Population Genomics of Adaptive Radiations: Exceptionally High Levels of Genetic Diversity and Recombination in an Endemic Spider From the Canary Islands.
Journal
Molecular ecology
ISSN: 1365-294X
Titre abrégé: Mol Ecol
Pays: England
ID NLM: 9214478
Informations de publication
Date de publication:
14 Oct 2024
14 Oct 2024
Historique:
revised:
26
08
2024
received:
17
04
2024
accepted:
24
09
2024
medline:
14
10
2024
pubmed:
14
10
2024
entrez:
14
10
2024
Statut:
aheadofprint
Résumé
The spider genus Dysdera has undergone a remarkable diversification in the oceanic archipelago of the Canary Islands, with ~60 endemic species having originated during the 20 million years since the origin of the archipelago. This evolutionary radiation has been accompanied by substantial dietary shifts, often characterised by phenotypic modifications encompassing morphological, metabolic and behavioural changes. Hence, these endemic spiders represent an excellent model for understanding the evolutionary drivers and to pinpoint the genomic determinants underlying adaptive radiations. Recently, we achieved the first chromosome-level genome assembly of one of the endemic species, D. silvatica, providing a high-quality reference sequence for evolutionary genomics studies. Here, we conducted a low coverage-based resequencing study of a natural population of D. silvatica from La Gomera island. Taking advantage of the new high-quality genome, we characterised genome-wide levels of nucleotide polymorphism, divergence and linkage disequilibrium, and inferred the demographic history of this population. We also performed comprehensive genome-wide scans for recent positive selection. Our findings uncovered exceptionally high levels of nucleotide diversity and recombination in this geographically restricted endemic species, indicative of large historical effective population sizes. We also identified several candidate genomic regions that are potentially under positive selection, highlighting relevant biological processes, such as vision and nitrogen extraction as potential adaptation targets. These processes may ultimately drive species diversification in this genus. This pioneering study of spiders that are endemic to an oceanic archipelago lays the groundwork for broader population genomics analyses aimed at understanding the genetic mechanisms driving adaptive radiation in island ecosystems.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e17547Subventions
Organisme : Ministerio de Ciencia e Innovación
ID : BES-2017-081740
Organisme : Ministerio de Ciencia e Innovación
ID : MCIN/AEI/10.13039/501100011033
Organisme : Ministerio de Ciencia e Innovación
ID : PID2019-103
Organisme : Ministerio de Ciencia e Innovación
ID : PID2019-105794GB
Organisme : Ministerio de Ciencia e Innovación
ID : PID2022-137758NB-I00
Organisme : Ministerio de Ciencia e Innovación
ID : PID2022-138477NB-C22
Organisme : Comissió Interdepartamental de Recerca i Innovació Tecnològica
ID : 2021SGR00279
Informations de copyright
© 2024 The Author(s). Molecular Ecology published by John Wiley & Sons Ltd.
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