Thesis (M. Ed.)--Kutztown University of Pennsylvania, 1990. / Source: Masters Abstracts International, Volume: 45-06, page: 3051. Typescript. Includes bibliographical references (leaves 42-46).

Thesis (Ph. D.)--University of Missouri-Columbia, 1996. / Typescript. Vita. Includes bibliographical references (leaves 97-105). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 1996. / Typescript. Vita. Includes bibliographical references (leaves 97-105). Also available on the Internet.

Trout were introduced into a flow-through enclosure constructed in the headwaters of a small fishless stream to examine the effects of trout predation on the density, standing crop and production of lotic insect populations. Following the trout introduction, the density and standing crop of 3 of the 9 insect species examined decreased in the experimental stream study section (enclosure) while the density and standing crop of 2 insect species increased in the experimental stream section compared with the control stream section. Data on the food habits of the trout indicated that trout predation had reduced the density and standing crop of these insect populations in the experimental stream section. Competitive release was suggested as the reason for the increase in density and standing crop of the insect populations in the experimental stream section. The role of trout predation in structuring stream insect communities is briefly discussed. Production estimates of lotic species in the experimental stream section were not significantly different from those in the control section. Trout consumed only 0.4 times the mean standing crop or 9-10% of the production of prey species. However, trout were thought to be intensively grazing the available food supply. / Science, Faculty of / Zoology, Department of / Graduate

No description available.

No description available.

No description available.

The goals of this study were 1) to integrate several aspects of detrital dynamics with the composition and production of shredder populations and 2) to present evidence of a shredder regulatory role in headwater strewn detrital dynamics. The importance of leaf shredding aquatic insects (shredders) in the breakdown of leaf detritus and production of particulate organic matter (POM) was evaluated in three permanent and three temporary southern Appalachian headwater streams. Shredder population dynamics were compared to several stream detrital parameters: CPOM breakdown rates, POM concentrations, average POM particle sizes, and POM transport. In general, permanent streams with the greatest shredder densities, biomass, and annual production rates had the fastest leaf breakdown rates, highest low-flow POM concentrations, largest average POM particle sizes and greatest POM transport estimates. Temporary stream environments depressed shredder populations resulting in a reduction of detrital processing and POM transport. Microbial activity, stream velocity, base-flow discharge, and water temperature did not correlate with detrital parameters for comparisons between permanent and temporary streams. Shredder contribution to total benthic CPOM breakdown in the six study streams ranged from 31% in a permanent stream to 1% in a temporary stream. / Ph. D.

Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 61-65). Also available on the World Wide Web.

Stonefly life histories were studied March, 1987 through May, 1990 in the Rio Conejos, Colorado. Adult presence phenology and intensity were monitored daily in the summers of 1988 and 1989 and were coupled with monthly benthic samples to assess nymphal growth. Eggs of several species were reared. Thirty-one species were collected, with several multi-species assemblages occurring in Capnia, Utacapnia, Taenionema, Suwallia, Triznaka, Isogenoides and Isoperla. Sufficient data were obtained to reveal partial or complete life histories of 13 species, five of which have not been previously reported. New information included the 9- to 10-mo egg diapause and semivoltine life histories of Isogenoides zionensis Hanson, Pteronarcella badia (Hagen) and Pteronarcys californica Newport. Additionally, Isoperla phalerata (Smith) had univoltine-slow growth, and L quinquepunctata (Banks) was univoltine-fast. Previously unstudied emergence periods are presented for Triznaka signata (Banks), Suwallia wardi Kondratieff and Kirchner and S. pallidula (Banks). The later two species temporally segregated emergence in both years. Isoperla fulva Claassen emerged in June, and was temporally segregated from its congeners. Regression analysis of cumulative percentage catch revealed two adult presence patterns. Eight species had slopes <7%/d (extended pattern), and only two, I. zionensis and P. cal'fornica, had slopes >7 %/d (synchronous pattern). Several stoneflies were more abundant in Massey Creek, a tributary of the Rio Conejos. The emergence and diversity of mayflies, stoneflies and caddisflies was studied there. During May-August, 1989, 46 species were collected using sweepnetting and emergence traps. Chloroperlid stoneflies were abundant, with Suwallia nr. lineosa (Banks) contributing 37% of the total catch. Slopes of adult presence ranged from 1.7 %/d for Epeorus alberta (McDunnough) to 6.2%/d for Rhyacophila pellissa Ross. Separation of patterns was more difficult here, but < 4%/d was used as a criterion for extended emergers. A cluster analysis of 17 species produced three clusters that corresponded to stream temperature as a cue for emergence.