Mortality of Brook Trout, Mottled Sculpins, and Slimy Sculpins during Acidic Episodes

摘要: Abstract Brook trout Salvelinus fontinalis, mottled sculpins Cottus bairdi, and slimy cognatus occur in many Pennsylvania streams that have depressed pH elevated aluminum concentrations during episodes of high stream discharge (acidic episodes). We performed 20-d situ cage exposures with these species to determine their relative sensitivities field conditions. also exposed fish the laboratory synthetic soft water, without added Al, elevate possible effects Al on sodium flux rates toxicity. Exposures were five streams: Two (>5.60) low (<80 μg/L) three (usually between 5.0 5.5) levels (124–294 μg/L). two low-discharge fall periods, when tends be seasonally higher lower, relatively high-discharge spring seasons, lower are typical. Few died (generally < 10%) had pH...