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The physiology of life history trade-offs in animals
▪ Abstract The functional causes of life history trade-offs have been a topic of interest to
evolutionary biologists for over six decades. Our review of life history trade-offs discusses …
evolutionary biologists for over six decades. Our review of life history trade-offs discusses …
Seasonal changes in plasma glucocorticoid concentrations in free-living vertebrates
The vertebrate stress response helps animals respond to environmental dangers such as
predators or storms. An important component of the stress response is glucocorticoid (GC) …
predators or storms. An important component of the stress response is glucocorticoid (GC) …
Adaptation, exaptation, and constraint: a hormonal perspective
We approach conceptual issues in evolutionary biology from an endocrinological
perspective, noting that single hormones typically act on several target tissues and thereby …
perspective, noting that single hormones typically act on several target tissues and thereby …
Costs and benefits of fat-free muscle mass in men: Relationship to mating success, dietary requirements, and native immunity
On average, men have 61% more muscle mass than women (d= 3), a sex difference which
is developmentally related to their much higher levels of testosterone. Potential benefits of …
is developmentally related to their much higher levels of testosterone. Potential benefits of …
Hormones and life histories: an integrative approach
This article, which focuses on hormones and the diverse effects they have on behavior and
physiology, raises evolutionary questions that hormonal studies appear especially well …
physiology, raises evolutionary questions that hormonal studies appear especially well …
Testosterone, endurance, and Darwinian fitness: natural and sexual selection on the physiological bases of alternative male behaviors in side-blotched lizards
The mechanistic bases of natural and sexual selection on physiological and behavioral traits
were examined in male morphs of three colors of the side-blotched lizard, Uta stansburiana …
were examined in male morphs of three colors of the side-blotched lizard, Uta stansburiana …
Testosterone and avian life histories: effects of experimentally elevated testosterone on behavior and correlates of fitness in the dark-eyed junco (Junco hyemalis)
Hormones influence many aspects of organismal behavior, physiology, and morphology,
and thus hormones may lie at the root of many life-history trade-offs. By manipulating …
and thus hormones may lie at the root of many life-history trade-offs. By manipulating …
Testosterone in females: mediator of adaptive traits, constraint on sexual dimorphism, or both?
When selection on males and females differs, the sexes may diverge in phenotype.
Hormones serve as a proximate regulator of sex differences by mediating sex-biased trait …
Hormones serve as a proximate regulator of sex differences by mediating sex-biased trait …
Hormone-mediated suites as adaptations and evolutionary constraints
Hormones mediate the expression of suites of correlated traits and hence may act both to
facilitate and constrain adaptive evolution. Selection on one trait within a hormone-mediated …
facilitate and constrain adaptive evolution. Selection on one trait within a hormone-mediated …
Testosterone and aggression: Berthold, birds and beyond
Berthold's classic study of domesticated roosters in 1849 demonstrated that testicular
secretions are necessary for the normal expression of aggressive behaviour. Although this …
secretions are necessary for the normal expression of aggressive behaviour. Although this …