Survival costs of reproduction in the blue tit ( Parus caeruleus ): a role for blood parasites?

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Survival costs of reproduction in the blue tit (Parus caeruleus): a role for blood parasites?

One of the central tenets in life-history theory is that there is a trade-off between current and future reproduction (i.e. a cost of reproduction). The mechanism for this cost of reproduction is, however, largely unknown. One hypothesis is that the high workload during reproduction compromises resistance to parasites and that the resulting increase in parasitaemia has negative effects on the p...

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Unusual mitochondrial DNA polymorphism in two local populations of blue tit Parus caeruleus.

Mitochondrial DNA (mtDNA) from 25 blue tits Parus caeruleus sampled from two populations of the Grenoble region (France) was assayed for polymorphism with 17 restriction endonucleases. Nine genotypes were found. Several mtDNA genotypes were also analysed by amplification via the polymerase chain reaction (PCR) and direct sequencing of 903 bp of the cytochrome b gene. The mtDNA polymorphism is g...

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Separating the effects of predation risk and interrupted foraging upon mass changes in the blue tit Parus caeruleus.

The optimal amount of reserves that a small bird should carry depends upon a number of factors, including the availability of food and environmental predation risk levels. Theory predicts that, if predation risk increases, then a bird should maintain a lower level of reserves. Previous experiments have given mixed results: some have shown reduced reserves and some, increased reserves. However, ...

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Genetic variation and causes of genotype-environment interaction in the body size of blue tit (Parus caeruleus).

In several studies of natural populations of birds, the heritability of body size estimated by parent-offspring regression has been lower when offspring have developed in poor feeding regimens than when they developed in good feeding regimens. This has led to the suggestion that adaptation under poor regimens may be constrained by lack of genetic variation. We examined the influence of environm...

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Stress protein levels and blood parasite infection in blue tits (Parus caeruleus): a medication field experiment

It has been suggested that blood parasites are a source of physiological stress for avian hosts in the wild. We report the first experimental evidence relating blood parasite infection to the physiological stress response in a wild avian population. We reduced through medication the intensity of infection by Haemoproteus majoris and the prevalence of infection by Leucocytozoon majoris in half o...

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ژورنال

عنوان ژورنال: Proceedings of the Royal Society of London. Series B: Biological Sciences

سال: 2004

ISSN: 0962-8452,1471-2954

DOI: 10.1098/rspb.2004.2883