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Showing 1 to 20 of 41 for “"occupancy models"”.
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Efficient Bayesian analysis of spatial occupancy models
… play an important role in ecological studies. Occupancy models have been a useful tool for ecologists to make inference about species distribution and occurrence. Bayesian methodology is a popular framework used to model the relationship between species and environmental variables. In this …
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Fast and efficient approaches to large-scale occupancy models
Bayesian occupancy models are important statistical tools that are used to investigate species range dynamics, species interactions as well as undercover key biological processes that drive occupancy (and detection) in a particular region. The results from these models are used to answer pressing …
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Using Occupancy Models to Predict Grassland Bird Distributions in Southeastern Alberta
… efforts. I used single-species, single-season occupancy models to (1) identify landscape factors influencing the distribution of grassland bird species, (2) generate predictions of species distributions in southeastern Alberta, and (3) evaluate the predictive performance of each species model …
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Bird's response to seasonality: investigating the range dynamics of birds through dynamic occupancy models
… strategies. In this study, I used dynamic occupancy models on the South African Bird Atlas Project 2 (SABAP 2) data to investigate the seasonal range dynamics of a selection of five migratory and six nomadic bird species in western South Africa. In the context of this study, seasonal range …
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Assessing colonization and extirpation trends of Illinois understory herbaceous plants using robust-design occupancy models
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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Using Bayesian Hierarchical Models to Study the Spatial and Temporal Distribution of Mammals in Serengeti National Park
… species were observed during the year 2012. Occupancy models are used to analyze this type of data, but they require discretization of time. Thus, we have to choose the width of time intervals to be analyzed. The goal of this research is to develop methodology to compare results based on …
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Assessing the impacts of white-nose syndrome induced mortality on the monitoring of a bat community at Fort Drum Military Installation
… Habitat analysis of radio telemetry data and occupancy models of acoustic data were congruent in confirming nocturnal spatial use of forested riparian zones by little brown bats. Additionally, occupancy models of passive versus active sampling revealed that passive acoustic sampling is …
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Bat occupancy of forests and managed savanna and woodland in the Missouri Ozark Region
… of detection (p), and 2) determine how site occupancy (Ψ) varies among savannas, woodlands, and forests as a function of vegetation structure and management history for 5 common bat species in the Missouri Ozark region: big brown bat (Eptesicus fuscus), eastern red bat (Lasiurus borealis), …
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Occupancy and Abundance of Golden-cheeked Warblers (Dendroica chrysoparia) on the Balcones Canyonlands Preserve
… Count data were analyzed using both multi-season occupancy models and binomial mixture models (BMM) to estimate each observer's probability of detection at both the species and individual level. Model selection revealed that observer had a strong influence on detection of GCW A. I found …
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Wild carnivore habitat use and community ecology in a biodiversity hotspot and human-wildlife conflict with pumas and dogs across Chile
… mega-wildfire in 2017. I used dynamic occupancy modeling of human-wildlife conflict (HWC) across 52 provinces for 8 years in Chile and found that free-ranging dogs outpace pumas in livestock depredation, killing substantially more livestock than pumas. Occupancy models show that HWC …
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Integrating multiple sign types to improve occupancy estimation for inconspicuous species: a case study of American pika in the Pacific Northwest
… critical for conservation and management. Occupancy models have emerged as one of the most powerful tools to investigate regional population trends and dynamics, range shifts and habitat associations. Standard occupancy models are capable of producing unbiased estimates of occupancy and its …
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Evaluating occupancy and the range dynamics of invasive bird species in South Africa
… charged with protecting indigenous wildlife. The occupancy and population range dynamics of the Myna and Mallard species are individually investigated in the South African region by fitting static and dynamic occupancy models to a set of citizen science data for a 10-year study period between …
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Occupancy and Detection Rates of Salamanders in Association with Altered Water Regimes at Mingo National Wildlife Refuge in Southeastern Missouri
… and invertebrates at each site. I then generated models that would estimate site occupancy and detection rates for three common salamander species. For both Siren and Notophthalmus, occupancy and detection rates were higher at artificial wetlands than at more ephemeral woodland pools. Best fit …
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A DYNAMIC LANDSCAPE OF FEAR: HUMAN IMPACTS ON CARNIVORE COMMUNITIES
… activity density curves, applied multispecies occupancy models, and calculated attraction-avoidance ratios to describe relationships among members of the carnivore guild relative to various types of human activity. My results suggested the bobcat can function as a dominant carnivore dependent …
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The influence of habitat features and co-occurring species on puma (Puma concolor) occupancy across eight sites in Belize, Central America
… I used single- and multi-season, single-species occupancy models and two-species co-occurrence models to analyze camera trapping and habitat data collected at eight study sites across Belize. Puma occupancy was positively influenced by jaguar trap success, understory density, canopy cover, and …
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Evaluating the use of acoustic monitoring for surveying tropical birds
… in all habitats. Similarly, the multi-method occupancy models demonstrated that SRS yielded detection probabilities similar to or greater than those of point counts for nearly all species across all habitats, although a few important exceptions occur for species in which SRS performed better …
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AVIAN COMMUNITIES MONITORED ALONG A SUCCESSIONAL CHRONOSEQUENCE IN BOTTOMLAND HARDWOOD FORESTS IN THE LOWER MISSISSIPPI ALLUVIAL VALLEY
… treatment. Additionally, single-species occupancy models were developed for these four species of concern: northern parula (<em>Setophaga americana</em>), prothonotary warbler (<em>Protonotaria citrea</em>), wood thrush (<em>Hylocichla mustelina</em>), and Acadian flycatcher …
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An assessment of factors influencing territory size and the use of hunter surveys for monitoring wolves in Montana
… lupus). I evaluated whether a multi-season patch occupancy model (POM) could be used to accurately estimate the abundance and distribution of wolf packs in Montana from 2007 to 2009. I evaluated hunter sightings of wolves as an index of occupancy and assessed model accuracy by comparing POM …
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An assessment of factors influencing territory size and the use of hunter surveys for monitoring wolves in Montana
… lupus). I evaluated whether a multi-season patch occupancy model (POM) could be used to accurately estimate the abundance and distribution of wolf packs in Montana from 2007 to 2009. I evaluated hunter sightings of wolves as an index of occupancy and assessed model accuracy by comparing POM …
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Occupancy of Stream-Associated Amphibians within the Interstate 90 Snoqualmie Pass Corridor
… due to their cryptic nature; however, occupancy models were developed to deal with these detectability problems and provide estimates of occupancy that can also be related to site characteristics. Highway crossing risks and habitat isolation were mitigated for in recent construction of …
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