Variable Cone Crops, Migration, and Dynamics of a Population of Mountain Chickadees (Parus Gambeli)

  • D. Archibald McCallum
Part of the NATO ASI Series book series (volume 24)


Food is a required resource for individual survival and reproduction, and hence for population stability and persistence (Lack 1954). Wynne-Edwards (1962) suggested that social behaviour functions to regulate population densities within levels sustainable by resources, but his proposal that such behaviour evolves by group selection led to rejection of the entire idea. More recently, Gauthreaux (1978) has argued that dominance-mediated access to local resources can influence which individuals in a population are most likely to emigrate. Murray (1979), Pulliam (1987, 1988), and Łomnicki (1988) have integrated this notion into models showing that social behaviour characterized by individually-selected, rank-related resource access and emigration can enhance population stability. The amount of resource variation in the local environment and the success of the social system at mitigating its effects on population density naturally influence the type of social system that evolves.


Cone Index Florida Scrub Southern Rocky Mountain Cone Crop Regulate Population Density 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • D. Archibald McCallum
    • 1
  1. 1.Savannah River Ecology LaboratoryAikenUSA

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