865 KB23 KB200520192012Kondratieff, Boris C.Martinson, Robert J.Sandberg, John B.številka:12letnik:8str. 125-133COBISSID:1139189ISSN:1854-0392ISSN:1855-5810URN:URN:NBN:SI:doc-6SD3H2LPenMississipi College, Dept. of BiologyPrirodoslovni muzej SlovenijeIlliesiaColoradodriftentomologyfood habitsIsoperla quinquepunctatalife historyPerlodidaePiceance BasinPlecopteraLife history and food habits of Isoperla quinquepunctata (Banks) (Plecoptera: Perlodidae) from a spring source and Willow Creek in the Piceance Basin, Colorado|Life history aspects of the perlodine stonefly Isoperla quinquepunctata (Banks) are reported from the Piceance Basin, Colorado. We wished to discover if the conditions of a spring source would affect the life cycle and relative food habits of I. quinquepunctata as compared to nearby Willow Creek, a typical region small stream site. It is often unusual to find stoneflies directly in a spring source in the southern Rocky Mountains, which had dissolved oxygen concentrations well below 5.2 mg/l (58% saturation), but withflowing water. Isoperla quinquepunctata exhibited a univoltine slow life cycle with extended hatching at both sites. At the spring, while the largest I. quinquepunctata nymphs ingested a variety of food types, they did not switch to carnivory as has usually been reported for Isoperla. Diatoms comprised the majority of the gut contents of nymphs from both the spring and Willow Creek sites, with detritus a more important component at the Willow Creek siteTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaPrirodoslovni muzej Slovenije