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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Diversity, relative abundance, new locality records and population structure of Antarctic demersal fishes from the northern Scotia Arc islands and Bouvetøya
Polar Biology, Volume 31, No. 12, Year 2008
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Description
A primary objective of the ICEFISH 2004 cruise was to collect and study notothenioid fishes from remote localities in the Atlantic sector of the Southern Ocean. Nearly 1 month was devoted to bottom trawling for fishes on the shelf and upper slope (to 1,000 m) areas around Shag Rocks, South Georgia, South Sandwich Islands and Bouvetøya. The focus was on the latter two locations, because their faunas are more poorly known. Eight species were collected at Shag Rocks with Patagonotothen guntheri most abundant; 17 at South Georgia with Lepidonotothen nudifrons, L. larseni and Gobionotothen gibberifrons most abundant; 13 at the South Sandwich Islands with L. larseni, L. nudifrons and G. gibberifrons most abundant; and 11 at Bouvetøya with L. larseni, Macrourus holotrachys and L. squamifrons most abundant. Ten new locality records were established: Shag Rocks (1), South Georgia (1), South Sandwich Islands (5), South Sandwich Trench at 5,350 m (1) and Bouvetøya (2). Total known demersal fish diversity on the shelf and upper slope at Shag Rocks/South Georgia, South Sandwich Islands and Bouvetøya is 42, 31 and 17 species, respectively. To examine population structure in the four most abundant notothenioids at Bouvetøya (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 Bouvetøya 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 Bouvetøya are not genetically differentiated from other localities in the Atlantic sector of the Southern Ocean. The location of Bouvetøya within the Antarctic Circumpolar Current and the long (1-2 years) pelagic stages of the notothenioids at Bouvetøya may be at least partly responsible for this genetic homogeneity. © 2008 Springer-Verlag.
Authors & Co-Authors
Jones, Christopher D.
United States, Washington, D.c.
National Oceanic and Atmospheric Administration
Eric Anderson, M.
South Africa, Grahamstown
South African Institute for Aquatic Biodiversity
Balushkin, Arcady V.
Russian Federation, Saint Petersburg
Zoological Institute of the Russian Academy of Sciences
Duhamel, Guy
France, Paris
Museum National D'histoire Naturelle
Eakin, Richard R.
Unknown Affiliation
Eastman, Joseph T.
United States, Athens
Ohio University
Kuhn, Kristen L.
United States, New Haven
Yale University
Lecointre, Guillaume
France, Paris
Museum National D'histoire Naturelle
Near, Thomas J.
United States, New Haven
Yale University
North, Anthony W.
Unknown Affiliation
Stein, D. L.
United States, Corvallis
Oregon State University
Vacchi, Marino
Italy, Genoa
Università Degli Studi Di Genova
Detrich, H. W.
United States, Boston
Northeastern University
Statistics
Citations: 36
Authors: 13
Affiliations: 9
Identifiers
Doi:
10.1007/s00300-008-0489-x
Research Areas
Genetics And Genomics
Study Design
Cross Sectional Study