Sökning: "bumblebee"

Visar resultat 1 - 5 av 15 uppsatser innehållade ordet bumblebee.

  1. 1. Bumblebee learning flights at a flower : viewing direction on departure is influenced by landmark position on approach

    Master-uppsats, Linköpings universitet/Biologi

    Författare :Michael Plante-Ajah; [2019]
    Nyckelord :bumblebee; bee; learning flight; insect navigation;

    Sammanfattning : Bumblebees, like other Hymenopterans, perform learning flights when departing their nest for the first few times or when departing from a newly discovered food source. As bees can learn about the landmarks around a flower both on approach and on departure, it is possible that what they see and learn on approach affects what they focus on during their learning flight on departure. LÄS MER

  2. 2. The effect of ecological forest restoration on bumblebees (Bombus spp.) in the boreal forest

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

    Författare :Raisja Spijker; [2018]
    Nyckelord :bumblebee; Bombus spp.; forest restoration; abundance; species richness; species composition; boreal forest;

    Sammanfattning : Insect pollinators are an important part of biodiversity, yet the number of pollinating insects is declining all over the world. Of all the wild plant species about 80% are reliant on insect pollinators, with bees being most important. One of the main causes behind the decline of insect pollinators is the loss and fragmentation of habitats. LÄS MER

  3. 3. Interactions between bumblebees and cyanobacterial blooms

    Kandidat-uppsats, Lunds universitet/Miljövetenskaplig utbildning

    Författare :Frida Brodin Larsson; [2017]
    Nyckelord :Pollinators; Bombus terrestris; cyanobacteria; eutrophication; Microcystins; toxic; cyanobacterial blooms; Microcystis aeruginosa; Earth and Environmental Sciences;

    Sammanfattning : Today pollinators provide an important ecosystem service as they contribute to the pollination of 75 % of the world’s most important crop yields. Several bee species are threatened though due to different anthropogenic impacts and have declined in numbers. LÄS MER

  4. 4. Neonikotinoiders inverkan på pollinatörer

    Kandidat-uppsats, SLU/Department 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. 5. Bumblebee abundance decreases with growing amount of arable land at a landscape level

    Kandidat-uppsats, Linköpings universitet/Biologi

    Författare :Gabriella Fjellander; [2017]
    Nyckelord :Bombus; bumblebees; spatial scale; landscape; arable land; abundance; Sweden;

    Sammanfattning : Society depends on bumblebees for the ecosystem service in the pollination of crops. Bumblebee declines have been documented, mostly due to intensification of agriculture and loss of species-rich semi-natural grasslands, an important bumblebee habitat. LÄS MER