Population Genetics of Marine Rockfish Species

Population genetics examines the distribution and dynamics of genetic variation within and among marine rockfish (Sebastes spp.) populations, integrating principles of evolutionary biology, ecology and conservation. These long‐lived viviparous fishes display remarkable diversity in morphology, lifespan and habitat use, from shallow rocky reefs to deep‐water slopes. Genetic studies have revealed complex patterns of connectivity shaped by ocean currents, depth gradients, glacial refugia and species‐specific life histories such as larval duration and reproductive mode. Genome‐wide markers, including single nucleotide polymorphisms (SNPs) and restriction‐site associated DNA sequencing (RADseq), have enabled high‐resolution delineation of management units, identification of cryptic lineages and detection of adaptive divergence in genes linked to reproduction, sensory perception and stress response. Analyses of both neutral and adaptive variation have elucidated historical demography, hybridisation events and introgression among sympatric species, often without erosion of species boundaries. These insights are critical for sustainable fisheries management and conservation, guiding the design of marine protected areas, refining stock assessments and forecasting responses to climate change. Comparative studies across the Pacific and Atlantic basins underscore the global significance of rockfish as models for studying speciation, adaptation and resilience in a changing ocean environment.

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Population Genetics of Marine Rockfish Species publication trend

The graph below shows the total number of articles in population genetics of marine rockfish species across all publications each year (not limited to Nature Index journals).

Technical terms

Population structure: The distribution of genetic variation within and among populations of a species.

Single nucleotide polymorphism (SNP): A DNA sequence variation occurring when a single nucleotide differs between individuals.

Restriction-site associated DNA sequencing (RADseq): A method for sampling thousands of genetic loci by sequencing regions adjacent to restriction enzyme cut sites.

Introgression: The incorporation of genes from one species or population into another through hybridisation and backcrossing.

Ecotype: A genetically distinct population adapted to a specific environmental niche or habitat.

References

1. Divergent Population Structure in Five Common Rockfish Species of Puget Sound, WA Suggests the Need for Species‐Specific Management. Molecular Ecology (2024).
2. Genome-wide markers reveal differentiation between and within the cryptic sister species, sunset and vermilion rockfish. Conservation Genetics (2021).
3. Genetic divergences and hybridization within the Sebastes inermis complex. PeerJ (2023).