Search for dissertations about: "species traits"

Showing result 1 - 5 of 234 swedish dissertations containing the words species traits.

  1. 1. Functional Traits in Sphagnum

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Fia Bengtsson; Uppsala universitet.; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; peat mosses; functional traits; NPP; decay resistance; N2 fixation; desiccation resistance; climate; Biology with specialization in Ecological Botany; Biologi med inriktning mot ekologisk botanik;

    Abstract : Peat mosses (Sphagnum) are ecosystem engineers that largely govern carbon sequestration in northern hemisphere peatlands. I investigated functional traits in Sphagnum species and addressed the questions: (I) Are growth, photosynthesis and decomposition and the trade-offs between these traits related to habitat or phylogeny?, (II) Which are the determinants of decomposition and are there trade-offs between metabolites that affect decomposition?, (III) How do macro-climate and local environment determine growth in Sphagnum across the Holarctic?, (IV) How does N2 fixation vary among different species and habitats?, (V) How do species from different microtopographic niches avoid or tolerate desiccation, and are leaf and structural traits adaptations to growth high above the water table?Photosynthetic rate and decomposition in laboratory conditions (innate growth and decay resistance) were related to growth and decomposition in their natural habitats. READ MORE

  2. 2. Traits or species – space or environment

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Lina Ahlbäck; Sveriges lantbruksuniversitet.; [2014]

    Abstract : How communities are structured and the processes shaping species composition are among the basic questions in ecology. Knowledge about these processes is essential to predict changes in community composition in response to changes in for example climate or land use practices. READ MORE

  3. 3. Ground beetle dynamics in intensively managed agricultural landscapes

    University dissertation from Department of Biology, Lund University

    Author : Erkki Palmu; Lunds universitet.; Lund University.; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Carabidae; species richness; species diversity; functional traits; body size; emergence; dispersal; stable isotopes; deuterium; oxygen; crop diversification; landscape heterogeneity; agricultural management;

    Abstract : Popular Abstract in Swedish I denna avhandling har jag studerat jordlöparnas (Carabidae) dynamik i de intensivt brukade landskapen som återfinns i Skånes slättbygd. Jordlöpare är en artrik familj av rovlevande skalbaggar som är vanligt förekommande i jordbruksmark. READ MORE

  4. 4. Biotic resistance in freshwater fish communities

    University dissertation from Umeå : Umeå universitet

    Author : Anna Henriksson; Umeå universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; biotic resistance; freshwater fish; introductions; invasions; invasion success; invasibility; invasiveness; species richness; saturation; species identity; weighted species richness;

    Abstract : Invasions of non-native species cause problems in ecosystems worldwide, and despite the extensive effort that has been put into research about invasions, we still lack a good understanding for why some, but not other, communities resist these invasions. In this doctoral thesis I test hypotheses on biotic resistance using a large dataset of more than 1000 both failed and successful introductions of freshwater fish into Swedish lakes. READ MORE

  5. 5. Regional and local variation in plant species richness

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Cecilia Dupré; Uppsala universitet.; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; coastal meadows; deciduous forests; dry grasslands; grazing; habitat configuration; habitat quality; hump-shaped curve; life history traits; regional species pool; soil factors; Utvecklingsbiologi; NATURAL SCIENCES Biology Organism biology Developmental biology; NATURVETENSKAP Biologi Organismbiologi Utvecklingsbiologi; ekologisk botanik; Ecological Botany;

    Abstract : In this thesis, I examine the variation in plant species richness along gradients of productivity and disturbance in grasslands and forest habitats in southern Sweden, and I compare the documented patterns with theoretical predictions. Moreover, I evaluate the relative importance of habitat quality and habitat configuration for the occurrence of field layer species in deciduous forests. READ MORE