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Article
Open AccessHow to solve novel problems: the role of associative learning in problem-solving performance in wild great tits Parus major
Although problem-solving tasks are frequently used to assess innovative ability, the extent to which problem-solving performance reflects variation in cognitive skills has been rarely formally investigated. Us...
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Article
Open AccessInter-individual variation in provisioning rate, prey size and number, and links to total prey biomass delivered to nestlings in the Collared Flycatcher (Ficedula albicollis)
In bird species where offspring growth and survival rely on parents’ food provisioning, parents can maximise their fitness by increasing the quantity and/or the quality of preys delivered to their offspring. M...
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Article
Open AccessEvidence of phenotypic correlation between exploration activity and resting metabolic rate among populations across an elevation gradient in a small rodent species
Behavior and metabolism are frontline reactions to environmental challenges that can covary in their response through at least two mechanisms. First, natural selection can generate correlation in phenotype amo...
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Article
Open AccessAvian erythrocytes have functional mitochondria, opening novel perspectives for birds as animal models in the study of ageing
In contrast to mammalian erythrocytes, which have lost their nucleus and mitochondria during maturation, the erythrocytes of almost all other vertebrate species are nucleated throughout their lifespan. Little ...
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Article
Open AccessConstraint and cost of oxidative stress on reproduction: correlative evidence in laboratory mice and review of the literature
One central concept in evolutionary ecology is that current and residual reproductive values are negatively linked by the so-called cost of reproduction. Previous studies examining the nature of this cost sugg...
