Studies on the composition of the stock of Chaenocephalus aceratus (Lönnberg, 1906), Pisces, Channichthyidae, in the region of South Georgia and South Shetlands

Kompowski, Andrzej

doi:10.3750/aip1990.20.1.03

Cited by 5 publications

(1 citation statement)

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“…In fact, a general deficit of heterozygotes found in the present study supports this scenario in Chaenocephalus aceratus. In addition, high recruitment variability was reported for this species (Kompowski 1990) and other Antarctic fish (Hill et al 2005, suggesting the importance of variance in reproductive success in these organisms. In particular, for the mackerel icefish Champsocephalus gunnari in South Georgia (Hill et al 2005) and the Patagonian toothfish Dissostichus eleginoides on the Shag Rocks shelf , the variability was explained by sea surface temperature (SST) fluctuations.…”

Section: Recruitment and Reproductive Success Variabilitymentioning

confidence: 72%

Spatial and temporal boundaries to gene flow between Chaenocephalus aceratus populations at South Orkney and South Shetlands

Papetti¹,

Susana²,

Patarnello³

et al. 2009

Mar. Ecol. Prog. Ser.

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The black-fin icefish Chaenocephalus aceratus is among the most abundant fish species on the Antarctic continental shelves of the Scotia Arc, and Bouvet Island. We genotyped 11 microsatellite loci in C. aceratus population samples from South Orkney, southern South Shetlands, and Elephant Island (northern South Shetlands) collected in 2002 and 2006. This investigation further develops a previous study on the species reporting the presence of one panmittic population in southern South Shetlands and Elephant Island, with genetic differentiation between year classes. Our results reveal a more complex pattern of differentiation than shown previously, as genetic differences occur both at the temporal level at Elephant Island and at the geographic scale between southern South Shetland -Elephant Islands and South Orkney population samples. In particular, the magnitude of genetic differentiation at the temporal scale, the relatively high effective population size (N e ) and high gene flow indicate that genetic differentiation is not only driven by geographic distance. At present, our results should be taken into account when defining conservation measures and management boundaries in regions where fishery is still open or where other Antarctic fish species are still exploited.

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Section: Recruitment and Reproductive Success Variabilitymentioning

confidence: 72%