The unexplored maternity dens survey of the polar bear (Ursus maritimus) on Wrangel and Herald islands in 1982
In March–May 1982, a local expedition worked in the Arctic, in the east of Wrangel Island (WI) and Herald Island (HI), to carry out a survey of polar bear dens. The results of that expedition have not been published. The author has found a copy manuscript of the expedition diary in Kyiv and has high...
Published in: | Theriologia Ukrainica |
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National Academy of Sciences of Ukraine. National Museum of Natural History
2022
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Online Access: | https://doi.org/10.15407/TU2416 https://doaj.org/article/4a3fff3c6b6449268ccdd9e42c6fc9a6 |
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ftdoajarticles:oai:doaj.org/article:4a3fff3c6b6449268ccdd9e42c6fc9a6 2023-05-15T15:19:05+02:00 The unexplored maternity dens survey of the polar bear (Ursus maritimus) on Wrangel and Herald islands in 1982 Vasyl Prydatko-Dolin 2022-12-01T00:00:00Z https://doi.org/10.15407/TU2416 https://doaj.org/article/4a3fff3c6b6449268ccdd9e42c6fc9a6 EN UK eng ukr National Academy of Sciences of Ukraine. National Museum of Natural History http://terioshkola.org.ua/library/pts24/TU2416-prydatko.htm https://doaj.org/toc/2616-7379 https://doaj.org/toc/2617-1120 doi:10.15407/TU2416 2616-7379 2617-1120 https://doaj.org/article/4a3fff3c6b6449268ccdd9e42c6fc9a6 Theriologia Ukrainica, Vol 24, Pp 184-209 (2022) polar bear wrangel island herald island maternity dens 3d-model Zoology QL1-991 article 2022 ftdoajarticles https://doi.org/10.15407/TU2416 2023-02-12T01:30:55Z In March–May 1982, a local expedition worked in the Arctic, in the east of Wrangel Island (WI) and Herald Island (HI), to carry out a survey of polar bear dens. The results of that expedition have not been published. The author has found a copy manuscript of the expedition diary in Kyiv and has highlighted the key results. For two months, five explorers had been surveying the area and found 139 dens and sighted 57 bears (+ad + juv). The average number of offspring (ANO) was 1.43 on WI and 1.86 on HI. The number of successful offspring on WI usually was one or two cubs, or even three on HI. Based on the available sample (n=44) it was shown that when taking into account the survey data of cub traces in calculations of ANO (on WI), the obtained results do not differ notable. The time that lasted from the date of the opening of the den to the date of the final leave of the den by females (with or without the young) was 4 to 14 days, but most often 6 days. The highest frequency of den opening was noted on 27–28 March. Four cases of death of cubs, including a newborn, were recorded. The fate of 43 dens was monitored and measurements of 11 dens were taken. Two unusual dens were found: one with a very complex corridor and another one with a 4.5 m long vertical tunnel. Simplified 3D models of dens were given in the article for the first time proving that linear measurements practiced by researchers give a primitive picture of the den structure. After leaving the maternity den, the female can build temporary, simple shelter for herself and the young. During 1964–2020, dens were found on these islands only on the ground, and in 1980 the author found several dens on the sea, among ridges of pressured ice. The article is amended by the author’s estimations regarding the place of the polar bear in ecological pyramid of those islands. Recommendations are given for the improvement of polar bear survey techniques. The publication of a Ukrainian language article on the biology of U. maritimus is rare for the school of Ukrainian ... Article in Journal/Newspaper Arctic Herald Island Ursus maritimus Wrangel Island Directory of Open Access Journals: DOAJ Articles Arctic Wrangel Island ENVELOPE(-179.385,-179.385,71.244,71.244) Pyramid ENVELOPE(157.300,157.300,-81.333,-81.333) Herald Island ENVELOPE(-175.637,-175.637,71.378,71.378) Juv ENVELOPE(20.153,20.153,69.428,69.428) Theriologia Ukrainica 2022 24 184 209 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Ukrainian |
topic |
polar bear wrangel island herald island maternity dens 3d-model Zoology QL1-991 |
spellingShingle |
