Abstract
We used a transplant experiment to examine the effects of short-term pH depressions in spring on whole-body concentrations of nine metal cations (Ca, Mg, Na, Zn, Pb, Al, Mn, Cd, and Fe) and survival of two species of aquatic insects collected from two habitats with year-round differences in pH. Survival of Leptophlebia cupida and Prosimulium fuscum/mixtum was close to 100% in 4- and 10-d in situ toxicity tests prior to and during snowmelt at pH levels ranging from 6.5 to 4.2. Differences in metal concentrations (Zn, Cd, and Na) existed between mayflies collected from different streams with pH values of 6.2−5.6. Both species transplanted from pH 6.2 to 4.2 streamwater had significant decreases in whole-body concentrations of Ca, Al, and Mn. Additionally, mayflies had significant losses of Mg, Fe, and Pb, while blackflies decreased in whole-body Na and Zn concentration. Percentages of the whole-body Al concentration in the adsorbed, absorbed, and gut content fractions were 3.3, 31.7, and 65%, respectively, for L. cupida and 1.6, 56.4, and 42%, respectively, for P. fuscum/mixtum. The percent adsorbed doubled in transplanted (versus control) mayflies, but the overall whole-body Al concentration decreased.
Published Version
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