2020
DOI: 10.1242/jeb.208868
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Abstract: Acute (<96 h) exposure to elevated environmental CO 2 (hypercarbia) induces a pH disturbance in fishes that is often compensated by concurrent recovery of intracellular and extracellular pH (pH i and pH e , respectively; coupled pH regulation). However, coupled pH regulation may be limited at CO 2 partial pressure (P CO2) tensions far below levels that some fishes naturally encounter. Previously, four hypercarbiatolerant fishes had been shown to completely and rapidly regulate heart, brain, liver and white mus… Show more

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Cited by 10 publications
(6 citation statements)
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“…In addition to sturgeon, preferential pHi regulation has been observed in a number of other fishes including the armored catfish (Pterygoplichthys pardalis), the marbled swamp eel (Synbranchus marmoratus), the striped catfish (Pangasianodon hypophthalmus), and three species of gar (Lepisosteus oculatus, L. osseus, and Atractosteus spatula) (reviewed in Shartau et al, 2020). Preferential pHi regulation was also observed in the late stage developing embryos of the common snapping turtle (Chelydra serpentine; Shartau, Crossley, Kohl, & Brauner, 2016) and American alligator (Alligator mississippiensis; Shartau, Crossley, Kohl, Elsey, & Brauner, 2018).…”
Section: Coupled Ph Regulation and Preferential Phi Regulationmentioning
confidence: 99%
“…In addition to sturgeon, preferential pHi regulation has been observed in a number of other fishes including the armored catfish (Pterygoplichthys pardalis), the marbled swamp eel (Synbranchus marmoratus), the striped catfish (Pangasianodon hypophthalmus), and three species of gar (Lepisosteus oculatus, L. osseus, and Atractosteus spatula) (reviewed in Shartau et al, 2020). Preferential pHi regulation was also observed in the late stage developing embryos of the common snapping turtle (Chelydra serpentine; Shartau, Crossley, Kohl, & Brauner, 2016) and American alligator (Alligator mississippiensis; Shartau, Crossley, Kohl, Elsey, & Brauner, 2018).…”
Section: Coupled Ph Regulation and Preferential Phi Regulationmentioning
confidence: 99%
“…Corals might thus prioritize maintaining pH i at the expense of pH ECM during bleaching recovery, perhaps by altering protein expression or localization of different ion transporters [68], obscuring any individual-level differences in total pH regulatory capacity. This sort of ‘preferential pH regulation’ has been observed in air-breathing fishes that rapidly regulate pH i in response to CO 2 stress while allowing extracellular pH to remain acidic [69, 70]. Further research into the relationship between coral pH i and calcification should test the possibility that cnidarians also use preferential pH i regulation to balance the multiple acid-base challenges they face, including endosymbiont photosynthesis, cellular respiration, environmental acidification, and calcification [39].…”
Section: Resultsmentioning
confidence: 94%
“…This strategy of maintaining constant pHi in the face of lowered pHe (acidosis) is termed preferential pHi regulation (Brauner et al, 2019; Shartau et al, 2019). There is accruing evidence that preferential pHi regulation during hypercapnia (respiratory acidosis) may be a common strategy used by fishes, especially those that inhabit CO 2 ‐enriched environments (Shartau et al, 2020). While the mechanisms underlying preferential pHi regulation are unknown (Brauner et al, 2019), the obvious advantage over coupled pH regulation is that there is no limitation on the extent of pHi compensation, in particular under conditions of severe hypercapnia or when living in ion‐poor water, at which times it may not be possible to fully compensate pHe.…”
Section: Introduction To Acid‐base Regulationmentioning
confidence: 99%