polar bear wrangel island herald island maternity dens 3d-model Zoology QL1-991 Vasyl Prydatko-Dolin The unexplored maternity dens survey of the polar bear (Ursus maritimus) on Wrangel and Herald islands in 1982 |
topic_facet |
polar bear wrangel island herald island maternity dens 3d-model Zoology QL1-991 |
description |
In March–May 1982, a local expedition worked in the Arctic, in the east of Wrangel Island (WI) and Herald Island (HI), to carry out a survey of polar bear dens. The results of that expedition have not been published. The author has found a copy manuscript of the expedition diary in Kyiv and has highlighted the key results. For two months, five explorers had been surveying the area and found 139 dens and sighted 57 bears (+ad + juv). The average number of offspring (ANO) was 1.43 on WI and 1.86 on HI. The number of successful offspring on WI usually was one or two cubs, or even three on HI. Based on the available sample (n=44) it was shown that when taking into account the survey data of cub traces in calculations of ANO (on WI), the obtained results do not differ notable. The time that lasted from the date of the opening of the den to the date of the final leave of the den by females (with or without the young) was 4 to 14 days, but most often 6 days. The highest frequency of den opening was noted on 27–28 March. Four cases of death of cubs, including a newborn, were recorded. The fate of 43 dens was monitored and measurements of 11 dens were taken. Two unusual dens were found: one with a very complex corridor and another one with a 4.5 m long vertical tunnel. Simplified 3D models of dens were given in the article for the first time proving that linear measurements practiced by researchers give a primitive picture of the den structure. After leaving the maternity den, the female can build temporary, simple shelter for herself and the young. During 1964–2020, dens were found on these islands only on the ground, and in 1980 the author found several dens on the sea, among ridges of pressured ice. The article is amended by the author’s estimations regarding the place of the polar bear in ecological pyramid of those islands. Recommendations are given for the improvement of polar bear survey techniques. The publication of a Ukrainian language article on the biology of U. maritimus is rare for the school of Ukrainian ... |
format |
Article in Journal/Newspaper |
author |
Vasyl Prydatko-Dolin |
author_facet |
Vasyl Prydatko-Dolin |
author_sort |
Vasyl Prydatko-Dolin |
title |
The unexplored maternity dens survey of the polar bear (Ursus maritimus) on Wrangel and Herald islands in 1982 |
title_short |
The unexplored maternity dens survey of the polar bear (Ursus maritimus) on Wrangel and Herald islands in 1982 |
title_full |
The unexplored maternity dens survey of the polar bear (Ursus maritimus) on Wrangel and Herald islands in 1982 |
title_fullStr |
The unexplored maternity dens survey of the polar bear (Ursus maritimus) on Wrangel and Herald islands in 1982 |
title_full_unstemmed |
The unexplored maternity dens survey of the polar bear (Ursus maritimus) on Wrangel and Herald islands in 1982 |
title_sort |
unexplored maternity dens survey of the polar bear (ursus maritimus) on wrangel and herald islands in 1982 |
publisher |
National Academy of Sciences of Ukraine. National Museum of Natural History |
publishDate |
2022 |
url |
https://doi.org/10.15407/TU2416 https://doaj.org/article/4a3fff3c6b6449268ccdd9e42c6fc9a6 |
long_lat |
ENVELOPE(-179.385,-179.385,71.244,71.244) ENVELOPE(157.300,157.300,-81.333,-81.333) ENVELOPE(-175.637,-175.637,71.378,71.378) ENVELOPE(20.153,20.153,69.428,69.428) |
geographic |
Arctic Wrangel Island Pyramid Herald Island Juv |
geographic_facet |
Arctic Wrangel Island Pyramid Herald Island Juv |
genre |
Arctic Herald Island Ursus maritimus Wrangel Island |
genre_facet |
Arctic Herald Island Ursus maritimus Wrangel Island |
op_source |
Theriologia Ukrainica, Vol 24, Pp 184-209 (2022) |
op_relation |
http://terioshkola.org.ua/library/pts24/TU2416-prydatko.htm https://doaj.org/toc/2616-7379 https://doaj.org/toc/2617-1120 doi:10.15407/TU2416 2616-7379 2617-1120 https://doaj.org/article/4a3fff3c6b6449268ccdd9e42c6fc9a6 |
op_doi |
https://doi.org/10.15407/TU2416 |
container_title |
Theriologia Ukrainica |
container_volume |
2022 |
container_issue |
24 |
container_start_page |
184 |
op_container_end_page |
209 |
_version_ |
1766349265186062336 |