Escape migration decisions in Eurasian Woodcocks: insights from survival analyses using large-scale recovery data - Archive ouverte HAL Access content directly
Journal Articles Behavioral Ecology and Sociobiology Year : 2011

Escape migration decisions in Eurasian Woodcocks: insights from survival analyses using large-scale recovery data

Guillaume Péron
Yves Ferrand
  • Function : Author
François Gossmann
  • Function : Author
Claudine Bastat
  • Function : Author
Michel Guénézan
  • Function : Author

Abstract

During unpredictable adverse conditions, endotherms can engage in emergency behaviors (movement, torpor, hyperphagia) to maintain energy balance and reduce mortality hazards. Bird "escape migration" is one of the most visible of these behaviors. In this study, we focus on a Eurasian Woodcock Scolopax rusticola population. Seasonal migrations bring this population from its breeding grounds in Eastern and Northern Europe to its wintering grounds in France. A varying number of these birds are also regularly reported from Spain, supposedly during additional escape movements that occur in winter. Using models that account for the imperfect detection rate of individuals and a large (>44,000 individuals) dataset combining information from the wintering and breeding ranges, we show that severe winters significantly reduced survival probability, but that migration to Spain increased only during the most intense cold spell that occurred over the 20-year study period. This suggests that the decision to resume migration during the winter is submitted to a threshold mechanism, which we discuss in the light of current models of migratory behavior.
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hal-03499309 , version 1 (25-12-2021)

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Guillaume Péron, Yves Ferrand, François Gossmann, Claudine Bastat, Michel Guénézan, et al.. Escape migration decisions in Eurasian Woodcocks: insights from survival analyses using large-scale recovery data. Behavioral Ecology and Sociobiology, 2011, 65, pp.1949 - 1955. ⟨10.1007/s00265-011-1204-4⟩. ⟨hal-03499309⟩

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