richness at the family taxonomic level in salamander clades; (b) a correlation of C-value and species richness with clade crown age but not with diversification rates; (c) strong associations between C-value and both geographic area and climatic-niche rate. Finally, we report a relationship between C-value diversity and species diversity at both the family- and genus-level clades in urodeles.

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