Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 92-99). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 92-99). Also available on the Internet.

No description available.

Conservation biology is primarily concerned with the amelioration of species decline. The Yellow-footed Rock-wallaby (Petrogale xanthopus xanthopus) is a medium-sized Macropod that inhabits the semiarid rangelands of South Australia and New South Wales. Its conservation status is Vulnerable C2a(i). In this study, population modelling, spatially explicit habitat modelling and Population Viability Analysis (PVA) have been used to better understand the factors that affect the abundance and distribution of the P. x. xanthopus in South Australia. The processes that drive the population dynamics of a species operate at different scales. As such this research involves a collection of several inter-related and scale-specific empirical studies that provide insights about the population dynamics of P. x. xanthopus. Each of these studies captures environmental, demographic and behavioural process acting on the population at different scales. These include the analysis of relative abundance data derived from an aerial census, mark recapture sampling of demographic parameters in relation to rainfall patterns and a collection of habitat models derived at different scales using presence-absence data. Spatially explicit PVAs enable the population dynamics of a species to be modelled in space and time. Using these data, a PVA is conducted to explore and rank the importance of the factors that threaten this species and help guide their future monitoring and management. Movement is also a key issue when considering problems such as isolation and inbreeding. Given that little is known about the dispersal behaviour of this species, a range of different dispersal behaviours are also simulated in the PVA using random and non-random mating algorithms, to estimate the potential for inbreeding. / thesis (PhD)--University of South Australia, 2004.

Thesis (Ph.D. (Zoology & Entomology)) - Rhodes University, 2008.

Thesis (Ph. D.)--University of Missouri-Columbia, 2002. / Typescript. Vita. Includes bibliographical references (leaves 88-92). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 2002. / Typescript. Vita. Includes bibliographical references (leaves 88-92). Also available on the Internet.

Thesis (doctoral)--Humboldt-Universität zu Berlin, 1999. / Includes bibliographical references (p. 243-257).

Thesis (M.Phil.) - University of St Andrews, April 2008.

Fundação Boticário; CAPES / O presente estudo teve como objetivo avaliar a ecologia populacional de Hydrochoerus hydrochaeris (Linnaeus, 1766) em duas áreas urbanas no norte do Paraná, uma aberta e outra protegida, avaliando os efeitos desses dois diferentes tipos de ambientes sobre a estrutura e dinâmica da população e suas implicações para conservação da espécie. Os monitoramentos das populações foram realizados mensalmente no período entre junho de 2014 e março de 2015 no Parque Lago Jaboti (Apucarana/PR) e na Unidade de Conservação Parque Arthur Thomas (Londrina/PR). Para realização do levantamento de dados populacionais foi empregada a metodologia de censos totais (contagem direta de indivíduos). Foram avaliados parâmetros ecológicos das populações de capivaras, tais como, densidade ecológica, abundância, distribuição etária e taxa de natalidade, assim como, realizada a análise da paisagem. Foi aplicada a Análise de Variância (ANOVA), para testar as diferenças entre as médias da abundância de cada faixa etária por ano de observação, bem como as diferenças entre as médias da densidade ecológica ao longo dos anos de observação. O padrão de relação entre as classes de uso e ocupação do solo na paisagem e os parâmetros ecológicos das populações de capivaras foi avaliado pela Análise de Componentes Principais (ACP). A tendência de variação das abundâncias médias ao longo do tempo para o Parque Arthur Thomas revelou queda abrupta da população em curto período de tempo (2014 16±9, 14 e 2015 7±1), assim como a densidade ecológica em 2015 (0,05 ind./ha). Por outro lado, o Parque Lago Jaboti, apresentou aumento da abundância absoluta, com recuperação marcante da população no mesmo período (2014 38±8,30 e 2015 45±1,73) e chegando com uma densidade ecológica em 2015 de (2 ind./ha). A taxa de natalidade encontrada para o Parque Lago Jaboti foi superior à do Parque Arthur Thomas, que apresentou taxa negativa entre 2012 e 2015. A análise do uso e ocupação do solo demonstrou diferenças expressivas do ponto de vista da contribuição relativa dos elementos da paisagem na heterogeneidade espacial. O Parque Arthur Thomas apresentou áreas de vegetação densa e de zona urbana relativamente superiores àquelas verificadas no Parque Lago Jaboti que revelou proporções relativamente maiores das áreas de agricultura/campo e solo exposto. Dessa forma, o presente estudo revelou que a estrutura populacional local está diretamente relacionada às características espaciais de ambas as paisagens estudadas, como pode ser observado pela maior abundância e densidade verificada no Parque Lago Jaboti em comparação com Parque Arthur Thomas nos últimos anos de estudo. / This study aimed to evaluate the population ecology of Hydrochoerus hydrochaeris (Linnaeus, 1766) in two urban areas in the north of Paraná, an open and other protected by assessing the effects of these two different types of environments on the structure and dynamics of the population and its implications for conservation of the species. The monitoring of the populations were performed monthly between June 2014 and March 2015 in Jaboti Lake Park (Apucarana / PR) and Conservation Unit Parque Arthur Thomas (Londrina / PR). To conduct the survey population data was used the methodology of total census (direct counting of individuals).They were evaluated ecological parameters of the populations of capybaras, such as ecological density, abundance, age distribution and birth rate, as well as performed the analysis of the landscape. It was applied to analysis of variance (ANOVA) to test the differences between the averages of the abundance of each age group per year of observation, as well as the differences between the average ecological density over the years of observation. The standard relationship between the use of classes and land use in the landscape and the ecological parameters of the capybara populations was evaluated by Principal Component Analysis (PCA). The trend of variation of average abundance over time to Thomas Arthur Park revealed abrupt decrease of the population in a short period of time (2014 16 ± 9, 14 ± 1 and 2015 7±1) as well as ecological density in 2015 (0.05 ind./ha). On the other hand, the Jaboti Lake Park, showed an increase in absolute abundance, with marked recovery of the population in the same period (2014 38±8,30 and 2015 45±1,73) and coming up with an ecological density in 2015 (2 ind ./ha). The birth rate found Lake Park Jaboti was superior to Arthur Thomas Park, which had a negative rate between 2012 and 2015. The use and land cover analysis showed significant differences from the point of view of the relative contribution of landscape elements in the spatial heterogeneity. Arthur Thomas Park shows areas of dense vegetation and urban areas relatively higher than those observed in Jaboti Lake Park that revealed relatively higher proportions of the areas of agriculture / field and exposed soil. Thus, the present study revealed that the local population structure is directly related to the spatial characteristics of both studied landscapes, as can be seen by the greater abundance and density seen in Jaboti Lake Park compared to Arthur Thomas Park in recent years of study.