Latent Effects of Pulse Exposure to Aluminum and Low pH on Size, Ionic Composition, and Feeding Efficiency of Lake Trout (Salvelinus namaycush) Alevins

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Abstract
No mortality of lake trout (Salvelinus namaycush) embryos occurred during 5 d of exposure to aluminum concentrations of 0, 100, and 200 μg∙L−1in low-pH (pH 5.0) water or during 21- and 32-d recovery periods, but alevins from the high-Al exposure were smaller in length, had less calcified skeletons, had reduced (18–22%) whole-body concentrations of Ca2+and K+, and were less effective predators on Daphnia magna. These latent effects of pulse exposure to acidic Al-rich water may help explain the disappearance of lake trout populations from lakes with relatively high ambient pH.