The feeding peculiarities of the Antarctic seals in the region of the Argentina Islands Archipelago

Dykyy, I.

doi:10.33275/1727-7485.8.2009.458

Cited by 3 publications

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“…It was found that the females with pups identified near the Black Island and the Leopard Island had not been previously encountered in the archipelago waters. In general, in the waters of Black and Leopard islands, out of 8 females five gave birth to pups in the third decade of September (families 13,14,27,28,31). Overall, in the third decade of September, more than 40 % of all newborn seals were recorded (Fig.…”

Section: P B Khoyetskyymentioning

confidence: 97%

“…At the beginning of the 21st century, the Weddell seals biology studies was continued by scientists from different countries (Cameron and Siniff, 2004 The biologists conducted substantial research on biotic diversity of the Argentine Islands and adjacent territories of the Antarctic Peninsula (Graham Land) during 1996-2016 at the Ukrainian Akademik Ver nadsky station. Hovewer, the Weddell seals biology and ecology had not received a proper attention (Dykyy et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Publications by Ukrainian scientists were concerned with daily and seasonal migrations, the peculiarities of the growth of young We ddell seals, the feeding of Antarctic species of seals, etc. (Dykyy, Drongovska, 2015;Dykyy, 2009; Dy kyy, 2012; Dykyy, Drongovska, 2015; Drongovska, Dykyy, 2016; Dykyy, Salganskiy, 2013; Salganskiy, Dykyy, 2013). However, the study of the features of Weddell seals breeding in the Graham Land of the Antarctic Peninsula is absent.…”

Section: Introductionmentioning

confidence: 99%

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The Reproduction of the Weddell Seal Leptonychotes weddellii (Phosidae) in the Waters of the Argentine Islands Archipelago

Khoyetskyy

2019

UAJ

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Objective. The study of Leptonychotes weddellii (Phocidae) reproduction in the waters of the Argentine Islands archipelago. Methods. The inventory of Weddell seals was carried out on the islands of the archipelago by the route method with an inspection of the places where seals are likely to be located. Moving to the islands, depending on the ice situation, the weather conditions, was carried out on the sea ice or using a boat. The identification of L. weddellii was carried out in accordance with common methods. Results. In September-October 2015, in the waters of the Argentine Islands archipelago, five breeding sites of L. weddellii were revealed. At the first site (the Three Little Pigs Islands), five parturition cases were identified, at the second one (near the old English station), the births of 4 seal pups were recorded, at the third one (the Forge Islands) -4 pups, at the fourth one (the Black -Leopard Islands) -8 pups, and at the fifth breeding site (Grotto -Corner -Uruguay Islands) -11 seal pups. The sixth site was probably the Barchans Islands. During the period of the study, over 76 % of the female seals with offspring and about 24 % without seal pups were recorded. Observations indicate that females swim in advance into the water of the archipelago for further reproduction. It was found that in six females parturitions occurred a day after their appearance on the island's shore or the ice cover, some females brought pups four, six and seven days later. During September -October 2015 more than 50 % of females gave birth to pups on the ice cover, but at the distance which did not exceed 10-15 m from the shore. The births of pups at a considerable distance from the shores of the island were recorded rarely. Conclusions. In the spring of 2015, the first female seal at birth was recorded in early September, the last one -in the second ten-day period of October, the maximum number of parturition cases was found in the third ten-day period of September. The breeding period lasted 38 days. There were recorded 32 female seals that gave birth to 18 male pups and 14 female pups. The number of seal pups was higher than in previous years, there was no postnatal mortality and no mortality of young animals was recorded. Our studies provide an opportunity to estimate the size and structure of the species population in the waters of the Argentine Islands archipelago. However, some issues of Weddell seals biology in the period of breeding need further study, in particular: spatial-temporal distribution, emigration and immigration processes in the area of the archipelago, which are related to the ice situation, the availability of feed and reproduction.

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Section: P B Khoyetskyymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Reproduction of the Weddell Seal Leptonychotes weddellii (Phosidae) in the Waters of the Argentine Islands Archipelago

Khoyetskyy

2019

UAJ

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Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Ant-arctica)

Khoyetskyy¹

2020

Theriol. Ukr.

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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 particular the gentoo penguin (Pygoscelis papua), as well as crabeater seals (Lobodon carcinophagus). The presence of two penguin colonies on Galindez Island attracts leopard seals to the archipelago. During the study period, successful leopard seal predation on penguins was recorded more than 20 times. Penguins were the most frequent prey of leopard seals in spring and summer, while crabeater seals in winter.

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The status of the fur seal population (Arctocephalus gazelle) on the southern border of the distribution area (the Argentine Islands archipelago)

Khoyetskyy¹

2021

Theriol. Ukr.

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The study of the population status of Arctocephalus gazella (Peters, 1875) in waters of the Argentine Islands was carried out in the period from April 2015 to March 2016 in accordance with the objectives of the State Target Scientific and Technical Research Program of Ukraine in Antarctica for 2011–2020. The aim of the article is to study the population dynamics and distribution of the southern fur seal in waters of the Argentine Islands. Due to the lack of data on the specifics of the seal’s dispersal in different periods of the year and the dynamics of the species population at the southern border of the distribution range, the results of the research are relevant and of great importance. In the second half of the 20th century, some publications presented the results of monitoring of pinnipeds at the Argentine Islands and adjacent territories, but the objects of these studies usually were other seal species: Hydrurga leptonyx, Lobodon carcinophagus, Leptonychotes weddelli, and Mirounga leonina. In the early 21st century, monitoring of the fauna of the Argentine Islands was carried out by Ukrainian biologists. However, they focused on Leptonychotes weddelli and less on other species of pinnipeds. The field material was collected in waters of the Argentine Islands, which is located in the Pacific sector of Antarctica. The fur seal population census and distribution studies were conducted according to the generally accepted methods. After breeding season on the subantarctic islands, during the migration southwards, fur seals reach the Argentine Islands, usually in the third decade of January. In the summer of 2016, the first fur seal was recorded within the archipelago on 31 January. During the study period, the largest number of animals within the archipelago was recorded in March–April and it ranged from 300 to 400 individuals. On the islands of the archipelago, the main resting places of seals were identified. The movement of animals northwards starts in May, consequently a decrease in the number of animals in this region is observed at that time. The last individuals are recorded in the first half of August. In 2015, migration began in May and ended in early August. There are several periods that were characterized by intensive migration of the animals: late June, 5–8 July, and 29 July to 6 August. In winter, one individual was last found within the archipelago on 12 August. The migration is launched by the worsening of weather conditions, formation of a continuous ice cover, reduced availability of food, and other factors.

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The feeding peculiarities of the Antarctic seals in the region of the Argentina Islands Archipelago

Cited by 3 publications

References 0 publications

The Reproduction of the Weddell Seal Leptonychotes weddellii (Phosidae) in the Waters of the Argentine Islands Archipelago

The Reproduction of the Weddell Seal Leptonychotes weddellii (Phosidae) in the Waters of the Argentine Islands Archipelago

Monitoring of the leopard seal population (Hydrurga leptonyx) in waters of the Argentine Islands (Ant-arctica)

The status of the fur seal population (Arctocephalus gazelle) on the southern border of the distribution area (the Argentine Islands archipelago)

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