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Keywords: hypoxia
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Journal Articles
J Exp Biol (2021) 224 (8): jeb242210.
Published: 30 April 2021
... measure of hypoxia tolerance. Here, P crit is defined as the P O 2 at which physiological oxygen supply (α 0 ) reaches its maximum capacity (α; µmol O 2 g −1 h −1 kPa −1 ). α is a species- and temperature-specific constant describing the oxygen dependency of the maximum metabolic rate (MMR= P O 2 ×α) or...
Includes: Supplementary data
Journal Articles
J Exp Biol (2021) 224 (8): jeb239970.
Published: 23 April 2021
... coronary O 2 delivery affects tolerance to environmental extremes such as warming and hypoxia. Hypoxia reduces arterial oxygenation, while warming increases overall tissue O 2 demand. Thus, as both stressors are associated with reduced venous O 2 supply to the heart, we hypothesised that coronary flow...
Includes: Supplementary data
Journal Articles
J Exp Biol (2021) 224 (8): jeb240804.
Published: 16 April 2021
..., hypercapnia and hypoxia. A selective OX 1 R antagonist (SB-334867; 5–25 µmol l −1 ) or agonist (ORX-A; 200 nmol l −1 to 1 µmol l −1 ) was added to the superfusion media. Experiments were performed under basal conditions (media equilibrated with 98.2% O 2 and 1.8% CO 2 ), hypercapnia (5% CO 2 ) or hypoxia (5–7...
Journal Articles
J Exp Biol (2020) 223 (20): jeb232694.
Published: 29 October 2020
... [HCO 3 − ]. Aerial hypoxia (15.3 kPa) and aerial hyperoxia (>40.9 kPa) had no effects on UFR, but both inhibited branchial Na + influx, revealing novel aspects of the osmorespiratory compromise. Aquatic hypoxia (4.1 kPa), but not aquatic hyperoxia (>40.9 kPa), inhibited gill Na + influx, UFR and...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (19): jeb226076.
Published: 09 October 2020
.... Regeneration Lung Gill Blastema Hypoxia Zebrafish Axolotl Funding Research funding was provided to M.G.J. by the Natural Sciences and Engineering Research Council of Canada (05571). References Abdallah , S. J. , Jonz , M. G. and Perry , S. F. ( 2014 ). Extracellular H...
Journal Articles
J Exp Biol (2020) 223 (17): jeb227736.
Published: 11 September 2020
... dives to great depths, while typically avoiding (or tolerating) hypoxia, hypercarbia, acidosis and decompression sickness (DCS). Over the last few decades, research has revealed that diving physiology is underdeveloped at birth. Here, I review the postnatal development of the body's oxygen stores...
Journal Articles
J Exp Biol (2020) 223 (16): jeb225623.
Published: 26 August 2020
...Rachel L. Malison; Amanda G. DelVecchia; H. Arthur Woods; Brian K. Hand; Gordon Luikart; Jack A. Stanford ABSTRACT Aquatic insects cope with hypoxia and anoxia using a variety of behavioral and physiological responses. Most stoneflies (Plecoptera) occur in highly oxygenated surface waters, but some...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (14): jeb228098.
Published: 28 July 2020
... salinity, elevated temperature and lowered oxygen concentration. Acclimation to low salinity resulted in a small, but significant, elevation of P crit (suggesting lower tolerance of hypoxia); acclimation to elevated temperature increased SMR, MMR, AAS and P crit ; acclimation to low oxygen led to a small...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (11): jeb208306.
Published: 29 May 2020
... focused on measuring short-term performance responses in animals under acute exposure to critical thermal maximums. The OCLTT hypothesis, however, emphasises the importance of sustained animal performance over acute tolerance. The present study tested the effect of chronic hypoxia and hyperoxia during...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (10): jeb204594.
