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SÉVIGNY, J.-M., A. VALENTIN, A. TALBOT, N. MÉNARD, 2009. Connectivité entre les populations du fjord du Saguenay et celles du golfe du Saint-Laurent;Connectivity between Saguenay Fjord populations and those of the Gulf of St. Lawrence. Rev. Sci. Eau;J. Water Sci., 22(2): 315-339 .
Microsatellite and allozyme analyses on various species of bottom fishes (cod, Greenland halibut and redfish) and crustace ans (snow crab, northern shrimp) show that individuals from the Saguenay Fjord and from the St. Lawrence belong ta 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 para ice fauna) show clear differences between the aguenay 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 juvenile from the St. Lawrence. Although there are no complememary data for crustacean species, it is possible that migration and residence are processes operating for those species as well.©2009 RSE inc.
VALENTIN A.E., X. PENIN, J.-P. CHANUT, J.-M. SÉVIGNY, F. J. ROHLF, 2008. Arching effect on fish body shape in geometric morphometric studies. J. Fish Biol., 73: 623-638 .
Upward and downward arching of the body was observed during a study on redfishes Sebastes sp. Population structure in the north-west Atlantic Ocean. The present study investigated the potential causes of this arching artefact. The results suggested that it is not related to biological factors (size or species) or to the preservation technique (freezing), but is rather due to slight posture differences between fishes during landmark capture. The consequences of the arching artefact on data analysis are discussed. An approach coupling a PCA-based model of the arching with Burnaby's orthogonal projection is proposed for removing the artefact from the data.©2008 The Authors & The Fisheries Society of the British Isles
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