Essays about: "Usnea"

Found 3 essays containing the word Usnea.

  1. 1. Water storage in the lichen genus Usnea in Sweden and Norway : Can morphological and water storage traits explain the distribution and ecology of epiphytic species?

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Amanda Eriksson; [2015]
    Keywords : Usnea; hair lichens; water; water holding capacity; morphology;

    Abstract : Lichens are poikilohydric and cannot control water uptake and loss, water relations could therefore impact their distribution. This study examines if morphological, anatomical, and water storage traits could explain distribution of epiphytic species in the lichen genus Usnea. READ MORE

  3. 2. How is the distribution of the epiphytic lichen Usnea longissima affected by forest structure and logging history within stands?

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Ylva Linnman Wänglund; [2008]
    Keywords : Usnea longissima; epiphytic lichen; forest history; stand structure; canopy openness;

    Abstract : The boreal forests of Sweden have gone through radical changes during the last c. 100 years due to human activities. Many species, dependent on undisturbed forests with long canopy continuity and old-growth characteristics, are threatened today due to the loss of these habitats. READ MORE

  4. 3. Using a spatially precise approach to analyse the occurrence of Usnea longissima in relation to present and past stand structure : a case study in boreal Scandinavia

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Torbjörn Josefsson; [2004]
    Keywords : stand history; nature conservation; adaptive forest management;

    Abstract : To maintain biodiversity in managed forests, long-term trends in forest structure and ecological processes must be understood since these have a decisive influence on the distribution of many forest species, especially epiphytic lichens. To enhance the understanding of the complex occurrence of Usnea longissima Ash. READ MORE