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 45 for “"sampling effort"”.
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Escherichia coli Strain Diversity in Humans: Effects of Sampling Effort and Methodology
… hosts are frequently inconsistent regarding sampling effort and methodology while current strain typing methods are often expensive or laborious. To rectify these inconsistencies, sampling effort was investigated by comparing the diversity of 15-isolate collections to 100-isolate collections …
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Quantifying changes in macroinvertebrate community composition, biomass, and emergence in response to mining-induced salinization in central Appalachian streams
… webs. However, taxa observed are dependent upon sampling effort that could bias diversity-process interpretation. Taxon sampling curves can be used to estimate sampling effort that maximizes the probability of complete community characterization. We sampled six streams in the Central Appalachian …
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Predicting South Africa 's true marine biodiversity : a comparison of methods
… and which areas are most in need of additional sampling effort.
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Landscape scale measurement and monitoring of biodiversity in the Australian rangelands
… the survey data, and to remove the influence of sampling effort. Data were aggregated by biogeographic region, rarefaction was used to remove most of the influence of sampling effort, and additional correction removed the residual influence of sampling effort. Finally, additive partitioning of …
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Exploring optimising strategies for sampling air-sea carbon dioxide flux in the southern ocean
… undertaken to investigate the optimization of sampling strategies for returning low-uncertainty sea-air CO₂ flux measurements in the Southern Ocean. Replicating Lenton et al. (2006) using the ORCA2/PISCES ocean biological model shows that sampling 4 times a year, every 2⁰ in latitude and every …
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An evaluation of SASS (South African scoring system) as a tool for the rapid bioassessment of water quality
… biological assessment, namely quantitative box-sampling and SASS. The ability of each method to differentiate between these sites was determined. The more general application of SASS in the south-western Cape was examined at forty nine sites and potential problems associated with SASS, namely …
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Using population ecology to inform the conservation of Nevada's rare plants
… approaches have attempted this by altering sampling designs to account for heterogeneity, however model-based approaches could also be useful to estimate population size of heterogeneously distributed species but have so far not been examined. In chapter 1, I tested the ability of a …
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Sampling methodology tradeoffs: evaluating monitoring strategies for the endangered humpback chub (Gila cypha) in the Little Colorado River, Arizona
… become available. To assess tradeoffs in sampling effort first necessitates obtaining accurate demographic parameter estimates. However, obtaining such estimates may be challenging especially when assessing a migratory species monitored on its spawning ground. Due to concerns regarding …
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Improving the Use of Migration Counts for Wildlife Population Monitoring
… count data with known trend, I tested whether sampling effort (daily vs. non-daily sampling) and a temporal change in stopover duration (and thus detection probability) influenced our ability to estimate the known trend. I also tested whether analyzing data as hourly, daily or annual counts, or …
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Studies on the diversity and spatial distribution of deep-water sponges along the west and south coasts of South Africa
… and 200 m for the south coast. However, the sampling effort was determined to possibly have not been enough to gain a full understanding of species richness for the entire study area as the number of species was correlated with sampling effort. Estimated richness found that higher richness of …
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Vegetation Dynamics of an Old-growth Mixed Mesophytic Forest in Southeastern Ohio, USA
… Here, results are presented from the second sampling effort at Dysart Woods, an old-growth, mixed-mesophytic remnant tract in southeastern Ohio. In 2011, trees, saplings, shrubs, herbs, and soils were sampled in permanent plots established in 1996, allowing a direct fifteen–year comparison. …
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Sampling adequacy of freshwater mussel surveys and variation of mussel species richness in Illinois wadeable streams
… local mussel assemblages. However, sampling protocols for mussel surveys, including sampling efforts, have not been well established and tested. Furthermore, the percentage of all species captured with a standard sampling effort (e.g., search of man-hours) may vary greatly among …
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Results and Evaluation of An Aerial Creel Survey Technique On Lake Sharpe, South Dakota
… allowed optimum stratification and allocation of sampling effort for each. Estimated fishing pressure was 32,643 fisherman-hours, ±9.60% at the 95% confidence level, and the total estimated harvest was 113,800 fish, ±12.46%, weighing 7.36 x 104 kg (81.05 tons). The mean catch rate for the entire …
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Ecology of Mid-Atlantic bats after white-nose syndrome: communities, reproduction, and diet within an urban-to-rural gradient
… the area with mist netting and active acoustic sampling (2016–2018) and compared findings to pre-WNS (2003–2004) data. I documented a significant reduction in the numbers and distributions of M. lucifugus and P. subflavus, a decrease in the distribution of M. septentrionalis, and an increase in …
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Characterization of Antibiotic Resistance in <i>Vibrio cholerae</i> Isolated From Ships' Ballast and Other Environmental Sources
… carried on mobile genetic elements. A four-year sampling effort has yielded over 300 putative isolates of <em>Vibrio cholerae</em> from ships' ballast tanks and various environmental sources, of which 208 have been profiled for antibiotic susceptibility using twelve diverse antibiotics. The …
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Detection of non-native freshwater fishes using environmental DNA
… methods to detect non-native freshwater fish. Sampling methods and species-specific primers were developed for pumpkinseed Lepomis gibbosus, topmouth gudgeon Pseudorasbora parva, sunbleak Leucaspius delineatus, and fathead minnow Pimephales promelas. All four species were detected within 24 …
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Geomorphic Assessment and Flow Modeling of Pearl Darter (Percina aurora) Habitat in the Pascagoula River Watershed
… same watershed, and Pearl Darter occurrence, and sampling effort, differed by sandbar morphological traits. For reproductive habitat, we found that mean velocity is likely an important factor in habitat preference. Additionally, we propose that the updated reproductive habitat description is …
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Fractal relationships and spatial distribution of ore body modelling
… maximum confidence in the results and minimum sampling effort. The principal aim of almost every geostatistical modelling process is to predict the spatial variation of one or more geological variables in order to estimate values of those variables at locations that have not been sampled. From …
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Efficacy and biases In inspections for biosecurity threats In South Africa
… the need to improve inspection strategies and sampling efforts to increase the effectiveness of border controls in South Africa. To promote good biosecurity, further studies should be conducted to analyse control bias based on sampling effort data than interceptions relative to TV, to improve …
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Ecology and biogeochemistry of fluvial microphytobenthic communities on soft sediments
… needed on natural MPB communities, with greater sampling effort required to overcome heterogeneity.
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