Functional properties of hemoglobin during the adaptation of fish to low environmental pH

 

The dependence of the resistance of fish to acidification on the functional properties of hemoglobin has been studied in 21 species (nine families) of freshwater, marine, and anadromous fish. A direct correlation between the fish tolerance to low pH and the value of the Bohr effect has been revealed for the first time. On the basis of these data, the Bohr effect is proposed as a characteristic of the buffer properties of hemoglobin and acid resistance in fish. The curves of the oxygen equilibrium of hemoglobin are invariant in the fish having the lowest resistance to acidification (sturgeons). The maximum distortion of the invariance in the acidic buffer solution was observed in the most acid-resistant fish: pike and perch. The efficiency of the hemoglobin buffer system declined with decreasing resistance of fish to acidification.

Zaprudnova R.A., Kamshilov I. M. & Chalov Y. P., 2015. Functional properties of hemoglobin during the adaptation of fish to low environmental pH. Inland Water Biology 8(2):188-194. Article (subscription required).


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