GENETIC MATCHES OF SOUTHERN RIGHT WHALES IN THE INDIAN SECTOR OF THE ANTARCTIC: A CONTRIBUTION TOWARDS UNDERSTANDING THEIR MOVEMENT AND SITE-FIDELITY

DOI Web Site
  • Pastene Luis A.
    Institute of Cetacean Research Project Microbiomes as Bioindicators of the Aquatic Ecosystem Health in Chilean Patagonia, Centro de Estudios del Cuaternario de Fuego-Patagonia y Antártica (CEQUA)
  • Goto Mutsuo
    Institute of Cetacean Research
  • Taguchi Mioko
    Institute of Cetacean Research
  • Matsuoka Koji
    Institute of Cetacean Research

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<p>Genetic analyses were conducted to investigate the individual identification (and matching) of southern right whales (Eubalaena australis) from samples collected in the austral summer in the Indian Ocean sector of the Antarctic (between 80°–135°E, south of 60°S). The study was conducted to evaluate the utility of this approach for studies on site fidelity and range. In total, 157 skin biopsy samples were collected from free-ranging whales during fourteen summer surveys. The DNA was extracted from each biopsy sample, genotyped at fourteen microsatellite loci, sequenced for 381 nucleotides of the mtDNA control region, and the sex determined by the presence of a Y-chromosome specific locus. Eight matches were detected (four males and four females) using individual matching by multi-locus genotypes supported by mtDNA haplotype and sex determination. Where photographs were available, two matches were confirmed by photo-identification. These eight re-samples show that at least some males and females returned to the same feeding grounds across years. The average longitudinal dispersal ranges, latitudinal dispersal ranges and average direct distances between marks and recaptures were: 13°06′ and 7°15′; 1°23′ and 0°47′; and 361 n.miles and 199 n.miles for males and females, respectively. The time spans ranged from 3–13 years with an average of 6.7 and 7.8 years for males and females, respectively. Sampling and matching occurred in an area where visual surveys showed aggregations of southern right whales associated with high krill concentration. The study confirms the feasibility of the genetic approach, but more definitive inferences on site fidelity and movement ranges will require a large number of biopsy samples genotyped, from both south and north of 60°S.</p>

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  • 鯨類資源研究

    鯨類資源研究 3 (0), 129-138, 2021-12-28

    鯨類資源研究刊行会

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