Search for dissertations about: "Johannes Bergsten"

Found 4 swedish dissertations containing the words Johannes Bergsten.

  2. 1. 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

  4. 2. Evolution of the Biodiversity Hotspot of Madagascar from the Eye of Diving Beetles : Phylogeny, colonization and speciation

    Author : Rasa Bukontaite; Johannes Bergsten; Ingi Agnarsson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dytiscidae; diving beetles; Biogeography; Phylogeny; Dating; phylogenetic informativeness; colonization; speciation; microendemism; Madagascar; systematisk zoologi; Systematic Zoology;

    Abstract : Dytiscidae, contains numerous endemic and non-endemic species on Madagascar. Their evolutionary history is largely unknown on the island. Herein, I use analyses to infer phylogenetic relationship among groups of diving beetles, with a focus on the subfamily Dytiscinae and endemic species in two other groups of Dytiscidae. READ MORE

  5. 3. Hidden Creatures – systematics of the Euphorinae (Hymenoptera)

    Author : Julia Stigenberg; Fredrik Ronquist; Johannes Bergsten; Andrew Austin; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Parasitic wasps; Braconidae; Euphorinae; systematics; phylogeny; molecular taxonomy; cryptic species; evolution; host preferences; identification keys; Systematic Zoology; zoologisk systematik och evolutionsforskning;

    Abstract : Parasitic wasps constitute one of the last remaining frontiers in the charting of animal diversity. The Braconidae is the second most species-rich family of parasitic wasps; the world fauna has been estimated at 40 000 species and the Swedish fauna is believed to include a little more than 2 000 species, 1 200 of which are currently documented. READ MORE

  6. 4. Phylogeny, taxonomy and species delimitation of water mites and velvet mites

    Author : Jeanette Stålstedt; Johannes Bergsten; Fredrik Ronquist; Joanna Mąkol; Ashley Dowling; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Acariformes; Parasitengona; Hydrachnidia; Trombidia; water mites; velvet mites; taxonomy; cryptic species; species delimitation; DNA; GMYC; experimental rearing; new synonyms; distribution; phylogeny; revised classification; Systematic Zoology; zoologisk systematik och evolutionsforskning;

    Abstract : This study is part of the Swedish Taxonomy Initiative (STI) - one of the most ambitious all taxa biodiversity inventories in the world. One of the pillars in STI is to support taxonomic research on the most neglected taxonomic groups with the aim to lift the level of knowledge of biodiversity in the country. READ MORE