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

Secondary contacts and genetic admixture shape colonization by an amphiatlantic epibenthic invertebrate
Secondary contacts and genetic admixture shape colonization by an amphiatlantic epibenthic invertebrate
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.
ascidians, gene flow, high-throughput sequencing, introduced species, introgression, population connectivity
1752-4563
600-612
Hudson, James
13270335-45dc-4760-aec9-38270359389a
Johannesson, Kerstin
d774df0a-e41f-4bb5-abc2-6ab27b610912
McQuaid, Christopher D.
97f8c217-f30c-405c-8cf3-f616208b5008
Rius, Marc
c4e88345-4b4e-4428-b4b2-37229155f68d
Hudson, James
13270335-45dc-4760-aec9-38270359389a
Johannesson, Kerstin
d774df0a-e41f-4bb5-abc2-6ab27b610912
McQuaid, Christopher D.
97f8c217-f30c-405c-8cf3-f616208b5008
Rius, Marc
c4e88345-4b4e-4428-b4b2-37229155f68d

Hudson, James, Johannesson, Kerstin, McQuaid, Christopher D. and Rius, Marc (2020) Secondary contacts and genetic admixture shape colonization by an amphiatlantic epibenthic invertebrate. Evolutionary Applications, 13 (3), 600-612. (doi:10.1111/eva.12893).

Record type: Article

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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More information

Accepted/In Press date: 1 January 2019
e-pub ahead of print date: 12 November 2019
Published date: March 2020
Additional Information: This paper was included in a volume in 2020
Keywords: ascidians, gene flow, high-throughput sequencing, introduced species, introgression, population connectivity

Identifiers

Local EPrints ID: 436534
URI: http://eprints.soton.ac.uk/id/eprint/436534
ISSN: 1752-4563
PURE UUID: 865c6408-dc95-4dd8-bb64-af7d42334870

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Date deposited: 12 Dec 2019 17:30
Last modified: 21 Nov 2021 19:08

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Contributors

Author: James Hudson
Author: Kerstin Johannesson
Author: Christopher D. McQuaid
Author: Marc Rius

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