Reticulate evolution as a management challenge: Patterns of admixture with phylogenetic distance in endemic fishes of western North America

Evolutionary Applications
Max R BangsMichael E Douglas

Abstract

Admixture in natural populations is a long-standing management challenge, with population genomic approaches offering means for adjudication. We now more clearly understand the permeability of species boundaries and the potential of admixture for promoting adaptive evolution. These issues particularly resonate in western North America, where tectonism and aridity have fragmented and reshuffled rivers over millennia, in turn promoting reticulation among endemic fishes, a situation compounded by anthropogenic habitat modifications and non-native introductions. The melding of historic and contemporary admixture has both confused and stymied management. We underscore this situation with a case study that quantifies basin-wide admixture among a group of native and introduced fishes by employing double-digest restriction site-associated DNA (ddRAD) sequencing. Our approach: (a) quantifies the admixed history of 343 suckers (10 species of Catostomidae) across the Colorado River Basin; (b) gauges admixture within the context of phylogenetic distance and "ecological specialization"; and (c) extrapolates potential drivers of introgression across hybrid crosses that involve endemic as well as invasive species. Our study extends across an ...Continue Reading

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Citations

Jul 21, 2020·Evolutionary Applications·Anne-Laure FerchaudMaren Wellenreuther

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Methods Mentioned

BETA
PCR
scraping
two hybrids

Software Mentioned

R
ddRAD
dnadist
package introgress
pyrad
PHYLIP

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