Search for dissertations about: "Oilseed rape"

Showing result 1 - 5 of 14 swedish dissertations containing the words Oilseed rape.

  2. 1. Ecology of parasitoids and their hosts in oilseed rape fields

    Author : Josef Berger; Biodiversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; parasitoids; herbivores; oilseed rape; pollen beetle; cabbage stem weevil; parasitoid community; niche separation; landscape scale; community composition; landscape configuration; Species abundance distribution SAD models; dispersal; metacommunity;

    Abstract : Oilseed rape fields are a very common crop in the agricultural landscape of southern Sweden, and they can harbour surprisingly many insect species. Some of them are herbivores that feed on various parts of the oilseed rape plant, others are natural enemies of the herbivores, and even more species are tourists from the surrounding landscape. READ MORE

  4. 2. Insect pollination of oilseed rape

    Author : Sandra Lindström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Ecological intensification of agriculture is suggested as a way to reach higher crop yields without increasing inputs that may degrade the environment. Increased insect pollination in crops, such as oilseed rape, Brassica napus, has been suggested to increase yields, but is rarely integrated in crop management. READ MORE

  5. 3. Characterization and Use of a Multiplex PCR-based System: Random amplified Polymorphic DNA

    Author : Christer Halldén; Malmö Klinisk kemi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; DNA mixtures; competition; graphical genotypes; bulked segregant analysis; linkage map; genetic distance; RFLP markers; RAPD markers; oilseed rape; sugar beet; Genetics; cytogenetics; Genetik; cytogenetik;

    Abstract : Random amplified polymorhic DNA (RAPD) is a PCR-based marker system that makes use of universal sets of short oligonucleotides that amplify random DNA fragments under low-stringency conditions. The RAPD marker system has found widespread use and possesses a number of very positive features, being a multiplex and universal system. READ MORE

  6. 4. Pollinators and Insect Pollination in Changing Agricultural Landscapes

    Author : Lina Herbertsson; Miljövetenskap; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; pollinators; pollination; agri-environment schemes; beekeeping; oilseed rape; sown flower strips; agri-environment measures;

    Abstract : Agricultural intensification and associated loss of semi-natural grasslands, has resulted in reduced landscape heterogeneity. A concomitant loss of forage and nest sites for pollinating insects has driven declines across several pollinator taxa. READ MORE

  7. 5. Bee foraging and pollination : Consequences of spatial and temporal variation in flower resources

    Author : Johanna Yourstone; Biodiversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Apoidea; bumblebee; foraging behavior; landscape ecology; land-use change; oilseed rape; trees; flower constancy; honeybee competition; functional traits; seminatural habitats; chili;

    Abstract : Wild bees foraging in contemporary agricultural landscapes are, because of agricultural intensification, faced with the challenges of reduced flower-rich habitats, as well as a changed spatio-temporal distribution of flower resources. As a result of this and other stressors such as pesticide exposure, widespread declines of bees have been reported. READ MORE