Essays about: "Postglacial expansion"

Found 2 essays containing the words Postglacial expansion.

  1. 1. Demography of Birch Populations across Scandinavia

    University essay from Uppsala universitet/Växtekologi och evolution; Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Janek Sendrowski; [2022]
    Keywords : 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;

    Abstract : 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. READ MORE

  3. 2. The common meadow EuropeanGrasshopper (Chorthippus parallelus)as a window to the process ofspecies formation

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Enrique Celemín Amaro; [2020]
    Keywords : Speciation genomics; Phylogeography; Species tree; Incomplete Lineage Sorting ILS ; Gene tree discordance; Postglacial expansion; Secondary contact;

    Abstract : Despite more than 50 years of research on the genetic basis of speciation, we still know very little about the early stages of this process. A general rule of speciation is the Haldane’s Rule, which states that postzygotic isolation is expressed earlier in the heterogametic sex: sterility and inviability in hybrids is much more likely to occur in the heterogametic sex. READ MORE