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

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 elev...

Full description

Bibliographic Details
Published in:Marine Ecology Progress Series
Main Authors: Knutsen, Halvor, Jorde, Per Erik, Bergstad, Odd Aksel, Skogen, Morten D.
Format: Article in Journal/Newspaper
Language:English
Published: Inter-Research 2012
Subjects:
roundnose grenadier
skolest
genetics
genetikk
population structure
populasjonsstruktur
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921
VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923
VDP::Social science: 200::Library and information science: 320::Knowledge retrieval and organization: 323
Canada
Norway
North Atlantic
Online Access:http://hdl.handle.net/11250/109226
https://doi.org/10.3354/meps09728
Description
Summary: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. 2017-07-24

Similar Items