Life-history traits are among the most important factors affecting population abundance and genetic diversity of species. Here, we analysed the genetic patterns of two species with different life-history traits to investigate how these biological differences impacted their evolution in the Valdivia River basin, Southern Chile. We analysed mitochondrial DNA (mtDNA) sequences from 225 individuals of and 136 of to compare patterns of genetic diversity, structure and demographic growth across the basin. presented higher genetic diversity and higher genetic structure than . Demographic analyses showed kept a higher population size over time, with a signal of demographic expansion in the last 250 kyr. Whereas , exhibited lower, but constant population size over time. Furthermore, haplotype networks revealed higher lineage diversity in with a tendency to occupy different areas of the basin. Coalescent simulations ruled out that genetic differences between species could be explained by stochastic processes (genetic drift), suggesting species-specific biological differences as responsible for the observed genetic differences. We discuss how differences in life-history traits and past glaciations interact to shape the evolutionary history of the two species.
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| http://dx.doi.org/10.1098/rsos.200632 | DOI Listing |
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