A5090797660- Animal Behavior and Reproduction
- Plant and animal studies
- Avian ecology and behavior
- Wildlife Ecology and Conservation
- Animal Vocal Communication and Behavior
- Bird parasitology and diseases
- Neuroendocrine regulation and behavior
- Evolutionary Psychology and Human Behavior
- Insect and Arachnid Ecology and Behavior
- Amphibian and Reptile Biology
- Marine animal studies overview
- Primate Behavior and Ecology
- Animal Behavior and Welfare Studies
- Circadian rhythm and melatonin
- Ecology and biodiversity studies
- Physiological and biochemical adaptations
- Species Distribution and Climate Change
- Insect and Pesticide Research
- Genetic and phenotypic traits in livestock
- Bat Biology and Ecology Studies
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Animal and Plant Science Education
- Neurobiology and Insect Physiology Research
- Impact of Light on Environment and Health
- Animal Nutrition and Physiology
Max Planck Institute for Ornithology
2016-2025
Max Planck Institute for Biological Intelligence
2023-2025
Ludwig-Maximilians-Universität München
2024-2025
Max Planck Institute of Neurobiology
2024
Max Planck Society
2010-2021
Bridge University
2021
University of Exeter
2021
Alphabet (United States)
2021
Google (United States)
2017
University of Washington
2004
Summary Many aspects of the social environment affect hypothalamic‐pituitary‐adrenal ( HPA ) axis function and increase circulating glucocorticoid concentrations. In this review, we examine relationships between in vertebrates. First, explore effects on secretion territorial (primarily non‐social) species, with an emphasis variation population density, as modified by environmental factors such predation risk food availability. general, high density or frequent intrusions are associated...
Summary 1. Methods to measure metabolites of steroid hormones from faeces have become very popular in wildlife conservation and ecology, because they allow gathering physiological data without the necessity capture animals. However, this advantage comes at costs that are particularly relevant when studying free‐living animals their natural environments. Previous methodological reviews stressed importance validations prove real hormone question measured, but research community has largely...
Space-based tracking technology using low-cost miniature tags is now delivering data on fine-scale animal movement at near-global scale. Linked with remotely sensed environmental data, this offers a biological lens habitat integrity and connectivity for conservation human health; global network of sentinels change.
Androgens are pleiotropic and play pivotal roles in the formation variation of sexual phenotypes. We show that differences circulating androgens between three male mating morphs ruff sandpipers linked to 17-beta hydroxysteroid dehydrogenase 2 (HSD17B2), encoded by a gene within supergene determines morphs. Low-testosterone males had higher HSD17B2 expression blood than high-testosterone males, as well brain areas related social behaviors testosterone production. Derived isozymes, which...
Migration remains one of the great mysteries animal life. Small migratory birds rely on refuelling stopovers after crossing ecological barriers such as deserts or seas. Previous studies have suggested that fuel reserves may determine stopover duration but this hypothesis could not be tested because methodological limitations. Here, we provide evidence subcutaneous fat stores by measuring permanence garden warblers ( Sylvia borin ) a small Mediterranean island during spring migration with...
Artificial light-at-night is known to affect a broad array of behaviours and physiological processes. In urbanized bird species, advances important biological rhythms such as daily cycles activity/rest timing reproduction, but our knowledge the underlying mechanisms limited. Given its role chronobiological signal, melatonin strong candidate for mediating effects light-at-night.We exposed urban rural European blackbirds (Turdus merula) two light treatments equal in photoperiod with different...
For male vertebrates, androgens are considered physiological mediators of the trade-off between mating and parenting effort. About 30 years ago, challenge hypothesis provided a conceptual framework to explain variation in androgen levels among individuals species, primarily as function competition parental care. Initially developed in—and applied to—birds, was rapidly adopted for other vertebrate groups even insects. Experimental evidence on birds, however, offers limited support terms...
Glucocorticoid (GC) hormones are important phenotypic mediators across vertebrates, but their circulating concentrations can vary markedly. Here we investigate macroevolutionary patterning in GC levels tetrapods by testing seven specific hypotheses about variation and evaluating whether the supported reveal consistent patterns evolution. If selection generally favors "supportive" role of GCs responding effectively to challenges, then baseline and/or stress-induced may be higher challenging...
Previous investigations suggest that male tropical birds have lower plasma testosterone concentrations than northern latitude species. To test whether this generalization is valid, we analyzed all currently available data of birds. We focused on peak breeding levels using phylogenetic and conventional statistics. Explanatory variables considered were social mating system, type territoriality, season length, altitude. On average, had mean temperate However, in several species, well within the...
Little is known about to what extent the sensitivity of hypothalamic-pituitary-adrenal (HPA) axis may be state dependent and vary in same species between environments. Here we tested whether faecal corticosteroid concentrations matrilineal adult female spotted hyenas are influenced by social reproductive status adjacent ecosystems they periods with without stress. Females Serengeti National Park frequently become socially subordinate intruders other hyena territories undertaking...
During migration, a number of bird species rely on stopover sites for resting and feeding before after crossing ecological barriers such as deserts or seas. The duration depends the combined effects environmental factors, endogenous programmes physiological conditions. Previous studies indicated that lean birds prolong their refuelling compared with fat birds; however, quantitative relationship between conditions behaviour has not been studied yet. Here, we tested in large sample free-living...
Testosterone is a key hormone for the development of secondary sexual characters and dimorphisms in behavior morphology male vertebrates. Because females often express detectable levels testosterone, testosterone has been suggested to also play role modulation traits females. Previous comparative analyses birds fish demonstrated relationship between male-to-female ratios degree dimorphism. Furthermore, female maximum was related mating system coloniality. Here, we reevaluate these previous...
Managing oxidative stress is an important physiological function for all aerobic organisms, particularly during periods of prolonged high metabolic activity, such as long-distance migration across ecological barriers. However, no previous study has investigated the status birds at different stages and whether that depends on condition birds. In this study, we compared (1) energy stores circulating measures in (a) two species Neotropical migrants with differing strategies were sampled autumn...
Competition elevates plasma testosterone in a wide variety of vertebrates, including humans. The ‘challenge hypothesis’ proposes that seasonal peaks during breeding are caused by social challenges from other males. However, experimentally induced male–male conflicts, increases only minority songbird species tested so far. Why is this so? Comparative evidence suggests with short season may not elevate levels territory defence. These even be limited their physiological capability to increase...
Rates of human-induced environmental change continue increasing with human population size, potentially altering animal physiology and negatively affecting wildlife. Researchers often use glucocorticoid concentrations (hormones that can be associated stressors) to gauge the impact anthropogenic factors (e.g. urbanization, noise light pollution). Yet, no general relationships between glucocorticoids have emerged. Given number recent studies reporting baseline stress-induced corticosterone...
Vocal signals such as calls play a crucial role for survival and successful reproduction, especially in group-living animals. However, call interactions dynamics within groups remain largely unexplored because their relation to relevant contexts or life-history stages could not be studied with individual-level resolution. Using on-bird microphone transmitters, we recorded the vocalisations of individual zebra finches (Taeniopygia guttata) behaving freely social groups, while females males...