Sökning: "colonization-extinction dynamics"

Hittade 4 avhandlingar innehållade orden colonization-extinction dynamics.

  1. 1. The importance of small forest set-asides for saproxylic biodiversity at stand- landscape- and regional scales

    Författare :Mari Therese Jönsson; Mittuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; boreal forest; colonization-extinction dynamics; dendrochronology; dead-wood dynamics; disturbance dynamics; forest history; fragmentation; metapopulations; national inventories; old-growth forest; picea abies; saproxylic species; set asides; spatiotemporal dynamics; stand reconstructions; tree mortality; woody debris; wood-decaying fungi; woodland key habitats; Biology; Biologi;

    Sammanfattning : .... LÄS MER

  3. 2. Distribution Patterns and Metapopulation Dynamics of Epiphytic Mosses and Lichens

    Författare :Tord Snäll; Håkan Rydin; Johan Ehrlén; Christine Ray; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; plant; metapopulation; model; parameterization; connectivity; dispersal; colonization; extinction; epiphytic; bryophyte; lichen; boreal; fragmentation; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

    Sammanfattning : This thesis examines the relative importance of local conditions, dispersal and dynamics of the trees on epiphyte distribution patterns and colonization-extinction dynamics. Study species are the mosses Orthotrichum speciosum and O. obtusifolium, and the red-listed Neckera pennata. LÄS MER

  4. 3. Insights into the ecology and genetics of lichens with a cyanobacterial photobiont

    Författare :Katja Fedrowitz; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Nature conservation requires an in-depth understanding of the ecological processes that influence species persistence in the different phases of a species life. In lichens, these phases comprise dispersal, establishment, and growth. LÄS MER

  5. 4. Distribution and persistence of epiphyte metapopulations in dynamic landscapes

    Författare :Victor Johansson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Habitat loss is a major cause of species extinction. Old trees have declined, and this continues because of poor management. Examples are development of secondary woodland in semi-open grasslands, and lack of natural tree regeneration. We therefore can expect that species associated with old tree are declining. LÄS MER