Sökning: "distribution of fitness effects"

Hittade 5 uppsatser innehållade orden distribution of fitness effects.

1. 1. Demography of Birch Populations across Scandinavia

   Master-uppsats, Uppsala universitet/Växtekologi och evolution; Uppsala universitet/Institutionen för biologisk grundutbildning

   Författare :Janek Sendrowski; [2022]
   Nyckelord :birch; betula; pubescens; pendula; betula pubescens; betula pendula; silver birch; downy birch; demography; population structure; distribution of fitness effects; DFE; dadi; UMAP; PCA; ADMIXTURE; polyDFE; ice age; glaciation; tree; boreal forest; climate change; adaption; tetraploid; diploid-tetraploid introgression; Scandinavia; genetic cluster; pipeline; snakemake; bioinformatics; reproducible; population genetics; postglacial population expansion; demographic history; FEEMS; site-frequency spectrum; SFS; last glacial maximum; LGM; workflow; python; population expansion; population growth; EST-SFS; 0-fold degenerate; 4-fold degenerate; maximum likelihood estimation; MLE; variant call format; VCF; single-nucleotide polymorphism; SNP;

   Sammanfattning : Boreal forests are particularly vulnerable to climate change, experiencing a much more drastic increase in temperatures and having a limited amount of more northern refugia. The trees making up these vast and important ecosystems already had to adapt previously to environmental pressures brought about by the repeated glaciations during past ice ages. LÄS MER

3. 2. Impact of environmental variables on tundra vegetation onset of flowering explained by survival modelling

   Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Författare :Hanna Jonsson; [2019]
   Nyckelord :Flowering; Phenology; Cox proportional hazard model; Tundra; International tundra experiment; Climate change; Physical Geography and Ecosystem analysis; Earth and Environmental Sciences;

   Sammanfattning : Timing of phenological events are highly related to climate and is one of the first signs of ecosystem responses to the climate change. Timing of flowering phenology is an important trait influencing the distribution and fitness of plants species. LÄS MER

4. 3. Linking the dynamics of genetic algorithms to the encoding of information

   Kandidat-uppsats, Lunds universitet/Beräkningsbiologi och biologisk fysik - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

   Författare :Henrik Åhl; [2016]
   Nyckelord :Genetic algorithms; evolution; dynamics; encoding; encoding of information; genetic; string; binary; gray code; consensus; algorithm; optimisation; genotype; phenotype; genome; evolutionary algorithms; fitness; search space; Physics and Astronomy;

   Sammanfattning : Genetic algorithms are complex constructs often used as heuristic search methods in contexts ranging from combinatorial optimisation to in silico evolution. They draw inspiration from the principles of biological evolution by utilizing the concepts of mutation, reproduction and selection in order to improve a population of solutions. LÄS MER

5. 4. Despotic distribution in female fallow deer (Dama dama) groups

   Magister-uppsats, SLU/Dept. of Ecology

   Författare :Madeleine Christensson; [2010]
   Nyckelord :Fallow deer ; Group living; Rank; Dominance; Home range size; Habitat preferrens ;

   Sammanfattning : In a fallow deer population in south western Sweden was female group size and group composition estimated. A possible rank order between female groups and the effects of this was also investigated. LÄS MER

7. 5. Genetisk studie av inavel och fertilitet hos hund

   L3-uppsats, SLU/Dept. of Animal Breeding and Genetics

   Författare :Henrik Johansson; [2005]
   Nyckelord :fruktsamhet; inavel; inavelsdepression; hund;

   Sammanfattning : Inbreeding, the mating of related individuals, has been the one dominating breeding strategy for dog breeders during the last 200 years. However, its negative effects on fer-tility and other fitness traits, a phenomenon called inbreeding depression, have been ignored in the quest of perfect unity in conformation or performance. LÄS MER