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Showing 1 to 20 of 66 for “"Capture-recapture"”.
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Bias in Closed Population Capture-Recapture
… estimators: M0 (all individuals have the same capture probability on all occasions), Mb (behavior is affected by prior capture) and Mt (all individuals have the same capture probability that varies by occasion). After examining the initial results and observing substantial negative bias …
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Spatial capture-recapture for acoustic surveys
Spatial capture-recapture (SCR) is one method to estimate the animal density of a wildlife population, where animal density describes the number of animals per unit area within the survey region. Since SCR’s inception, it has seen increasing use in estimating animal density from data collected by …
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Leveraging Partial Identity Information in Spatial Capture-Recapture Studies with Applications to Remote Camera and Genetic Capture-Recapture Surveys
… while accounting for imperfect detection using capture-recapture models. Reliable estimates of these parameters are vital information required for making sound conservation decisions; however to date, noninvasive sampling methods have been of limited use for a vast number of species which are …
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A continuous-time formulation for spatial capture-recapture models
Spatial capture-recapture (SCR) models are relatively new but have become the standard approach used to estimate animal density from capture-recapture data. It has in the past been impractical to obtain sufficient data for analysis on species that are very difficult to capture such as elusive …
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Confidence Intervals for Population Size in a Capture-Recapture Problem.
<p>In a single capture-recapture problem, two new Wilson methods for interval estimation of population size are derived. Classical Chapman interval, Wilson and Wilson-cc intervals are examined and compared in terms of their expected interval width and exact coverage properties in two models. The …
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Evaluation of capture-recapture estimators using a cyclic snowshoe hare population
Many theoretical capture-recapture estimation models have been introduced into applied field ecology in the last twenty years, but only a few of these models have been tested in field situations. The objective of this thesis was to evaluate capture-recapture estimators when applied to a cyclic …
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Calling ecology of micro frogs (Microbatrachella capensis): a case study using acoustic spatial capture recapture
… on the Cape Flats. I used acoustic spatial capture recapture to calculate call density and identify the main factors that determine periods of maximum frog calls. Increased calling behaviour was found early in the season and in response to rainfall. In addition, micro frogs were found to …
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The application of spatial capture-recapture models to investigate leopard ecology and conservation in South Africa
… of density. I then fit multisession spatial capture-recapture models to time series data from seven of these leopard populations to assess their threat level based on the estimated probability of population declines. I found some evidence of decline in six of the seven populations and found …
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Estimating spotted hyaena (Crocuta crocuta) population density using camera trap data in a spatially-explicit capture-recapture framework
… can be individually identified, a photographic capture-recapture framework can be used to provide density estimates. Spatially-explicit capture-recapture (SECR) models have recently been developed, and are currently considered the most robust method for analysing capture-recapture data. Camera …
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From big spots to little spots: Influence of camera trap deployment on spatial capture-recapture estimates of servals (Leptailurus serval) in Ithala Game Reserve
… estimates of cryptic carnivores. Spatial capture-recapture models are the most robust means of estimating the densities of individually identifiable species like servals. In this study, I investigate whether the ongoing leopard (Panthera pardus) surveys in Ithala Game Reserve can be used …
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Estimation of population totals from imperfect census, survey and administrative records
… and an Administrative Records List is based on capture-recapture methodology which has traditionally been employed for the measurement of abundance of biological populations. Under this framework, in order to estimate the unknown population total, N, an initial set of individuals is captured. …
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Capturing transients: an application of biostatistics to astronomy
Capture-recapture has been identified as a possible use case for estimating the underlying size of astrophysical transient populations. In this work, we present a series of exploratory analyses using capture-recapture methods from biostatistics. In the first of three separate analyses, we reproduce …
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Μοντέλα σύλληψης-επανασύλληψης για την εκτίμηση του μεγέθους δύσκολα προσεγγίσιμων πληθυσμών
… την εφαρμογή κλασικών και Μπεϋζιανών μεθόδων capture–recapture για την εκτίμηση του μεγέθους του πληθυσμού των ΧΕΝ. Μέθοδοι: Εφαρμόστηκε η κλασική μέθοδος σύλληψης–επανασύλληψης σε δεδομένα 5 πηγών για την περίοδο 2020–2021, με χρήση λογαριθμογραμμικών μοντέλων και ενσωμάτωση αλληλεπιδράσεων …
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Passive Acoustics: A Multifaceted Tool for Marine Mammal Conservation
… The animal-based methods were traditional capture-recapture, spatially explicit capture-recapture (SECR), and an approach that blends the “snapshot” method and mark-recapture distance sampling, referred to here as (SMRDS). The cue-based methods were conventional distance sampling (CDS), an …
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Enumerating and estimating maternal and neonatal deaths in the Western Cape Province, South Africa
… involved the applications of three-source capture-recapture methods, to estimate maternal and neonatal mortality under-reporting in the Western Cape province. Based on these models, maternal and neonatal mortality under-reporting were estimated at 45.6% and 17.7% over the full 4-year period …
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Ecology and growth of Tamias palmeri and testing of a protocol to monitor habitat relationships
… abundance of Tamias palmeri estimated with live capture-recapture was positively correlated with shrub cover and negatively correlated with slope. Timing of emergence from dens by juveniles was earlier and weights of juveniles were greater in ravine areas as compared to upslope areas. Track …
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Multiple-Species Models for True Abundances Allowing for Heterogeneity of Capture Between and Within Species
… community, the probabilities for observance (capture) of individual animals often differ both within and between species. Previous research involving multiple species' abundances have largely ignored this fact. In this paper, we explore the use of finite mixture modeling to quantify species' …
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Population size estimation from mark-resighting surveys
… design is similar to the commonly used multiple capture-recapture design, yet in some cases economically more feasible and easy to use. Sampling is done by first tagging a number of randomly selected animals with visible markers and later randomly sighting them (for instance, for large animals by …
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A study of the river redhorse, Moxostoma carinatum (Pisces; Catostomidae), in the tributaries of the Ottawa River, near Canada's National Capital and in a tributary of Lake Ontario, the Grand River, near Cayuga, Ontario.
… the Mississippi River, post-spawn specimens were captured on a variety of substrates in deeper waters. Both opercular bones and scales (n = 19) recorded accurate age until age XII after which only the opercular bone provided clear annuli. Growth for both sexes was defined by the following …
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