Sex-age structure of pacific walrus <i>Odobenus rosmarus divergens</i> in the area of Cape Serdtse-Kamen’ (Chukchi Sea) in the summer-fall seasons of 2009-2014
Sex and age structure of pacific walruses on the shore rookeries at Cape Serdtse-Kamen’ is considered on the data of observations in 2009-2014. In total, sex and age were determined for 13766 walruses. Adult females were the largest sex-age group - 42.95 %, adult males were 21.48 %, young animals of...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | Russian |
| Published: |
Transactions of the Pacific Research Institute of Fisheries and Oceanography
2017-09-01
|
| Series: | Известия ТИНРО |
| Subjects: | |
| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/317 |
| _version_ | 1797700587920293888 |
|---|---|
| author | Maxim V. Chakilev Anatoly A. Kochnev |
| author_facet | Maxim V. Chakilev Anatoly A. Kochnev |
| author_sort | Maxim V. Chakilev |
| collection | DOAJ |
| description | Sex and age structure of pacific walruses on the shore rookeries at Cape Serdtse-Kamen’ is considered on the data of observations in 2009-2014. In total, sex and age were determined for 13766 walruses. Adult females were the largest sex-age group - 42.95 %, adult males were 21.48 %, young animals of 3-5 years old - 12.73 %, yearlings (1-) - 12.31 %, calves in the age 1+ - 5.95 %, and calves 2+ - 4.58 %. The portion of parous females was 28.67 % of the total number of mature females that is a sign of low population replenishment. Mortality rate of walruses in the first three years of their life is estimated. Taking into account that up to 80 % of the population was concentrated in the area of observations, the data represent authentically the current status of the pacific walrus population. |
| first_indexed | 2024-03-12T04:24:02Z |
| format | Article |
| id | doaj.art-7c0860e447a4479dabf4b0ccde83706a |
| institution | Directory Open Access Journal |
| issn | 1606-9919 2658-5510 |
| language | Russian |
| last_indexed | 2024-03-12T04:24:02Z |
| publishDate | 2017-09-01 |
| publisher | Transactions of the Pacific Research Institute of Fisheries and Oceanography |
| record_format | Article |
| series | Известия ТИНРО |
| spelling | doaj.art-7c0860e447a4479dabf4b0ccde83706a2023-09-03T10:32:16ZrusTransactions of the Pacific Research Institute of Fisheries and OceanographyИзвестия ТИНРО1606-99192658-55102017-09-011903727810.26428/1606-9919-2017-190-112-118315Sex-age structure of pacific walrus <i>Odobenus rosmarus divergens</i> in the area of Cape Serdtse-Kamen’ (Chukchi Sea) in the summer-fall seasons of 2009-2014Maxim V. Chakilev0Anatoly A. Kochnev1ЧукотНИО Тихоокеанского научно-исследовательского рыбохозяйственного центраИнститут биологических проблем Севера ДВО РАН; Национальный парк «Берингия»Sex and age structure of pacific walruses on the shore rookeries at Cape Serdtse-Kamen’ is considered on the data of observations in 2009-2014. In total, sex and age were determined for 13766 walruses. Adult females were the largest sex-age group - 42.95 %, adult males were 21.48 %, young animals of 3-5 years old - 12.73 %, yearlings (1-) - 12.31 %, calves in the age 1+ - 5.95 %, and calves 2+ - 4.58 %. The portion of parous females was 28.67 % of the total number of mature females that is a sign of low population replenishment. Mortality rate of walruses in the first three years of their life is estimated. Taking into account that up to 80 % of the population was concentrated in the area of observations, the data represent authentically the current status of the pacific walrus population.https://izvestiya.tinro-center.ru/jour/article/view/317тихоокеанский моржбереговое лежбищеполовозрастная структурачукотское моремыс сердце-каменьpacific walruscoastal rookerysex structureage structurechukchi seacape serdtse-kamen’ |
| spellingShingle | Maxim V. Chakilev Anatoly A. Kochnev Sex-age structure of pacific walrus <i>Odobenus rosmarus divergens</i> in the area of Cape Serdtse-Kamen’ (Chukchi Sea) in the summer-fall seasons of 2009-2014 Известия ТИНРО тихоокеанский морж береговое лежбище половозрастная структура чукотское море мыс сердце-камень pacific walrus coastal rookery sex structure age structure chukchi sea cape serdtse-kamen’ |
| title | Sex-age structure of pacific walrus <i>Odobenus rosmarus divergens</i> in the area of Cape Serdtse-Kamen’ (Chukchi Sea) in the summer-fall seasons of 2009-2014 |
| title_full | Sex-age structure of pacific walrus <i>Odobenus rosmarus divergens</i> in the area of Cape Serdtse-Kamen’ (Chukchi Sea) in the summer-fall seasons of 2009-2014 |
| title_fullStr | Sex-age structure of pacific walrus <i>Odobenus rosmarus divergens</i> in the area of Cape Serdtse-Kamen’ (Chukchi Sea) in the summer-fall seasons of 2009-2014 |
| title_full_unstemmed | Sex-age structure of pacific walrus <i>Odobenus rosmarus divergens</i> in the area of Cape Serdtse-Kamen’ (Chukchi Sea) in the summer-fall seasons of 2009-2014 |
| title_short | Sex-age structure of pacific walrus <i>Odobenus rosmarus divergens</i> in the area of Cape Serdtse-Kamen’ (Chukchi Sea) in the summer-fall seasons of 2009-2014 |
| title_sort | sex age structure of pacific walrus i odobenus rosmarus divergens i in the area of cape serdtse kamen chukchi sea in the summer fall seasons of 2009 2014 |
| topic | тихоокеанский морж береговое лежбище половозрастная структура чукотское море мыс сердце-камень pacific walrus coastal rookery sex structure age structure chukchi sea cape serdtse-kamen’ |
| url | https://izvestiya.tinro-center.ru/jour/article/view/317 |
| work_keys_str_mv | AT maximvchakilev sexagestructureofpacificwalrusiodobenusrosmarusdivergensiintheareaofcapeserdtsekamenchukchiseainthesummerfallseasonsof20092014 AT anatolyakochnev sexagestructureofpacificwalrusiodobenusrosmarusdivergensiintheareaofcapeserdtsekamenchukchiseainthesummerfallseasonsof20092014 |