Sökning: "insect frass"

Hittade 4 avhandlingar innehållade orden insect frass.

  1. 1. Impacts and drivers of insect herbivory on element cycling in forests globally

    Författare :Bernice Hwang; MERGE: ModElling the Regional and Global Earth system; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biogeochemical cycling; folivory; insect cadavers; insect frass; insect herbivory; litter decomposition; nutrient cycling; carbon; nitrogen; phosphorus; silicon; silica;

    Sammanfattning : The effects of insect herbivores on forest functioning are not well understood even though they can have important impacts on ecosystem processes by intercepting foliage before resorption and depositing nutrient-rich materials to the soil. In this thesis, I investigated the impact and drivers of insect folivores on carbon (C), nitrogen (N), phosphorus (P) and silica (Si) cycling in broadleaf forests, and how this varies with major climate variables. LÄS MER

  3. 2. Biogeochemistry in Subarctic birch forests : Perspectives on insect herbivory

    Författare :Jeppe Ågård Kristensen; MERGE: ModElling the Regional and Global Earth system; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biogeochemistry; Aboveground-belowground interactions; Herbivory; Insects; Subarctic; Birch; soil microbes;

    Sammanfattning : Herbivory can influence ecosystem processes, partly through long-term changes of the plant community compositions, but also more rapidly through the herbivores’ digestive alteration of the organic matter that is cycled through the soil and back to the primary producers. In the Subarctic mountain birch (Betula pubescens ssp. LÄS MER

  4. 3. Microbes Associated with Hylobius abietis : A Chemical and Behavioral Study

    Författare :Muhammad Azeem; Anna Karin Borg-Karlson; Irena Valterová; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hylobius; Ewingella; Penicillium; Heterobasidion; Bacteria; Fungi; Bark; Forest waste; Metabolites; Styrene; Methyl salicylate.;

    Sammanfattning : This thesis is based on three inter-related studies: the first part deals with the microbial consortium, the identification of microbes and their volatiles, the second part deals with the study of bio-chemical control methods of two conifer pests; the pine weevil Hylobius abietis (L.) and the root rot fungi Heterobasidion spp. LÄS MER

  5. 4. Chemical signals in interactions between Hylobius abietis and associated bacteria

    Författare :Karolin Axelsson; Jenny Lindh; Anna-Karin Borg-Karlson; Gunaratna Kuttuva Rajarao; Benedicte Albrectsen; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Pine weevil; Hylobius; Rahnella; Pseudomonas; bacteria; fungi; metabolites; 2-methoxyphenol; 2-phenylethanol; Kemi; Chemistry;

    Sammanfattning : The pine weevil (Hylobius abietis L.) is one of the two topmost economically important insect pests in Swedish conifer forests. The damage increase in areas were the silvicultural practice is to use clear cuttings were the insects gather and breed. LÄS MER