Search for dissertations about: "tvåvingar"

Found 4 swedish dissertations containing the word tvåvingar.

  2. 1. Ultrastructural and systematic studies of cecidomyiidae (Diptera)

    Author : Ruben Tastás-Duque; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Gallmyggor; tvåvingar; cecidomyiidae; diptera;

    Abstract : Examination of the abdomen of the adult female and the head capsule of the mature larva indicates the grat utility of the Scanning Electron Microscope (SEM) in examining structures when searching for useful characters to deal with the taxonomy and phylogeny of gall midges (Diptera: Cecidomyiidae). Some of the structures found represent adaptations of limited value for phylogenetic considerations at higher levels. READ MORE

  4. 2. Parasites, reproductive success and health status in birds

    Author : Reija Dufva; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Tättingar; Passeriformes; Reproduktion; Tvåvingar; Diptera; Loppor; Siphonaptera; Synekologi;

    Abstract : .... READ MORE

  5. 3. Indirect effects of river regulation : consequences for landbirds of reduced numbers of aquatic insects

    Author : Darius Strasevicius; Björn Malmqvist; Tapio Eeva; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Boreal region; Simuliidae; Leucocytozoon; pied flycatcher; aquatic insects; breeding success; blood parasites; bird communities; river regulation; impoundment; Biology; Biologi;

    Abstract : Abstrakt: Jag har undersökt hur älvreglering påverkar mängden knott (Tvåvingar: Simuliidae) längs flera norrlandsälvar och vilka konsekvenser denna påverkan får för den landlevande fågelfaunan. Studien visar att utbyggnad av älvar har en negativ effekt på mängden knott. READ MORE

  6. 4. Population biology and conservation of beetles and pseudoscorpions associated with hollow oaks

    Author : Thomas Ranius; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Systematic zoology; wood mould; tree hollow; pseudoscorpion; population variability; Osmoderma eremita; metapopulation; mark-recapture; habitat fragmentation; genetic structure; dispersal; beetle; computer simulation; taxonomy; zoogeography; Zoologisk systematik; djurgeografi;

    Abstract : Many species associated with old trees are threatened, as this habitat has decreased severely in Europe during the last 200 years. In old oaks, hollows with wood mould often form in the trunks and these harbour a specialized fauna mainly consisting of beetles, flies and pseudoscorpions. READ MORE