Karina Vishnyakova, an international scientific observer, conducted cetacean observations from a platform of opportunity, abroad polish trawler Dalmor II that fished Antarctic krill, during a cruise from March to July 2011. Most of the fishing season the vessel was in the CCAMLR statistical area 48.2, to the north-east of the South Orkney Islands. Observations were conducted on the vessel deck or on the bridge. The following data were recorded: observation details, time, geographical coordinates, species and number of animals in a group (or minimum abundance estimate), distance from the vessel and behavioral specific details. Also the photo material was collected. Over the observation period 50 sightings of at least 280 individuals were recorded. Vast majority of recorded sightings (90%) and individuals (at least 90%) were minke whales (Balaenoptera bonaerensis); humpback whales (Megaptera novaeangliae) were recorded in 5 cases. The largest minke whale groups were recorded in first ten-day period of April. Whales in such groups demonstrated feeding behavior, actively fed on the high density krill aggregations. Probably such aggregations were later fished by vessels on those fishing grounds. Group size varied from 2-3 up to few tens individuals (in the mean 6 ± 9.23 (standard deviation), median 3 individuals). In first ten-day period of April average number of individuals in groups was 12 whales ( ± 15.75 (standard deviation), median 8 individuals). Frequency of occurrence did not correlated with the time of day. Distance to the animals also varied from few meters to 5-7 kilometers. However, direct interactions of whales with the vessel were never recorded. By late April – early May, number of sightings sharply declined, they became sporadic. During that period fast migrations of small whale groups were recorded. Also minke whales demonstrated «nervous» behavior, coming to the surface frequently and moving fast and jerky. Humpback whales were recorded in groups of 2-3 individuals at late April near the South Orkney Islands and early May near the South Shetland Islands.
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Researchers should cite this work as follows:
Vishnyakova K (2016): Antractic whale observation on a platform of opportunity abroad krill fishing vessel "Dalmor II", April - July 2011.. v1.9. Ukrainian Scientific Centre of Ecology of the Sea (UkrSCES). Dataset/Occurrence. http://gp.sea.gov.ua:8082/ipt/resource?r=whale_observation_ccamlr_ukrsces&v=1.9
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The publisher and rights holder of this work is Ukrainian Scientific Centre of Ecology of the Sea (UkrSCES). To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction.
This resource has been registered with GBIF, and assigned the following GBIF UUID: e8e2a3e6-0225-4d37-8c66-5f00cc75c181. Ukrainian Scientific Centre of Ecology of the Sea (UkrSCES) publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.
Antarctic; whales observation; occurence; Humpback whale; Minke whale; Observation
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Whale observation data was collected abroad polish trawler Dalmor II that fished Antarctic krill in the CCAMLR statistical area 48. Observation details, group size, behavioral specific details were fixed. Also photo material was collected. There were 50 sightings of at least 280 individuals from March to July 2011. Vast majority sightings (90%) were minke whales (Balaenoptera bonaerensis). Also humpback whales (Megaptera novaeangliae) were recorded.
|Bounding Coordinates||South West [-62.08, -59.27], North East [-60.16, -46.53]|
|Start Date / End Date||2011-04-01 / 2011-06-22|
visual observations on a platform of opportunity
|Study Extent||statistical subarea 48.2, 48.1; 01.04.2011 - 25.04.2011 - 48.2, 04.05.2011 - 14.05.2011 - 48.1, 20.05.2011 - 22.06.2011 - 48.2|
Method step description:
marine, harvested by iOBIS