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Marine Ecology Progress Series

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MEPS 460:233-246 (2012)  -  DOI: https://doi.org/10.3354/meps09728

Population genetic structure in a deepwater fish Coryphaenoides rupestris: patterns and processes

Halvor Knutsen1,2,3,*, Per Erik Jorde2, Odd Aksel Bergstad1, Morten Skogen

1Institute of Marine Research, Flødevigen, 4817 His, Norway
2Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway
3University of Agder, 4604 Kristiansand, Norway
4Institute of Marine Research, 5817 Bergen, Norway

ABSTRACT: We observed significant genetic structure in a widely distributed North Atlantic demersal deepwater fish, the roundnose grenadier Coryphaenoides rupestris (Pisces: Macrouridae). The overall estimate of genetic differentiation, based on 6 microsatellite loci (FST = 0.0152; p < 0.0001), was elevated by samples from the periphery of the species’ range, off Norway and Canada. Samples from the central area of distribution showed less pronounced genetic structure, indicating more extensive dispersal and gene flow. Simulations were run to assess expected patterns of genetic differentiation under 2 major hypotheses of gene flow: passive larval drift and demographic diffusion. In spite of the relatively long duration of the pelagic egg and juvenile phases, no correlation was found between observed pairwise FST values and those predicted under the hypothesis of drift of progeny by ocean currents. The observed pattern may instead arise from a combination of bathymetric barriers limiting deep pelagic mixing and advection, early life ontogenetic changes in vertical distribution, and limited migration once a benthopelagic life style has been established.


KEY WORDS: North Atlantic · Roundnose grenadier · Macrouridae · Connectivity · Genetics · Dispersal modeling


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Cite this article as: Knutsen H, Jorde PE, Bergstad OA, Skogen M (2012) Population genetic structure in a deepwater fish Coryphaenoides rupestris: patterns and processes. Mar Ecol Prog Ser 460:233-246. https://doi.org/10.3354/meps09728

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