Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Antarctica)
The state of the leopard seal population (Hydrurga leptonyx Blainville, 1828) in waters of the Argentine Islands was studied during the periods April 2015 — March 2016 and April 2018 — March 2019 according to the objectives of the State Target Scientific and Technical Research Programme of Ukraine i...
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National Academy of Sciences of Ukraine. National Museum of Natural History
2020
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Online Access: | https://doi.org/10.15407/TU1916 https://doaj.org/article/e3d2ec13311a4849be54f03a0c724582 |
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ftdoajarticles:oai:doaj.org/article:e3d2ec13311a4849be54f03a0c724582 2023-05-15T13:50:45+02:00 Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Antarctica) Pavlo B. Khoyetskyy 2020-07-01T00:00:00Z https://doi.org/10.15407/TU1916 https://doaj.org/article/e3d2ec13311a4849be54f03a0c724582 EN UK eng ukr National Academy of Sciences of Ukraine. National Museum of Natural History http://www.terioshkola.org.ua/library/pts19-dama/TU1916-khoyetskyy.htm https://doaj.org/toc/2616-7379 https://doaj.org/toc/2617-1120 doi:10.15407/TU1916 2616-7379 2617-1120 https://doaj.org/article/e3d2ec13311a4849be54f03a0c724582 Theriologia Ukrainica, Vol 19, Pp 138-147 (2020) hydrurga leptonyx pygoscelis papua lobodon carcinophagus antarctica population size population structure animal feeding Zoology QL1-991 article 2020 ftdoajarticles https://doi.org/10.15407/TU1916 2022-12-30T23:57:04Z The state of the leopard seal population (Hydrurga leptonyx Blainville, 1828) in waters of the Argentine Islands was studied during the periods April 2015 — March 2016 and April 2018 — March 2019 according to the objectives of the State Target Scientific and Technical Research Programme of Ukraine in Antarctica for the period 2011–2020. During the study period, 14 males and 16 females were recorded within the archipelago (1M : 1.1F ratio). About 7 % of the seals were young individuals and more than 90% were adults. Leopard seals were recorded during all periods of the year. In the summer-autumn period, within the archipelago, there were 2 to 4 individuals simultaneously. The maximum period of stay of the predators in waters of the archipelago was about two weeks. Two individuals for at least two weeks were recorded twice in waters of the archipelago. The maximum period of absence of the seals in waters of the archipelago was 118 days. It was found that the occurrence of leopard seals and hence the traces of their life activities in various years were of different nature. In the autumn (April–May) of 2015, they were seen less frequently, on average every 6.3 ± 2.5 days, and in the autumn of 2018, on the contrary, more frequently, on average every 2.5 ± 0.5 days. The activity of the leopard seal in the winter (June, August) of 2015 decreased by half. It was recorded that the animals appeared in waters of the archipelago on average every 12.7 ± 5.5 days, and in the winter of 2018 — 5.5 ± 1.9 days. In the autumn of 2018, the predators and traces of their vital activities were seen less often — every 6.6 ± 1.6 days. During the study period, out of 78 recorded cases of the leopard seal’s occurrence, about 56 % of cases were recorded when they were on ice floes, in other cases (44 %) — when they were in water. In addition, several crabeater seals were recorded three times on an ice floe at an insignificant distance from a leopard seal. One of the main prey items for leopard seals within the archipelago are birds, in ... Article in Journal/Newspaper Antarc* Antarctica Argentine Islands Crabeater Seals Hydrurga leptonyx Leopard Seal Leopard Seals Lobodon carcinophagus Pygoscelis papua Directory of Open Access Journals: DOAJ Articles Argentine Argentine Islands ENVELOPE(-64.273,-64.273,-65.246,-65.246) Hydrurga ENVELOPE(-61.626,-61.626,-64.145,-64.145) Theriologia Ukrainica 2020 19 138 147 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Ukrainian |
topic |
hydrurga leptonyx pygoscelis papua lobodon carcinophagus antarctica population size population structure animal feeding Zoology QL1-991 |
spellingShingle |
