Sökning: "Individual-based model"

Visar resultat 1 - 5 av 17 avhandlingar innehållade orden Individual-based model.

1. 1. Modelling animal populations

   Författare :Åke Brännström; Umeå universitet; []
   Nyckelord :population model; stochastic population model; population dynamics; discrete time model; Beverton-Holt model; Skellam model; Hassell model; Ricker model; first principles; coupled map lattice; CML; area integral; square function; Mathematics; matematik;

   Sammanfattning : This thesis consists of four papers, three papers about modelling animal populations and one paper about an area integral estimate for solutions of partial differential equations on non-smooth domains. The papers are: I. Å. Brännström, Single species population models from first principles. LÄS MER

3. 2. Optimal thinning : a theoretical investigation on individual-tree level

   Författare :Peter Fransson; Åke Brännström; Ola Lindroos; Oskar Franklin; Per Lundberg; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Forest management; Simulation; Optimization; Spatially explicit model; Individual-based model;

   Sammanfattning : Paper I: In paper I, we asked how a tree should optimally allocate its resources to maximize its fitness. We let a subject tree grow in an environment shaded by nearby competing trees. The competitors were assumed to have reached maturity and had stopped growing, thus creating a static light environment for the subject tree to grow in. LÄS MER

4. 3. Evolutionary consequences of ecological interactions

   Författare :Etsuko Nonaka; Åke Brännström; Göran Englund; Richard Svanbäck; Per Lundberg; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; adaptive dynamics; eco-evolutionary dynamics; ecological speciation; ecosystem; individual based; population dynamics; phenotypic plasticity; predator-prey; sexual selection;

   Sammanfattning : Eco-evolutionary dynamics integrates the reciprocal interactions betweenecology and evolution. These two branches of biology traditionally assumethe other as static for simplicity. However, increasing evidence shows thatthis simplification may not always hold because ecology and evolution canoperate in similar timescales. LÄS MER

5. 4. The Art of Modelling Oscillations and Feedback across Biological Scales

   Författare :Linnéa Gyllingberg; David J. T. Sumpter; Helen Byrne; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mathematical biology; mathematical modelling; oscillations; feedback mechanisms; dynamical systems; individual-based models; complex systems; Tillämpad matematik och statistik; Applied Mathematics and Statistics;

   Sammanfattning : This thesis consists of four papers in the field of mathematical biology. All papers aim to advance our understanding of biological systems through the development and application of innovative mathematical models. LÄS MER

7. 5. The role of biogeophysical feedbacks and their impacts in the arctic and boreal climate system

   Författare :Wenxin Zhang; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arctic and boreal vegetation change; Biogeophysical feedbacks; Albedo; Latent heat; Carbon budget; Representative concentration pathways; Eearth system model; LPJ-GUESS; RCA; Sea ice;

   Sammanfattning : The physical environment in the northern high latitudes including the Arctic cryosphere has undergone dramatic changes due to anthropogenic greenhouse gas warming, which since pre-industrial times has been twice or more the rate of global mean warming. Global climate models predict that this accelerated warming will continue for at least the next few decades. LÄS MER