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Whither the challenge hypothesis?
Almost fifty years ago the advent of assay methods to measure circulating levels of
hormones revolutionized endocrinology in relation to investigations of free-living and captive …
hormones revolutionized endocrinology in relation to investigations of free-living and captive …
Hormonal, behavioral, and life-history traits exhibit correlated shifts in relation to population establishment in a novel environment
Climate change, habitat alteration, range expansions, and biological invasions are all
predicted to require rapid shifts in multiple traits including behavior and life history, both for …
predicted to require rapid shifts in multiple traits including behavior and life history, both for …
Decoupling pioneering traits from latitudinal patterns in a North American bird experiencing a southward range shift
Ecogeographic rules describe spatial patterns in biological trait variation and shed light on
the drivers of such variation. In animals, a consensus is emerging that 'pioneering'traits may …
the drivers of such variation. In animals, a consensus is emerging that 'pioneering'traits may …
Divergence along the gonadal steroidogenic pathway: implications for hormone-mediated phenotypic evolution
Across a range of taxa, hormones regulate suites of traits that influence survival and
reproductive success; however, the mechanisms by which hormone-mediated traits evolve …
reproductive success; however, the mechanisms by which hormone-mediated traits evolve …
On the existence and potential functions of low-amplitude vocalizations in North American birds
Research on acoustic communication has focused predominantly on high-amplitude, long-
range vocalizations that are easily recognized from a distance by the human ear. However …
range vocalizations that are easily recognized from a distance by the human ear. However …
The telomere regulatory gene POT1 responds to stress and predicts performance in nature: Implications for telomeres and life history evolution
Telomeres are emerging as correlates of fitness‐related traits and may be important
mediators of ecologically relevant variation in life history strategies. Growing evidence …
mediators of ecologically relevant variation in life history strategies. Growing evidence …
[PDF][PDF] Low-amplitude songs produced by male dark-eyed juncos (Junco hyemalis) differ when sung during intra-and inter-sexual interactions
The function and relative importance of low-amplitude (quiet) acoustic signals remains a
poorly understood aspect of animal communication. Research in songbirds has …
poorly understood aspect of animal communication. Research in songbirds has …
Gonads and the evolution of hormonal phenotypes
Hormones are dynamic signaling molecules that influence gene activity and phenotype, and
they are thus thought to play a central role in phenotypic evolution. In vertebrates, many …
they are thus thought to play a central role in phenotypic evolution. In vertebrates, many …
Baseline and stress-induced levels of corticosterone in male and female Afrotropical and European temperate stonechats during breeding
Background Latitudinal variation in avian life histories falls along a slow-fast pace of life
continuum: tropical species produce small clutches, but have a high survival probability …
continuum: tropical species produce small clutches, but have a high survival probability …
Hypothalamic–pituitary–adrenal axis activity is not elevated in a songbird (Junco hyemalis) preparing for migration
During spring, increasing daylengths stimulate gonadal development in migratory birds.
However, late-stage reproductive development is typically postponed until migration has …
However, late-stage reproductive development is typically postponed until migration has …