Abstract
The stonefly fauna of an acidic intermittent unnamed tributary to Indian Creek, southwestern Pennsylvania, is described and compared with the fauna of a nearby circumneutral, perennial stream, Camp Run. The unnamed tributary had a distinctive stonefly fauna comprised of 22 species representing seven families, with the highest species richness and abundance in the families Capniidae, Leuctridae and Nemouridae. Allocapnia nivicola (FITCH) was the dominant species. Ostrocerca albidipennis (WALKER) and Leuctra ferruginea (WALKER) were the secondary dominants. Perlids and pteronarcyids were absent. Camp Run had 22 stonefly species representing all nine North American stonefly families, with the highest species richness or abundance in the Capniidae, Leuctridae, and Peltoperlidae. Thirteen species were found in both the unnamed tributary and Camp Run, including six species of Leuctra. Univoltine and semivoltine species were present in both streams. Published accounts of life history, behavior, and acid tolerance were reviewed to explain presence or absence of stonefly species in the unnamed tributary.
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