Search for dissertations about: "liverworts"

Showing result 1 - 5 of 7 swedish dissertations containing the word liverworts.

  1. 1. Grow with the flow Hydrological controls of riparian vegetation in boreal stream networks

    Author : Lenka Kuglerová; Roland Jansson; Hjalmar Laudon; Birgitta Malm-Renöfält; John Stella; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; boreal forest; channelization; groundwater; Krycklan catchment; liverworts; mosses; riparian buffers; riparian vegetation; river restoration; species richness; stream network; stream size; vascular plants;

    Abstract : What drives species diversity across landscapes is one of the most fundamental questions in ecology. Further, understanding the mechanisms underlying species diversity patterns is important not only for forming and challenging ecological theories but also essential for appropriate landscape management and effective nature conservation. READ MORE

  2. 2. Aspects of heterogeneity effects of clear-cutting and post-harvest extraction of bioenergy on plants in boreal forests

    University dissertation from Umeå : Ekologi, miljö och geovetenskap

    Author : Marcus Åström; Christer Nilsson; Katherine Frego; [2006]
    Keywords : aspect; clear-cutting; disturbance; habitat quality; liverworts; logging residues; mosses; resilience; slash; slope; topography;

    Abstract : Abstract. The objectives of this thesis are to evaluate (1) the influence of slope aspect on boreal plant responses to clear-cutting and (2) the effects of post-harvest extraction of bioenergy (logging residues or slash) on plant composition, richness and performance in clear-cuts. READ MORE

  3. 3. Plants go with the flow predicting spatial distribution of plant species in the boreal forest

    University dissertation from Umeå : Ekologi och geovetenskap

    Author : Ursula Zinko; Christer Nilsson; Håkan Rydin; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; boreal forest; vascular plant; species richness; wetness index; soil pH; bryophyte; lichen; substrate; stand age; plot size; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi; ekologisk botanik; Ecological Botany;

    Abstract : The main objectives of this thesis are to study if a topographic wetness index (TWI) could be used as a tool for predicting the spatial distribution of vascular plant species richness in the boreal forest as well as to study congruence in species richness between vascular plants, liverworts, mosses and lichens. A wetness index ln(a/tanβ) based on topography was used to assign a specific TWI-value to every 20 x 20m grid in two 25 km2 boreal forest landscapes (differing in average soil pH) in northern Sweden. READ MORE

  4. 4. Living on the edge effectiveness of buffer strips in protecting biodiversity on boreal riparian forests

    University dissertation from Umeå : Ekologi och geovetenskap

    Author : Kristoffer Hylander; Christer Nilsson; Bengt Gunnar Jonsson; Ellen Macdonald; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; boreal forest; bryophyte; buffer strip; ecological boundary; edge effect; headwater stream; land snail; liverwort; moss; phytometer; riparian forest; substrate; terrestrial gastropod; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi; ekologisk botanik; Ecological Botany;

    Abstract : The objective of this thesis is to evaluate the ecological consequences of buffer strip retention on riparian and terrestrial biodiversity. Earlier studies on forest buffer strips have evaluated their effectiveness in relation to water quality and aquatic biota. However, forests along streams are species rich habitats for many organism groups. READ MORE

  5. 5. Rates and patterns of bryophyte molecular evolution

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Anna-Malin Linde; Ulf Lagercrantz; Nils Cronberg; D. Magnus Eklund; Jonathan Shaw; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biologi med inriktning mot evolutionär funktionsgenomik; Biology with specialization in Evolutionary Functional Genomics;

    Abstract : Plants have been growing on land for at least 450 million years. The bryophytes comprising the three phyla liverworts, mosses and hornworts, are considered to be the closest extant relatives to the plants that colonized land. READ MORE