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 29 for “"Environmental Covariates"”.
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Detection, habitat use, and occupancy dynamics of Black-billed Cuckoos and Yellow-billed Cuckoos in Illinois
… the influence of call broadcast and temporal and environmental covariates on detection probability and effects of habitat covariates on occupancy, immigration, and emigration. Detection probability increased substantially using call broadcasts (up to 6 and 12 times for Yellow-billed and …
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The role of genomic selection and advanced statistical modeling in domesticating perennial sorghum
… (GxE) interactions, including the use of environmental covariates (ECs), improve predictive ability? We found that partitioning single nucleotide polymorphisms (SNPs) based on a priori genetic features did not consistently boost predictive ability when compared to standard genomic best …
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Persistence of ranavirus in an East-Central Illinois amphibian community
… programs. Experimental studies have suggested environmental covariates such as temperature affect viral replication, host immune function, or both to exacerbate disease and induce outbreaks. However, field-based investigations have found inconclusive results concerning environmental effects on …
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Effects of canopy cover on the landscape epidemiology of an amphibian chytrid fungus
… survival of the pathogen is influenced by environmental variables. In particular, wetland temperatures should vary with forest canopy cover in heterogeneous landscapes. However, few studies have examined the relationship between Bd prevalence and canopy cover. I sampled anurans for Bd at 33 …
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Constructing a Bayesian Spatial Presence-Absence Model for Animals in the Serengeti National Park
… of a particular species in a specific area using environmental covariates. Additionally, we utilized centered spatially dependent terms; a term accounting for species dependence from neighboring sites, and a term accounting for cross-species dependence from neighboring sites. Our model also …
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Effects of enhanced winter nutrition and climatic variation on population performance of a large herbivore
… the effects of enhanced winter nutrition and environmental factors on survival of adult female and neonatal mule deer (Odocoileus hemionus) and associated effects on the population growth rate (λ). We modelled effects of individual and environmental covariates on survival of adult female mule …
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Spatial Ecology and Movement Patterns of Black Drum (Pogonias cromis) and Sheepshead (Archosargus probatocephalus) in Mississippi Sound
… using residency indices, network metrics, and environmental covariates, while Sheepshead maturity was inferred using size-based logistic regressions. Results indicated generally strong site fidelity, but with seasonal reductions in residency during known spawning months, consistent with partial …
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Probabilistic Ecosystems Assessment with Reinforcement Learning.
… both positive and negative weights, leverage environmental covariates collected during navigation to model biodiversity distributions. Unlike their positive-weighted counterparts, these models offer a more compact and accurate representation of complex, multimodal patterns, improving the …
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Practical Methods for Scalable Bayesian and Causal Inference with Provable Quality Guarantees
… complex relationships between a set of 𝑝 covariates and a target response, from 𝑁 observed datapoints with 𝑁 ≪ 𝑝. For example, in genomics and precision medicine, there may be thousands or millions of genetic and environmental covariates but just hundreds or thousands of observed …
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Variation In Bat Activity Across Upland Embedded Wetlands In The Cumberland Ranger District Of The Daniel Boone National Forest
… selection were used to evaluate the influence of environmental covariates on species-specific detection probability and habitat characteristics of site-occupancy for of bats 5 species groups (based on echolocation similarities). Factors influencing bat detection and occupancy varied among species …
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Environmental drivers of the abundance and distribution of forage fishes on the Northeast US shelf, with a particular emphasis on northern sand lance
… trajectories change. Chapter 3 analyzes the environmental drivers of the distribution of the six dominant, offshore forage fish species (northern sand lance, Atlantic herring, alewife, blueback herring, Atlantic mackerel, and Atlantic butterfish) on the Northeast US shelf to elucidate the …
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The relative importance of natural and human-induced environmental conditions for species richness distribution patterns in South Africa
… which of the possible anthropogenic and natural environmental factors determine spatial distribution in exotic bird species. Highlighted from these studies are that substantial positive and negative human influences on bird species richness distribution patterns are observable at the QDS …
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Factors most closely explaining activity patterns and behavior of northern saw-whet owls in migratory stopover habitat
… in the dusk, dawn, and night were impacted by environmental covariates. Owls were most active at dusk and dawn and on warmer darker nights with light winds and no precipitation earlier in the fall season. NSWO are known to be very quiet during the nonbreeding season and little is known …
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Environmental drivers of the abundance and distribution of forage fishes on the Northeast US shelf, with a particular emphasis on northern sand lance
… trajectories change. Chapter 3 analyzes the environmental drivers of the distribution of the six dominant, offshore forage fish species (northern sand lance, Atlantic herring, alewife, blueback herring, Atlantic mackerel, and Atlantic butterfish) on the Northeast US shelf to elucidate the …
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Martial eagles and the national power grid in South Africa: the implications of pylon-nesting for conservation management
… benefit from some aspects of development and environmental change. Clarity on the size and trajectory of such populations is essential for effective conservation management, but can be difficult to achieve. One solution is to use multivariate habitat association models to derive critical …
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The Influence of Selection Silviculture Biomass Harvesting on Soil Carbon, Nutrients, and Respiration in a Northern Mixed-Deciduous Forest
… of pre/post-harvest forest structure and environmental covariates, future studies that representatively sample these different areas may improve our ability to predict system responses to disturbances.
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Scientific Acoustic Data from Commercial Fishing Vessels: Eastern Bering Sea Walleye Pollock (Theragra chalcogramma)
… additive model for predicting effects of environmental covariates on winter pollock distribution. Sea surface temperature and bottom depth were found to be significant predictors of pollock density.
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Investigating factors influencing blue-winged teal movements and habitat selection during the nonbreeding season
… migrations based on a range of favorable environmental factors that minimize energy expenditure, risk of mortality, and maintain or improve body condition, most studies have investigated these relationships at the population level using abundance and occupancy metrics. In this study, we …
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Crop Yields Response To Conservation Farming And Spatial-Temporal Effects In Zambia
We examined crop yields along a wide environmental gradient and spatial dynamics in soil organic matter in response to conservation farming (CF) in Zambia. Maize yields from farmer managed CF and traditional farming (TF) were not significantly different with over 280 on-farm trials with varying …
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Evaluation of spatial prediction methods for selected soil properties to support land suitability mapping for rice in Zambia.
… variable were available along with additional environmental covariates as predictor variables. The options were to undertake spatial prediction by geostatistical or machine learning methods. Also addressed was how to robustly validate models from legacy data when these have, as is often the …
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