Results 81 to 90 of about 3,636 (171)

Determination of Ophthalmic Parameters and Ocular Morphology in Ring‐Necked Parakeets (Psittacula krameri)

Veterinary Ophthalmology, Volume 29, Issue 1, January 2026.
ABSTRACT Purpose To determine normal ophthalmic test values and to describe the ocular morphology of ring‐necked parakeets (Psittacula krameri). Materials and Methods 33 captive birds were examined, although not all tests were conducted on each bird.
Fernanda Taques Wendt, Fabiano Montiani‐Ferreira, Cecília Capacchi Dall’agnol, Franz Riegler Mello, Thiago Francisco Costa Solak, Breno Castello‐Branco Beirão, Marcello Machado, Rogério Ribas Lange   +7 more
wiley   +1 more source

Disturbance by jet boating increases corticosterone concentrations in the black‐backed gull (Larus dominicanus)

New Zealand Journal of Zoology, Volume 52, Issue 5, Page 537-550, December 2025.
ABSTRACT Recreational activities such as jet boating have the potential to disturb native birds that rely on braided river habitats. To examine whether jet boating affects levels of glucocorticoid hormones, which can increase in animals under stress, we compared concentrations of corticosterone in the faeces of nesting black‐backed gulls (Larus ...
Sanaz Safavian, James V. Briskie, Elissa Cameron, Hazel Chapman   +3 more
wiley   +1 more source

Endocrine and skeletal muscle physiology optimizing avian migratory capabilities

Journal of Avian Biology, Volume 2025, Issue 6, November 2025.
The long‐distance migrations of thousands of bird species and their billions of individuals are feats of astounding physiological specialization and plasticity. Whereas numerous organ systems require modification to achieve successful fueling and navigation capabilities, given their overarching importance for movement and contribution to body mass ...
Barney A. Schlinger, Mathew J. Fuxjager, Marilyn Ramenofsky   +2 more
wiley   +1 more source

Feather steroid hormone concentrations in relation to age, sex, and molting time in a long‐distance migratory passerine

Ecology and Evolution, 2019
In birds, concentrations of testosterone (T) and corticosterone (Cort) are closely connected with many morphological, behavioral, and other physiological traits, including reproduction, metabolism, immunity, and fitness.
Marie Adámková, Zuzana Bílková, Oldřich Tomášek, Zdeněk Šimek, Tomáš Albrecht   +4 more
doaj   +1 more source

Investigating the physiological underpinnings of proactive and reactive behavioural types in grey seals (Halichoerus grypus): Trial deployment of a minimally invasive data logger for recording heart rate and heart rate variability in a wild free-ranging breeding pinniped species [PDF]

, 2017
Individuals differ non-randomly in their responses to stressors, exhibiting consistent individual differences (CIDs) in behavioural and physiological coping mechanisms commonly referred to as coping styles.
BRANNAN, NAOMI,BOBBIE,LOUISE
core  

Pallid bands in feathers and associated stable isotope signatures reveal effects of severe weather stressors on fledgling sparrows [PDF]

, 2015
Citation: Ross, J. D., Kelly, J. F., Bridge, E. S., Engel, M. H., Reinking, D. L., & Boyle, W. A. (2015). Pallid bands in feathers and associated stable isotope signatures reveal effects of severe weather stressors on fledgling sparrows.
Boyle, Alice, Bridge, E. S., Engel, M. H., Kelly, J. F., Reinking, D. L., Ross, J. D.   +5 more
core   +1 more source

Physiological stress mediates the honesty of social signals. [PDF]

PLoS ONE, 2009
Extravagant ornaments used as social signals evolved to advertise their bearers' quality. The Immunocompetence Handicap Hypothesis proposes that testosterone-dependent ornaments reliably signal health and parasite resistance; however, empirical studies ...
Gary R Bortolotti, Francois Mougeot, Jesus Martinez-Padilla, Lucy M I Webster, Stuart B Piertney   +4 more
doaj   +1 more source

No detectable deployment impacts of solar‐powered GPS devices for long‐term use on a small shorebird

Journal of Avian Biology, Volume 2025, Issue 6, November 2025.
Portable devices, or biologgers, attached to animals are designed to record data on unobservable aspects of animal behaviour, physiology and ecology. However, wearing such devices is expected to be costly, and researchers must ascertain how such devices influence the behaviour, reproduction and survival of tagged individuals.
Michael J. Roast, Grant C. McDonald, Tamás Székely, András Kosztolányi, Ivan Maggini   +4 more
wiley   +1 more source

Nutritional stress affects corticosterone deposition in feathers of Caspian tern chicks

Journal of Avian Biology, 2014
Stressful environmental conditions affect the adrenocortical function of developing animals, which can have consequences for their fitness. Discovery of the avian stress hormone corticosterone (CORT) in feathers has the potential to broaden the application of endocrine research in ecological and evolutionary studies of wild birds ...
Allison G. L. Patterson, Alexander S. Kitaysky, Donald E. Lyons, Daniel D. Roby   +3 more
openaire   +1 more source

Loggers affect the foraging behaviour and fitness of European shags

Journal of Avian Biology, Volume 2025, Issue 6, November 2025.
Biologgers enable real‐time collection of detailed behavioural and physiological data from wide‐ranging animals, including seabirds inhabiting remote regions. However, the number of studies using tracking devices has not been matched by research exploring the behavioural and fitness costs of deployment, and the effects on data reliability.
Graeme Shannon, Kate Layton‐Matthews, Svein‐Håkon Lorentsen, Jenny Mattisson, Signe Christensen‐Dalsgaard, Nina Dehnhard   +5 more
wiley   +1 more source