hydrurga leptonyx pygoscelis papua lobodon carcinophagus antarctica population size population structure animal feeding Zoology QL1-991 Pavlo B. Khoyetskyy Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Antarctica) |
topic_facet |
hydrurga leptonyx pygoscelis papua lobodon carcinophagus antarctica population size population structure animal feeding Zoology QL1-991 |
description |
The state of the leopard seal population (Hydrurga leptonyx Blainville, 1828) in waters of the Argentine Islands was studied during the periods April 2015 — March 2016 and April 2018 — March 2019 according to the objectives of the State Target Scientific and Technical Research Programme of Ukraine in Antarctica for the period 2011–2020. During the study period, 14 males and 16 females were recorded within the archipelago (1M : 1.1F ratio). About 7 % of the seals were young individuals and more than 90% were adults. Leopard seals were recorded during all periods of the year. In the summer-autumn period, within the archipelago, there were 2 to 4 individuals simultaneously. The maximum period of stay of the predators in waters of the archipelago was about two weeks. Two individuals for at least two weeks were recorded twice in waters of the archipelago. The maximum period of absence of the seals in waters of the archipelago was 118 days. It was found that the occurrence of leopard seals and hence the traces of their life activities in various years were of different nature. In the autumn (April–May) of 2015, they were seen less frequently, on average every 6.3 ± 2.5 days, and in the autumn of 2018, on the contrary, more frequently, on average every 2.5 ± 0.5 days. The activity of the leopard seal in the winter (June, August) of 2015 decreased by half. It was recorded that the animals appeared in waters of the archipelago on average every 12.7 ± 5.5 days, and in the winter of 2018 — 5.5 ± 1.9 days. In the autumn of 2018, the predators and traces of their vital activities were seen less often — every 6.6 ± 1.6 days. During the study period, out of 78 recorded cases of the leopard seal’s occurrence, about 56 % of cases were recorded when they were on ice floes, in other cases (44 %) — when they were in water. In addition, several crabeater seals were recorded three times on an ice floe at an insignificant distance from a leopard seal. One of the main prey items for leopard seals within the archipelago are birds, in ... |
format |
Article in Journal/Newspaper |
author |
Pavlo B. Khoyetskyy |
author_facet |
Pavlo B. Khoyetskyy |
author_sort |
Pavlo B. Khoyetskyy |
title |
Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Antarctica) |
title_short |
Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Antarctica) |
title_full |
Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Antarctica) |
title_fullStr |
Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Antarctica) |
title_full_unstemmed |
Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Antarctica) |
title_sort |
monitoring of the leopard seal population (hydrurga leptonyx) in waters of the argentine islands (antarctica) |
publisher |
National Academy of Sciences of Ukraine. National Museum of Natural History |
publishDate |
2020 |
url |
https://doi.org/10.15407/TU1916 https://doaj.org/article/e3d2ec13311a4849be54f03a0c724582 |
long_lat |
ENVELOPE(-64.273,-64.273,-65.246,-65.246) ENVELOPE(-61.626,-61.626,-64.145,-64.145) |
geographic |
Argentine Argentine Islands Hydrurga |
geographic_facet |
Argentine Argentine Islands Hydrurga |
genre |
Antarc* Antarctica Argentine Islands Crabeater Seals Hydrurga leptonyx Leopard Seal Leopard Seals Lobodon carcinophagus Pygoscelis papua |
genre_facet |
Antarc* Antarctica Argentine Islands Crabeater Seals Hydrurga leptonyx Leopard Seal Leopard Seals Lobodon carcinophagus Pygoscelis papua |
op_source |
Theriologia Ukrainica, Vol 19, Pp 138-147 (2020) |
op_relation |
http://www.terioshkola.org.ua/library/pts19-dama/TU1916-khoyetskyy.htm https://doaj.org/toc/2616-7379 https://doaj.org/toc/2617-1120 doi:10.15407/TU1916 2616-7379 2617-1120 https://doaj.org/article/e3d2ec13311a4849be54f03a0c724582 |
op_doi |
https://doi.org/10.15407/TU1916 |
container_title |
Theriologia Ukrainica |
container_volume |
2020 |
container_issue |
19 |
container_start_page |
138 |
op_container_end_page |
147 |
_version_ |
1766253977959137280 |