Diversity, Relative Abundance, New Locality Records And Population Structure Of Antarctic Demersal Fishes From The Northern Scotia Arc Islands And Bouvetoya

摘要

notothenioids at Bouvet0ya (L. larseni, L. squamifrons, Notothenia coriiceps and Chaenocephalus aceratus), we examined the ND2 portion of mitochondrial DNA. Chaenocephalus aceratus, N. coriiceps and L. larseni exhibited no significant genetic differentiation in comparison with samples from localities in the Scotia Sea and the Antarctic Peninsula. However, L. squamifrons showed significant genetic differentiation between the South Shetlands and Bouvet0ya populations (F_(ST) = 0.189, P = 0.015). Thus, these data combined with previous studies of two other notothenioids suggest that five of the six notothenioid species at Bouvet0ya are not genetically differentiated from other localities in the Atlantic sector of the Southern Ocean. The location of Bouvet0ya within the Antarctic Circumpolar Current and the long (1-2 years) pelagic stages of the notothenioids at Bouvet0ya may be at least partly responsible for this genetic homogeneity.