Barn Swallows

Sex‐linked genetic diversity and differentiation in a globally distributed avian species complex

Sex chromosomes often bear distinct patterns of genetic variation due to unique patterns of inheritance and demography. The processes of mutation, recombination, genetic drift and selection also influence rates of evolution on sex chromosomes …

Signal Traits and Oxidative Stress: A Comparative Study across Populations with Divergent Signals

Diverging populations often shift patterns of signal use—a process that can contribute to reproductive isolation and speciation. Yet it is not clear why most traits gain or lose signal value during divergence. One reason this could occur is because …

Positive Carotenoid Balance Correlates with Greater Reproductive Performance in a Wild Bird

Carotenoids can confer somatic and reproductive benefits, but most evidence is from captive animal experimentation or single time-point sampling. Another perhaps more informative means by which to assess physiological contributions to animal …