The Harvest Effect on Dynamics of Northern Fur Seal Population: Mathematical Modeling and Data Analysis Results
We examine population trends in light of male harvest data considering the long-time series of population data on northern fur seals at Tyuleniy Island. To answer the question has the way males were harvested influenced the population trajectory, we analyzed the visual harem size and birth rate dyna...
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ftmdpi:oai:mdpi.com:/2227-7390/10/17/3067/ 2023-08-20T04:10:25+02:00 The Harvest Effect on Dynamics of Northern Fur Seal Population: Mathematical Modeling and Data Analysis Results Oksana Zhdanova Alexey Kuzin Efim Frisman 2022-08-25 application/pdf https://doi.org/10.3390/math10173067 EN eng Multidisciplinary Digital Publishing Institute Mathematical Biology https://dx.doi.org/10.3390/math10173067 https://creativecommons.org/licenses/by/4.0/ Mathematics; Volume 10; Issue 17; Pages: 3067 Callorhinus ursinus matrix population model harvest conservation growth rate Text 2022 ftmdpi https://doi.org/10.3390/math10173067 2023-08-01T06:13:04Z We examine population trends in light of male harvest data considering the long-time series of population data on northern fur seals at Tyuleniy Island. To answer the question has the way males were harvested influenced the population trajectory, we analyzed the visual harem size and birth rate dynamics of the population, as well as the strategy and intensity of the harvest. We analyzed the dynamics of the sex ratio in the early (1958–1988) period to estimate parameters in the late period (1989–2013) based on the observed number of bulls and pups, while utilizing the distribution of reproductive rates obtained from pelagic sealing. Using a matrix population model for the observed part of the population (i.e., the male population), we analyzed the population growth rate associated with changes in both birth and survival rates considering the stochastic effects. Observations allow us to reject the hypothesis of nonselective harvest. Among the variety of natural and anthropogenic factors that could contribute to the decrease in the birth rate in the population, the effect of selective harvesting seems to be the most realistic. Text Callorhinus ursinus Northern fur seal MDPI Open Access Publishing Mathematics 10 17 3067 |
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Callorhinus ursinus matrix population model harvest conservation growth rate |
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Callorhinus ursinus matrix population model harvest conservation growth rate Oksana Zhdanova Alexey Kuzin Efim Frisman The Harvest Effect on Dynamics of Northern Fur Seal Population: Mathematical Modeling and Data Analysis Results |
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Callorhinus ursinus matrix population model harvest conservation growth rate |
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We examine population trends in light of male harvest data considering the long-time series of population data on northern fur seals at Tyuleniy Island. To answer the question has the way males were harvested influenced the population trajectory, we analyzed the visual harem size and birth rate dynamics of the population, as well as the strategy and intensity of the harvest. We analyzed the dynamics of the sex ratio in the early (1958–1988) period to estimate parameters in the late period (1989–2013) based on the observed number of bulls and pups, while utilizing the distribution of reproductive rates obtained from pelagic sealing. Using a matrix population model for the observed part of the population (i.e., the male population), we analyzed the population growth rate associated with changes in both birth and survival rates considering the stochastic effects. Observations allow us to reject the hypothesis of nonselective harvest. Among the variety of natural and anthropogenic factors that could contribute to the decrease in the birth rate in the population, the effect of selective harvesting seems to be the most realistic. |
format |
Text |
author |
Oksana Zhdanova Alexey Kuzin Efim Frisman |
author_facet |
Oksana Zhdanova Alexey Kuzin Efim Frisman |
author_sort |
Oksana Zhdanova |
title |
The Harvest Effect on Dynamics of Northern Fur Seal Population: Mathematical Modeling and Data Analysis Results |
title_short |
The Harvest Effect on Dynamics of Northern Fur Seal Population: Mathematical Modeling and Data Analysis Results |
title_full |
The Harvest Effect on Dynamics of Northern Fur Seal Population: Mathematical Modeling and Data Analysis Results |
title_fullStr |
The Harvest Effect on Dynamics of Northern Fur Seal Population: Mathematical Modeling and Data Analysis Results |
title_full_unstemmed |
The Harvest Effect on Dynamics of Northern Fur Seal Population: Mathematical Modeling and Data Analysis Results |
title_sort |
harvest effect on dynamics of northern fur seal population: mathematical modeling and data analysis results |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/math10173067 |
genre |
Callorhinus ursinus Northern fur seal |
genre_facet |
Callorhinus ursinus Northern fur seal |
op_source |
Mathematics; Volume 10; Issue 17; Pages: 3067 |
op_relation |
Mathematical Biology https://dx.doi.org/10.3390/math10173067 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/math10173067 |
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Mathematics |
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10 |
container_issue |
17 |
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3067 |
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1774724594708512768 |