Trichoptera: Glossosmatidae of Gunnison County, ColoradoAgapetus boulderensisMilne, 1936Updated 3 March 2009 Good LinksOn this website:Glossosoma introduction Other Websites: ReferencesCanton,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: "Glossosomatids (Glossosoma ventrale and Agapetus boulderensis) were abundant at both locations. At C2 (upstream of mine) the comprised 33% of the trichopterans; at C4 (below the mine) they clearly dominated the caddisfly community with increased abundance of both species, and accounted for 64% of the density." 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 1975-2749 m and adult collection dates are 3 August to 2 October. Quote from page 425 "Our data show this species to be more widespread in Colorado than previously reported." They list this species as present in Gunnison county. Hoffman, AL; Olden, JD; Monroe,JB; Poff, NL; Wellnitz,TA; and Wiens, JA 2002 The roles of benthiscape patchiness and stream flow in shaping herbivore movements. Presented at the NABS Annual meeting, Pittsburgh, Pennsylvania, in Landscapes abstract Mecom, John O. 1972a Feeding habits of Trichoptera in a mountain stream. Oikos 23: 401-407. Agapetus larvae ate diatoms or detritus, changing with the seasons. Milne, L.J. 1936 Studies in North American Trichoptera. Part 3. Cambridge, Mass. : Author's publication. 128 pages Olden,JD; Hoffman, AL; Monroe,JB and Poff, NL 2002 Movement mechanics and behavior of an herbivorous insect larvae across complex benthiscapes. Presented at the NABS Annual meeting, Pittsburgh, Pennsylvania, in Landscapes abstract Olden, JD; Hoffman, AL; Monroe, JB; and Poff, NL. 2004 Movement behaviour and dynamics of an aquatic insect in a stream benthic landscape. Canadian Journal of Zoology 82:1135-1146. PDF. Poff, N.L., and J.V. Ward. 1992 Heterogeneous currents and algal resources mediate in situ foraging activity of a mobile stream grazer. Oikos 65:465-478. PDF Ross, HH 1951 Phylogeny and biogeography of the caddisflies of the genera Agapetus and Electragapetus (Trichoptera: Glossosomatidae) Journal of the Washington Academy of Sciences 41 (11) 347-356. Ross, HH 1956 Evolution and classification of the mountain caddisflies. University of Illinois Press, Urbana, 213 pages. Voelz,NJ; Poff,NL; Ward,JV 1994 Differential effects of a brief thermal disturbance on caddisflies (Trichoptera) in a regulated river. American Midland Naturalist 132 1, 173-182. abstract |