Stoneflies Are mostly found in cool, well- oxygenated streams. They are sensitive to most of the same pollutants as may- flies except acidity. They may be less numerous than mayflies. The presence of even a few stoneflies in a stream sug- gests that good water quality has been maintained for several months Perlodidae Patterned Stonefly source: Nymphs of North American Stonefly Genera; by Kenneth W. Stewart & Bill P. Stark
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Perlodidae - Environmentenvironment.arlingtonva.us/wp-content/uploads/...source: Larvae of the North American Caddisfly Genera; by Glenn B. Wiggins Hydropsychidae Common Net-Spinner
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Stoneflies Are mostly found in cool, well-oxygenated streams. They are sensitive to most of the same pollutants as may-flies except acidity. They may be less numerous than mayflies. The presence of even a few stoneflies in a stream sug-gests that good water quality has been maintained for several months
Perlodidae Patterned Stonefly
source: Nymphs of North American Stonefly Genera; by Kenneth W. Stewart & Bill P. Stark
source: Larvae of the North American Caddisfly Genera; by Glenn B. Wiggins
Hydropsychidae Common Net-Spinner Caddis
Caddisflies May construct a portable case of sand, stones, sticks, or other debris or may spin nets that serve as a retreat and help them to collect and gather food. Many caddisfly larvae are sensitive to pollution, but this family (Hydropsychidae) can be abundant in nutrient-rich environments
Stoneflies Are mostly found in cool, well-oxygenated streams. They are sensitive to most of the same pollutants as may-flies except acidity. They may be less numerous than mayflies. The presence of even a few stoneflies in a stream sug-gests that good water quality has been maintained for several months
source: Nymphs of North American Stonefly Genera; by Kenneth W. Stewart & Bill P. Stark
Perlidae Golden Stonefly
Mayflies Are often the most numerous organisms found in clean streams. They are sensitive to most types of pollution, including low dissolved oxygen, chlorine, ammonia, metals, pesticides, and acidity. Most may-flies are found clinging to the undersides of rocks.