w4 env lab - Laboratory 4 Assessing Water Quality 1 What...

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Laboratory 4: Assessing Water Quality 1. What are the names of the species used in this experiment? Which of these species was the most tolerant of increased acidity in the aquarium? Which species was the least tolerant? - The random species I chose were a snail, crayfish, and dragonfly nymph. The dragonfly nymph was the most tolerant of the increased acidity. At 7.0 and 6.7, both the snail and crayfish were tolerant; with the crayfish being the lesser. 2. Describe how acid precipitation affects ecosystems. - Acid rain has a pH range of 4.0-5.0. In industrialized regions, acid rain can be extremely acidic. If the acid rain in these areas registers a pH reading below 4.0, the acid rain can be as strong as vinegar, and sometimes lemon juice. Acid rain affects all parts of an ecosystem because it either raises or lowers the pH. Freshwater fish normally survive in water with a pH of 5-6, which is similar to that of unpolluted rainwater. Acid rain falling into a lake lowers the pH of the water, making it more acidic, and the fish cannot survive. Plants are also affected by acid rain; their
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