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Keywords: birds
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Journal Articles
J Exp Biol (2021) 224 (20): jeb242203.
Published: 21 October 2021
... iodine in captive rock pigeons reduces egg production in some females, thus inducing a trade-off between offspring quality and offspring quantity. Maternal effects Maternal hormones Maternal investment Trade-offs Birds Academy of Finland http://dx.doi.org/10.13039/501100002341...
Journal Articles
J Exp Biol (2021) 224 (19): jeb227363.
Published: 05 October 2021
... stress Development Birds National Science Foundation http://dx.doi.org/10.13039/100000001 IOS-1553657 IOS-2015802 Fellowship 2020264516 Alabama Agriculture Experiment Station Sigma Xi http://dx.doi.org/10.13039/100011084 G20191001100140538...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (21): jeb226688.
Published: 10 November 2020
... should be able to transmit the hormonal signals independent of their own hormonal status. However, the ability to regulate hormone transfer to the next generation is under debate. We studied the transfer of thyroid hormones (THs) to eggs in a bird model. We elevated thyroxine (T 4 , the prohormone...
Journal Articles
J Exp Biol (2020) 223 (21): jeb229047.
Published: 02 November 2020
... responsiveness in a temperate endotherm. Dominance Stress Thermoregulation Birds The vertebrate stress response is characterised by coordinated behavioural and physiological modifications that enhance an individual's ability to cope with perceived challenges, or ‘stressors’. Over the past...
Journal Articles
J Exp Biol (2020) 223 (3): jeb216424.
Published: 03 February 2020
...) on captive house sparrows in order to investigate the consequences of short-term dehydration on baseline and stress-induced corticosterone levels. As expected, water-deprived birds displayed higher plasma osmolality and haematocrit. Additionally, water-deprived birds had lower defecation rates, suggesting...
Journal Articles
J Exp Biol (2019) 222 (11): jeb205229.
Published: 10 June 2019
... thus generate the observed diversity of external phenotypes. Starlings are generally dark birds despite iridescence in feathers, but 10% of species have evolved plumage pigmentation comprising bright colors that are known to be produced only by carotenoids. However, using micro-Raman spectroscopy, we...
Journal Articles
J Exp Biol (2019) 222 (7): jeb193961.
Published: 03 April 2019
... using stable isotope labelled androgens shows that maternal androgens in bird egg yolk are not taken up by the embryo during early incubation but rather are metabolized. Maternal effects Early hormone conversion Prenatal Birds Egg incubation Embryonic hormone uptake Exposure...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (4): jeb193227.
Published: 18 February 2019
...Agata Bury; Jowita Niedojadlo; Edyta T. Sadowska; Ulf Bauchinger; Mariusz Cichoń ABSTRACT Physical aerobic activity is oxygen demanding, but – particularly for birds – there is still little understanding of how blood contributes to oxygen supply under various activity levels. In a two-factorial...
Journal Articles
J Exp Biol (2018) 221 (22): jeb191056.
Published: 14 November 2018
...Kang Nian Yap; Morag F. Dick; Christopher G. Guglielmo; Tony D. Williams ABSTRACT Despite widely held assumptions that hematocrit (Hct) is a key determinant of aerobic capacity and exercise performance, this relationship has not often been tested rigorously in birds and results to date are mixed...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (4): jeb172213.
Published: 14 February 2018
... and an upregulation of oxidative phosphorylation efficiency. The aim of this study was to decipher mechanisms underlying the increased mitochondrial coupling efficiency reported in fasted birds. Mitochondrial oxidative phosphorylation activity, efficiency and membrane potential were measured in mitochondria isolated...
Journal Articles
J Exp Biol (2017) 220 (17): 3022–3025.
Published: 01 September 2017
... preferences in the house finch, Carpodacus mexicanus . Anim. Behav.   84 , 1483 - 1489 . 10.1016/j.anbehav.2012.09.021 Balthazart , J. and Schoffeniels , E. ( 1979 ). Pheromones are involved in the control of sexual-behavior in birds . Naturwissenschaften   66 , 55 - 56 . 10.1007...
Journal Articles
J Exp Biol (2017) 220 (13): 2445–2451.
Published: 01 July 2017
... isolated from pectoralis muscle. Results from long-term (4–5 months) naturally fasted chicks were compared with those from short-term (10 day) fasted birds. The respiratory activities of muscle fibres and isolated mitochondria were reduced by 60% and 45%, respectively, on average in long-term fasted chicks...
Journal Articles
J Exp Biol (2015) 218 (19): 3032–3041.
Published: 01 October 2015
... water loss in birds. However, the mechanisms by which lipids are able to regulate CWL and how these mechanisms change with depth in the SC are poorly understood. We used attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) to measure lipid–lipid and lipid–water interactions...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (18): 2847–2855.
Published: 01 September 2015
...Haruka Wada; Buddhamas Kriengwatana; Natalie Allen; Kimberly L. Schmidt; Kiran K. Soma; Scott A. MacDougall-Shackleton ABSTRACT In birds, incubation temperature can vary by several degrees Celsius among nests of a given species. Parents may alter incubation temperature to cope with environmental...
Journal Articles
J Exp Biol (2015) 218 (15): 2427–2434.
Published: 01 August 2015
... fed ducklings were compared with those from ducklings that were fasted for 4 days. During the 4 days of nutritional treatment, birds remained in the cold, at 4°C. The 4 days of starvation preferentially affected the pectoralis muscles, inducing an up-regulation of mitochondrial efficiency, which...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (14): 2190–2200.
Published: 01 July 2015
...Yufeng Zhang; Kathleen Eyster; Jin-Song Liu; David L. Swanson ABSTRACT Maximal metabolic outputs for exercise and thermogenesis in birds presumably influence fitness through effects on flight and shivering performance. Because both summit ( M sum , maximum thermoregulatory metabolic rate...
Journal Articles
J Exp Biol (2015) 218 (9): 1347–1358.
Published: 01 May 2015
...Bret A. Moore; Diana Pita; Luke P. Tyrrell; Esteban Fernández-Juricic ABSTRACT Avian species vary in their visual system configuration, but previous studies have often compared single visual traits between two to three distantly related species. However, birds use different visual dimensions...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (3): 491–499.
Published: 01 February 2015
... 2015. Published by The Company of Biologists Ltd 2015 Birds Flight performance Growth conditions Oxidative stress Telomeres Conditions experienced during growth are of crucial importance as they can have a significant influence on the optimisation of life histories ( Ricklefs, 1979...
Journal Articles
J Exp Biol (2014) 217 (15): 2627–2628.
Published: 01 August 2014
...Graeme Ruxton Powered flight has evolved three times in the vertebrates: in the birds, the bats and the extinct pterosaurs. The largest bats ever known are at least an order of magnitude smaller than the largest members of the other two groups. Recently, it was argued that different scaling...
Journal Articles
J Exp Biol (2014) 217 (6): 866–875.
Published: 15 March 2014
...David Swanson; Yufeng Zhang; Jin-Song Liu; Christopher L. Merkord; Marisa O. King Seasonal phenotypic flexibility in small birds produces a winter phenotype with elevated maximum cold-induced metabolic rates (=summit metabolism, Ṁ sum ). Temperature and photoperiod are candidates for drivers...