Trichoptera: Brachycentridae of Gunnison County, ColoradoBrachycentrus occidentalis
Early grannom, Mother's Day Caddis Banks 1911
Updated 1 June 2009
TSN 116918
Links
On this website:
Brachycentrus americanus
Other Websites:
Photo - from Midwest Fly Fishing Online http://www.mwfly.com/pages/ento.html
Arkansas River Hatch - from the Denver Post http://www.denverpost.com/news/ci_3700264
Yellowstone River Hatch - The Mother's Day Hatch http://www.yellowstoneflyfishing.com/caddisflies.htm
After a good discussion of fishing and caddisfly hatches they talk about B. occidentalis partway down the page.
Illustration - University of Alberta Entomology Collection Species page
Has illustration of male genitalia, description, habitat information, range and more.
References
Banks,N 1911 Descriptions of new species of North American Neuropterid Insects. Transactions of American Entomological Society 37, 335-360.
Describes this species on page 355, and illustrates it on plate 13 and figure 32.
Flint, O. S., Jr. 1984 The genus Brachycentrus in North America, with a proposed phylogeny of the genera of Brachycentridae (Trichoptera). Smithsonian Contributions to Zoology 398:1-58.
Flint, O. S., Jr. 1984. On the genus Brachycentrus (abstract). Pages 143 in Proceedings of the 4th International Symposium on Trichoptera (J. C. Morse, ed.) Dr. W. Junk, The Hague.
Gallepp,GW 1974 Behavioral ecology of Brachycentrus occidentalis Banks during the pupation period. Ecology, Vol. 55(6) 1283-1294. Abstract and first page
Gallepp, G. W., Jr. 1975 The behavioural ecology of larval caddisflies, Brachycentrus americanus and Brachycentrus occidentalis. Dissertation Abstracts International 35: 4532.
Gallepp, G. 1976 Temperature as a cue for the periodicity in feeding of Brachycentrus occidentalis (Insecta: Trichoptera). Animal Behaviour 24: 7-10.
Gallepp,GW 1977 Responses of caddisfly larvae (Brachycentrus spp.) to temperature, food availability and current velocity. American Midland Naturalist 98(1)59-84. Abstract
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 1615 to 2926m and adult collection dates are 16 April to 6 July.
Quote from page 425: "In Colorado this species is usually more common below 1829m while B. americanus more common above 1829m; B. occidentalis also seems to ewerge earlier." They list this species as present in Gunnison county.
Hauer,FR; Stanford,JA 1986 Ecology and co-existence of two species of Brachycentrus (Trichoptera) in a Rocky Mountain River. Canadian Journal of Zoology 64 7, 1469-1474.
Studying the Flathead River of Montana for three years, the authors found that B. occidentalis larvae appeared as early instar larvae in mid to late summer and overwintered as 4th or 5th instar larvae. They were active until spring runoff and pupated in May and June. B. occidentalis emerged as adults during August and September. They avoided competition with Brachycentrus americanus larvae by slightly staggered life cycles, with adults of B. americanus emerging in late summer and early fall.
Hauer,FR; Stanford,JA; Ward,JV 1989 Serial discontinuities in a Rocky Mountain river. II. Distribution and abundance of Trichoptera. Regulated Rivers: Research and Management 3, 177-182.
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
Voelz,NJ; Ward,JV 1996a Microdistributions, food resources and feeding habits of filter-feeding Trichoptera in the Upper Colorado River. Archiv fur Hydrobiologie 137 3, 325-348.
Voelz,NJ; Ward,JV 1996b Microdistributions of filter-feeding caddisflies (Insecta:Trichoptera) in a regulated Rocky Mountain river. Canadian Journal of Zoology 74, 654-666.
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
Wetmore, S. H., Mackay, R. J., Newbury, R. W. 1990 Characterization of the hydraulic habitat of Brachycentrus occidentalis, a filter-feeding caddisfly. Journal of the North American Benthological Society 9: 157-169.
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