Sökning: "small population size"
Visar resultat 1 - 5 av 160 avhandlingar innehållade orden small population size.
- Detta är en avhandling från Umeå : Institutionen för ekologi, miljö och geovetenskap. Umeå universitet
Sammanfattning : Most animals grow substantially during their lifetime and change in competitive ability, predatory capacity and their susceptibility to predation as they grow. This thesis addresses the implications of this on regulation and dynamics within populations as well as between population interactions. LÄS MER
- Detta är en avhandling från Stockholm : Department of Physical Geography, Stockholm University
Sammanfattning : The world-wide intensification of agriculture has led to a decline in species richness due to land use change, isolation, and fragmentation of natural and semi-natural habitats in agricultural and forestry landscapes. As a consequence, there is a current landscape management focus on the importance of green infrastructure to mitigate biodiversity decline and preserve ecosystem functions e. LÄS MER
- Detta är en avhandling från Stockholm : Botaniska institutionen
Sammanfattning : Population viability analysis (PVA) is commonly used in conservation biology to predict population viability in terms of population growth rate and risk of extinction. However, large data requirements limit the use of PVA for many rare and threatened species. LÄS MER
4. Population divergence at small spatial scales – theoretical and empirical investigations in perchDetta är en avhandling från Uppsala : Acta Universitatis Upsaliensis
Sammanfattning : Genetically structured populations arise when gene flow between groups of individuals is hindered by geographical, behavioural or temporal barriers. The identification of such groups is important for understanding evolution and has large implications for conservation concern. LÄS MER
- Detta är en avhandling från Stockholm : Department of Zoology, Stockholm University
Sammanfattning : Species worldwide are subject to contractions in both abundance and geographical range, and their persistence in a changing environment may thus depend on the ability to survive in small and fragmented populations. Despite the urgent need to understand how extinction works, our knowledge of pre-extinction genetic processes is limited because techniques allowing population and conservation genomics to be studied in wild threatened populations have become available only recently. LÄS MER