Accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations
Abstract Increasing populations of mesopredators are suspected to cause declines in vulnerable wildlife to the extent that mesopredator decimation actions (culling) have become commonplace. Design constraints, especially a lack of spatial replication, often hamper the assessment of the impact of suc...
Published in: | Journal of Applied Ecology |
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Online Access: | http://dx.doi.org/10.1111/1365-2664.13793 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13793 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2664.13793 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13793 |
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crwiley:10.1111/1365-2664.13793 2024-06-02T08:02:04+00:00 Accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations Henden, John‐André Ehrich, Dorothee Soininen, Eeva M. Ims, Rolf A. Sales, Lilian Norges Forskningsråd 2020 http://dx.doi.org/10.1111/1365-2664.13793 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13793 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2664.13793 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13793 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Journal of Applied Ecology volume 58, issue 1, page 104-113 ISSN 0021-8901 1365-2664 journal-article 2020 crwiley https://doi.org/10.1111/1365-2664.13793 2024-05-03T11:12:53Z Abstract Increasing populations of mesopredators are suspected to cause declines in vulnerable wildlife to the extent that mesopredator decimation actions (culling) have become commonplace. Design constraints, especially a lack of spatial replication, often hamper the assessment of the impact of such actions. However, extensive temporal replication (i.e. time series) and accounting for potentially confounding variables may alleviate this problem. In alpine‐arctic tundra, the red fox Vulpes vulpes is increasing, while many bird species are declining, likely due to increased predation. Here, we assessed the impact of a long‐term (12‐year) and spatially extensive (~3,500 km 2 ) red fox culling action on the red‐listed willow ptarmigan Lagopus lagopus in the Norwegian Arctic. Ptarmigan populations were monitored annually in the impact area and in an adjacent no‐action area, including a 5‐year period before the action commenced. While logistical constraints prohibited monitoring of red fox population densities, the number of culled foxes and three influential food web covariates were monitored after the onset of the culling action. A Before‐After‐Control‐Impact‐Paired‐Series (BACIPS) analysis without food web covariates indicated that red fox culling curbed the decline of the population in the impact area, and that ptarmigan population density became ~25% higher than in the reference area. Spatially and temporally variable drivers within the food web confounded the simple BACIPS analysis. Accounting for three food web drivers as covariates in a linear mixed model after the onset of action, yielded a more unbiased impact estimate that amounted to ~40% higher ptarmigan population density (4.3 more ptarmigan/km 2 ) in the red fox impact area. Synthesis and applications . We provide the first evidence of the role of the recent expansion of red fox in the decline of bird populations in tundra. We also show that red fox culling may be able to curb such declines, given that management actions are large scale and long term. ... Article in Journal/Newspaper Arctic Tundra Wiley Online Library Arctic Journal of Applied Ecology 58 1 104 113 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Increasing populations of mesopredators are suspected to cause declines in vulnerable wildlife to the extent that mesopredator decimation actions (culling) have become commonplace. Design constraints, especially a lack of spatial replication, often hamper the assessment of the impact of such actions. However, extensive temporal replication (i.e. time series) and accounting for potentially confounding variables may alleviate this problem. In alpine‐arctic tundra, the red fox Vulpes vulpes is increasing, while many bird species are declining, likely due to increased predation. Here, we assessed the impact of a long‐term (12‐year) and spatially extensive (~3,500 km 2 ) red fox culling action on the red‐listed willow ptarmigan Lagopus lagopus in the Norwegian Arctic. Ptarmigan populations were monitored annually in the impact area and in an adjacent no‐action area, including a 5‐year period before the action commenced. While logistical constraints prohibited monitoring of red fox population densities, the number of culled foxes and three influential food web covariates were monitored after the onset of the culling action. A Before‐After‐Control‐Impact‐Paired‐Series (BACIPS) analysis without food web covariates indicated that red fox culling curbed the decline of the population in the impact area, and that ptarmigan population density became ~25% higher than in the reference area. Spatially and temporally variable drivers within the food web confounded the simple BACIPS analysis. Accounting for three food web drivers as covariates in a linear mixed model after the onset of action, yielded a more unbiased impact estimate that amounted to ~40% higher ptarmigan population density (4.3 more ptarmigan/km 2 ) in the red fox impact area. Synthesis and applications . We provide the first evidence of the role of the recent expansion of red fox in the decline of bird populations in tundra. We also show that red fox culling may be able to curb such declines, given that management actions are large scale and long term. ... |
author2 |
Sales, Lilian Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Henden, John‐André Ehrich, Dorothee Soininen, Eeva M. Ims, Rolf A. |
spellingShingle |
Henden, John‐André Ehrich, Dorothee Soininen, Eeva M. Ims, Rolf A. Accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations |
author_facet |
Henden, John‐André Ehrich, Dorothee Soininen, Eeva M. Ims, Rolf A. |
author_sort |
Henden, John‐André |
title |
Accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations |
title_short |
Accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations |
title_full |
Accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations |
title_fullStr |
Accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations |
title_full_unstemmed |
Accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations |
title_sort |
accounting for food web dynamics when assessing the impact of mesopredator control on declining prey populations |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1111/1365-2664.13793 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13793 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2664.13793 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.13793 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_source |
Journal of Applied Ecology volume 58, issue 1, page 104-113 ISSN 0021-8901 1365-2664 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/1365-2664.13793 |
container_title |
Journal of Applied Ecology |
container_volume |
58 |
container_issue |
1 |
container_start_page |
104 |
op_container_end_page |
113 |
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1800746566534823936 |