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Maternal Effects Contribute to the Superior Performance of Extra-Pair Offspring
It is shown that EPO are larger, heavier, and more likely to fledge than their WP half-siblings in a population of blue tits, Cyanistes caeruleus, and suggested that the evidence for genetic benefits from extra-pair copulation may be less compelling than currently accepted.
Primary sex ratio adjustment to experimentally reduced male UV attractiveness in blue tits
The last result confirms the pattern found in the previous blue tit study, which suggests that these complex patterns of primary sex ratio variation are repeatable in this bird species, warranting further research into the adaptive value of blue tit sex ratio adjustment to male UV coloration.
Endogenous testosterone is not associated with the trade-off between paternal and mating effort
Studying barn swallows shows that, within males, testosterone concentrations were not higher around the fertile period of the social mate than during nestling feeding, and male feeding effort was not related to testosterone concentration during feeding.
Phylogeography of five Polytrichum species within Europe
Findings suggest that R juniperinum has recolonized Europe after the latest glacial period from two different refugia, one possibly being the British Isles.
Sexual Dimorphism in Plumage and Size in Black-Tailed Godwits Limosa Limosa Limosa
Black-tailed Godwits are sexually dimorphic mostly with respect to the amount of white spots on the neck, females being of lighter colour than males, and a greater overlap in bill length between the sexes than expected.
Linking intronic polymorphism on the CHD1-Z gene with fitness correlates in Black-tailed Godwits Limosa l. limosa
It is speculated that strong asymmetrical overdominance may explain the low frequency of the Z* allele and that genetic linkage to causal genes might be an explanation for the phenotypic correlations, which suggest a degree of cryptic genetic population structuring in the Dutch Godwit population.
Dutch House Martins Delichon urbicum gain blood parasite infections over their lifetime, but do not seem to suffer
In a northern population of the colonial-breeding Afrotropical migrant House Martins Delichon urbicum, the limited evidence so far suggests that House Martin get infected away from the European breeding grounds.
Eggshell pigmentation in the blue tit: male quality matters
- E. P. Badas, J. Martínez, +4 authors S. Merino
- BiologyBehavioral Ecology and Sociobiology
- 2 March 2017
The results, although observational, suggest that male attractiveness, male age, extra-pair paternity and parasitic infections could be important determinants of eggshell pigmentation.
Amount and structure of intra- and interspecific genetic variation in the moss genus Polytrichum
Allozyme electrophoresis was used to determine amount and structure of genetic variation within and between five congeneric haploid moss species, suggesting that the morphological conservatism is not due to lack of genetic variability and evolutionary potential.
New primers for molecular sex identification of waders
A new primer set is developed, 2602F/2669R, and it is shown that these primers can be used to reliably sex Red Knots and eight other wader species in four genera.