Sökning: "Source-sink dynamics"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden Source-sink dynamics.

  1. 1. On the origin of polymorphism - consequences of competition and predation in heterogeneous environments

    Författare :Jennie Holmér; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; source-sink dynamics; predation; competition; dispersal; polymorphism; evolution; crypsis; adaptive dynamics;

    Sammanfattning : In this thesis, I have studied when an initially monomorphic population can diverge into two morphs in a heterogeneous environment. Evolution is driven by competition for resources or predation. In Paper I, we studied source-sink dynamics during evolution in an environment with two types of resource of different abundance in two habitats. LÄS MER

  3. 2. Effects of Habitat Quality on Behavioural Decisions and Population Dynamics in the Siberian Jay

    Författare :Magdalena Nystrand; Jan Ekman; Erik Matthysen; Uppsala universitet; []
    Nyckelord :Biology; Perisoreus infaustus; relatedness; delayed dispersal; predation risk; foraging; trade-off; demography; source-sink dynamics; forest structure; Biologi;

    Sammanfattning : The dynamics of natural populations may be influenced by a variety of factors, ranging from feeding interference and territoriality to the risk of predation and climatic effects. The relative influence of these factors may be contingent upon the quality of the habitat in which individuals reside. LÄS MER

  4. 3. Butterfly Diversity and Dispersal in Fragmented Grasslands

    Författare :Erik Öckinger; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Naturvetenskap; Djurekologi; Animal ecology; Ekologi; Ecology; Lepidoptera; Landscape ecology; Insects; Species richness; Fragmentation; Mobility; Natural science; Source-sink dynamics; Metapopulations;

    Sammanfattning : During the last decades, the distribution and abundance of many European species of birds, plants and insects in agricultural landscapes have declined due to agricultural intensification. To be able to mitigate these declines, it is essential to know the relative importance on local and regional ecological processes on population persistence and patterns of species richness. LÄS MER

  5. 4. Inference and management of populations in variable environments

    Författare :Niclas Jonzén; Evolutionär ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; habitat selection; environmental variability; Population dynamics; harvesting; time series analysis; model selection; Ecology; Ekologi;

    Sammanfattning : Population dynamics in space and time are manifested as changes in the distribution and abundance of organisms. To couple such patterns to the underlying processes is a central question in ecology and also key to successful management. LÄS MER

  7. 5. Dynamics of aluminum use in the global passenger car system: Challenges and solutions of recycling and material substitution

    Författare :Roja Modaresi; Norges teknisk-naturvitenskapelige universitet (NTNU); []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis analyzes the relationship between the design of vehicles, end-of-life vehicle (ELV) management, and global material production using aluminum as an example. Vehicle manufacturing, material industries and ELV management face different challenges. LÄS MER