Trichoptera: Hydropsychidae of Gunnison County, ColoradoHydropsyche occidentalisBanks 1900Updated 11 Sept 2009
TSN 115513 LinksOn this website:Introduction to Hydropsyche Other Websites: Illustration - University of Alberta Entomology Collection Species page Has illustration of male genitalia, description, habitat information, range and more. PAN Pesticides database: http://preview.pesticideinfo.org/List_AquireAll.jsp?Species=4398&Effect= ReferencesAlstad,DN 1980 Comparative biology of the common Utah Hydropsychidae (Trichoptera). American Midland Naturalist 103, 167-174.Banks, N. 1900. New genera and species of Nearctic neuropteroid insects. Transactions of the American Entomological Society 26:239-260.  Dosdall, LM 1991 Survival of selected aquatic insects exposed to methoxychlor treatment of the Saskatchewan River system. Water Quality Research Journal of Canada. 26(1) 27-40. 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...snip.. H. occidentalis larval appearance and growth occurred approximately six weeks behind H. cockerelli larvae. Thus, most growth occurred at temperatures < 7 degrees C. We concluded that the delayed growth may have contributed directly, in terms of temperature response, to the infrequency of H. occidentalis larvae." Harris,TL and TM Lawrence 1978 Environmental requirements and pollution tolerance of Trichoptera. Environmental Protection Agency Report 600/4-78-063. Environmental Monitoring and Support Laboratory, Cincinnati,OH. 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 1085 to 2941m and adult collection dates are 10 June to 1 September. Quote from page 429: "This species altituditnal range overlaps that of H. cockerelli, although H. occidentalis occurs in the lowest portions of the plains zone in eastern Colorado. The lowest altitude reported forH. occidentalis outside Colorado by Harris and Lawrence (1978) was 805m. " They list this species as present in Gunnison county. Jannot,JE; Kerans,BL 2003 Body size, sexual size dimorphism, and Rensch's rule in adult Hydropsychid caddisflies (Trichoptera: Hydropsychidae). Canadian Journal of Zoology 81, 1956-1964. The authors measured 21 and 20 museum specimens from a number of locations of Hydropsyche occidentalis preserved in ethanol finding that adult males were 6.01 ± 0.11 mm in length and females were 6.43 ± 0.10 mm in length. They measured length from the center of the head between the eyes to the posterior margin of the 8th segment. More details Koslucher,DG and Minshall,GW 1973 Food habits of some benthic invertebrates in a northern cool-desert stream (Deep Creek, Curlew Valley, Idaho-Utah). Transactions of the American Microscopical Society, 92(3) 441-452. Abstract McCullough, DA and Minshall, GW and Cushing, CE 1979 Bioenergetics of lotic filter-feeding insects Simulium spp. (Diptera) and Hydropsyche occidentalis (Trichoptera) and their function in controlling organic transport in streams. Ecology: 60, (3), pp. 585–596. Abstract Mecom, John O. 1972 Productivity and distribution of Trichoptera larvae in a Colorado mountain stream. Hydrobiologia 40(2): 151 - 176. ISSN: 0018-8158 (Paper) 1573-5117 (Online) DOI: 10.1007/BF00016789 Abstract Mecom, J. 1970 Unusual case-building behaviour of Hydropsyche occidentalis larvae (Trichoptera: Hydropsychidae). Entomological News 81:33-35. Nimmo, A. P. 1987. The adult Arctopsyche and Hydropsyche (Trichoptera) of Canada and adjacent United States. Questiones Entomologicae 23:1-189. Ruse,LP; Herrmann,SJ 2000 Plecoptera and Trichoptera species distribution related to environmental characteristics of the metal-polluted Arkansas River, Colorado. Western North American Naturalist 60 1, 57-65. Quote from page 62: "Although no stoneflies were collected downstream of Pueblo Reservoir, the hydropsychids Cheumatopsyche pettiti and Hydropsyche occidentalis and the hydroptilids Hydroptila ajax and Ochrotrichia stylata were dominant at AR19 and AR20. [downstream of the reservoir]" The United States Geological Survey (USGS) National Water Quality Assessment Data Warehouse (NAWQA) shows this species is present in Gunnison County. Data as of 1Sep2005 |