The osmorespiratory compromise, the trade-off between the requirements for respiratory and ionoregulatory homeostasis at the gills, becomes more intense during environmental hypoxia. One aspect which has been previously overlooked is possible change in transepithelial potential (TEP) caused by hypoxia which will influence branchial ionic fluxes. Using the euryhaline killifish, we show that acute hypoxia reduces the TEP across the gills by approximately 10 mV in animals acclimated to both fresh water (FW) and sea water (SW), with a higher PO2 threshold in the former. TEP becomes negative in FW, and less positive in SW. The effects are immediate, stable for at least 3 h, and reverse immediately upon return to normoxia. Hypoxia also blocks the normal increase in TEP that occurs upon FW to SW transfer, but does not reduce the fall in TEP which occurs in the opposite transfer. These effects may be beneficial in FW but not in SW.
Electrical aspects of the osmorespiratory compromise: TEP responses to hypoxia in the euryhaline killifish (Fundulus heteroclitus) in fresh water and sea water
Currently Viewing Accepted Manuscript - Newer Version Available
Chris M. Wood, Martin Grosell; Electrical aspects of the osmorespiratory compromise: TEP responses to hypoxia in the euryhaline killifish (Fundulus heteroclitus) in fresh water and sea water. J Exp Biol 2015; jeb.122176. doi: https://doi.org/10.1242/jeb.122176
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