Certain macroinvertebrates, like leeches and aquatic worms, thrive in poor quality water. Damselflies are moderately tolerant of pollution. 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 An abundance of these organisms suggests environmental conditions in a body of water have deteriorated. is now extinct in the Netherlands and the rest of Western Europe – a consequence of the Mayfly’s general low tolerance for pollution. The body of mayfly nymphs terminates in three distinct caudal filaments. Pollution Tolerance Index Calculator. Presence of flathead nymphs is often an indicator of good water quality, because they are relatively intolerant to pollution. 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 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. It is an unfortunate fact that the genus of Mayflies studied by Swammerdam Palingenia sp. Mayfly – There are many families of mayflies, many of which are classified as pollution-sensitive. In Jordan, species of Baetidae family show more tolerance to pollution than Caenidae family. Photo courtesy of BLM/USU National Aquatic Monitoring Center. ... mollusks, and worms. Flathead nymphs have these filaments long and covered with very short setae. ... 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. 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: 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. Chemical, bacterial, and land use monitoring exist as well to provide more information on the health of a stream. A tolerance score is included for each insect in this publication. Pollution Tolerant . 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