Density-dependent reproduction causes winter crashes in a common vole population

International audience Common voles in western France exhibit threeyearpopulation cycles with winter crashes after largeoutbreaks. During the winter of 2011–2012, we monitoredsurvival, reproduction, recruitment and population growthrate of common voles at different densities (from low tooutbreak den...

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Bibliographic Details
Published in:Population Ecology
Main Authors: Pinot, Adrien, Barraquand, Frederic, Tedesco, Edoardo, Lecoustre, Vincent, Bretagnolle, Vincent, V., Gauffre, Bertrand
Other Authors: Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS), Unité de recherche sur l'Ecosystème Prairial (UREP), Institut National de la Recherche Agronomique (INRA)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2016
Subjects:
Survival
Recruitment
CMR
Density dependence
Microtus arvalis
Population cycles
[SDE]Environmental Sciences
Common vole
Online Access:https://hal.science/hal-01497192
https://doi.org/10.1007/s10144-016-0552-3
Description
Summary:International audience Common voles in western France exhibit threeyearpopulation cycles with winter crashes after largeoutbreaks. During the winter of 2011–2012, we monitoredsurvival, reproduction, recruitment and population growthrate of common voles at different densities (from low tooutbreak densities) in natura to better understand densitydependence of demographic parameters. Between Octoberand April, the number of animals decreased irrespective ofinitial density. However, the decline was more pronouncedwhen October density was higher (loss of &54 % ofindividuals at low density and 95 % at high density). Usingcapture-mark-recapture models with Pradel’s temporalsymmetry approach, we found a negative effect of densityon recruitment and reproduction. In contrast, density had aslightly positive effect on survival indicating that mortalitydid not drive the steeper declines in animal numbers at highdensity. We discuss these results in a population cycleframework, and suggest that crashes after outbreaks couldreflect negative effects of density dependence on reproductionrather than changes in mortality rates.

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