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Coevolutionary arms races: increased host immune defense promotes specialization by avian fleas

Archive ouverte | Møller, Anders, Pape | CCSD

We investigated the relationship between host defense and specialization by parasites in comparative analyses of bird fleas and T-cell mediated immune response of their avian hosts, showing that fleas with few main host species ex...

Covariation between brain size and immunity in birds: implications for brain size evolution

Archive ouverte | Møller, Anders, Pape | CCSD

Parasitism can negatively affect learning and cognition, setting the scene for coevolution between brain and immunity. Greater susceptibility to parasitism by males may impair their cognitive ability, and relatively greater male i...

Sperm competition and sexually size dimorphic brains in birds

Archive ouverte | Garamszegi, László Zsolt | CCSD

Natural selection may favour sexually similar brain size owing to similar selection pressures in males and females, while sexual selection may lead to sexually dimorphic brains. For example, sperm competition involves clear-cut se...

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