Published: 18 May 2020
... microRNAs that can rapidly and reversibly target all biological functions. Herein, we review the involvement of microRNAs in natural models of anoxia and hypoxia tolerance, with a focus on the involvement of oxygen-responsive microRNAs (OxymiRs) in coordinating the metabolic rate depression that allows...
Journal Articles
J Exp Biol (2020) 223 (7): jeb213942.
Published: 03 April 2020
...Milica Mandic; Yihang K. Pan; Kathleen M. Gilmour; Steve F. Perry ABSTRACT Fish increase ventilation during hypoxia, a reflex termed the hypoxic ventilatory response (HVR). The HVR is an effective mechanism to increase O 2 uptake, but at a high metabolic cost. Therefore, when hypoxia becomes severe...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (5): jeb211250.
Published: 11 March 2020
... the cardiovascular responses to progressive hypoxia in four high-altitude Andean duck species compared with four related low-altitude populations in North America, tested at their native altitude. Ducks were exposed to stepwise decreases in inspired partial pressure of O 2 while we monitored heart...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (2): jeb218743.
Published: 21 January 2020
... proportion of time at the hypoxic end of the P O 2 gradient compared with the normoxic end. To determine whether hypoxia accentuates metabolic depression in C. alboguttata , we exposed frogs to normoxia (21.0 kPa) or hypoxia (10.5 kPa) for 7 weeks during the transition from an active to an aestivating state...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (22): jeb203646.
Published: 13 November 2019
...Gordon R. Ultsch; Matthew D. Regan ABSTRACT The critical O 2 tension ( P crit ) is the lowest P O 2 at which an animal can maintain some benchmark rate of O 2 uptake ( Ṁ O 2 ). This P O 2 has long served as a comparator of hypoxia tolerance in fishes and aquatic invertebrates, but its usefulness in...
Journal Articles
J Exp Biol (2019) 222 (21): jeb205419.
Published: 08 November 2019
...Brandt Smith; Janna L. Crossley; Ruth M. Elsey; James W. Hicks; Dane A. Crossley, II ABSTRACT The effects of the embryonic environment on juvenile phenotypes are widely recognized. We investigated the effect of embryonic hypoxia on the cardiovascular phenotype of 4-year-old American alligators...
Journal Articles
J Exp Biol (2019) 222 (18): jeb210633.
Published: 26 September 2019
... were evaluated, resulting in specific recommendations for future research. Critical oxygen tension Oxygen consumption Aerobic metabolism Fundulus grandis Killifish Hypoxia There is considerable interest in describing the oxygen dependence of aerobic metabolism of animals...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (17): jeb208918.
Published: 05 September 2019
... offspring, acting as a bridge for survival when persistent stressors occur. Transgenerational inheritance Crude oil Epigenetics Hypoxia Larva Heart rate Environmental stressor Transgenerational epigenetic inheritance enables parent-to-offspring transfer of modified phenotypes without...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (14): jeb206839.
Published: 19 July 2019
... represents an important physiological constraint that may limit colonization of such habitats, even if the thermal niche is appropriate. To test the mechanisms underlying the response to ecologically relevant levels of hypoxia, we performed a translocation experiment with the common wall lizard ( Podarcis...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (11): jeb201202.
Published: 04 June 2019
... goldfish Carassius auratus . This study aimed to evaluate the cardiac expression of SELENOT, and the effects of exogenous PSELT (a 43–52 SELENOT-derived peptide) on the heart function of C. auratus , a hypoxia tolerance fish model. We found that SELENOT was expressed in cardiac extracts of juvenile and...
Journal Articles
J Exp Biol (2019) 222 (10): jeb200899.
Published: 13 May 2019
... Phototransduction Physiology Electroretinogram Hypoxia Phototransduction is the process by which the energy from photons of light is translated into neural signals by photoreceptor cells ( Rayer et al., 1990 ). The neural signaling requires the constant depolarization and repolarization of photoreceptors...
Includes: Supplementary data