Sökning: "biotic variable"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden biotic variable.

  1. 1. Macroinvertebrate sampling in hydropeaking rivers : Testing Hester-Dendy samplers in a laboratory environment using different flow conditions

    Kandidat-uppsats, Karlstads universitet/Avdelningen för biologi

    Författare :Mattias Hansson; [2020]
    Nyckelord :hydropower; bioassessment; benthic macroinvertebrates; biotic indicator; vattenkraft; biologiska bedömningsgrunder; bentiska makroevertebrater; bioindikator;

    Sammanfattning : Degraded rivers and streams caused by disturbances have created a need for reliable tools to assess the ecological status of such ecosystems. Numerous methods and programs have been developed to assess ecological status using biological indicators, benthic macroinvertebrates are the most commonly used biotic indicator. LÄS MER

  3. 2. The effect of the interplay between fire frequency and grassland structure on tick abundances in the Hluhluwe-iMfolozi Park, South Africa

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Thilo Heinecke; [2020]
    Nyckelord :ticks; acari; pyrodiversity; grassland structure; fire ecology; fire frequency; grazing lawn;

    Sammanfattning : Fire in ecology is a very variable factor and its effects are best described as a complex feedback system with other biotic and abiotic factors. These feedback systems need to be understood to enable generalized conclusions about the influence of fire regimes. LÄS MER

  4. 3. Tea time for soils : decomposition experiments in Swedish long-term field trials

    Master-uppsats, SLU/Dept. of Ecology

    Författare :Olle Åkesson; [2017]
    Nyckelord :Tea Bag Index; SOC; SOC dynamics; stabilization; decomposition;

    Sammanfattning : Abstract Soils represent a large carbon pool, with almost twice the amount contained in living plant biomass and the atmosphere combined. Consequently, soil has a significant impact on the global C cycle and it is suggested that soil organic C (SOC) sequestration is one of the most cost-effective alternatives to counteract climate change. LÄS MER

  5. 4. Spatiotemporal variability in methane emission from an Arctic fen over a growing season : dynamics and driving factors

    Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Kirstine Skov; [2014]
    Nyckelord :seasonal variability; Arctic wetlands; physical geography; methane emission; biological factors.; geography; ebullition; environmental factors; spatial variability; Earth and Environmental Sciences;

    Sammanfattning : Resume. Metanudledning fra Nordlige vådområder udgør en betydelig del af den naturlige udledning af metan, en potent drivhusgas. Både fysiske og biologiske faktorer influerer produktion, oxidation og transport af metan og dermed netto udledningen. Udledningen af metan fra Nordlige vådområder viser stor rumlig og tidslig variation. LÄS MER

  7. 5. Characteristics of managed and unmanaged water bodies influencing their suitability as mosquito breeding habitats in Bahir Dar, Ethiopia

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Karolina Carlström; Elin Renstål; [2014]
    Nyckelord :Mosquitoes; breeding habitat; vector control; water characteristics; abiotic variable; biotic variable; Bahir Dar; Ethiopia; Mygg; mygglarvshabitat; vektorkontroll; vattenegenskaper; abiotisk variabel; biotisk variabel; Bahir Dar; Etiopien;

    Sammanfattning : Mosquito-borne diseases like malaria, dengue fever, yellow fever and West Nile virus are serious problems in many parts of the world, especially in Africa, and partially in Ethiopia. Millions of people become infected and several hundred thousand people die worldwide from these diseases every year. LÄS MER