Using Aquatic Macroinvertebrates as Indicators of Stream Flow ...
Using Aquatic Macroinvertebrates as Indicators of Stream Flow ...
Using Aquatic Macroinvertebrates as Indicators of Stream Flow ...
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• Perlidae (golden or common stonefly): perennial indicator; lighter brown, slightly flattenedbody with golden patterning; up to 30 mm (1.2 in.); gillclusters around the b<strong>as</strong>e <strong>of</strong> each leg; two cerci (“tails”)at tip <strong>of</strong> abdomen• Capniidae (snowfly or slender winter stonefly): intermittent indicator; elongate dark bodywith cylindrical abdomen, slightly bulbous in the mid-region; up to 20 mm (0.8 in.) in length;no gills in “neck” region; two cerci (“tails”) at tip <strong>of</strong> abdomen• Nemouridae (forestfly): intermittent indicator; small, stout, hairy bodies; up to 9 mm (0.35in.) in length; may have gills in “neck” region; both pairs <strong>of</strong>wing pads diverge at an angle from midline <strong>of</strong> body; twocerci (“tails”) at tip <strong>of</strong> abdomenColeoptera (beetles)• Elmidae (riffle beetle): perennial indicator; larval body is elongated, cylindrical, hard, darkbrown or reddish; up to 16 mm (0.6 in.) long; may begill tuft at tip <strong>of</strong> abdomen. Adults have oval toelongate dark brown bodies; up to 6 mm (0.2 in.)long; head is <strong>of</strong>ten withdrawn under the pronotum(top <strong>of</strong> 1 st thoracic segment).• Psephenidae (water penny): perennial indicator; body is flattened, ovalto circular, up to 10 mm (0.4 in.) long; head and legs not visible in topview, covered by armored segments,<strong>Macroinvertebrates</strong> <strong>as</strong> indicators <strong>of</strong> stream flow duration,The Xerces Society for Invertebrate Conservation31
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