Search for dissertations about: "Seed predation"

Showing result 21 - 24 of 24 swedish dissertations containing the words Seed predation.

  2. 21. Genetics and ecology of natural populations

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

    Abstract : 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. READ MORE

  4. 22. Effects of created habitats on farmland biodiversity

    Author : Annelie Jönsson; Biodiversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; agricultural intensification; brown hare; common pheasant; farming intensity; granivorous passerines; grey partridge; habitat creation; landscape heterogeneity; pollinators;

    Abstract : Agricultural intensification has caused severe declines among biodiversity in European farmland over the last half century. The transformation of the agricultural landscape has led to reduced availability of key resources such as food, nesting habitat and shelter. READ MORE

  5. 23. Ecotoxicological assessment by microcosm tests on plankton communities

    Author : Pardis Pirzadeh; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; limnologi; Marinbiologi; aquatic ecology; limnology; Ecology; Ekologi; Hydrobiology; marine biology; musk substances; brominated flame retardants; structural effects; akvatisk ekologi; Environmental chemistry; Miljökemi; mesocosm;

    Abstract : The aim of this thesis is to present a short-term plankton community toxicity test in laboratory microcosms, with which the effect of the test substance on species abundance and composition of the community is evaluated. This laboratory microcosm is an intermediate between single-species tests and outdoor mesocosm tests. READ MORE

  6. 24. Capture-based mud crab (Scylla serrata) aquaculture and artisanal fishery in East Africa- Practical and ecological perspectives : Mud crab ecology and aquaculture

    Author : David Oersted Mirera; Per-Olav Moksnes; Olof Linden; Max Troell; Lewis Le Vay; Linnéuniversitetet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Mud crab; ecology; aquaculture; economics; Akvatisk ekologi; Aquatic Ecology;

    Abstract : Mud crab Scylla serrata is a crustacean that spends most of its life cycle in the mangrove environment throughout its range. Fishery and aquaculture of this crab are significant economic activities in coastal areas in the tropics and sub-tropics because of the meat quality and nutritional value. READ MORE