Strong population differentiation in lingcod (Ophiodon elongatus) is driven by a small portion of the genome
| Autor: | Greg Williams, Kelly S. Andrews, Krista M. Nichols, Bonnie L. Basnett, Michelle M. McClure, Gary C. Longo, Jameal F. Samhouri, Laurel S. Lam, Scott L. Hamilton, Giles W. Goetz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine population genomics heterogeneous genomic divergence Evolution Species distribution Population RAD sequencing 010603 evolutionary biology 01 natural sciences Intraspecific competition Gene flow Population genomics 03 medical and health sciences latitudinal cline Genetic variation Genetics QH359-425 education Northeast Pacific Ocean Ecology Evolution Behavior and Systematics Lingcod education.field_of_study biology biology.organism_classification 030104 developmental biology fisheries management Evolutionary biology Genetic structure General Agricultural and Biological Sciences |
| Zdroj: | Evolutionary Applications, Vol 13, Iss 10, Pp 2536-2554 (2020) |
| ISSN: | 1752-4571 |
| Popis: | Delimiting intraspecific genetic variation in harvested species is crucial to the assessment of population status for natural resource management and conservation purposes. Here, we evaluated genetic population structure in lingcod (Ophiodon elongatus), a commercially and recreationally important fishery species along the west coast of North America. We used 16,749 restriction site‐associated DNA sequencing (RADseq) markers, in 611 individuals collected from across the bulk of the species range from Southeast Alaska to Baja California, Mexico. In contrast to previous population genetic work on this species, we found strong evidence for two distinct genetic clusters. These groups separated latitudinally with a break near Point Reyes off Northern California, and there was a high frequency of admixed individuals in close proximity to the break. F‐statistics corroborate this genetic break between northern and southern sampling sites, although most loci are characterized by low FST values, suggesting high gene flow throughout most of the genome. Outlier analyses identified 182 loci putatively under divergent selection, most of which mapped to a single genomic region. When individuals were grouped by cluster assignment (northern, southern, and admixed), 71 loci were fixed between the northern and southern cluster, all of which were identified in the outlier scans. All individuals identified as admixed exhibited near 50:50 assignment to northern and southern clusters and were heterozygous for most fixed loci. Alignments of RADseq loci to a draft lingcod genome assembly and three other teleost genomes with chromosome‐level assemblies suggest that outlier and fixed loci are concentrated on a single chromosome. Similar genomic patterns have been attributed to chromosomal inversions in diverse taxonomic groups. Regardless of the evolutionary mechanism, these results represent novel observations of genetic structure in lingcod and designate clear evolutionary units that could be used to inform fisheries management. |
| Databáze: | OpenAIRE |
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