Group 1: Ve Intolerant Stonefly Nymph Alderfly Nymph Dobsonfly Larva Snipe Fly Larva Mayfly Nymph Riffle Beetle Caddisfly Larva Water Penny Snails (right coiled) Group 2: Group 3: Moderatel Intolerant Fairl Tolerant Pollution Tolerance Index Calculator; Stream Quality Index Calculator; Intolerant: Moderately Tolerant: Fairly Tolerant: Stonefly Nymph Mayfly Nymph Caddisfly Larvae Dobsonfly Larvae Riffle Beetle Water Penny Right-handed Snail: Damselfly Nymph Dragonfly Nymphs Sowbug Scud Crane Fly Larvae Clams Mussels: ... Small Minnow Mayfly 4 Baetiscidae Armored Mayfly 3 Caenidae Small Square-gill Mayfly 7 Ephemerellidae Dragonflies range from very sensitive to very tolerant of stresses such as low dissolved oxygen that are caused by pollution. Scud With Eggs is now extinct in the Netherlands and the rest of Western Europe – a consequence of the Mayfly’s general low tolerance for pollution. It is an unfortunate fact that the genus of Mayflies studied by Swammerdam Palingenia sp. Group 1 - pollution sensitive (require higher DO, neutral pH, cold water) Ex. In Jordan, species of Baetidae family show more tolerance to pollution than Caenidae family. mayflies, stoneflies, caddisflies Group 2 – somewhat pollution tolerant Ex. Aquatic mayfly fauna are absent in eutrophic and thermal water bodies. ... mollusks, and worms. Flathead nymphs have these filaments long and covered with very short setae. Presence of flathead nymphs is often an indicator of good water quality, because they are relatively intolerant to pollution. One mayfly family, the small minnow mayfly, has been found in Arlington and it’s considered moderately pollution-sensitive. A tolerance score is included for each insect in this publication. Chemical, bacterial, and land use monitoring exist as well to provide more information on the health of a stream. The tolerance score, ranging from 0–10, represents the insect’s sensitivity to pollution and can be used to estimate the quality of the water in which the insect was found. Photo courtesy of BLM/USU National Aquatic Monitoring Center. General Tolerance Ranges for Orders of Macroinvertebrates Ephemeroptera (Mayflies) 0- 7 Plecoptera (Stoneflies) 0- 4 Trichoptera (Caddisflies) 0 -8 Odonota (Dragonflies) 1 -3 (Damselflies) 5 -9 Megaloptera (Dobsonflies) 0 -4 Diptera (True Flies) 2-10 Coleoptera (Beetles) 2- 5 Crustacea (Crayfish, Scuds, Sowbougs) 4-7 Mollusca (Snails, Clams) 6-8 menu. The body of mayfly nymphs terminates in three distinct caudal filaments. A Pollution Tolerance Index is a common way for stream ecologists to assess the health of a waterway through biological methods. Dragonflies that are sensitive to pollution are those that wait burrowed in the sediment to ambush their prey, where oxygen is first depleted when nutrient pollution occurs. Pollution Tolerant . 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