Search for dissertations about: "Host search"

Showing result 1 - 5 of 49 swedish dissertations containing the words Host search.

  1. 1. Ecology and evolution in a host-parasitoid system Host search, immune responses and parasitoid virulence

    University dissertation from Stockholm : Department of Ecology, Environment and Plant Sciences, Stockholm University

    Author : Lisa Fors; Stockholms universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Host-parasitoid interactions; Plant-herbivore interactions; Host search; Volatiles; Pheromones; Geographic variation; Cellular defence; Melanisation; Encapsulation; Asecodes; Galerucella; Plant Ecology; växtekologi;

    Abstract : In host-parasitoid systems, there is a continuous coevolutionary arms race where each species imposes a strong selection pressure on the other. The host needs to develop defence strategies in order to escape parasitism and the parasitoid must evolve counter-defence strategies in order to overcome the host’s immune defence and successfully reproduce. READ MORE

  2. 2. Evolutionary and mechanistic aspects of insect host plant preference

    University dissertation from Stockholm : Department of Zoology, Stockholm University

    Author : Alexander Schäpers; Stockholms universitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; host plant choice; host range; diet breadth; butterfly; oviposition; specialist; generalist; insect-plant interaction; search behavior; olfaction; decision making; evolution; parasite-host interaction; zoologisk ekologi; Animal Ecology;

    Abstract : Plant feeding insects comprise about 25% of all animal species on earth and play an important role in all ecosystems. Although we understand that their association with plants is a key-factor driving the diversification in this group, we still have large gaps in our knowledge of the underlying processes of this relationship. READ MORE

  3. 3. The importance of search behavior and movements for spatial distributions of herbivorous insects

    University dissertation from Stockholm : Department of Botany, Stockholm University

    Author : Petter Andersson; Stockholms universitet.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Olfactory search; Habitat heterogeneity; Species-traits; Immigration; Scaling relationships; Patch size; Plant-insect interactions; EAG; Odors; Pheromones; Plant Ecology; växtekologi;

    Abstract : Insect populations commonly show large spatial variation in density, and much variation have been shown to be explained by the search behavior applied by the insect when locating habitat patches. This thesis explores the importance of odor-mediated attraction for immigration rates of herbivorous insects in relation to the size of the patches and the density of host plants within the patches. READ MORE

  4. 4. Mechanistic aspects of host plant preference in butterflies

    University dissertation from Stockholm : Department of Zoology, Stockholm University

    Author : Alexander Schäpers; Stockholms universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; zoologisk ekologi; Animal Ecology; etologi; Ethology; zoologi; Zoology;

    Abstract : Searching and locating resources is essential for survival. In herbivorous insects search behavior is conducted on several scales, requiring input and integration of information from different sensory modalities. READ MORE

  5. 5. Macrophage programming and host responses to bacterial infection

    University dissertation from Stockholm : Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University

    Author : Xiao Wang; Stockholms universitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Macrophages; meningococci; mycobacteria; NhhA; CD46; cytokines; molekylärgenetik; Molecular Genetics;

    Abstract : Macrophages are dynamic, plastic, and heterogeneous immune cells that play an important role in host immune defense against bacterial infection. Various bacterial pathogens, such as Neisseria meningitidis and Mycobacterium tuberculosis, can modulate host immune responses by interfering with macrophage differentiation and polarization. READ MORE