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Keywords: Oxygen
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Journal Articles
J Exp Biol (2022) 225 (19): jeb243820.
Published: 13 October 2022
... of Hb–O 2 affinity, changing the overall oxygenation enthalpy (Δ H ′) values of opah (10–20°C) and swordfish (10–25°C) Hbs at pH 7.4 from −15 and −42 kJ mol −1 O 2 , respectively, to +84 and −9 kJ mol −1 O 2 . Swordfish blood–O 2 affinity was high compared with that of other large, pelagic, marine...
Includes: Supplementary data
Journal Articles
J Exp Biol (2021) 224 (18): jeb242522.
Published: 14 September 2021
... ever before. Aquatic respirometry measures the rate of oxygen uptake as a proxy for metabolic rate, and the intermittent-flow technique has numerous strengths for use with aquatic animals, allowing metabolic rate to be repeatedly estimated on individual animals over several hours or days and during...
Includes: Supplementary data
Journal Articles
J Exp Biol (2021) 224 (15): jeb242615.
Published: 2 August 2021
... oxygenation, we passed spectacled caiman hemolysate through a gel-filtration column to remove carbonic anhydrase. Spectacled caiman expresses a single adult Hb isoform ( Jelkmann and Bauer, 1980 ), similar to all other crocodilians examined ( Fago et al., 2020 ; Hoffmann et al., 2018 ). Results from gel...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (21): jeb222133.
Published: 12 November 2020
... , and aimed to determine whether individual oxygen demand influenced the behaviour of entire groups. Groups of seven fish were observed in an arena to measure air-breathing frequency of individuals and consequent group air-breathing behaviour, under three oxygen concentrations (100%, 60% and 20% air...
Journal Articles
J Exp Biol (2019) 222 (22): jeb206896.
Published: 21 November 2019
...Gigi Y. Lau; Sabine Arndt; Michael P. Murphy; Jeffrey G. Richards ABSTRACT Animals that inhabit environments that fluctuate in oxygen must not only contend with disruptions to aerobic metabolism, but also the potential effects of reactive oxygen species (ROS). The goal of this study was to compare...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (11): jeb200410.
Published: 10 June 2019
... of reactive oxygen species (ROS) after prolonged anoxia, but the mechanisms are unclear. Here, we investigated whether this mitochondrial suppression originates from downregulation of mitochondrial content or intrinsic activity by comparing heart mitochondria from (1) warm (25°C) normoxic, (2) cold-acclimated...
Journal Articles
J Exp Biol (2019) 222 (6): jeb191353.
Published: 18 March 2019
...Jules B. L. Devaux; Anthony J. R. Hickey; Gillian M. C. Renshaw ABSTRACT Exposure to anoxia leads to rapid ATP depletion, alters metabolic pathways and exacerbates succinate accumulation. Upon re-oxygenation, the preferential oxidation of accumulated succinate most often impairs mitochondrial...
Journal Articles
J Exp Biol (2018) 221 (19): jeb185553.
Published: 5 October 2018
...Matthew A. Birk; Agnieszka K. Dymowska; Brad A. Seibel ABSTRACT Squid are thought to obtain a large portion of their oxygen via simple diffusion across the skin in addition to uptake at the gills. Although this hypothesis has support from indirect evidence and is widely accepted, no empirical...
Journal Articles
J Exp Biol (2018) 221 (8): jeb177568.
Published: 25 April 2018
... examined alternative paths of gas exchange in sea spiders: (1) oxygen diffuses across pores in the cuticle, a common mechanism in terrestrial eggshells, (2) oxygen diffuses directly across the cuticle, a common mechanism in small aquatic insects, or (3) oxygen diffuses across both pores and cuticle. We...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (12): 2236–2242.
Published: 15 June 2017
... of dissolved oxygen (20%, 100% and 150% saturation), dissolved carbon dioxide (9.5 and 19.1 µmol l −1 ) and water flow (1–1.6 versus 4–13 cm s −1 ) in a repeated measures design. Dark respiration was enhanced by increased flow and increased oxygen saturation in an interactive way, which relates to improved...
Journal Articles
J Exp Biol (2017) 220 (6): 995–1007.
Published: 15 March 2017
... a morphometric model of the canal system, we also show that filter feeding may be more energetically costly than previously thought. Measurements of volumetric flow rates and oxygen removal in five species of demosponge show that pumping rates are variable within and between species, with the more oxygen...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (19): 3126–3136.
Published: 1 October 2016
...H. Arthur Woods; Steven J. Lane ABSTRACT Many terrestrial insects live in environments that flood intermittently, and some life stages may spend days underwater without access to oxygen. We tested the hypothesis that terrestrial insects with underground pupae show respiratory adaptations...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (23): 3807–3815.
Published: 1 December 2015
... that DGCs are terminated as a result of inadequate oxygen supply to the tissues. Table 1. DGC maintenance, respiratory gases and water exchanges before and during dehydration, and following rehydration of gregarious and solitary locusts Fig. 1. Daily respirometry measurements show DGC...
Journal Articles
J Exp Biol (2015) 218 (18): 2840–2846.
Published: 1 September 2015
... Optode Oxygen Respiration Spiracle Tracheal system Insects rely primarily on their tracheal system to exchange respiratory gases with the atmosphere ( Wigglesworth, 1931 ). The system consists of air-filled tubes that open to the air through spiracles on the surface of the thorax and abdomen...
Journal Articles
J Exp Biol (2014) 217 (9): 1543–1554.
Published: 1 May 2014
...Lutz T. Wasserthal Respiration in insects is thought to be independent of the circulatory system because insects typically lack respiratory pigments and because oxygen transport occurs in the gaseous phase through a ramified tracheal system by diffusion and convection directly to the tissues...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (8): 1205–1214.
Published: 15 April 2014
...D. J. Randall; J. L. Rummer; J. M. Wilson; S. Wang; C. J. Brauner Teleost fishes constitute 95% of extant aquatic vertebrates, and we suggest that this is related in part to their unique mode of tissue oxygenation. We propose the following sequence of events in the evolution of their oxygen...
Journal Articles
J Exp Biol (2014) 217 (1): 46–56.
Published: 1 January 2014
...) the physiology of marine invertebrates. Hypoxia occurs in marine systems when substantial biological O 2 demand and restricted water movement co-occur. It is a natural feature of enclosed (e.g. rock pools, sediments), semi-enclosed (e.g. poorly mixed fjords) or seemingly open (e.g. the oxygen minimum zone...
Journal Articles
J Exp Biol (2013) 216 (23): 4334–4340.
Published: 1 December 2013
...Viviane Callier; Alexander W. Shingleton; Colin S. Brent; Shampa M. Ghosh; Jinkyu Kim; Jon F. Harrison SUMMARY Rearing oxygen level is known to affect final body size in a variety of insects, but the physiological mechanisms by which oxygen affects size are incompletely understood. In Manduca sexta...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (15): 2560–2566.
Published: 1 August 2012
... defence. To understand whether nitric oxide (NO), a major regulator of vasodilatation and oxygen consumption, may be involved in the adaptive response of Trachemys to anoxia, we measured NO metabolites (nitrite, S- nitroso, Fe-nitrosyl and N- nitroso compounds) in the plasma and red blood cells of venous...
Journal Articles
J Exp Biol (2012) 215 (12): 1995–2002.
Published: 15 June 2012
... comparative framework. * Author for correspondence ( moran@clemson.edu ) 11 11 2011 21 2 2012 © 2012. 2012 body size evolution Bergmann carbonate temperature–size rule temperature oxygen polar ocean Arctic Antarctic optimality models life history...