Demographic consequences of harvesting: a case study from a small and isolated moose population
ABSTRACT: Harvesting can have a substantial impact on population dynamics and individual performance in wild populations. While the direct consequences of harvest on individual survival and population growth rate are often apparent, harvesting can also have indirect and more subtle demographic conse...
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2977047 2023-05-15T17:43:34+02:00 Demographic consequences of harvesting: a case study from a small and isolated moose population Herfindal, Ivar Lee, Aline Magdalena Hamel, Sandra Solberg, Erling Johan Sæther, Bernt-Erik 2021 application/pdf https://hdl.handle.net/11250/2977047 https://doi.org/10.3354/cr01650 eng eng Inter Research Norges forskningsråd: 223257 Norges forskningsråd: 244647 Climate Research (CR). 2021, 86 53-64. urn:issn:0936-577X https://hdl.handle.net/11250/2977047 https://doi.org/10.3354/cr01650 cristin:1990906 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 53-64 86 Climate Research (CR) Peer reviewed Journal article 2021 ftntnutrondheimi https://doi.org/10.3354/cr01650 2022-02-09T23:38:20Z ABSTRACT: Harvesting can have a substantial impact on population dynamics and individual performance in wild populations. While the direct consequences of harvest on individual survival and population growth rate are often apparent, harvesting can also have indirect and more subtle demographic consequences. Disentangling these consequences, however, requires in-depth knowledge of individual life histories of both females and males in the population. Here, we summarise demographic research on a population where such data exist: the Vega moose population in northern Norway. In this population, vital rates vary considerably among both females and males, and harvesting increases this variation by generating positive covariation between reproductive performance and survival. The skewed age and sex structure, which is typical of many harvested populations, also has demographic consequences: it reduces the ratio of effective to total population size and influences variation in vital rates in males and females. The moose harvest at Vega is structured by age- and sex-specific quotas, but it is not intentionally selective regarding size or other phenotypic characteristics. Still, harvest selection for earlier birth rates and larger calves was apparent, likely due to habitat-performance relationships and habitat-specific harvest mortality. Together, the bulk of research on this population shows that harvesting impacts population demography through many different pathways, with some being more subtle than others. These complex pathways influence the demographic variance and affect stochastic processes such as population growth, genetic drift, and rates of evolutionary change, and they must therefore be acknowledged in management plans to achieve sustainable harvesting. publishedVersion Article in Journal/Newspaper Northern Norway NTNU Open Archive (Norwegian University of Science and Technology) Norway Climate Research 86 53 64 |
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Open Polar |
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NTNU Open Archive (Norwegian University of Science and Technology) |
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ftntnutrondheimi |
language |
English |
description |
ABSTRACT: Harvesting can have a substantial impact on population dynamics and individual performance in wild populations. While the direct consequences of harvest on individual survival and population growth rate are often apparent, harvesting can also have indirect and more subtle demographic consequences. Disentangling these consequences, however, requires in-depth knowledge of individual life histories of both females and males in the population. Here, we summarise demographic research on a population where such data exist: the Vega moose population in northern Norway. In this population, vital rates vary considerably among both females and males, and harvesting increases this variation by generating positive covariation between reproductive performance and survival. The skewed age and sex structure, which is typical of many harvested populations, also has demographic consequences: it reduces the ratio of effective to total population size and influences variation in vital rates in males and females. The moose harvest at Vega is structured by age- and sex-specific quotas, but it is not intentionally selective regarding size or other phenotypic characteristics. Still, harvest selection for earlier birth rates and larger calves was apparent, likely due to habitat-performance relationships and habitat-specific harvest mortality. Together, the bulk of research on this population shows that harvesting impacts population demography through many different pathways, with some being more subtle than others. These complex pathways influence the demographic variance and affect stochastic processes such as population growth, genetic drift, and rates of evolutionary change, and they must therefore be acknowledged in management plans to achieve sustainable harvesting. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Herfindal, Ivar Lee, Aline Magdalena Hamel, Sandra Solberg, Erling Johan Sæther, Bernt-Erik |
spellingShingle |
Herfindal, Ivar Lee, Aline Magdalena Hamel, Sandra Solberg, Erling Johan Sæther, Bernt-Erik Demographic consequences of harvesting: a case study from a small and isolated moose population |
author_facet |
Herfindal, Ivar Lee, Aline Magdalena Hamel, Sandra Solberg, Erling Johan Sæther, Bernt-Erik |
author_sort |
Herfindal, Ivar |
title |
Demographic consequences of harvesting: a case study from a small and isolated moose population |
title_short |
Demographic consequences of harvesting: a case study from a small and isolated moose population |
title_full |
Demographic consequences of harvesting: a case study from a small and isolated moose population |
title_fullStr |
Demographic consequences of harvesting: a case study from a small and isolated moose population |
title_full_unstemmed |
Demographic consequences of harvesting: a case study from a small and isolated moose population |
title_sort |
demographic consequences of harvesting: a case study from a small and isolated moose population |
publisher |
Inter Research |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2977047 https://doi.org/10.3354/cr01650 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
53-64 86 Climate Research (CR) |
op_relation |
Norges forskningsråd: 223257 Norges forskningsråd: 244647 Climate Research (CR). 2021, 86 53-64. urn:issn:0936-577X https://hdl.handle.net/11250/2977047 https://doi.org/10.3354/cr01650 cristin:1990906 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3354/cr01650 |
container_title |
Climate Research |
container_volume |
86 |
container_start_page |
53 |
op_container_end_page |
64 |
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1766145667448700928 |