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Keywords: Birds
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Journal Articles
J Exp Biol (2022) 225 (17): jeb244502.
Published: 9 September 2022
...Chenxing Li; Chenyu Liu; Pingxia Hu; Xiyu Zheng; Ming Li; Jinsong Liu ABSTRACT For small birds to survive during seasonal acclimatization in temperate zones, regulation of body mass and thermogenesis is crucial. To determine the role of temperature and photoperiod in seasonal changes in body mass...
Journal Articles
J Exp Biol (2022) 225 (12): jeb242612.
Published: 28 June 2022
... (27°C) temperatures, we expected to observe an upregulation of pectoralis muscle and liver respiratory capacity that would be visible in mitochondrial adjustments in cold-acclimated birds. We also predicted that these adjustments would correlate with thermogenic capacity ( M sum ) and basal metabolic...
Includes: Supplementary data
Journal Articles
J Exp Biol (2022) 225 (5): jeb243787.
Published: 1 March 2022
... ). Functional and evolutionary morphology of woodpeckers . Ostrich 70 , 23 - 31 . 10.1080/00306525.1999.9639746 Bout , R. G. and Zweers , G. A. ( 2001 ). The role of cranial kinesis in birds . Comp. Biochem. Physiol. Part A 131 , 197 - 205 . 10.1016/S1095-6433(01)00470-6...
Includes: Supplementary data
Journal Articles
J Exp Biol (2022) 225 (4): jeb243115.
Published: 24 February 2022
...Lara do Amaral-Silva; Welex Cândido da Silva; Luciane Helena Gargaglioni; Kênia Cardoso Bícego ABSTRACT The febrile response to resist a pathogen is energetically expensive, while regulated hypothermia seems to preserve energy for vital functions. We hypothesized here that immune-challenged birds...
Includes: Supplementary data
Journal Articles
J Exp Biol (2021) 224 (20): jeb242203.
Published: 21 October 2021
... Gmelin 1789). Rock pigeons lay two eggs per clutch, with a 48 h interval between the two eggs. In addition, rock pigeons can lay multiple clutches in a single breeding season ( Johnston and Janiga, 1995 ). The birds were identified by unique ring code and combination, and were housed in a large outdoor...
Journal Articles
J Exp Biol (2021) 224 (19): jeb227363.
Published: 5 October 2021
... stress studies in the avian taxa show conflicting results, identifies benefits and costs of developmental stressors and recommends future studies in the field. Nutritional stress Heat stress Cold stress Development Birds National Science Foundation http://dx.doi.org/10.13039/100000001...
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: 2 November 2020
... 2020 9 9 2020 Changes in body temperature in response to stressors have been widely reported across vertebrate taxa (e.g. squamates: Cabanac and Gosselin, 1993 ; birds: Greenacre and Lusby, 2004 ; fish: Rey et al., 2015 ; old-world primates: Parr and Hopkins, 2000 ; rodents: Dymond...
Journal Articles
J Exp Biol (2020) 223 (3): jeb216424.
Published: 3 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: 3 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: 1 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: 1 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: 1 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: 1 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: 1 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: 1 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...