ABSTRACTS OF POSTERS –ABUNDANCE & DISTRIBUTION
aB 15 Seasonal dynamics of distribution of marine mammals in the area off antarctic Peninsula (vessel-based observations)
Olga Kirillova (1), Anton Chernetsky (1), Vsevolod Belkovich (1) (1) P.P. Shirshov Institute of Oceanology
olga.kirillova@
mail.ru
In 2005-2009, the observation on board ship recorded 14 cetacean species whose percentages were different. Fin whales (Balaenoptera physalus) – 4.3%, sei whales (Balaenoptera borealis) – 3.2%, sperm whales (Physeter macrocephalus) – 0.4%, Cuvier’ beaked whales (Ziphius cavirostris) – 0.6%, southern bottlenose whale (Hyperoodon planifrons) – 0.6%, hourglass dolphins (Lagenorhynchus cruciger) – 7%, pilot whales (Globicephalamelas) – 0.2%, occurred predominantly in open waters (Drake Passage, Scotia Sea). Southern right whales (EuBalaena australis) and Commersons dolphin (Cephalorhynchus commersonii) were recorded off Falkland Islands (by 0.2 %). Peales dolphins (Lagenorhynchus australis) – 8.6% were recorded in the coastal zone of Tierra del Fuego. Lagenorhynchus – 0.2% were noted in «0 trip». Minke whales (9.5%) and killer whales (Orcinus orca) (4.6%) were recorded both in coastal and open waters. Killer whales kept in family groups by 4-6 specimens. In 2007, a group of 15 killer whales was recorded which were actively hunting involving their young. The most mass species of those recorded was humpback whale – 60.4%. Further on, we will mention dynamics of seasonal distribution. We did not observe resting and foraging Minke whales. In the area of our investigations they occurred as single individuals. In bays they spent up to 73% of time in the resting state (that of sleep-rest). Actively foraging whales (by two-three specimens) in March occurred in straits, as rarified groups by 10-12 specimens. They rapidly swam past our vessel, often in immediate proximity of humpback whales. The maximum size of the group (four specimens) was noted just once. Thus, during the season the distribution, abundance, and behaviour of whales change. During 15 years of active ecotourism the humpback whales learned not fear of vessels and “Zodiacs” and this may be highly dangerous to them if Japan would decide to resume whaling.
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