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 165 for “"Detritus"”.
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Scotland’s blue carbon: the contribution from seaweed detritus
… thesis focused on: 1) Quantifying the amount of detritus produced by species in Scottish macroalgae habitats and providing annual figures of total carbon leaving kelp forests in fluxes, 2) understanding the processes of degradation of detritus from three dominant kelp species and estimating the …
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Sources and supply of kelp detritus : quantifying mechanisms of production
… Despite the extensive body of work on kelp detritus as a trophic subsidy, many questions remain about the production of this detritus. The aim of this thesis was to determine the rate and mechanisms of kelp detritus production, for Ecklonia radiata, the dominant kelp species in temperate …
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The contribution by phytoplankton, bacteria and detritus to a rocky shore ecosystem
… standing stocks of hytoplankton, bacteria and detritus were monitored for 13 months, at three localities on the reef, on incoming and outgoing tides. A number of seasonal trends recharge, despite day-to-day variation in t."'1ese stocks. In spring and summer chlorophyll levels were la, 1 - 2 …
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Behavioural and physiological ecology of the Namib Desert dune ant, Camponotus detritus emery
The ecology of Camponotus detritus was examined over two years at six sites across the Namib Desert. This common species was found to fill an important role in the dune ecosystem as the major honeydew consumer, apparently limited chiefly by intraspecific competition for food. Each colony, …
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Species distribution, phylogenetic structure and functional roles of detritus inhabiting fungi across contrasting aquatic environments
… and phylogeny influence the structure of detritus-inhabiting fungal communities within temperate peatland and alkaline stream habitats. In addition, this research utilized traditional agar-based assays, fluorometric assays, and sequence-based methods to: 1) link community function to …
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Characterization of the autotrophic component in periphyton upon <i>Typha angustifolia</i> detritus in a freshwater wetland
… of periphyton on <em>Typha angustifolia</em> detritus was characterized in a freshwater wetland during a single growing season. 58 genera of algae and cyanobacteria, representing six divisions, were observed throughout the study period. Although the combined algae-cyanobacteria density from …
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Influence of Detritus Levels and Organic Pollution on Interspecific Resource Competition, Oviposition Behavior, and Larval Survival of Two Tire-Inhabiting Mosquito Species (Diptera: Culicidae)
<p>Mosquitoes (Diptera: Culicidae) are vectors of disease in the adult stage, but understanding the factors affecting distributions of the immature stages is important to the understanding and control of adult populations. Discarded automobile tires comprise important larval mosquito habitats. The …
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Assessing potential navigation impacts to the Kanawha river ecosystem: a modeling approach
… a variety of foods including considerable detritus. These groups accounted for 73 to 83% of total ichthyomass and 81% of total adult production. Total fish consumption at the more riverine upper site was partitioned into 35% l detritus, 28% invertebrates, 20% plant matter, 12% other fish, …
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The impact of seasonally changing feeding habits on the secondary production and accumulation of mercury in a filter-feeding Caddisfly
… October, when feeding nets were widespread, detritus formed the bulk of the diet in terms of both numbers of particles and volume occupied. From November through March however, the algal component dominated in terms of numbers of particles although the detritus component still occupied a …
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The Middle Ordovician Knox unconformity, Virginia Appalachians: transition from passive to convergent margin
… 65 m below the unconformity and are filled with detritus from the unconformity and breccia from host carbonates, and sub-unconformity dolomite breccia bodies that formed by collapse after dissolution of limestone interbeds. Coarse detritus on the unconformity surface formed thin to thick veneers …
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The impact of macrophyte mats on biodiversity and ecosystem functioning of benthic communities
… sheets. Once these sheets start to decompose, detritus is formed, which is eventually incorporated into the benthic food web; however, the ability to process detritus is dependent on the species present. This thesis examined the impacts of Ulva on the benthic macrofaunal communities and …
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A multi-technique provenance study of the Oligocene : recent Nile cone sediments and River Nile hinterland
… modern Nile is dominated by the input of basic detritus from the Cenozoic Ethiopian Large Igneous Province. Detrital zircon signatures are dominated by variations in bedrock lithology, and the availability of easily-eroded Phanerozoic cover sediments. These represent an important source of …
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Compositional heterogeneity within oceanic POM : a study using flow cytometry and mass spectrometry
… was used to isolate "phytoplankton" and "detritus" (i.e., non-phytoplankton particles) in 2~53 !liD POM. The molecular-level differences between and within small-particle POM (<53 !liD), large-particle POM (>53 !liD), "phytoplankton" and "detritus" were explored using DT -MS and …
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The ecology and population biology of two litter decomposing basidiomycetes
… on a wide variety of coniferous and hardwood detritus. Collybia subnuda (Ellis ex. Peck) Gilliam is dominant on northeast facing slopes, and occurs on hardwood leaves and small woody detritus. The population structure of both of these species was investigated using tests of somatic …
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Short-term effects of defoliation by gypsy moth larvae on Appalachian headwater streams in Virginia
… was a significant increase in the amount of detritus (frass and orts) falling into defoliated streams in the spring, which was followed by a significant decrease in the of amount detritus falling into defoliated streams in autumn. Many measures of community structure were analyzed, but only …
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Ecological Stoichiometry: What Role Does it Play in the Competition and Spatial Distribution Patterns of <i>Aedes Albopictus</i> and <i>Aedes Aegypti</i>?
… across different levels of organization. Detritus is the base of the food web within the small aquatic ecosystems occupied by the mosquitoes <em>Aedes albopictus</em> and <em>Aedes aegypti</em>. Nutrient content of detritus varies, but it can have a negative effect on mosquito growth and …
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Selenium Dynamics in Headwater Streams of the Central Appalachian Coalfields: An Investigation of Enrichment and Bioaccumulation
… Water-column, sediment, biofilm, leaf detritus, and prey and predator macroinvertebrates were collected and analyzed for Se concentration during two sample periods, Sept. - Oct. 2015 and Feb.-March 2016. Selenium concentrations in all media were found to be elevated in mining-influenced …
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Effects of native forest and pastoral land use on the population dynamics and trophic role of the New Zealand freshwater crayfish Paranephrops planifrons (Parastacidae)
… than in native forest streams where leaf detritus dominated stomach contents. In laboratory growth experiments, invertebrate food sources increased the moult increment of juvenile crayfish and decreased the length of the intermoult period, whereas conditioned leaf litter did not promote …
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Heavy metals partitioning in a stream receiving urban runoff
Water, sediment, detritus, caddisflies, snails, and crayfish were collected from Bull Run between July 31 and October 2, 1977 and analyzed for Fe, Mn, Ni, Pb, Cd, Zn, Cr, and Cu by atomic absorption spectrophotometry after appropriate digestion and extraction procedures. The samples were collected …
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After Horses
… of how to create meaning from the fracture and detritus of daily life. Also under obsessive consideration throughout: loneliness, the risk of human connection, the risk of a lack of human connection, the impossibility of language, hope as illuminating and good thing, hope as desperate and …
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