Trichoptera: Hydropsychidae of Gunnison County, ColoradoHydropsyche cockerelli - Spotted sedge Banks, 1905Updated 4 Mar 2011
Good LinksOn this website:Hydropsyche Introduction Other Websites: Illustration - University of Alberta Entomology Collection Species page Has illustration of male genitalia, description, habitat information, range and more. ReferencesAlstad,DN 1980 Comparative biology of the common Utah Hydropsychidae (Trichoptera). American Midland Naturalist 103, 167-174.Banks,N 1905 Descriptions of new neuropteroid insects. Transactions of American Entomological Society 32, 1-20. 
Canton,SP; Ward,JV 1981 The aquatic insects, with emphasis on Trichoptera, of a Colorado stream affected by coal strip-mine drainage. Southwestern Naturalist 25 4, 453-460. They studied Trout Creek where it runs through the Edna Coal Mine in northwestern Colorado. The mine spoils were 30 meters from the edge of the creek (approximately a 100 foot buffer zone). They found the aquatic insect density (numbers per square meter) and biomass (weight in grams per square meter) did not change above and below the mine. The Shannon-Weaver Diversity index also showed no difference between sites. However the community structure (which species were present and proportions) did change. Since there were irrigation water and cattle influences at their downstream site, their results may reflect these additional water uses. They note the biggest visible change at this mine is the loss of willow and alder trees downstream of the mine. The caddisfly population changed the most between sites, shifting from a mix of families above the mine to dominance by Hydropsychidae and Glossosomatidae below the mine. Quote from page 457: "The Hydropsychidae (Arctopsyche inermis, Hydropsyche cockerelli, and H. oslari) were unimportant at C2 (reference site), comprising only 3% of trichopteran numbers, while at C4 (mine affected), with increased abundance of Hydropsyche spp., they accounted for 16% of the density." Hauer,FR; Stanford,JA 1982 Ecology and life histories of three net-spinning caddisfly species (Hydropsychidae: Hydropsyche) in the Flathead River, Montana. Freshwater Invertebrate Biology 1:18-29. They present life history data on the three species H. cockerelli, H. oslari and H. occidentalis in the tailwaters of Hungry Horse Dam. Quotes from the abstract "H. cockerelli and H. oslari were significantly (P < 0.05) more abundant than H. occidentalis at all sampling sites. H. cockerelli larvae grew primarily during late summer and early autumn while temperatures were > 7 degrees C. Larvae overwintered in 5th instar and emerged as adults in mid-June." Hauer,FR; Stanford,JA and Ward,JV 1989 Serial discontinuities in a Rocky mountain river. II. Distribution and abundance of trichoptera. Regulated Rivers: Research and Management 3(1) 177–182. Abstract: "River regulation in the headwaters and middle reaches of the Gunnison River, Colorado, significantly altered distributions and abundances of Trichoptera fauna. Twenty-five species were collected from mainstream samples, with the greatest species richness occurring at an unregulated, rhithron segment above the central reach dams. At sites immediately below the three hypolimnial-release dams and a reregulation dam, species richness was reduced 35–90 per cent and abundance > 95 per cent. Net-spinning caddisflies were the dominant trichopterans at unregulated sites; Arctopsyche grandis in the upper reaches (218 organisms, 586 mg dry mass m-2) and Hydropsyche cockerelli, H. occidentalis and Cheumatopsyche pettiti in the lower river (9041 total organisms, 6621 mg m-2), downstream from the last dam. The observed distributional pattern of low trichopteran densities in dam tailwaters and high hydropsychid densities at sites 60–80 km below the central reach dams is a classic expression of continuum resets and adjustments in response to stream regulation as predicted by the Serial Discontinuity Concept. " Herrmann,SJ; Ruiter,DE; Unzicker,JD 1986 Distribution and records of Colorado Trichoptera. Southwestern Naturalist 31 4, 421-457. They note the habitat for this species is streams and rivers, the altitudinal range is 1311 to 3109m and adult collection dates are 16 May to 7 September. Quote from page 428: "In Colorado this species is common and widespread in the foothills and montane zones both east and west of the continental divide." They list this species as present in Gunnison county. Nimmo, A. P. 1987. The adult Arctopsyche and Hydropsyche (Trichoptera) of Canada and adjacent United States. Questiones Entomologicae 23:1-189. del Rosario,RB; Betts,EA; Resh, VH. 2002 Cow manure in headwater streams: tracing aquatic insect responses to organic enrichment. Journal of the North American Benthological Society 21: 278-289 Abstract Schefter,PW; Wiggins,GB (1986) A systematic study of the nearctic larvae of the Hydropsyche morosa group (Trichoptera: Hydropsychidae). Life Sciences Miscellaneous Publications of the Royal Ontario Museum. Voelz,NJ; Ward,JV 1996a Microdistributions, food resources and feeding habits of filter-feeding Trichoptera in the Upper Colorado River. Archiv für Hydrobiologie 137 3, 325-348. Zuellig,RE; Kondratieff,BC; Rhodes,HA 2002 Benthos recovery after an eposodic sediment release into a Colorado Rocky Mountain river. Western North American Naturalist 62 1, 59-72. Brown, Wendy S. 2005 Trichoptera (Caddisflies) of Gunnison County, Colorado, USA www.gunnisoninsects.org |