A5089768478- Animal Behavior and Reproduction
- Avian ecology and behavior
- Plant and animal studies
- Animal Vocal Communication and Behavior
- Bird parasitology and diseases
- Animal Nutrition and Physiology
- Physiological and biochemical adaptations
- Hypothalamic control of reproductive hormones
- Wildlife Ecology and Conservation
- Neuroendocrine regulation and behavior
- Marine animal studies overview
- Bat Biology and Ecology Studies
- Amphibian and Reptile Biology
- Stress Responses and Cortisol
- Animal Behavior and Welfare Studies
- Species Distribution and Climate Change
- Reproductive biology and impacts on aquatic species
- Primate Behavior and Ecology
- Reproductive Physiology in Livestock
- Climate variability and models
- Evolutionary Psychology and Human Behavior
- Insect and Arachnid Ecology and Behavior
- Circadian rhythm and melatonin
- Neurobiology and Insect Physiology Research
- Effects of Environmental Stressors on Livestock
University of California, Davis
2016-2025
University of California System
2011-2022
University of California, Irvine
1980-2022
North Dakota State University
2022
University of Washington
2007-2018
Deakin University
2017
Google (United States)
2017
U.S. National Science Foundation
2015
Directorate for Biological Sciences
2015
Howard Hughes Medical Institute
2009
A combination of field and laboratory investigations has revealed that the temporal patterns testosterone (T) levels in blood can vary markedly among populations individuals, even within individuals from one year to next. Although T is known regulate reproductive behavior (both sexual aggressive) thus could be expected correlate with mating systems, it clear absolute are not always indicative state. Rather, pattern amplitude change far more useful making predictions about hormonal basis...
SYNOPSIS. Superimposed upon seasonal changes in morphology, physiology and behavior, are facultative responses to unpredictable events known as labile (i.e., short-lived) perturbation factors (LPFs). These include behavioral physiological that enhance survival collectively make up the “emergency” life history stage. There is considerable evidence glucocorticosteroids, other hormones hypothalamo—pituitary—adrenal (HPA) cascade, initiate orchestrate emergency stage within minutes hours. This...
Abstract Many avian species of the North American Sonoran desert, e.g., black‐throated sparrow, Amphispiza bilineata , cactus wren, Campylorhynchus brunneicapillus and curve‐billed thrasher, Toxostoma curvirostre can potentially breed from March/April to August. It is possible that, at least in summer, intense heat aridity may have inhibitory effects on breeding by precipitating a stress response. Stress typically results rise secretion adrenocorticosteroid hormones that then inhibit...
Terry Burke, Mark Blaxter, David Lank and colleagues report a reference genome sequence of the ruff analysis three distinct male morphs this bird species. They identify 'supergene' consisting fixed inversion in two candidate reproductive trait genes region. Three strikingly different alternative mating (aggressive 'independents', semicooperative 'satellites' female-mimic 'faeders') coexist as balanced polymorphism ruff, Philomachus pugnax, lek-breeding wading bird1,2,3. Major differences...
Corticosterone (B) may play a direct role in the promotion of feeding behavior under conditions nutritional stress. However, effects exogenous B and stress passerines indicate complex relationship fed state, perceived or anticipated stress, previous history. In series investigations on caged White-crowned Zonotrichia leucophrys Song Sparrows Z. melodia, foraging behaviors rates were unaffected by birds. When food was returned, birds implanted with refed for longer greater intensity following...
1. The seasonal dynamics of body condition (BC), circulating corticosterone levels (baseline, BL) and the adrenocortical response to acute stress (SR) were examined in long‐lived Black‐legged Kittiwakes, Rissa tridactyla , breeding at Duck (food‐poor colony) Gull (food‐rich Islands lower Cook Inlet, Alaska. It was tested whether reflect a change bird physiological due reproduction and/or variation foraging conditions. 2. BC declined seasonally, decline more pronounced birds food‐poor colony....
Field and laboratory investigations were conducted to assess the effects of selected stressors on White-crowned Sparrows (Zonotrichia leucophrys gambelii Z. l. pugetensis). Within a few minutes after capture during non-breeding winter phase, birds' plasma corticosterone increased, whereas their already low levels luteinizing hormone (LH) dihydrotesterone (DHT) declined further. In contrast, in summer, or breeding increased much more slowly (sometimes not at all females) first hour capture....
-Breeding male House Sparrows (Passer domesticus) were implanted with testosterone (T), the antiandrogen flutamide (F), or an empty capsule as a control (C). Parental feeding rates by C-treated males high until nestlings reached 10 days of age, then declined significantly. This is typical temporal pattern parental behavior for free-living males. In contrast, F-treated fed young at rate throughout nestling stage, while T-treated much less frequently and more involved in male-male competition...
Urbanization dramatically changes the composition and diversity of biotic communities. The characteristics distinguishing species that persist in urban environments, however, are poorly understood. Here we test hypothesis broadly adapted organisms better able to tolerate urbanization, using a phylogenetically controlled, global comparison birds. We compared elevational latitudinal distributions 217 birds found 73 world's largest cities with 247 rural congeners possess broader environmental...
Plasma levels of immunoreactive luteinizing hormone (irLH) and 5 steroid hormones have been measured through the course winter breeding season vernal autumnal migration in both sexes White-crowned Sparrow, Zonotrichia leucophrys gambelii. Birds were captured mist nets or traps on wintering grounds Washington California area vicinity Fairbanks, Alaska. Blood samples collected from a wing vein as soon after capture possible. then individually marked with unique combination 1 2 colored leg...
The levels of immunoreactive luteinizing hormone (irLH), testosterone, dihydrotestosterone (DHT), estradiol, estrone, and corticosterone have been measured through the course breeding season in plasma both sexes from a population white-crowned sparrows, Zonotrichia leucophrys pugetensis, on Camano Island, Washington. Birds were captured nets or traps. After removal blood sample performance laparotomy to ascertain developmental stage reproductive system, birds marked with unique combinations...