Experimental evidence of the territorial defense, hypothesis in insular Blue Tits

  title={Experimental evidence of the territorial defense, hypothesis in insular Blue Tits},
  author={Philippe Perret and Jacques Blondel},
Many insular vertebrates have unusually high population densities and are characterized by behavioural shifts including reduced territory size and reduced situation-specific aggressiveness. Compared to their mainland counterparts, Blue Tits on the island of Corsica exhibit many traits that fit the trends observed in crowded insular populations. We demonstrate from behavioural observations in aviaries and from hormone measurements that Corsican its are less aggressive than mainland ones. These… 
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  • T. Schoener
  • Environmental Science
    The American Naturalist
  • 1983
How optimal territory size changes with changes in food density and intruder pressure is in theory complex and the qualitative effect of environmental changes will be indeterminate without detailed specification of the functions describing territorial costs and benefits.
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