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Keywords: Hypoxia
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Journal Articles
J Exp Biol (2022) 225 (13): jeb244064.
Published: 27 June 2022
... have shown that inhibiting SERT, which would inhibit 5-HT uptake and degradation, attenuates parts of the cardiovascular hypoxia reflex in gulf toadfish ( Opsanus beta ), suggesting that these 5-HT clearance processes may be important during hypoxia exposure. Therefore, the goal of this experiment...
Journal Articles
J Exp Biol (2022) 225 (12): jeb244080.
Published: 14 June 2022
...Sulayman A. Lyons; Grant B. McClelland ABSTRACT Highland native deer mice ( Peromyscus maniculatus ) have greater rates of lipid oxidation during maximal cold challenge in hypoxia (hypoxic cold-induced V̇ O 2 ,max ) compared with their lowland conspecifics. Lipid oxidation is also increased in deer...
Includes: Supplementary data
Journal Articles
J Exp Biol (2022) 225 (11): jeb244239.
Published: 6 June 2022
... ). The best-fitting model was curvilinear using five strategically selected P O 2 values. This model predicted P AAS-50 as 70 mmHg (coefficient of variation, CV=9%) for rainbow trout. Thus, while a five-point hypoxic performance curve can characterize the limiting effects of hypoxia in fish, as envisaged...
Includes: Supplementary data
Journal Articles
J Exp Biol (2022) 225 (10): jeb216440.
Published: 18 May 2022
..., high anaerobic capacity, high hypoxia tolerance and high thermal tolerance. * Author for correspondence ( dalval@inpa.gov.br ) Competing interests The authors declare no competing or financial interests. © 2022. Published by The Company of Biologists Ltd 2022 Summary: Amazonia...
Journal Articles
J Exp Biol (2022) 225 (9): jeb242503.
Published: 5 May 2022
... environments such as ponds, estuaries and intertidal zones use strategies, including phenotypic plasticity, to modify their physiology and behaviour, thus maintaining homeostasis in challenging physical conditions. Hypoxia Hyperoxia Killifish Sculpins Phenotypic plasticity Salinity Natural...
Journal Articles
J Exp Biol (2022) 225 (Suppl_1): jeb243421.
Published: 8 March 2022
... O 2 uptake capacity and possibly aerobic performance in situations of high O 2 demand (e.g. exercise) or low O 2 availability (e.g. environmental hypoxia). We also found that FW fishes had significantly higher haemoglobin (Hb)–O 2 binding affinities than SW species, which will increase the O 2...
Includes: Supplementary data
Journal Articles
J Exp Biol (2022) 225 (4): jeb196725.
Published: 21 February 2022
...Matthew E. Pamenter ABSTRACT Hypoxia is one of the strongest environmental drivers of cellular and physiological adaptation. Although most mammals are largely intolerant of hypoxia, some specialized species have evolved mitigative strategies to tolerate hypoxic niches. Among the most hypoxia...
Journal Articles
J Exp Biol (2021) 224 (8): jeb242210.
Published: 30 April 2021
... as a 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...
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...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (19): jeb226076.
Published: 9 October 2020
... Blastema Hypoxia Zebrafish Axolotl The regeneration of the gills of fish and amphibians involves three major phases: (1) wound healing; (2) formation of the blastema (see Glossary); and (3) re-development, which includes the proliferation of blastema cells, their differentiation and tissue...
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
..., by 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: 3 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 rate, O 2...
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