Predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates
International audience The consequences of cyclic fluctuations in abundance of prey species on predator continue to improve our understanding of the mechanisms behind population regulation. Among predators, vole-eating raptors usually respond to changes in prey abundance with no apparent time-lag an...
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ftunivnantes:oai:HAL:hal-00323847v1 2023-05-15T15:56:38+02:00 Predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates Millon, Alexandre Bretagnolle, Vincent Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Department of Zoology University of Aberdeen 2008-09-23 https://hal.science/hal-00323847 https://doi.org/10.1111/j.2008.0030-1299.16458.x en eng HAL CCSD Nordic Ecological Society info:eu-repo/semantics/altIdentifier/doi/10.1111/j.2008.0030-1299.16458.x, hal-00323847 https://hal.science/hal-00323847 doi:10.1111/j.2008.0030-1299.16458.x ISSN: 0030-1299 EISSN: 1600-0706 Oikos https://hal.science/hal-00323847 Oikos, 2008, 117, pp.1500-1510. ⟨10.1111/j.2008.0030-1299.16458.x,⟩ [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2008 ftunivnantes https://doi.org/10.1111/j.2008.0030-1299.16458.x https://doi.org/10.1111/j.2008.0030-1299.16458.x, 2023-02-08T04:31:40Z International audience The consequences of cyclic fluctuations in abundance of prey species on predator continue to improve our understanding of the mechanisms behind population regulation. Among predators, vole-eating raptors usually respond to changes in prey abundance with no apparent time-lag and therefore contradict predictions from the predatorprey theory. In such systems, the interplay between demographic traits and population growth rate in relation to prey abundance remains poorly studied, yet it is crucial to characterize the link between ecological processes and population changes. Using a mechanistic approach, we assessed the demographic rates associated to the direct and indirect numerical responses of a specialist raptor (Montagu's harrier) to its cyclic prey (common vole), using long term data from two adjacent study sites in France. First-year survival rates were weakly affected by vole abundance, probably due to the fact that Montagu's harriers are trans-Saharan migrants and thus escape the vole collapse occurring in autumnwinter. Recruitment of yearling as well as breeding propensity of experienced adult females were strongly affected by vole abundance and at least partially shaped the trajectory of the breeding population. We argued that the strong density dependent signal detected in predator time series was mostly the phenomenological consequence of the positive direct numerical response of harriers to vole abundance. Accounting for this, we proposed a method to assess density dependence in predator relying on a cyclic prey. Finally, the variation in Montagu's harrier population growth rates was best explained by overwinter growth rates of the prey population and to a lesser extent by previous residual predator density. Article in Journal/Newspaper Common vole Université de Nantes: HAL-UNIV-NANTES |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes |
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[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes Millon, Alexandre Bretagnolle, Vincent Predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The consequences of cyclic fluctuations in abundance of prey species on predator continue to improve our understanding of the mechanisms behind population regulation. Among predators, vole-eating raptors usually respond to changes in prey abundance with no apparent time-lag and therefore contradict predictions from the predatorprey theory. In such systems, the interplay between demographic traits and population growth rate in relation to prey abundance remains poorly studied, yet it is crucial to characterize the link between ecological processes and population changes. Using a mechanistic approach, we assessed the demographic rates associated to the direct and indirect numerical responses of a specialist raptor (Montagu's harrier) to its cyclic prey (common vole), using long term data from two adjacent study sites in France. First-year survival rates were weakly affected by vole abundance, probably due to the fact that Montagu's harriers are trans-Saharan migrants and thus escape the vole collapse occurring in autumnwinter. Recruitment of yearling as well as breeding propensity of experienced adult females were strongly affected by vole abundance and at least partially shaped the trajectory of the breeding population. We argued that the strong density dependent signal detected in predator time series was mostly the phenomenological consequence of the positive direct numerical response of harriers to vole abundance. Accounting for this, we proposed a method to assess density dependence in predator relying on a cyclic prey. Finally, the variation in Montagu's harrier population growth rates was best explained by overwinter growth rates of the prey population and to a lesser extent by previous residual predator density. |
author2 |
Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Department of Zoology University of Aberdeen |
format |
Article in Journal/Newspaper |
author |
Millon, Alexandre Bretagnolle, Vincent |
author_facet |
Millon, Alexandre Bretagnolle, Vincent |
author_sort |
Millon, Alexandre |
title |
Predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates |
title_short |
Predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates |
title_full |
Predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates |
title_fullStr |
Predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates |
title_full_unstemmed |
Predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates |
title_sort |
predator population dynamics under a cyclic prey regime: numerical responses, demographic parameters and growth rates |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00323847 https://doi.org/10.1111/j.2008.0030-1299.16458.x |
genre |
Common vole |
genre_facet |
Common vole |
op_source |
ISSN: 0030-1299 EISSN: 1600-0706 Oikos https://hal.science/hal-00323847 Oikos, 2008, 117, pp.1500-1510. ⟨10.1111/j.2008.0030-1299.16458.x,⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.2008.0030-1299.16458.x, hal-00323847 https://hal.science/hal-00323847 doi:10.1111/j.2008.0030-1299.16458.x |
op_doi |
https://doi.org/10.1111/j.2008.0030-1299.16458.x https://doi.org/10.1111/j.2008.0030-1299.16458.x, |
_version_ |
1766392025461030912 |