Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"Caddisfly"”.
-
Forces Structuring Caddisfly Communities: Biogeographical to Anthropogenic Effects
… the relationships of richness of five focal caddisfly families with geographical and climatic predictors. I found that longitude was the most important predictor of richness, though the relationship had different directionality depending on family. Paleoclimate variables were also important …
-
The ecological energetics of the net-spinning caddisfly, Hydropsyche venularis Banks (Trichoptera: Hydropsychidae)
… energy budget equations for a net-spinning caddisfly, Hydropsyche venularis Banks, and to develop, or modify, methods used to determine consumption and growth in the field. The method used to determine consumption rate was a modification of the procedure used by Ladle et al. (1972). Growth …
-
The diet and growth of a leaf-shredding caddisfly, Pycnopsyche, in streams of contrasting disturbance histories
… the diet and growth of a leaf-eating caddisfly, Pycnopsyche, in streams draining a >60 year-old reference forest and a 16-year-old c1earcut (disturbed) forest at Coweeta Hydrologic Laboratory in southwestern North Carolina. The objective was to examine whether Pycnopsyche larvae grew …
-
Relative importance of Conservation Reserve Programs to mayfly, stonefly, and caddisfly species richness in the Kaskaskia River basin of Illinois
The Conservation Reserve (CRP) and Conservation Reserve Enhancement Programs (CREP), funded by federal and state government, offer farmers financial incentives to take erosive agricultural lands out of production. Within these program landscapes, several best management practices, including …
-
The impact of seasonally changing feeding habits on the secondary production and accumulation of mercury in a filter-feeding Caddisfly
Food habits, net-spinning activity, energetics, and mercury accumulation in Hydrospsyche morosa were examined over a one year period on the South River in central Virginia. Feeding nets were observed as early as April and were widespread by May. Nets were virtually absent from late November through …
-
The influence of mine waste contamination on invertebrates and fish in the Methow River Valley, Okanogan County, Washington (U.S.A.)
… and Alder Mill, (2) whether in vivo exposure of caddisfly larvae to Cu and As in microcosm chambers containing contaminated water and sediments induced nuclear apoptosis and the formation of electron-dense granules in the matrix of gut epithelial cell mitochondria, (3) whether in situ exposure of …
-
Pesticides in the Aquatic Environment
… egg stage of aquatic insects. Results from the caddisfly egg toxicity bioassay indicate that some insecticides and herbicides, at concentrations which are commonly found as residues in water in field situations, are embroyotoxic and/or teratogenic to eggs of the caddisfly T. tardus. Radioactive …
-
Dietary Effects on the Stoichiometry of Growth, Regulation, and Wastes of Ozark Stream Insect Detritivores
… stoichiometric regulation of the detritivorous caddisfly Pycnopsyche lepida and used results to determine a threshold elemental ratio of oak litter C:P=1620 that confers peak growth of this species. This empirical, growth-based approach provided a more accurate estimate of the threshold …
-
Freshwater Invertebrate Assimilation Nutrients from Detrital Biofilms Under Light and Phosphorus Manipulation
… to trace radiolabeled C and P into caddisfly tissues. I quantified microbial biomass and production rates, caddisfly consumption and egestion rates, and radiolabel assimilation, and incorporation efficiency. The results of my study report that 94-97% of detritivore C was incorporated …
-
Effects of Light and Macroinvertebrate Consumers on Detrital Microbial Biofilms in Streams
… <em>Macrobrachium ohione</em> and the shredding caddisfly <em>Pycnopsyche</em> sp. on <em>Liriodendron tulipifera</em> litter biofilms in experimental streams under light or darkness. I measured litter-associated algal, fungal and bacterial biomasses and production rates, as well as litter …
-
Assemblage characteristics and sampling considerations for aquatic macroinvertebrates inhabiting a lower Mississippi River stone dike
… chironomids, isopods, and clinging mayflies. The caddisfly, Hydropsyche spp., accounted for over 60 percent of the total organisms collected. A comparison of assemblage data obtained from the surface stones of the implanted substrates with data obtained from adjacent surface stones of the dike …
-
Submerged wood inhabiting macoinvertebrates of the Elm Fork of the Trinity River, Texas: Assemblage analyses, comparisons to the benthic fauna, and a study of Cyrnellus fraternus (Trichoptera: Polycentropodidae)
… analysis of a population of the caddisfly Cyrnellus fraternus. Distributions of C. fraternus were restricted to snags, the most stable substratum for retreat building and for resisting periodic high waters. Larvae were not found in the soft sand and mud benthic habitats near …
-
Studies on the Odonata and Trichoptera of high-elevation lakes of northern Colorado and southern Wyoming
… records, resulting in 541 confirmed records of caddisfly species. Forty-nine species, representing 24% of all known Colorado caddisflies are documented. Seven families and 24 genera are represented. The Limnephilidae comprised 76% of the 49 recorded species. The other six families were usually …
-
An Ecotoxicological Assessment of a Treated Coal-mining Effluent in the Leading Creek Watershed, Meigs County, Ohio
… (EPT) minus the tolerant caddisfly family Hydropsychidae (2) in situ growth of Corbicula fluminea during 96-d exposure and (3) laboratory testing using Ceriodaphnia dubia. Traditional metrics such as total taxa richness, EPT, diversity and biotic indices were not sensitive …
-
Factors affecting growth and condition of stocked rainbow trout in eastern Washington lakes
… the variables maximum lake depth (Zmax), autumn caddisfly larvae biomass, and autumn dipteran density. Rainbow trout condition factor compared with spring measures was inversely proportional to Zmax and rainbow trout stocking density. Both variables explained 51% of the spring lake-to-lake …
-
Organic Matter Dynamics and Trophic Structure in Karst Groundwater
… consumption of epilithic biofilms. An epigean caddisfly, Dolophilodes, was highly labeled and probably feeds on suspended organic matter. Other primary consumers, Gammarus minus and Caecidotea holsingeri, feed on FBOM and epilithon. Two amphipods, Stygobromus emarginatus and S. spinatus, and a …