A5082539243- Animal Behavior and Reproduction
- Plant and animal studies
- Avian ecology and behavior
- Insect and Arachnid Ecology and Behavior
- Evolutionary Psychology and Human Behavior
- Animal Vocal Communication and Behavior
- Physiological and biochemical adaptations
- Neuroendocrine regulation and behavior
- Telomeres, Telomerase, and Senescence
- Wildlife Ecology and Conservation
- Bat Biology and Ecology Studies
- Species Distribution and Climate Change
- Neurobiology and Insect Physiology Research
- Hypothalamic control of reproductive hormones
- Polar Research and Ecology
- Primate Behavior and Ecology
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Genetic diversity and population structure
- Circadian rhythm and melatonin
- Amphibian and Reptile Biology
- Insect Pheromone Research and Control
- Marine animal studies overview
- Molecular Biology Techniques and Applications
- Fish biology, ecology, and behavior
- Effects of Environmental Stressors on Livestock
Indiana University Bloomington
2016-2025
Indiana University
2011-2025
Duke University
2008-2011
In spite of recent interest in sexual selection females, debate exists over whether traits that influence female–female competition are sexually selected. This review uses aggressive behavior as a model behavioral trait for understanding the evolutionary mechanisms promoting intrasexual competition, focusing especially on selection. I employ broad definition selection, whereby mates selected, whereas those directly fecundity or offspring survival naturally Drawing examples from across animal...
Testosterone (T) regulates many traits related to fitness, including aggression. However, individual variation in aggressiveness does not always relate circulating T, suggesting that behavioural may be more closely neural sensitivity steroids, though this issue remains unresolved. To assess the relative importance of T and steroid predicting behaviour, we measured during staged intrusions free-living male female dark-eyed juncos ( Junco hyemalis ). We compared plasma levels abundance...
Research on male animals suggests that the hormone testosterone plays a central role in mediating trade-off between mating effort and parental effort. However, direct links testosterone, intrasexual aggression care are remarkably mixed across species. Previous attempts to reconcile these patterns suggest selection favors behavioral insensitivity when paternal is essential reproductive success breeding seasons especially short. Females also secrete though degree which similar...
Despite sharing much of their genomes, males and females are often highly dimorphic, reflecting at least in part the resolution sexual conflict response to sexually antagonistic selection. Sexual dimorphism arises owing sex differences gene expression, steroid hormones invoked as a proximate cause dimorphism. Experimental elevation androgens can modify behavior, physiology, but knowledge role remains incomplete, including how sexes differ expression hormones. We addressed these questions...
Significance Social challenges are thought to be embedded in the genome, but little is known about how this adaptive modification of gene activity occurs nature. We experimentally generated competition among free-living female tree swallows ( Tachycineta bicolor ) and measured both transcriptomic epigenomic changes brain. rapidly altered expression methylation, with effects that were enriched for hormone- neurotransmitter-related processes also being found two full days later. These...
Abstract On April 8th 2024, a total solar eclipse disrupted light-dark cycles for North American birds during the lead-up to spring reproduction. Compiling over 10,000 community observations and AI analyses of nearly 100,000 vocalizations, we found that bird behavior was significantly affected by these few minutes unexpected afternoon darkness. More than half wild species changed their biological rhythms, with many producing dawn chorus in aftermath eclipse. This natural experiment...
Abstract Hormones coordinate the expression of complex phenotypes and thus may play important roles in evolutionary processes. When populations diverge hormone‐mediated phenotypes, differences arise via changes circulating hormones, sensitivity to hormones or both. Determining relative importance signal requires consideration both inter‐ intrapopulation variation hormone levels, phenotype, but such studies are rare, particularly among closely related taxa. We compared males two subspecies...
Abstract Tree swallows ( Tachycineta bicolor ) are one of the most commonly studied wild birds in North America. They have advanced numerous research areas, including life history, physiology, and organismal responses to global change; however, transcriptomic resources scarce. To further advance utility this system for biologists across disciplines, we generated a transcriptome tree swallow using six tissues (brain, blood, ovary, spleen, liver, muscle) collected from breeding females. We de...
OPINION article Front. Ecol. Evol., 08 July 2014 | https://doi.org/10.3389/fevo.2014.00032
Summary Males and females can be highly dimorphic in metabolism physiology despite sharing nearly identical genomes, males both respond phenotypically to elevated testosterone, a steroid hormone that alters gene expression. Only recently has it become possible learn how like testosterone affects global expression non-model systems, whether the same genes females. To investigate transcriptional mechanisms by which exerts its metabolic physiological effects on periphery, we compared sex...
Abstract 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 facilitate range shifts via set bold, aggressive stress‐resilient traits. Many these same are associated with more northern latitudes, most hemisphere indicate northward movement. As consequence, it unclear whether pioneering simply corollaries existing latitudinal variation, or they override...
Growing evidence that female ornaments and armaments may be important for reproductive success suggests a reevaluation of the costs these potentially sexually selected traits is also necessary. Here, I examine whether intrasexual aggression, trait favored during direct female–female competition nesting sites in tree swallows (Tachycineta bicolor), costly terms quantity or quality offspring. compared measures aggressiveness to clutch size, cross-fostered offspring just after hatching explore...
Hormones are dynamic signaling molecules that influence gene activity and phenotype, they thus thought to play a central role in phenotypic evolution. In vertebrates, many fitness-related traits mediated by the hormone testosterone (T), but mechanisms which T levels evolve unclear. Here, we summarize series of studies advance our understanding these comparing males from two subspecies dark-eyed junco (Junco hyemalis) differ aggression, body size, ornamentation. We first review research...