Population genetic structure in a deepwater fish Coryphaenoides rupestris: patterns and processes
Journal article, Peer reviewed
Permanent lenke
http://hdl.handle.net/11250/109226Utgivelsesdato
2012-07-24Metadata
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Originalversjon
http://dx.doi.org/10.3354/meps09728Sammendrag
We observed significant genetic structure in a widely distributed North Atlantic
demersal deepwater fish, the roundnose grenadier Coryphaenoides rupestris (Pisces: Macro -
uridae). 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.