Connectivity between Saguenay Fjord populations and those of the Gulf of St. Lawrence

Microsatellite and allozyme analyses on various species of bottom fishes (cod, Greenland halibut and redfish) and crustaceans (snow crab, northern shrimp) show that individuals from the Saguenay Fjord and from the St. Lawrence belong to the same populations. The only genetic difference observed is a...

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Bibliographic Details
Published in:Revue des sciences de l'eau
Main Authors: Jean-Marie Sévigny, André J. Talbot, Nadia Ménard, Alexandra E. Valentin
Format: Article in Journal/Newspaper
Language:French
Published: Université du Québec - INRS-Eau, Terre et Environnement (INRS-ETE) 2009
Subjects:
Sciences Humaines et Sociales
Social Sciences and Humanities
connectivité
allozyme
microsatellite
Pan I
Gadus morhua
Reinhardtius hippoglossoides
Sebastes spp
Chionoecetes opilio
Pandalus borealis
connectivity
Pan 1
anthro-se
envir
Greenland
Groenland
northern shrimp
Snow crab
Online Access:http://www.erudit.org/fr/revues/rseau/2009-v22-n2-rseau3113/037487ar.pdf
https://www.erudit.org/fr/revues/rseau/2009-v22-n2-rseau3113/037487ar.pdf
https://doi.org/10.7202/037487ar
https://id.erudit.org/iderudit/037487ar
https://www.erudit.org/fr/revues/rseau/2009-v22-n2-rseau3113/037487ar/
https://core.ac.uk/display/59326189
https://academic.microsoft.com/#/detail/2163434913
Description
Summary:Microsatellite and allozyme analyses on various species of bottom fishes (cod, Greenland halibut and redfish) and crustaceans (snow crab, northern shrimp) show that individuals from the Saguenay Fjord and from the St. Lawrence belong to the same populations. The only genetic difference observed is at the Pan I locus of cod. This differentiation may be caused by selection that would act in the Saguenay Fjord, rather than due to the genetic isolation of the population. Complementary data available for bottom fish (elemental composition of otoliths, body morphometry, and parasite fauna) show clear differences between the Saguenay and the St. Lawrence. These differences suggest residence of individuals in the Saguenay and the St. Lawrence for a large proportion of their life cycle. Considering the low larval survival observed in the fjord, this review suggests that the bottom fish populations from the Saguenay represent sink populations whose recruitment depends largely or solely on migration of juveniles from the St. Lawrence. Although there are no complementary data for crustacean species, it is possible that migration and residence are processes operating for those species as well. L’analyse des marqueurs microsatellites et d’allozymes chez différentes espèces de poissons de fond (morue, flétan du Groenland et sébaste) et de crustacés (crabe des neiges et crevette nordique) montre que les organismes du Saguenay et du Saint-Laurent appartiennent aux mêmes populations. La seule différenciation génétique est observée au locus Pan I chez la morue. Cette différenciation pourrait toutefois être causée par la sélection, qui agirait dans le fjord du Saguenay, plutôt que par l’isolement génétique de la population. Les données complémentaires disponibles pour les poissons de fond (composition élémentaire des otolithes, morphométrie et faune parasitaire) montrent que les individus capturés dans le Saguenay diffèrent de ceux du Saint-Laurent. Ces différences suggèrent que les individus du Saguenay et du Saint-Laurent ...

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