Avancerad sökning

Hittade 4 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Bumblebee resource dynamics : a review of foraging and nesting in the agricultural landscape

    Kandidat-uppsats, SLU/Dept. of Ecology

    Författare :Anna Douhan Sundahl; [2020]
    Nyckelord :bumblebees; bumblebee population dynamics; bumblebee drivers; flower strips; competition with honeybees; foraging; nesting; hibernation;

    Sammanfattning : 90 % of all plants on earth either benefits or entirely depends on pollination. There are pollinators among families of bees (Apidea), butterflies (Lepidoptera) and birds (Aves). Bees of genus Bombus spp., bumblebees, are especially important and provide pollination service for 80 % of the crops of Europe and many wild plant species. LÄS MER

  3. 2. Vegetation responses to summer- and winter warming : flower power in the Alaskan tussock tundra?

    Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Maja Wressel; [2018]
    Nyckelord :Arctic vegetation; snow depth; warming; vertical root distribution; tundra;

    Sammanfattning : Plants have an important role in the tundra carbon (C) cycle by storing C in primary production and thus potentially counteract the C released from thawing permafrost. Tundra vegetation is limited by nitrogen (N), which is predicted to increase with rising temperatures and increased snow depth. LÄS MER

  4. 3. Neonikotinoiders inverkan på pollinatörer

    Kandidat-uppsats, SLU/Dept. of Biosystems and Technology (from 130101)

    Författare :Jerker Andervad; Erika Bernalt; [2017]
    Nyckelord :Neonikotinoid; pollinatör; honungsbi; vilda bin; pesticid; insekticid; humla; imidakloprid; diversitet;

    Sammanfattning : Neonikotinoider (NN) hör till världens mest använda pesticider mot skadedjur. NN sprider sig i naturen och har hittats i dammpartiklar, mark och ytvatten. NN sprids i hela plantan till nektar, pollen och guttationsdroppar vilket i sin tur drabbar oavsiktliga mål som pollinatörer. LÄS MER

  5. 4. Effects of low quality soil, drought and systemic pesticides on plant flowering traits in Brassica Napus L.

    Kandidat-uppsats, Lunds universitet/Miljövetenskaplig utbildning

    Författare :Sofie Vessling; [2016]
    Nyckelord :Agriculture; Flower density; Pollen production; Insect pollination; Pollination; Drought; Low quality soil; Clothianidin; Climate change; Neonicotinoids; Brassica Napus; Plant resources; Rapeseed; Nectar production; Systemic pesticide; Flower traits; Agriculture and Food Sciences; Biology and Life Sciences; Earth and Environmental Sciences;

    Sammanfattning : One of the most important ecosystem services is animal pollination, which has been found to increase both crop quantity and quality and hence is important for sustainable food production. To provide food to an increasing population, farming systems are intensifying to maintain high crop yields. LÄS MER