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.
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Showing 1 to 20 of 23 for “"shredders"”.
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The role of shredders in detrital dynamics of permanent and temporary streams
… 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 …
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Influences of land use on the structure and function of headwater streams: A multiple scale analysis
… 1 km. Results suggest that the distribution of shredders is critical to leaf processing in these streams. In some streams, increased sediment inputs as a result of agricultural activity or residential development in riparian corridors may limit the distribution of shredders and thus influence …
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Effects of Hydrologic Gradients on Woody Debris Breakdown and Macroinvertebrate Colonization in a Cumberland Plateau Watershed, Eastern Kentucky, U.S.A.
… of all taxa colonizing wood bundles, followed by shredders (16.1%, 16.8%), predators (16.8%, 20.1%), (scrapers < 0.1% in both reaches) and filtering collectors (1.2%, 3.7%). Overall, there were no significant between-channel differences for total macroinvertebrate abundance, total …
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Effects of forest disturbance on shredder production in headwater streams
… Pycnopsyche may be more capable than the other shredders of exploiting fast-processing, early successional leaf species. Pycnopsyche production was greatest in streams having the greatest quantities of early successional leaf biomass. Pycnopsyche biomass correlated significantly with …
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Transport and decomposition of allochthonous litter in Icelandic headwater streams: Effects of forest cover
… correlated with the number of Plecoptera (shredders) found in the litter bags. This could indicate a different feeding activity of the group in Iceland and needs to be studied further. The number of taxonomic groups found in the litter bags was higher in birch than in conifer forest …
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Microbial activity on wood in streams: exploring abiotic and biotic factors affecting the structure and function of wood biofilms
… of wood biofilms as a food resource for shredders. There were no differences in Jallaperla growth rates on wood and leaves, and Tallaperla grew equally well on wood incubated for 1 or 2 months. At the end of each study, fungal biomass on wood in the feeding chambers was not different from …
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INFLUENCES OF DISEASE-DRIVEN AMPHIBIAN DECLINES ON ECOSYSTEM STRUCTURE AND FUNCTION IN PANAMANIAN HEADWATER STREAMS
… composition and molar ratios in grazers and shredders varied, with pronounced differences in %N for gatherers and filterers across sites. Macroinvertebrate grazer elemental composition was higher for all elements and had lower C:N, N:P, and C:P molar ratios in pre-decline sites compare to …
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Chironomidae Contributions to the Macroinvertebrate Assemblage, Index of Biotic Integrity and Relationships to Water Quality Impairment for Eastern South Dakota Streams
… abundant chironomid genera. Collector-gatherers, shredders, burrowers, and climbers were abundant functional guilds and the mean Hilsenhoff biotic index (HBI) was 6.6 among chironomid assemblages. Percent Tanytarsini, climbers, shredders, and HBI were significantly correlated with total suspended …
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Estudo da distribuição espaço-temporal da comunidade de larvas de Trichoptera Kirby, 1813 (Insecta) em um tributário de primeira ordem do rio Paquequer, Teresópolis, RJ
… values of frequency and biomass were highest for shredders on litter from pools, collectors on litter from riffles, predators on sand and scrapers on stones.
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The diet and growth of a leaf-shredding caddisfly, Pycnopsyche, in streams of contrasting disturbance histories
… (e.g., black birch) because leaf-eating insects (shredders) in a previous study were more productive in these streams despite having less food available. Larvae consumed mostly unidentified plant material in streams of both forest types over three seasons (fall, winter, and spring) which suggested …
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Aquatic Macroinvertebrate Production in Predominant Habitats of a Warmwater Stream: The James River, South Dakota
… using numbers, biomass, and production. Shredders predominated on snags and gathering collectors in benthic habitats. When corrected for habitat abundance, community structure consisted primarily of gathering collectors and to a lesser extent predators. As a high-order (> 6) stream, the …
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Impacts of Land-Use on Leaf Breakdown and Macroinvertebrate Assemblages in Southern Appalachian Streams
… matter processing. The taxa and number of shredders present may play a role to a lesser extent. Impacts of land-use on macroinvertebrate assemblages are examined in Chapter 2. Shannon diversity, %EPT, and NCBI were significantly related to land-use regime. There were significant negative …
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Recovery of community structure and leaf processing in a headwater stream following use of a wetland passive treatment system to abate copper pollution
… while recovery of collector-gatherers and shredders was slower.
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Modeling methods for complex manufacturing systems : studying the effects of materials substitution on the automobile recycling infrastructure
… a similar vehicle without the aluminum chassis, shredders would have to offer 18¢/kg. for hulks, to preserve their profitability. Of the ASR processing technologies investigated, pyrolysis seems the most promising. Pyrolysis achieves profitability at a landfill price of $50/ton. In contrast, …
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Legacies of Early 20th Century Logging in Southern Appalachian Streams
… had significantly greater proportions of shredders while streams in logged catchments had significantly greater proportions of scrapers. Ecosystem parameters showed that the linkages between streams and the forests they drain were weaker in logged than unlogged streams and that unlogged …
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Skol ehf. : viðskiptagreining
… er við skaðleg efni eins og klór (Industrial Shredders, 2020). Nánar verður sagt frá því í kafla þrjú. Þannig hefði þetta rannsóknarefni bæði möguleg fjárhagsleg áhrif fyrir fjárfesti, en samtímis áhrif á umhverfið. Verkefnið skiptist þannig upp að fyrst er farið nokkrum orðum um framleiðslu …
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Microbial and metazoan effects on nutrient dynamics during leaf decomposition in streams
… nutrient recycling (CNR) and grazing by two shredders on microbial uptake under different N regimes. Animals only influenced microbial uptake under low N conditions. Shredder CNR generally stimulated uptake while grazing had a negative effect. My research provides a robust model describing N …
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Macroinvertebrate Community Response to Spatial Patterns of Water Quality and Habitat within Mining-influenced Headwater Streams of Appalachia
… habitat, and water quality. Of those 18 taxa shredders, collectors, and clingers were most frequently impacted. Improved understanding of the spatial scale of coal-mining influences on headwater stream characteristics will help inform bioassessment protocols to most accurately assess stream …
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The effect of resource stoichiometry on fish and macroinvertebrate nutrient excretion
… explained by the low N:P of seston. However, shredders, eating on a very low N and P diet of leaf detritus, had very low N and P excretion. The relationship between consumers, their food, and nutrient excretion is a matter of mass balance. If the food N:P ratio is higher than that of the …
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