Search for dissertations about: "MORPHS"

Showing result 6 - 10 of 22 swedish dissertations containing the word MORPHS.

  2. 6. The taxonomy of the genera Dirina and Roccellina (Roccellaceae)

    Author : Anders Tehler; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Dirina and Roccellina are two lichen genera in the Roccellaceae. Both are herein monographed world wide. Thirty species, two subspecies, and six forms are recognized. The study includes detailed information on taxonomy, nomenclature, history, morphology, anatomy, chemistry, distribution and habitat. READ MORE

  4. 7. Speciation genomics : A perspective from vertebrate systems

    Author : Nagarjun Vijay; Jochen. B.W Wolf; C. Alex Buerkle; Uppsala universitet; []
    Keywords : evolution; speciation; genomics; vertebrate; adaptation; selection; linked selection; crow; killer whale; hybrid zone; transcriptomics; population genetics; behaviour; colouration; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

    Abstract : Species are vital entities in biology. Species are generally considered to be discrete entities, consisting of a group of (usually interbreeding) individuals that are similar in phenotype and genetic composition, yet differ in significant ways from other species. READ MORE

  5. 8. Evolution in changing environments revealed by fire melanism in pygmy grasshopper

    Author : Magnus Karlsson; Anders Forsman; Karl Gotthard; Linnéuniversitetet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Evolution Melanism Polymorphism Pygmy grasshoppers; Biology; Biologi; Evolutionary Biology; Evolutionsbiologi;

    Abstract : According to theory, genetic diversity can be maintained by environmental variation and the degree of genetic and phenotypic polymorphism may enhance the ability of populations to endure stress imposed by changing environments. In my thesis I used colour polymorphic pygmy grasshoppers (Tetrix subulata) as a model system to explore how environmental variation influenced genetic diversity. READ MORE

  6. 9. Taxonomy, phylogeny, and secondary sexual character evolution of diving beetles, focusing on the genus Acilius

    Author : Johannes Bergsten; Anders N. Nilsson; Jyrki Muona; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; antagonistic coevolution; arms race; sexual conflict; diving beetle; Dytiscidae; Coleoptera; taxon sampling; long-branch attraction; parsimony; Bayesian analysis; taxonomic revision; Biologi; Biology; Biologi;

    Abstract : Sexual conflict can lead to antagonistic coevolution between the sexes, but empirical examples are few. In this thesis secondary sexual characters in diving beetles are interpreted in the light of sexual conflict theory. READ MORE

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

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

    Abstract : 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. READ MORE