Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima
International audience Harvested species population dynamics are shaped by the relative contribution of natural and harvest mortality. Natural mortality is usually not under management control, so managers must continuously adjust harvest rates to prevent overexploitation. Ideally, this requires reg...
Published in: | Ecology and Evolution |
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Main Authors: | , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://hal.science/hal-02281252 https://hal.science/hal-02281252v2/document https://hal.science/hal-02281252v2/file/Tjornlov%202019.pdf https://doi.org/10.1002/ece3.5707 |
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ftunivnantes:oai:HAL:hal-02281252v2 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
population dynamics sex ratio CMR modelling demography hunting bag statistics multi-event model prospective population scenarios [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology |
spellingShingle |
population dynamics sex ratio CMR modelling demography hunting bag statistics multi-event model prospective population scenarios [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology Tjørnløv, Rune S. Pradel, Roger Choquet, Remi Christensen, Thomas Kjaer Frederiksen, Morten Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima |
topic_facet |
population dynamics sex ratio CMR modelling demography hunting bag statistics multi-event model prospective population scenarios [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology |
description |
International audience Harvested species population dynamics are shaped by the relative contribution of natural and harvest mortality. Natural mortality is usually not under management control, so managers must continuously adjust harvest rates to prevent overexploitation. Ideally, this requires regular assessment of the contribution of harvest to total mortality and how this affects population dynamics.To assess the impact of hunting mortality on the dynamics of the rapidly declining Baltic/Wadden Sea population of common eiders Somateria mollissima, we first estimated vital rates of ten study colonies over the period 1970-2015. By means of a multi-event capture-recovery model, we then used the cause of death of recovered individuals to estimate proportions of adult females that died due to hunting or other causes. Finally, we adopted a stochastic matrix population modeling approach based on simulations to investigate the effect of past and present harvest regulations on changes in flyway population size and composition.Results showed that even the complete ban on shooting females implemented in 2014 in Denmark, where most hunting takes place, was not enough to stop the population decline given current levels of natural female mortality. Despite continued hunting of males, our predictions suggest that the proportion of females will continue to decline unless natural mortality of the females is reduced.Although levels of natural mortality must decrease to halt the decline of this population, we advocate that the current hunting ban on females is maintained while further investigations of factors causing increased levels of natural mortality among females are undertaken. Synthesis and applications. At the flyway scale, continuous and accurate estimates of vital rates and the relative contribution of harvest versus other mortality causes are increasingly important as the population effect of adjusting harvest rates is most effectively evaluated within a model-based adaptive management framework. |
author2 |
Aarhus University Aarhus Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud )-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) |
format |
Article in Journal/Newspaper |
author |
Tjørnløv, Rune S. Pradel, Roger Choquet, Remi Christensen, Thomas Kjaer Frederiksen, Morten |
author_facet |
Tjørnløv, Rune S. Pradel, Roger Choquet, Remi Christensen, Thomas Kjaer Frederiksen, Morten |
author_sort |
Tjørnløv, Rune S. |
title |
Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima |
title_short |
Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima |
title_full |
Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima |
title_fullStr |
Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima |
title_full_unstemmed |
Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima |
title_sort |
consequences of past and present harvest management in a declining flyway population of common eiders somateria mollissima |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02281252 https://hal.science/hal-02281252v2/document https://hal.science/hal-02281252v2/file/Tjornlov%202019.pdf https://doi.org/10.1002/ece3.5707 |
genre |
Somateria mollissima |
genre_facet |
Somateria mollissima |
op_source |
ISSN: 2045-7758 Ecology and Evolution https://hal.science/hal-02281252 Ecology and Evolution, 2019, 9 (22), pp.12515-12530. ⟨10.1002/ece3.5707⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.5707 info:eu-repo/semantics/altIdentifier/pmid/31788194 hal-02281252 https://hal.science/hal-02281252 https://hal.science/hal-02281252v2/document https://hal.science/hal-02281252v2/file/Tjornlov%202019.pdf doi:10.1002/ece3.5707 PUBMED: 31788194 PUBMEDCENTRAL: PMC6875579 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/ece3.5707 |
container_title |
Ecology and Evolution |
container_volume |
9 |
container_issue |
22 |
container_start_page |
12515 |
op_container_end_page |
12530 |
_version_ |
1766197956564746240 |
spelling |
ftunivnantes:oai:HAL:hal-02281252v2 2023-05-15T18:20:26+02:00 Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima Tjørnløv, Rune S. Pradel, Roger Choquet, Remi Christensen, Thomas Kjaer Frederiksen, Morten Aarhus University Aarhus Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud )-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) 2019 https://hal.science/hal-02281252 https://hal.science/hal-02281252v2/document https://hal.science/hal-02281252v2/file/Tjornlov%202019.pdf https://doi.org/10.1002/ece3.5707 en eng HAL CCSD Wiley Open Access info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.5707 info:eu-repo/semantics/altIdentifier/pmid/31788194 hal-02281252 https://hal.science/hal-02281252 https://hal.science/hal-02281252v2/document https://hal.science/hal-02281252v2/file/Tjornlov%202019.pdf doi:10.1002/ece3.5707 PUBMED: 31788194 PUBMEDCENTRAL: PMC6875579 info:eu-repo/semantics/OpenAccess ISSN: 2045-7758 Ecology and Evolution https://hal.science/hal-02281252 Ecology and Evolution, 2019, 9 (22), pp.12515-12530. ⟨10.1002/ece3.5707⟩ population dynamics sex ratio CMR modelling demography hunting bag statistics multi-event model prospective population scenarios [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology info:eu-repo/semantics/article Journal articles 2019 ftunivnantes https://doi.org/10.1002/ece3.5707 2023-03-01T03:03:30Z International audience Harvested species population dynamics are shaped by the relative contribution of natural and harvest mortality. Natural mortality is usually not under management control, so managers must continuously adjust harvest rates to prevent overexploitation. Ideally, this requires regular assessment of the contribution of harvest to total mortality and how this affects population dynamics.To assess the impact of hunting mortality on the dynamics of the rapidly declining Baltic/Wadden Sea population of common eiders Somateria mollissima, we first estimated vital rates of ten study colonies over the period 1970-2015. By means of a multi-event capture-recovery model, we then used the cause of death of recovered individuals to estimate proportions of adult females that died due to hunting or other causes. Finally, we adopted a stochastic matrix population modeling approach based on simulations to investigate the effect of past and present harvest regulations on changes in flyway population size and composition.Results showed that even the complete ban on shooting females implemented in 2014 in Denmark, where most hunting takes place, was not enough to stop the population decline given current levels of natural female mortality. Despite continued hunting of males, our predictions suggest that the proportion of females will continue to decline unless natural mortality of the females is reduced.Although levels of natural mortality must decrease to halt the decline of this population, we advocate that the current hunting ban on females is maintained while further investigations of factors causing increased levels of natural mortality among females are undertaken. Synthesis and applications. At the flyway scale, continuous and accurate estimates of vital rates and the relative contribution of harvest versus other mortality causes are increasingly important as the population effect of adjusting harvest rates is most effectively evaluated within a model-based adaptive management framework. Article in Journal/Newspaper Somateria mollissima Université de Nantes: HAL-UNIV-NANTES Ecology and Evolution 9 22 12515 12530 |