...Coen Hird; Craig E. Franklin; Rebecca L. Cramp ABSTRACT Many aquatically respiring animals acutely exposed to low pH waters suffer inhibition of ion uptake and loss of branchial (gill) epithelial integrity, culminating in a fatal loss of body Na + . Environmental calcium levels ([Ca 2+ ] e...

... consumption ( Ṁ O 2 ) and/or cutaneous oxygen flux ( J O 2 ), measured at the ionocyte-expressing yolk sac epithelium using the scanning micro-optrode technique (SMOT). Larvae at 4 days post-fertilization (dpf) that were reared under low pH (pH 4) conditions exhibited a higher rate of Na + uptake compared...

... on/in cells at low pH. We conclude that Cu accumulation by intestinal cells is mainly Na + -insensitive and more characteristic of a pH- and K + -sensitive Ctr1-like pathway than Cu uptake through ENaCs. * Author for correspondence (e-mail: [email protected] ) 9 11 2004 © The Company...

...M. W. Beaumont; P. J. Butler; E. W. Taylor SUMMARY The present study was undertaken to answer two questions relating to the exposure of brown trout Salmo trutta to sublethal concentrations of copper and low pH (CLP) for 96h. (1) What is the effect of these pollutants on the rate of oxygen...

... to ion-poor blackwater appears similar to that of some Rio Negro teleosts (Cichlidae) in which low-affinity transport systems are relatively sensitive to inhibition by low pH but are complemented by low diffusive loss rates. Ionic transport systems in these freshwater elasmobranchs, although...

... ) exposed to a sub-lethal combination of copper and low pH. However, this prediction is based upon two assumptions (i) a relatively high membrane permeability for the ammonium ion with respect to that for ammonia gas and (ii) that this is unaltered by exposure to copper and low pH. Since...

... of blood and muscle ammonia, reduced muscle glycogen stores and reduced muscle ion concentrations. 15 05 1996 ©The Company of Biologists Limited 1996 low pH swimming white muscle brown trout Salmo trutta . It has been shown that exposure to low (sublethal) environmental pH...

... the capacity of muscle to exercise. Alternatively, ammonia may have affected the nervous coordination of exercise either centrally or by disrupting peripheral motor innervation. 30 06 1995 © The Company of Biologists Limited 1995 copper low pH ammonia swimming brown trout Salmo trutta...

... 1993 by Company of Biologists 1993 intracellular pH swimming fatigue brown trout low pH Salmo trutta There is increasing evidence that acute exposure to low environmental pH has a detrimental effect on the swimming performance of salmonid fish. Although Waiwood and Beamish (1978...

...J. Freda; D. G. Mcdonald ABSTRACT This study investigated ion regulation in relation to water pH in three species of fish of differing tolerance to low pH (common shiners, Notropis cornutus , most sensitive; rainbow trout, Salmo gairdneri , intermediate; yellow perch, Perea flavescens , least...

... by Company of Biologists 1984 Fish calcium radiospaces unidirectional exchanges low pH Calcium ions play a vital role in several physiological phenomena including membrane stability, muscular contraction, hormonal release and cellular structure/composition (see papers in Duncan, 1976...

... to explain the complex interactions of calcium and pH are proposed. * Present address: Department of Biology, University of Calgary, Calgary, Alberta, T2N 1N4. 23 04 1982 09 08 1982 © 1983 by Company of Biologists 1983 Low pH calcium trout The importance...

...D. G. McDonald ABSTRACT Exposure of adult rainbow trout to low pH (pH 4·3) in soft water (Ca 2+ = 223 μ equiv/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...