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Trichoptera: Hydroptilidae of Gunnison County, Colorado

Hydroptila ajax

Ross 1938

Updated 15 Feb 2016
TSN 115643

Good Links

On this website:
Introduction to Hydroptilidae

Other Websites:
Photos, Map, Museum specimens, DNA - Barcodinglife.org

Photo - Mandibles from http://inverts.cmnh.org/Ent_Hydroptilid_morph.htm

PAN Pesticides database: http://www.pesticideinfo.org/List_AquireAll.jsp?Species=5259


Blinn,DW and Ruiter,DE 2006 Tolerance values of stream caddisflies (Trichoptera) in the lower Colorado river basin, USA. The Southwestern Naturalist 51(3):326-337.
     Abstract: " One hundred and four caddisfly species within 42 genera and 17 families were collected from 93 stream sites in the xeric landscape of the lower Colorado River Basin, USA. Species richness showed a significant negative correlation with channel embeddedness. Forestland had higher species richness than grassland, desert, or urban caddisfly assemblages, and fewer caddisfly species occurred in the salt-cedar (Tamarix) than in willow-alder (Salix-Alnus) and cottonwood-sycamore (Populus-Plantanus) riparian communities. Hydroptilidae comprised nearly 35% of the average relative abundance of caddisflies and were generally tolerant of impaired stream environments. Hydroptila arctia composed the greatest relative proportion of species. Adjusted specific conductance and channel embeddedness metrics showed close agreement with published tolerance values for caddisfly species listed by the U.S. Environmental Protection Agency; genera were in less agreement. Amphicosmoecus canax, Brachycentrus americanus, Culoptila moselyi, Glossosoma ventrale, Ochrotrichia ildria, Psychoglypha schuhi, and Ylodes reuteri were most commonly associated with streams with low salinities and low embeddedness, whereas Cheumatopsyche enonis, Hydropsyche auricolor, Hydroptila ajax, Hydroptila arctia, Neotrichia okopa, Smicridea signata, and Smicridea fasciatella reached highest numeric importance in streams with high salinities and embeddedness. "

Cobb, DG, Flannagan,JF 1990 Trichoptera and substrate stability in the Ochre River, Manitoba. Hydrobiologia, 206 (1)29 - 38. DOI 10.1007/BF00018967 Abstract

Herrmann,Scott J; Ruiter,Dave E; Unzicker,John D (1986): Distribution and records of Colorado Trichoptera. Southwestern Naturalist 31(4), 421-457.
     shows this species is present in Gunnison County

Ross, HH 1938 Descriptions of Nearctic Caddisflies. Bulletin of the Illinois Natural History Survey 21:101-183.

Ruse,LP and 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. PDF
     H. ajax was found at one site above and two sites below the Pueblo dam in the Arkansas river. 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]"

Brown,WS 2006 Trichoptera (Caddisflies) of Gunnison County, Colorado, USA