Sökning: "Biodiversitet"

Visar resultat 1 - 5 av 48 avhandlingar innehållade ordet Biodiversitet.

  1. 1. Disturbance Effects on Plant and Mycorrhizal Communities in Sandy Grasslands

    Författare :Tim Krone Schnoor; Biodiversitet; []

    Sammanfattning : Many ecosystems have historically been disturbed, either naturally or as part of a cultural management. Due to loss of species as a result of too little disturbance, disturbance must be considered as a potential tool for conservation and restoration in various ecosystems. In this thesis work, disturbance effects on a grassland system were studied. LÄS MER

  2. 2. Effects of Farming Practice on Pollinators and Pollination across Space and Time

    Författare :Georg Andersson; Biodiversitet; []

    Sammanfattning : Several studies have found that organic farms support higher biodiversity, but results vary between studies such that some also show no or even negative effects. There can be many reasons why studies comparing organic and conventional farming show conflicting results. LÄS MER

  3. 3. Identification of Virulence Factors in Nematode-Trapping Fungi - Insights from Genomics, Transcriptomics and Proteomics

    Författare :Karl-Magnus Andersson; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nematode-trapping fungi; comparative genomics; comparative transcriptomics; proteomics; virulence factors; parasitism;

    Sammanfattning : Nematode-trapping fungi are soil-living organisms with the unique ability to capture and infect free-living nematodes. The interest in studying these fungi arises from their potential use as biological control agents for plant- and animal-parasitic nematodes. LÄS MER

  4. 4. Ecology of parasitoids and their hosts in oilseed rape fields

    Författare :Josef Berger; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 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;

    Sammanfattning : 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. LÄS MER

  5. 5. The threat from non indigenous species - ecosystem vulnerability, global distribution and co-occurrence with other major threats

    Författare :Helena Berglund; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; threats; distribution range; isolation; endemism; invasions; invaders; vulnerability; non indigenous species; rarity; threatened species;

    Sammanfattning : We live in a globalised world where people and goods travel large distances. Various species are brought along on these journeys, intentionally or as hitchhikers. Some of these species establish populations in regions to which they could not have spread without human assistance, and where they are considered to be non indigenous species (NIS). LÄS MER