Diversity, relative abundance, new locality records and population structure of Antarctic demersal fishes from the northern Scotia Arc islands and Bouvetøya - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Polar Biology Année : 2008

Diversity, relative abundance, new locality records and population structure of Antarctic demersal fishes from the northern Scotia Arc islands and Bouvetøya

Christopher D. Jones
  • Fonction : Auteur
M. Eric Anderson
  • Fonction : Auteur
Arcady V. Balushkin
  • Fonction : Auteur
Guy Duhamel
  • Fonction : Auteur
  • PersonId : 846322
Richard R. Eakin
  • Fonction : Auteur
Joseph T. Eastman
  • Fonction : Auteur
Kristen L. Kuhn
  • Fonction : Auteur
Thomas J. Near
  • Fonction : Auteur
Anthony W. North
  • Fonction : Auteur
David L. Stein
  • Fonction : Auteur
Marino Vacchi
  • Fonction : Auteur
H. William Detrich Ill
  • Fonction : Auteur

Résumé

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

Dates et versions

hal-00383894 , version 1 (13-05-2009)

Identifiants

Citer

Christopher D. Jones, M. Eric Anderson, Arcady V. Balushkin, Guy Duhamel, Richard R. Eakin, et al.. Diversity, relative abundance, new locality records and population structure of Antarctic demersal fishes from the northern Scotia Arc islands and Bouvetøya. Polar Biology, 2008, 31, pp.1481-1497. ⟨10.1007/s00300-008-0489-x⟩. ⟨hal-00383894⟩
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