Osmo-respiratory compromise in the mosshead sculpin (Clinocottus globiceps): effects of temperature, hypoxia, and re-oxygenation on rates of diffusive water flux and oxygen uptake

In nature, mosshead sculpins ( Clinocottus globiceps ) are challenged by fluctuations in temperature and oxygen levels in their environment. However, it is unclear how mosshead sculpins modulate the permeability of their branchial epithelia to water and O 2 in response to temperature or hypoxia stre...

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Bibliographic Details
Published in:Fish physiology and biochemistry 2023-10, Vol.49 (5), p.853-866
Main Authors: Onukwufor, John O., Somo, Derek A., Richards, Jeffrey G., Wood, Chris M.
Format: Article
Language:English
Subjects:
air
Animal Anatomy
Animal Biochemistry
Animal Physiology
Biomedical and Life Sciences
Clinocottus globiceps
Cottidae
Epithelium
fish
Fluctuations
Freshwater & Marine Ecology
Histology
Hypoxia
Life Sciences
Marine fishes
Morphology
Oligocottus maculosus
Oxygen
Oxygen consumption
Oxygen tension
Oxygen uptake
Oxygenation
Permeability
Respiration
Saturation
temperature
Temperature effects
Tide pools
Uptake
Water
Zoology
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Summary:In nature, mosshead sculpins ( Clinocottus globiceps ) are challenged by fluctuations in temperature and oxygen levels in their environment. However, it is unclear how mosshead sculpins modulate the permeability of their branchial epithelia to water and O 2 in response to temperature or hypoxia stress. Acute decrease in temperature from 13 to 6 o C reduced diffusive water flux rate by 22% and ṀO 2 by 51%, whereas acute increase in temperature from 13 to 25 o C increased diffusive water flux rate by 217% and ṀO 2 by 140%, yielding overall Q 10 values of 2.08 and 2.47 respectively. Acute reductions in oxygen tension from >95% to 20% or 10% air saturation did not impact diffusive water flux rates, however, ṀO 2 was reduced significantly by 36% and 65% respectively. During 1-h or 3-h recovery periods diffusive water flux rates were depressed while ṀO 2 exhibited overshoots beyond the normoxic control level. Many responses differed from those seen in our parallel earlier study on the tidepool sculpin, a cottid with similar hypoxia tolerance but much smaller gill area that occupies a similar environment. Overall, our data suggest that during temperature stress, diffusive water flux rates and ṀO 2 follow the traditional osmo-respiratory compromise pattern, but during hypoxia and re-oxygenation stress, diffusive water flux rates are decoupled from ṀO 2 .
ISSN:0920-1742
1573-5168
DOI:10.1007/s10695-023-01226-0