Kulagin D.N.1, Stupnikova A.N.1, Neretina T.V.2, Mugue N.S.3 2011. [Genetic diversity of Eukrohnia hamata (Chaetognatha) in the South Atlantic: analysis of gene mtCO1] // Invertebrate Zoology. Vol.8. No.2: 127–136 [in Russian, with English summary].

1 P.P.Shirshov Institute of Oceanology Russian Academy of Science, 36, Nakhimovsky prospect, Moscow, 117997, Russia; e-mail: kulagin.dima@gmail.com

2 White Sea Biological Station, Department of Biology Lomonosov Moscow State University, P.O. Box 20, Glavpochtamt, Kandalaksha raion, Murmanskaya oblast 184042, Russia.

3 Russian Federal Research Institute of Fisheries and Oceanography, 17 Verhnyaya Krasnoselskaya, Moscow 107140, Russia.

KEY WORDS: Zooplankton, chaetognaths, molecular phylogeny, the Atlantic Ocean, Southern Ocean.

ABSTRACT: Genetic diversity and structure of the cosmopolitan chaetognath Eukrohnia hamata became the object of our research. The material was partly collected in the Atlantic Sector of the Sothern Ocean (17 specimens) and partly taken from the GenBank NCBI (2 specimens from Arctica and 3 specimens from South East Atlantic). All 22 specimens analyzed had unique haplotypes in their 5’ COI gene fragment (“barcoding” region) mtDNA sequences. Four distinct lineages were revealed by the phylogenetic analysis. These lineages (populations) had significant genetic differences that made 7–13% of the nucleotide substitutions and were geographically separated. The boundaries of their distribution are the large-scale oceanic fronts. Antarctic population can be distinguished in the Atlantic sector of the Southern Ocean to the south of the Polar Front in the Antarctic zone. To the north of the Polar Front in the Polar Frontal Zone and the Subantarctic Zone — Subantarctic population can be distinguished. Antarctic Circumpolar Current maintains genetic homogeneity of the Antarctic and Subantarctic populations of E. hamata within the whole Atlantic sector of the Southern Ocean. Tropical population was distinguished to the north of the Subtropical Front, but individuals of E. hamata from this lineage can reach the Subantarctic Zone with the rings of the Subtropical Front.

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