Sökning: "extinction risk"

Visar resultat 31 - 35 av 43 avhandlingar innehållade orden extinction risk.

  1. 31. Establishment, Growth and Population Dynamics in two Mosses of Old-growth Forests

    Författare :Karin Wiklund; Håkan Rydin; Staffan Karlsson; Lloyd Stark; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Buxbaumia viridis; Neckera pennata; bryophyte; pH; phosphorus; water potential; precipitation; metapopulation; environmental stochasticity; ecology; plant; Biologi; Biology; Biologi;

    Sammanfattning : Biodiversity in forests depends on long canopy continuity and existence of different elements which function as substrates for varying organisms. Bryophytes often occupy specific substrates with a patchy distribution. LÄS MER

  3. 32. Functional Extinctions of Species in Ecological Networks

    Författare :Torbjörn Säterberg; Bo Ebenman; Kevin McCann; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Functional extinctions; Extinctions; Fisheries management; Ecologically Effective Population sizes;

    Sammanfattning : Current rates of extinctions are estimated to be around 1000 times higher than background rates that would occur without anthropogenic impacts. These extinction rates refer to the traditional view of extinctions, i.e. numerical extinctions. LÄS MER

  4. 33. Sköra subjekt och apofatiska resor : En feministteologisk studie av svensk samtidslitteratur

    Författare :Cecilia Samuelsson; Maria Essunger; Mattias Martinson; Eva Heggestad; Uppsala universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Worldview studies; Worldviews research; Feminist theology; Literary studies; Literary resistance; Interdisciplinary studies; Journey to the underworld; Subject; Subject formations; Nomadic subject; Systematic Theology and Studies in Worldviews; Systematisk teologi med livsåskådningsforskning;

    Sammanfattning : This study examines literary portrayals of existential problems relating to women’s experiences of being denied as subjects, and how literature and writing can offer ways of reflecting upon questions of being a subject and lived forms of resistance. The material consists of six contemporary Swedish novels. LÄS MER

  5. 34. Distribution and abundance of genetic variation in the arctic fox

    Författare :Love Dalén; Anders Angerbjörn; Robert K. Wayne; Stockholms universitet; []
    Nyckelord :population genetics; DNA; ecology; population history; gene flow; Alopex lagopus;

    Sammanfattning : This thesis investigates how changes in population size and spatial movements of individuals have shaped the distribution and abundance of neutral genetic variation in the arctic fox. This is done through mitochondrial and microsatellite DNA analyses on samples covering most of the species’ distribution, but with special emphasis on Scandinavia. LÄS MER

  7. 35. Evolution of Dispersal and Habitat Exploration in Butterflies

    Författare :Ulf Norberg; Hans Van Dyck; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ethology and behavioural ecology; Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : The development of wings may be one of the most important reasons for the great diversity among insects. Being able to move makes it possible to colonise new areas and explore resources in the surroundings. However, developing dispersal-related traits, like wings or flight muscles, is costly and moving can also be dangerous. LÄS MER