Sex differences in nest defence by the red-backed shrike<Emphasis Type="Italic"> Lanius collurio</Emphasis>: effects of offspring age,brood size,and stage of breeding season |
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Authors: | Email author" target="_blank">Piotr?TryjanowskiEmail author Artur?Go?awski |
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Institution: | (1) Department of Avian Biology & Ecology, Adam Mickiewicz University, Fredry 10, 61-701 Poznań, Poland;(2) Department of Zoology, University of Podlasie, Prusa 12, 08-110 Siedlce, Poland |
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Abstract: | The red-backed shrike Lanius collurio is an open-cup nesting passerine bird, which protects its nest aggressively attacking predators near the nest. The response
of parents to a human observer was investigated during the nesting period 1999–2001 in Poland. The intensity of nest defence
increased as the breeding cycle progressed in accordance to the offspring value hypothesis. However, we did not find an increase
in the level of aggression according to the number of offspring and the time of season. Contrary to previous predictions,
we did not find gender differences in nest defence. More aggressive parents, both females and males, have significantly better
breeding success than quieter individuals. |
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Keywords: | Red-backed shrike Lanius collurio Nest defence Breeding success Predation |
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