Search Results - "Walker, Brian G"

Habituation of Adult Magellanic Penguins to Human Visitation as Expressed through Behavior and Corticosterone Secretion by WALKER, BRIAN G, DEE BOERSMA, P, WINGFIELD, JOHN C

“…Ecotourism is increasing worldwide; hence, it is important to know how wildlife are affected behaviorally and physiologically by human visitation. We studied…”
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Regional Genetic Structure in the Magellanic Penguin (Spheniscus magellanicus) Suggests Metapopulation Dynamics by Bouzat, Juan L, Walker, Brian G, Boersma, P. Dee

“…Using microsatellite markers and mitochondrial DNA (mtDNA) sequences (cytochrome oxidase 1 gene), we estimated levels of genetic structuring among nine…”
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Age and Food Deprivation Affects Expression of the Glucocorticosteroid Stress Response in Magellanic Penguin (Spheniscus magellanicus) Chicks by Walker, Brian G., Wingfield, John C., Boersma, P. Dee

“…We examined how the glucocortical stress response in free‐living Magellanic penguin (Spheniscus magellanicus) chicks changes with age and whether…”
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A phylogenetically controlled test of hypotheses for behavioral insensitivity to testosterone in birds by Lynn, Sharon E., Walker, Brian G., Wingfield, John C.

“…In most male birds that exhibit paternal care, extending the spring testosterone (T) peak throughout the breeding season reduces nestling provisioning…”
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Diurnal patterns of salivary cytokines differentially correlate with greater fluctuations in cortisol and diet composition: A pilot study by Andersen, Catherine J., Walker, Brian G., Karanian, Thomas J., Sloan, Allison, Campbell, Courtney, Dupree, Lydia, Woodruff, Rachael

“…Chronic stress and elevated cortisol are associated with adverse metabolic profiles and lifestyle patterns, systemic low-grade inflammation, and increased…”
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Maternal androgens in avian brood parasites and their hosts: responses to parasitism and competition? by Caldwell Hahn, D, Wingfield, John C, Fox, David M, Walker, Brian G, Thomley, Jill E

“…Highlights • In the arms race, two discoveries: both brood parasite & hosts use maternal effects. • Host bird eggs have elevated yolk T in parasitized nests. •…”
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Physiological and Behavioral Differences in Magellanic Penguin Chicks in Undisturbed and Tourist-Visited Locations of a Colony by WALKER, BRIAN G., BOERSMA, P. DEE, WINGFIELD, JOHN C.

“…Studies examining anthropogenic effects on wildlife typically focus on adults and on behavioral responses rather than the physiological consequences of human…”
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Breeding on the extreme edge: Modulation of the adrenocortical response to acute stress in two High Arctic passerines by Walker, Brian G., Meddle, Simone L., Romero, L. Michael, Landys, Meta M., Reneerkens, Jeroen, Wingfield, John C.

“…ABSTRACT Arctic weather in spring is unpredictable and can also be extreme, so Arctic‐breeding birds must be flexible in their breeding to deal with such…”
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Field Endocrinology and Conservation Biology by Walker, Brian G., Boersma, P. Dee, Wingfield, John C.

“…Field endocrinology techniques allow the collection of samples (i.e., blood, urine, feces, tissues) from free-living animals for analysis of hormones,…”
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Seasonal variation and correlation between corticosterone and the antioxidant uric acid during stress in the Northern Cardinal (Cardinalis cardinalis) by Haskins, Jonathan W., Spizzoucco, Frank A., Walker, Brian G.

“…Glucocorticoids modify metabolism and other physiological processes in order to mount an appropriate response to stress. This stress response is affected by a…”
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Fish on Prozac: a simple, noninvasive physiology laboratory investigating the mechanisms of aggressive behavior in Betta splendens by Lynn, Sharon E, Egar, Joseph M, Walker, Brian G, Sperry, Todd S, Ramenofsky, Marilyn

“…1 Department of Biology, The College of Wooster, Wooster, Ohio 2 Department of Biology, Fairfield University, Fairfield, Connecticut 3 Department of Biology,…”
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Mercury concentrations and awareness in Campos dos Goytacazes, Brazil: baseline measures for examining the efficacy of the Minamata Convention by Erhardt, Alexandra J., Rezende, Carlos E., Walker, Brian G., Franceschi, Dina, Downie, David

“…The 2013 Minamata Convention seeks to reduce anthropogenic emissions of mercury (Hg) and enhance public awareness of Hg exposure and impacts. The treaty also…”
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The effects of combined aromatase inhibitor and anti-androgen on male territorial aggression in a tropical population of rufous-collared sparrows, Zonotrichia capensis by Moore, Ignacio T., Walker, Brian G., Wingfield, John C.

“…Territorial aggression, exhibited by male vertebrates in a reproductive context, is generally thought to be mediated by elevated levels of the gonadal steroid…”
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British Ornithologists’ Union – Godman Salvin Prize

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PHYSIOLOGICAL CONDITION IN MAGELLANIC PENGUINS: DOES IT MATTER IF YOU HAVE TO WALK A LONG WAY TO YOUR NEST? by Walker, Brian G, Boersma, P. Dee, Wingfield, John C

“…Colony edges, as opposed to interiors, are often considered less advantageous nesting places in colonial species. For temperate-breeding penguins, inland…”
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A matter of history: effects of tourism on physiology, behaviour and breeding parameters in Magellanic Penguins (Spheniscus magellanicus) at two colonies in Argentina by Villanueva, Cecilia, Walker, Brian G., Bertellotti, Marcelo

“…Increasing ecotourism activity in Argentine Patagonia has led to concerns about the effects of ecotourism on wildlife populations. Penguin breeding colonies…”
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Physiological Condition in Magellanic Penguins: Does it Matter if You Have to Walk a Long Way to Your Nest? by Walker, Brian G., Boersma, P. Dee, Wingfield, John C.

“…Colony edges, as opposed to interiors, are often considered less advantageous nesting places in colonial species. For temperate-breeding penguins, inland…”
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Field Endocrinology and Conservation Biology1 by Walker, Brian G, Boersma, P. Dee, Wingfield, John C

“…Field endocrinology techniques allow the collection of samples (i.e., blood, urine, feces, tissues) from free-living animals for analysis of hormones,…”
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