3.9 Article

Relative roles of density and rainfall on the short-term regulation of Mediterranean wood mouse Apodemus sylvaticus populations

Journal

ACTA THERIOLOGICA
Volume 55, Issue 3, Pages 251-260

Publisher

SPRINGER HEIDELBERG
DOI: 10.4098/j.at.0001-7051.046.2009

Keywords

Apodemus sylvaticus; density-dependence; Mediterranean forests; rainfall; population growth rate; wood mouse

Categories

Funding

  1. Diputacio de Barcelona
  2. Spanish Organismo Autonomo Parques Nacionales [003/2007]
  3. Spanish Ministerio de Ciencia e Innovacion [CSD2008-00040]
  4. UE [FP7-KBBE-2008-2B]
  5. Spanish thematic network GlobiMed

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This study aims to quantify the relative effects of density-dependent (feedback structure) and density-independent climatic factors (rainfall) in regulating the short-term population dynamics of wood mice Apodemus sylvaticus Linnaeus, 1758 in three Mediterranean forest plots. Rainfall and density explained additively 62% of variation in population growth rates (38 and 24%, respectively), with no differences among study plots. Population growth rate was positive during autumn-winter and negative during spring-summer during a 2.5-year period. Population rate of change was negatively affected by wood mouse density during the normal breeding season of Mediterranean mice (autumn-winter) but not outside it. Growth rate was positively affected by the cumulative amount of rainfall three months before the normal breeding season, but not during it. Female breeding activity and recruitment did not differ among plots, and was not affected by density or rainfall. However, recruitment was positively affected by density and, marginally, by rainfall. Our results suggest that intraspecific competition (density-dependence) and food availability (rainfall) are equally important factors driving wood mouse population dynamics in Mediterranean forests. Mechanisms underlying density-dependence during the breeding season seemed to be based on food-mediated survival rather than on behaviourally-mediated reproduction. Taken together, these results indicate a high sensitivity of marginal Mediterranean wood mouse populations to the expected climate changes in the Mediterranean region.

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