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Secondary contacts and genetic admixture shape colonization by an amphiatlantic epibenthic invertebrate

Journal article
Authors J. Hudson
Kerstin Johannesson
C. D. McQuaid
M. Rius
Published in Evolutionary Applications
Pages 13
ISSN 1752-4571
Publication year 2020
Published at Department of marine sciences, Tjärnö Marine Laboratory
Pages 13
Language en
Links dx.doi.org/10.1111/eva.12893
Keywords ascidians, gene flow, high-throughput sequencing, introduced species, introgression, population connectivity, ciona-intestinalis l, population admixture, local adaptation, r-package, invasion, hybridization, diversity, dispersal, ascidians, selection, Evolutionary Biology
Subject categories Marine ecology

Abstract

Research on the genetics of invasive species often focuses on patterns of genetic diversity and population structure within the introduced range. However, a growing body of literature is demonstrating the need to study how native genotypes affect both ecological and evolutionary mechanisms within the introduced range. Here, we used genotyping-by-sequencing to study both native and introduced ranges [based on 1,653 single nucleotide polymorphisms (SNPs)] of the amphiatlantic marine invertebrate Ciona intestinalis. A previous study using microsatellites analysed samples collected along the Swedish west coast and showed the presence of genetically distinct lineages in deep and shallow waters. Using 1,653 single nucleotide polymorphisms (SNPs) from newly collected samples (285 individuals), we first confirmed the presence of this depth-defined genomic divergence along the Swedish coast. We then used approximate Bayesian computation to infer the historical relationship among sites from the North Sea, the English Channel and the northwest Atlantic and found evidence of ancestral divergence between individuals from deep waters off Sweden and individuals from the English Channel. This divergence was followed by a secondary contact that led to a genetic admixture between the ancestral populations (i.e., deep Sweden and English Channel), which originated the genotypes found in shallow Sweden. We then revealed that the colonization of C. intestinalis in the northwest Atlantic was as a result of an admixture between shallow Sweden and the English Channel genotypes across the introduced range. Our results showed the presence of both past and recent genetic admixture events that together may have promoted the successful colonizations of C. intestinalis. Our study suggests that secondary contacts potentially reshape the evolutionary trajectories of invasive species through the promotion of intraspecific hybridization and by altering both colonization patterns and their ecological effects in the introduced range.

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