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Avian Clock gene polymorphism: evidence for a latitudinal cline in allele frequencies
TLDR
Allelic variation in a region of the avian Clock orthologue which encodes a functionally significant polyglutamine repeat (ClkpolyQcds) is described within free‐living populations of two passerine birds, the migratory bluethroat and the predominantly nonmigratory blue tit.
Short- and long-term population dynamical consequences of asymmetric climate change in black grouse
TLDR
It is demonstrated that black grouse (Tetrao tetrix) have responded to spring warming by advancing both egg-laying and hatching, however, early summer has not advanced, and chicks have to face colder post-hatching conditions, demonstrating that chicks are increasingly suffering higher mortality because they hatch too early.
Prenatal androgen exposure modulates cellular and humoral immune function of black-headed gull chicks
TLDR
Embryonic exposure to elevated levels of androgens negatively affected both CMI and humoral immunity in nestling gull chicks, indicating that maternal yolk androgens not only entail benefits of enhanced competitiveness and growth, but also costs in terms of immunosuppression.
Color Signals in the Black Grouse (Tetrao tetrix): Signal Properties and Their Condition Dependency
TLDR
The data indicate that structural color is an important trait in sexual selection in this lekking species and that male sexual ornaments are more susceptible to environmental conditions than the other male traits, thus showing their heightened condition dependency compared with the other traits mediating the honesty of signaling.
Blood parasites mediate morph‐specific maintenance costs in a colour polymorphic wild bird
TLDR
It is concluded that blood parasite infection primarily has somatic costs, which differ between the two highly heritable tawny owl colour morphs with more pronounced costs in the grey (little pigmented) morph than in the brown (heavily pigmented), which highlights the need of experimental manipulation when studying heritable variation in hosts’ response to parasitism.
Ultraviolet vision and foraging in terrestrial vertebrates
TLDR
The possible role of UV cues and existing light conditions should be taken into account when food selection of vertebrate animals is studied, particularly, in experiments with artificial food items.
Maternal antibodies in a wild altricial bird: effects on offspring immunity, growth and survival.
TLDR
There is a trade-off, in magpies, between maternal resources, immune function and growth, shaping the evolution of maternal investment in offspring immunity.
The Mhc class II of the Black grouse (Tetrao tetrix) consists of low numbers of B and Y genes with variable diversity and expression
TLDR
It is found that the Black grouse possess low numbers of Mhc class II B (BLB) and Y (YLB) genes with variable diversity and expression, and it is hypothesize that the YLB genes could have been under purifying selection, just as the mammal MhC-E gene cluster.
Testing for between individual correlations of personality and physiological traits in a wild bird
TLDR
It is concluded that there is no common syndrome of individual level covariance between personality and physiological traits in wild blue tits or that the effect sizes are too low (r’< 0.3) to detect.
Trade–offs between sexual advertisement and immune function in the pied flycatcher (Ficedula hypoleuca)
TLDR
The results indicate that causality behind the trade–off between immune function and sexual advertisement may work in both directions: sexual activity suppresses immune function but immune challenge also reduces sexual advertisement.
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