Sökning: "increased grazing pressure"

Visar resultat 16 - 20 av 20 avhandlingar innehållade orden increased grazing pressure.

  1. 16. Aeroacoustics Studies of Duct Branches with Application to Silencers

    Författare :Mikael Karlsson; Mats Åbom; Luc Mongeau; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silencer; muffler; confined flows; flow duct; aeroacoustics; vortex sound; acoustic multiports; linear stability; self-sustained oscillations; whistling; Herschel-Quincke tube; acoustic resonator; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : New methodologies and concepts for developing compact and energy efficient automotive exhaust systems have been studied. This originates in the growing concern for global warming, to which road transportation is a major contributor. LÄS MER

  3. 17. Effects of warming and browning on benthic and pelagic ecosystem components in shallow lakes

    Författare :Francisco Rivera Vasconcelos; Sebastian Diehl; Jan Karlsson; Christopher T. Solomon; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; benthic; pelagic; algae; consumers; browning; warming; shallow lakes; food web; dissolved organic matter;

    Sammanfattning : The majority of lakes on Earth are shallow, unproductive and located at high latitudes. These lakes are experiencing big changes due to climate change, where two environmental drivers operate simultaneously, browning and warming. How they affect lake ecosystems is not well understood. LÄS MER

  4. 18. Patterns of evolution in a young species, the Baltic seaweed Fucus radicans

    Författare :Angelica Ardehed; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Marine biology; Evolution;

    Sammanfattning : To be able to interpret patterns of biodiversity it is important to understand the processes by which new species evolve and how closely related species remain reproductively isolated and ecologically differentiated. This thesis centers on the evolution of the two brown algae Fucus radicans and Fucus vesiculosus in the Baltic Sea, where Fucus radicans very recently diverged from F. LÄS MER

  5. 19. Land use dynamics in the face of population increase. A study in the districts of Gatsibo and Nyagatare, Eastern Province, Rwanda

    Författare :Theophile NIYONZIMA; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; land use dynamics; land cover changes; population increase; cropping; livestock; political ecology; Rwanda;

    Sammanfattning : This thesis is about land use dynamics in areas undergoing population increase. The study was undertaken to clarify how the increasing population interacted with their physical environment through farming in Eastern Province, Rwanda. LÄS MER

  7. 20. Biomass patterns in boreal-subarctic lake food webs along gradients of light and nutrients

    Författare :Gustaf Thomsson; Sebastian Diehl; Dag Olav Hessen; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; boreal-subartic lake; cDOM; epilithon; benthic-pelagic coupling; carnivores;

    Sammanfattning : There is large natural variation in light and nutrient conditions across lakes. In the boreal-subarctic region most lakes are small, shallow and nutrient poor. In such lakes there is often sufficient light to support primary production at the lake bottom. LÄS MER