Population genomics and history of speciation reveal fishery management gaps in two related redfish species (Sebastes mentella and Sebastes fasciatus)

Evolutionary Applications

Laura M. Benestan¹  Louis Bernatchez²  Quentin Rougemont²  Eric Normandeau²  Caroline Senay³  Geneviève J. Parent³  Eric Parent³  Yvan Lambert³  Rick Rideout⁴  Céline Audet⁵ 

[1] CEFE Univ Montpellier, CNRS, EPHE‐PSL University IRD, Univ Paul Valéry Montpellier 3 Montpellier France;Département de biologie, Institut de Biologie Intégrative et des Systèmes (IBIS) Université Laval Québec QC Canada;Fisheries and Oceans Canada Maurice‐Lamontagne Institute Mont‐Joli QC Canada;Fisheries and Oceans Canada Northwest Atlantic Fisheries Centre N.L. St. John’s Canada;Institut des sciences de la mer de Rimouski Université du Québec à Rimouski Rimouski QC Canada;

关键词: demographic models;    fishery management;    population genomics;    related species;    Sebastes;    spatial ecology;   

DOI  :  10.1111/eva.13143

来源: DOAJ

【 摘 要 】

Abstract Understanding the processes shaping population structure and reproductive isolation of marine organisms can improve their management and conservation. Using genomic markers combined with estimation of individual ancestries, assignment tests, spatial ecology, and demographic modeling, we (i) characterized the contemporary population structure, (ii) assessed the influence of space, fishing depth, and sampling years on contemporary distribution, and (iii) reconstructed the speciation history of two cryptic redfish species, Sebastes mentella and S. fasciatus. We genotyped 860 individuals in the Northwest Atlantic Ocean using 24,603 filtered single nucleotide polymorphisms (SNPs). Our results confirmed the clear genetic distinctiveness of the two species and identified three ecotypes within S. mentella and five populations in S. fasciatus. Multivariate analyses highlighted the influence of spatial distribution and depth on the overall genomic variation, while demographic modeling revealed that secondary contact models best explained inter‐ and intragenomic divergence. These species, ecotypes, and populations can be considered as a rare and wide continuum of genomic divergence in the marine environment. This acquired knowledge pertaining to the evolutionary processes driving population divergence and reproductive isolation will help optimizing the assessment of demographic units and possibly to refine fishery management units.

【 授权许可】

Unknown