Search for dissertations about: "species traits"

Showing result 1 - 5 of 237 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]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    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. Multi-trait Branching Models with Applications to Species Evolution

    University dissertation from Uppsala : Department of Mathematics

    Author : Daniah Tahir; Uppsala universitet.; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Markov models; branching processes; density dependence; discrete traits; species trees; diversification rates; diffusion approximation;

    Abstract : This thesis provides an analysis of the evolution of discrete traits and their effect on the birth and survival of species using the theory of supercritical, continuous time Markov branching processes. We present a branching modeling framework that incorporates multi-trait diversification processes associated with the emergence of new species, death of existing species, and transition of species carrying one type of a trait to another. READ MORE

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

    University dissertation from Department of Biology, Lund University

    Author : Erkki Palmu; Lunds universitet.; Lund University.; 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

  5. 5. 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