Population genetic structure in the North Atlantic Greenland halibut (Reinhardtius hippoglossoides): influenced by oceanic current systems?

2007 ◽  
Vol 64 (6) ◽  
pp. 857-866 ◽  
Author(s):  
Halvor Knutsen ◽  
Per Erik Jorde ◽  
Ole Thomas Albert ◽  
A Rus Hoelzel ◽  
Nils Chr. Stenseth
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
North Atlantic ◽  
Geographic Distance ◽  
Ocean Currents ◽  
Greenland Halibut ◽  
The North ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
The North Atlantic ◽  
Reinhardtius Hippoglossoides

We report statistically significant genetic structure among samples of Greenland halibut (Reinhardtius hippoglossoides), rejecting the null hypothesis of panmixia in the North Atlantic. The species appears instead to be subdivided into partially isolated populations, with some evidence for isolation by distance. However, there is a dichotomy between transatlantic sample comparisons and those within a regional current system, even when geographic distance is similar. Calculating geographic distance along the flow of ocean currents gave a more linear correlation with genetic differentiation than straight-line geographic distances, suggesting that gene flow follows ocean currents. We hypothesize that gene flow is mediated by drift of eggs and larvae with ocean currents, a hypothesis that is consistent with the extended pelagic phase of Greenland halibut larvae. This implies an important role for ocean currents in shaping the genetic structure of this and potentially other deep-sea species.

Greenland halibut (Reinhardtius hippoglossoides) in the North Atlantic are genetically homogeneous

1997 ◽  
Vol 54 (8) ◽  
pp. 1813-1821 ◽  
Author(s):  
M L Vis ◽  
S M Carr ◽  
W R Bowering ◽  
W S Davidson
Keyword(s):  
North Atlantic ◽  
Gadus Morhua ◽  
Genetic Distances ◽  
Greenland Halibut ◽  
Western Atlantic ◽  
Grand Banks ◽  
The North ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
The North Atlantic ◽  
Reinhardtius Hippoglossoides

Greenland halibut (Reinhardtius hippoglossoides) have become of great importance to the Canadian fishery since the moratorium on northern cod (Gadus morhua), and an understanding of stock relationships among populations at the northern and southern extremes of their commercial range is crucial for proper management. We compared mitochondrial DNA sequence variation among fish taken from thoughout the Northwest Atlantic (Flemish Pass, the Grand Banks, Davis Strait, and Northwest Greenland) with samples from the Gulf of St. Lawrence, Iceland, and Norway. Within a 401 base pair portion of the cytochrome b gene, 22 genotypes were identified. Three of these occur at frequencies >10% and in the same relative abundances in all samples (except the Gulf of St.Lawrence). Genotype proportions do not differ significantly among samples, and genetic subdivision among samples (measured by the coancestry coefficient theta ) is nil. Genetic distances among samples are not related to geographic distribution: pairwise differences between the Gulf sample and other western Atlantic samples exceed those for trans-Atlantic comparisons. These data suggest that there is sufficient mixing of Greenland halibut, not only within the NAFO regulatory area, but among sites in the North Atlantic generally, to prevent the development or maintenance of genetically independent stocks.

scholarly journals Genetic structure of the lumpfish Cyclopterus lumpus across the North Atlantic

2014 ◽  
Vol 71 (9) ◽  
pp. 2390-2397 ◽  
Author(s):  
Christophe Pampoulie ◽  
Sigurlaug Skirnisdottir ◽  
Guðbjorg Olafsdottir ◽  
Sarah J. Helyar ◽  
Vilhjálmur Thorsteinsson ◽  
...  
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Economic Value ◽  
Biological Knowledge ◽  
Structure Information ◽  
Cyclopterus Lumpus ◽  
The North ◽  
The North Atlantic

Abstract Lumpfish, or lumpsucker, Cyclopterus lumpus (Linnaeus, 1758) is widely distributed in the North Atlantic Ocean. It has a considerable economic value and substantial fisheries occur in several North Atlantic regions owing to the use of its fully ripe internal egg masses in the ovaries as an alternative to sturgeon caviar. Despite being intensively fished in several locations, biological knowledge is limited and no genetic structure information is available. In this study, the stock structure of C. lumpus was investigated across the North Atlantic using ten microsatellite loci. Out of ten loci, two exhibited higher level of differentiation but their inclusion/exclusion from the analyses did not drastically change the observed genetic pattern. A total of three distinct genetic groups were detected: Maine–Canada–Greenland, Iceland–Norway and Baltic Sea. These results, discussed in terms of origin of differentiation, gene flow, and selection, showed that gene flow was rather limited among the detected groups, and also between Greenland and Maine–Canada.

scholarly journals High gene flow in oceanic bottlenose dolphins (Tursiops truncatus) of the North Atlantic

2007 ◽  
Vol 8 (6) ◽  
pp. 1405-1419 ◽  
Author(s):  
Sophie Quérouil ◽  
Mónica A. Silva ◽  
Luís Freitas ◽  
Rui Prieto ◽  
Sara Magalhães ◽  
...  
Keyword(s):  
Gene Flow ◽  
North Atlantic ◽  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
The North ◽  
High Gene Flow ◽  
High Gene ◽  
The North Atlantic

scholarly journals Seascape genomics reveals population isolation in the reef-building honeycomb worm, Sabellaria alveolata (L.)

2019 ◽  
Author(s):  
Anna P Muir ◽  
Stanislas F. Dubois ◽  
Rebecca E. Ross ◽  
Louise B. Firth ◽  
Antony M. Knights ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
North Atlantic ◽  
Larval Dispersal ◽  
Balancing Selection ◽  
Isolated Population ◽  
The North ◽  
Outlier Loci ◽  
Dispersal Potential ◽  
The North Atlantic

Abstract Background Under the threat of climate change populations can disperse, acclimatise or evolve in order to avoid fitness loss. In light of this, it is important to understand neutral gene flow patterns as a measure of dispersal potential, but also adaptive genetic variation as a measure of evolutionary potential. In order to assess genetic variation and how this relates to environment in the honeycomb worm (Sabellaria alveolata (L.)), a reef-building polychaete that supports high biodiversity, we carried out RAD sequencing using individuals from along its complete latitudinal range. Patterns of neutral population genetic structure were compared to larval dispersal as predicted by ocean circulation modelling, and outlier analyses and genotype-environment associations tests were used to attempt to identify loci under selection in relation to local temperature data. Results We genotyped 482 filtered SNPs, from 68 individuals across nine sites, 27 of which were identified as outliers using BAYESCAN and ARLEQUIN. All outlier loci were potentially under balancing selection, despite previous evidence of local adaptation in the system. Limited gene flow was observed among reef-sites (FST = 0.28 ± 0.10), in line with the low dispersal potential identified by the larval dispersal models. The North Atlantic reef emerged as an isolated population and this was linked to high local larval retention and the effect of the North Atlantic Current on dispersal. Conclusions As an isolated population, with limited potential for natural genetic or demographic augmentation from other reefs, the North Atlantic site warrants conservation attention in order to preserve not only this species, but above all the crucial functional ecological roles that are associated with their bioconstructions. Our study highlights the utility of using seascape genomics to identify populations of conservation concern.

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