Abstract
ABSTRACT Exposure of adult rainbow trout to low pH (pH 4·3) in soft water (Ca2+ = 223 μequiv/1) caused a substantial ionic disturbance which arose primarily because of large net losses at the gills. In contrast, renal ion losses were low initially and declined even further because of a pronounced reduction in urine flow. A net influx of H+ occurred across the gills but this was not sufficient to cause a blood acid-base disturbance or a renal response. Although branchial ion and H+ fluxes declined with time, blood ion levels did not return to normal and many of the fish died. Further reduction in water calcium (Ca2+ = 69 μequiv/1) provoked a higher mortality and a more substantial ionic imbalance. These results contrast sharply with the effects on trout of acid exposure in hard water (Ca2+ ⩾ 1600μequiv/l), where net ion losses and mortality are reduced and H+ uptake increased. A preliminary model for the interaction of low pH and calcium is proposed and evidence for adaptation to acid stress and for the origin of acid lethality is discussed.
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Dates
Type | When |
---|---|
Created | 4 years, 4 months ago (April 24, 2021, 9:41 p.m.) |
Deposited | 2 years, 7 months ago (Jan. 11, 2023, 7:56 a.m.) |
Indexed | 1 year, 5 months ago (March 26, 2024, 10:40 p.m.) |
Issued | 42 years, 8 months ago (Jan. 1, 1983) |
Published | 42 years, 8 months ago (Jan. 1, 1983) |
Published Print | 42 years, 8 months ago (Jan. 1, 1983) |
@article{McDonald_1983, title={The Interaction of Environmental Calcium and Low pH on the Physiology of the Rainbow Trout, Salmo Gairdneri}, volume={102}, ISSN={1477-9145}, url={http://dx.doi.org/10.1242/jeb.102.1.123}, DOI={10.1242/jeb.102.1.123}, number={1}, journal={Journal of Experimental Biology}, publisher={The Company of Biologists}, author={McDonald, D. G.}, year={1983}, month=jan, pages={123–140} }