Sökning: "Richard Ericson"

Hittade 3 avhandlingar innehållade orden Richard Ericson.

  1. 1. Top-down and bottom-up effects in a Fennoscandian tundra community

    Författare :Doris Grellmann; Lars Ericson; Lauri Oksanen; Richard Inouye; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; consumer-resource interactions; exclosures; food web dynamics; grey-sided voles; lemmings; NPK-fertilization; plant defences; reindeer; soil microbes; vertebrate grazing;

    Sammanfattning : The objective of this thesis was to investigate the effects of mammalian grazers, such as microtine rodents and reindeer, (top-down effects) and nutrient availability (bottom- up effects) on the plant community of a tundra heath.I conducted a large-scale fertilization experiment and studied the impact of grazers using exclosures. LÄS MER

  3. 2. The Organised Nature of Power : On Productive and Repressive Interventions Based on Considerations of Risk

    Författare :Magnus Hörnqvist; Janne Flyghed; Richard Ericson; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Power; Productive; Repressive; Risk; State; Foucault; Marx; Criminology; Kriminologi; kriminologi; Criminology;

    Sammanfattning : Four interventions are analysed: the activity guarantee for long term unemployed, the customs control of border crossers, the cognitive skills training program and the conditions of incarceration among prison inmates. The interventions are performed by state organisations, based on considerations of risk and involve the exercise of power in a productive or repressive form. LÄS MER

  4. 3. Molecular systematics of the antbird-ovenbird complex (Aves: Furnariida)

    Författare :Martin Irestedt; Per G. P. Ericson; Richard O. Prum; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; systematics phylogeny DNA antbird ovenbird; Biology; Biologi;

    Sammanfattning : This thesis concerns the phylogenetic relationships among suboscine birds with special emphasis on the antbird-ovenbird complex (Aves: Furnariida). The principal aim is to produce a framework for future systematic and comparative studies of suboscines by generating robust phylogenetic hypotheses from DNA-sequence data. LÄS MER