Trichoptera: Limnephilidae of Gunnison County, ColoradoHesperophylax occidentalis - Silver Striped Sedge(Banks) 1908Updated 19 Jun 2011
TSN 116006 NotesScientific papers from the first 60 years of the 20th century refer to this animal as Platyphylax occidentalis.Good LinksOn this website:Introduction to the Limnephilidae Other Websites: Photos, Map, Museum specimens, DNA - Barcodinglife.org Seriochemicals of the genus Hesperophylax http://www.pherobase.com/database/genus/genus-Hesperophylax.php ReferencesBanks, N. 1908 Neuropteroid insects - notes and descriptions. Transactions of the American Entomological Society 34:255-267.Described as Platyphylax designata var. occidentalis. 
Bergey,EA and Ward,JV 1989 Upstream-downstream movements of aquatic invertebrates in a Rocky Mountain stream, Hydrobiologia, Volume 185( 1) 71-82. Abstract Helicopsyche borealis and Hesperophylax occidentalis were the only species to show a net upstream movement during the course of this study. 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 Bjostad,LB, Jewett,DK and Brigham,DL 1996 Sex pheromone of caddisfly Hesperophylax occidentalis (Banks) (Trichoptera: Limnephilidae). Journal of Chemical Ecology 22:103-121. Abstract: " The main component of the sex pheromone of the caddisfly Hesperophylax occidentalis (Banks) (Trichoptera: Limnephilidae) was identified as 6-methylnonan-3-one (enantiomeric composition has not yet been determined). Extracts of adult females elicited strong electroantennogram (EAG) responses from adult male antennae, but elicited significantly smaller EAG responses from adult female antennae. Extracts of adult males did not elicit appreciable EAG responses from antennae of either sex. Racemic 6-methylnonan-3-one was synthesized and elicited EAG responses from male antennae as strong as those obtained with female extracts. In field tests with baited sticky traps near lakes and streams, traps baited with synthetic racemic 6-methylnonan-3-one caught significantly more males than control traps. Female adults contained approximately 1 µg of 6-methylnonan-3-one per individual. Related ketones and alcohols of other chain lengths were also tentatively identified, being present in tiny amounts in female extracts. Extraction of different body parts showed that 6-methylnonan-3-one occurs only in a region near the intersegmental membrane between the fourth and fifth abdominal sternites of the female (no discrete glands were observed). Extracts of males did not contain 6-methylnonan-3-one, nor did pupae of either sex." Gall,BG and Brodie,ED, Jr. 2009 Behavioral avoidance of injured conspecific and predatory chemical stimuli by larvae of the aquatic caddisfly Hesperophylax occidentalis. Canadian Journal of Zoology 87: 1009-1015. Herrmann,SJ; Ruiter,DE; Unzicker,JD 1986 Distribution and records of Colorado Trichoptera. Southwestern Naturalist 31 4, 421-457. The authors show this species is present in Gunnison County. Hornig,CE; Brusven,MA 1984 Effects of Mount St. Helens volcanic ash on leaf utilization by Hesperophylax occidentalis (Trichoptera: Limnephilidae). Journal of the Idaho Academy of Science 20:1-10. Hornig,CE and Brusven,MA 1986 Effects of suspended sediment on leaf processing by Hesperophylax occidentalis (Trichoptera: Limnephilidae) and Pteronarcys californica (Plecoptera: Pteronarcidae). Western North American Naturalist 46 (1) Abstract: "The effects of suspended sediments on stream invertebrate detrital processing were investigated under replicated conditions in light and temperature-controlled chambers in the laboratory. The leaf-shredding insects Pteronarcys californica and Hesperophylax occidentalis were studied. Mean daily ingestion rates were lower among insects subjected to suspended sediments (1.5 and 3.0 g/l) than insects held in suspended sediment-free environments for seven of the eight trials. In five of the eight trials, mean ingestion rates were suppressed by ?41% when compared to insects held in suspended sediment-free environments. Feeding inhibition was typically greater at the end of the feeding trials (14 days) than at the beginning (0–4 days). The effects of suspended sediments on ingestion were apparently related to the feeding status of the insects at the time of a trial. Insects in an active feeding mode were less influenced by suspended sediment than those in an inactive feeding mode. We conclude that, depending on the season and the duration of impact, suspended sediment can suppress processing of coarse particulate organic matter and thus adversely influence important nutrient and energy pathways in low-order streams. " Jewett D, Brigham DL, Bjostad LB. 1996. Hesperophylax occidentalis (Banks)(Trichoptera: Limnephilidae) sex pheromone structure-activity study with electroantennograms. J. Chem. Ecol. 22: 123-138. Kolar, CS and Rahel, FJ 1993 Interaction of a biotic factor (predator presence) and an abiotic factor (low oxygen) as an influence on benthic invertebrate communities. Oecologia 95(2) 210 - 219 DOI: 10.1007/BF00323492 Martinson,RJ; Ward,JV 1982 Life history and ecology of Hesperophylax occidentalis (Banks) (Trichoptera: Limnephilidae) from three springs in the Piceance Basin, Colorado. Freshwater Invertebrate Biology 1:41-47. Parker, CR and Wiggins,GB 1985 The nearctic caddisfly genus Hesperophylax (Trichoptera: Limnephilidae). Canadian Journal of Zoology 61(10): 2443-2472. Abstract Hesperophylax spp. taxonomy, distribution, diet, phylogeny and biogeography are discussed. Wissinger, S.A., W.S. Brown, and J.E. Jannot. 2003 Caddisfly life histories along permanence gradients in high altitude wetlands in Colorado (U.S.A.). Freshwater Biology 48(2). Abstract  (427 KB)Wissinger, S.A. and C. Eldermire and J.C. Whissel 2005 The role of larval cases in reducing aggression and cannibalism among caddisflies in temporary wetlands. Wetlands 24(4) 777-783. Abstract Brown, Wendy S. 2005 Trichoptera (Caddisflies) of Gunnison County, Colorado, USA www.gunnisoninsects.org |