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Browsing by Author "Erni, Birgit"

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Analysis of distribution maps from bird atlas data: dissimilarities between species, continuity within ranges and smoothing of distribution maps

Author: Erni, Birgit Date: 1998 A dissimilarity coefficient for estimating the dissimilarity between two bird atlas distributions is developed. This coefficient is based on the Euclidean distance concept. The atlas distributions are compared over all quarter degree grid ... Read more
Bayesian analysis of historical functional linear models with application to air pollution forecasting

Author: Junglee, Yovna Date: 2022 Historical functional linear models are used to analyse the relationship between a functional response and a functional predictor whereby only the past of the predictor process can affect the current outcome. In this work, we develop a Bayesian ... Read more
Changes in rainfall seasonality in the Western Cape, South Africa: an exploration of methods for determining the start and end of the rainfall season

Author: Ivey, Peter Date: 2020 The aim of this thesis is to detect and analyse changes in seasonality in rainfall for various groups of weather stations in the Western Cape area. Weather stations with similar seasonal patterns are firstly grouped together using certain ... Read more
Citizen science reveals complex changes in barn swallow phenology in South Africa over three decades

Author: Burman, Marc Sebastian Date: 2016 Palearctic migrants, including barn swallows Hirundo rustica, responded to climate change in Europe from the mid to late 1900s with phenological changes, mostly showing earlier arrival and start of breeding. During this period, barn swallows ... Read more
A continuous-time formulation for spatial capture-recapture models

Author: Distiller, Greg Date: 2016 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 ... Read more
The ecology of Namibian fairy circles and the potential role of sand termites (Psammotermes allocerus Silvestri) in their origin

Author: Vlieghe, Kelly E P Date: 2016 Regularly-dispersed patterning in the landscape occurs globally, both in the form of vegetated patches or gaps of bare earth within a vegetated matrix. Most theories link these periodic patterns to various biotic factors including selective ... Read more
Modelling growth patterns of bird species using non-linear mixed effects models

Author: Ntirampeba, D Date: 2008 The analysis of growth data is important as it allows us to assess how fast things grow and determine various factors that have impact on their growth. In the current study, growth measurements on body features (body mass, wing length, head ... Read more
Regional CO₂ flux estimates for South Africa through inverse modelling

Author: Nickless, Alecia Date: 2018 Bayesian inverse modelling provides a top-down technique of verifying emissions and uptake of carbon dioxide (CO₂) from both natural and anthropogenic sources. It relies on accurate measurements of CO₂ concentrations at appropriately placed ... Read more
Structural time series modelling for 18 years of Kapenta fishing in Lake Kariba

Author: Dalmeyer, Lara Date: 2012 Includes abstract. Includes bibliographical references. Read more
Using movement modelling to improve the design and analysis of vantage point surveys in bird and wind energy studies

Author: Cervantes Peralta, Francisco Date: 2020 Wind energy, although mostly a clean and increasingly efficient energy source, is known to affect communities of flying vertebrates. Mortality by collision with turbines is one of the main impacts on birds and bats associated with wind energy. ... Read more
Using state-space time series analysis on wetland bird species to formulate effective bioindicators in the Barberspan wetland

Author: Edwards, Gareth Date: 2022 The Coordinated Waterbird Count dataset (CWAC) is a dataset containing waterbird counts from wetlands across South Africa, going as far back as 1970. These data contain valuable information on population sizes and their trends over time. This ... Read more