Search for dissertations about: "midge"

Showing result 1 - 5 of 8 swedish dissertations containing the word midge.

  2. 1. Gall midge olfaction and its role in speciation

    Author : Tina Boddum; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : With the swede midge (Contarinia nasturtii) as our main model species, we study two types of olfactory cues that are of importance for gall midges: 1) the pheromones emitted by the female to attract the male; 2) and the host plant volatiles that the females use when finding a host for oviposition. We found that both the blend of compounds and the enantioisomeric form are important for male attraction in the wind tunnel and in the field. READ MORE

  4. 2. Induced responses in willow determine feeding success of a gall-forming insect

    Author : Solveig Höglund; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : In the willow Salix viminalis L. (Salicaceae), growth and defence are key responses determining feeding success of the gall midge Dasineura marginemtorquens Bremi (Diptera: Cecidomyiidae). The interaction includes induced growth (gall formation), and induced defence (hypersensitive response, HR). READ MORE

  5. 3. Plant polyploidy and interactions with insect herbivores

    Author : Leena Arvanitis; Johan Ehrlén; Christer Wiklund; John N. Thompson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; diversicifation; herbivory; host plant preference; plant galls; plant-insect interactions; plant polyploidy; selection; spatial variation; trait-fitness relationship; Terrestrial ecology; Terrestisk ekologi; Plant Ecology; växtekologi;

    Abstract : Polyploidization has been suggested to be a common mechanism for plant speciation. Polyploidy is associated with changes in plant traits and altered habitat preference. READ MORE

  6. 4. Taking a Bite out of Diversity - Taxonomy and systematics of biting midges

    Author : Jonas Strandberg; Kjell Arne Johanson; Urban Olsson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ceratopogonidae; Dasyhelea; barcoding; COI; phylogeny Sweden; Forcipomyia; Bezzia; Palpomyia; Degen1; Systematic Zoology; zoologisk systematik och evolutionsforskning;

    Abstract : The biting midges (family Ceratopogonidae) is one of the most species rich amongst the biting flies (Diptera) and has been recorded from most parts of the world. The species are mostly known for their capability to act as vectors for several important diseases, which have helped in shaping the focus to one of its genera, Culicoides Latreille, 1809. READ MORE

  7. 5. Alternative Stable States in Size-Structured Communities : Patterns, Processes, and Mechanisms

    Author : Arne Schröder; Lennart Persson; André M. de Roos; Tim Benton; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; biomass overcompensation; Chaoborus; emergent Allee effect; Heterandria formosa; juvenile recruitment bottlenecks; ontogenetic niche shifts; Poecilia reticulata; Biology; Biologi;

    Abstract : Alternative stable states have been, based on theoretical findings, predicted to be common in ecological systems. Empirical data from a number of laboratory and natural studies strongly suggest that alternative stable states also occur in real populations, communities and ecosystems. READ MORE