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The influence of ph dissolved oxygen suspended solids or dissolved solids on ventilatory and cough frequencies in the bluegill lepomis macrochirus and brook trout salvelinus fontinalis



The influence of ph dissolved oxygen suspended solids or dissolved solids on ventilatory and cough frequencies in the bluegill lepomis macrochirus and brook trout salvelinus fontinalis



Environmental Pollution Series A Ecological & Biological 34(2): 149-170



Conservative no-effect concentration ranges were estimated for ventilatory and coughing responses of bluegill sunfish L. macrochirus and brook trout S. fontinalis exposed to altered pH, or to changes in dissolved O2 (DO), suspended solids or dissolved solids concentrations. These limits predicted safe, or non-alarm-causing, variations of these nontoxic environmental variables in applied biomonitoring systems using Lake Superior [USA, Canada] or similarly constituted waters as a dilution source. Bluegill ventilatory and coughing responses were slightly more sensitive than those of brook trout. Bluegills showed increased ventilatory frequency in dissolved O2 concentrations below 77% air saturation, .ltoreq. pH 6.7 and hardness of .gtoreq. 190 mg/l (as CaCO3), but no increase in ventilation in suspended solids concentrations up to 323 NTU (number of unit transfer) of clay particles. Brook trout responded with increased ventilation only in concentrations of DO at 44%, pH of 6.0 and 231 NTU suspended solids. Ventilatory frequency responses at low pH were attributed to increased free CO2 released by acidification of the dilution water. Over the DO range tested (44-117%) coughing was unaffected in both species. Bluegill coughing increased at pH levels > 9.0, but not at < pH 8.0. Increases also occurred in some suspended solids concentrations (.gtoreq. 90 NTU) and in hardness of .gtoreq. 190 mg/l. Brook trout coughing was unaffected over the pH range 5.1-10.1 and at all suspended solids (0.6-318 NTU) concentrations. The only coughing response observed for brook trout in different dissolved solids concentrations occurred at 1022 mg/l hardness.

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