Sökning: "pollinators"

Visar resultat 31 - 35 av 45 avhandlingar innehållade ordet pollinators.

  1. 31. Ecology and management of crop pollination and pest control : insights from red clover seed production

    Författare :Ola Lundin; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The agricultural landscape has gone through large changes to meet increasing demands for food. This has led to major biodiversity declines, while effects on ecosystem services that support agricultural productivity, such as pollination and pest control, remain less studied. LÄS MER

  3. 32. Genetics and ecology of natural populations

    Författare :Elisabeth Lundqvist; Ulf Lagercrantz; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Angelica archangelica; Bistorta vivipara; Viscaria alpina; Eiseniella tetraedra; ecotypes; hydrochory; genetic differentiation; clone diversity; genetic patterns; riparian;

    Sammanfattning : I have studied the genetic variation of single species using morphological variation and enzyme electrophoresis. I have striven to understand the interaction between the breeding structure and the ecology of the species in relation to the community, in which it lives. The work was done in the county of Västerbotten, northern Sweden. LÄS MER

  4. 33. Biotic and abiotic drivers of life-history and demographic variation in boreal orchids

    Författare :Matthew R. Tye; Nina Sletvold; Yvonne Buckley; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plant demography; life-history; climate; pollination; compensation; orchids; resources; Biology with specialization in Ecological Botany; Biologi med inriktning mot ekologisk botanik;

    Sammanfattning : Environmental interactions, including both abiotic and biotic factors, are key drivers of life-history and population dynamics. Despite this, most population studies do not explicitly link variation in environmental factors and vital rates. LÄS MER

  5. 34. To Bee or Not to Be : Critical Floral Resources of Wild-Bees

    Författare :Magnus Larsson; Anders L Nilsson; Jon Ågren; Björn Cederberg; James H Cane; Uppsala universitet; []
    Nyckelord :Ecology; Andrena hattorfiana; Andrena marginata; Andrenidae; Knautia arvensis; limitation; oligolecty; pollen; pollination; solitary bee; specialist bee; Succisa pratensis; Ekologi;

    Sammanfattning : In recent decades, the development of strategies to prevent or slow the loss of biodiversity has become an important task for ecologists. In most terrestrial ecosystems wild-bees play a key role as pollinators of herbs, shrubs and trees. The scope of this thesis was to study 1) pollinator effectiveness of specialist bees vs. LÄS MER

  7. 35. Insect pollination of oilseed rape

    Författare :Sandra Lindström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Ecological intensification of agriculture is suggested as a way to reach higher crop yields without increasing inputs that may degrade the environment. Increased insect pollination in crops, such as oilseed rape, Brassica napus, has been suggested to increase yields, but is rarely integrated in crop management. LÄS MER