Sökning: "beaver pond"

Hittade 4 uppsatser innehållade orden beaver pond.

  1. 1. Beavers and environmental flow : the contribution of beaver dams to flood and drought prevention

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Wali Uz Zaman; [2019]
    Nyckelord :beaver dam; beaver pond; environmental flow; flood; drought; GIS;

    Sammanfattning : Before they were driven to near extinction, beavers populated the smaller rivers in Europe, Asia and North America. They are ecosystem engineers, since their dam building activities have a cascading effect on biogeochemistry, hydrology, ecosystem structure as well as biodiversity of the affected and surrounding area. LÄS MER

  3. 2. Retention of nitrogen in beaver ponds depends on colonization history : use of Fontinalis antipyretica as an integrative sampler of nitrogen

    Kandidat-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

    Författare :Anders Johansson; [2015]
    Nyckelord :beaver; ; castor fiber; colonization history; fontinalis antipyretica; nitrogen retention; nitrogen; recolonization; Sweden;

    Sammanfattning : Beaver ponds affect the environment in many ways and beaver ponds have the potential to retain macronutrients. The retention of nitrogen in beaver ponds has mainly been suggested to be due to denitrification by bacteria. LÄS MER

  4. 3. Effects of beaver dams on benthic macroinvertebrates

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Andreas Johansson; [2014]
    Nyckelord :;

    Sammanfattning : In the 1870's the beaver (Castor fiber), population in Sweden had been exterminated. Thebeaver was reintroduced to Sweden from the Norwegian population between 1922 and 1939.Today the population has recovered and it is estimated that the population of C. fiber in all ofEurope today ranges around 639,000 individuals. LÄS MER

  5. 4. Local and landscape effects on the diversity of plant communities in Swedish beaver ponds

    Master-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

    Författare :Joel Lönnqvist; [2014]
    Nyckelord :beaver pond; Castor fiber; aquatic plants; hydrophytes; helophytes; macrophytes; landscape; nitrogen; plant dispersal; catchment;

    Sammanfattning : The European beaver Castor fiber is considered an ecosystem engineer and a key species because of its dam building behavior. Little is known about the factors affecting plant diversity in beaver impounded streams. This study aimed to investigate if local and landscape variables affect plant diversity of beaver ponds. LÄS MER