Interaction of osmoregulatory and acid-base compensation in white sturgeon (Acipenser transmontanus) during exposure to aquatic hypercarbia and elevated salinity

The Journal of Experimental Biology
Ciaran A ShaughnessyJ S Bystriansky

Abstract

Migratory fishes encounter a variety of environmental conditions, including changes in salinity, temperature and dissolved gases, and it is important to understand how these fishes are able to acclimate to multiple environmental stressors. The gill is the primary site of both acid-base balance and ion regulation in fishes. Many ion transport mechanisms involved with acid-base compensation are also required for the regulation of plasma Na(+) and Cl(+), the predominant extracellular ions, potentially resulting in a strong interaction between ionoregulation and acid-base regulation. The present study examined the physiological interaction of elevated dissolved CO2 (an acid-base disturbance) on osmoregulation during seawater acclimation (an ionoregulatory disturbance) in juvenile white sturgeon (Acipenser transmontanus). Blood pH (pHe), plasma [HCO3 (-)], [Na(+)], [Cl(-)] and osmolality, white muscle water content, and gill Na(+)/K(+)-ATPase (NKA) and Na(+)/K(+)/2Cl(-) co-transporter (NKCC) abundance were examined over a 10 day seawater (SW) acclimation period under normocarbia (NCSW) or during prior and continued exposure to hypercarbia (HCSW), and compared with a normocarbic freshwater (NCFW) control. Hypercarbia induced a severe...Continue Reading

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Citations

Oct 17, 2019·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Ciaran A Shaughnessy, Stephen D McCormick
Mar 12, 2017·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Ryan B ShartauColin J Brauner
Nov 14, 2020·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Ciaran A Shaughnessy, Jason P Breves

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