Search for dissertations about: "Vulpes lagopus"

Showing result 1 - 5 of 7 swedish dissertations containing the words Vulpes lagopus.

  1. 1. Predator responses to non-stationary rodent cycles

    Author : Peter Hellström; Anders Angerbjörn; Xavier Lambin; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Buteo lagopus; Vulpes lagopus; Lemmus; Myodes; population cycles; predation; numerical response; functional response; arctic; lemmings; voles; fox; monitoring; raptors; zoologisk ekologi; Animal Ecology;

    Abstract : Regular fluctuations in population size, cycles, are common in small mammals and have important effects on predator populations and life histories. In this thesis, I identify long-term patterns and processes in two specialist predators, the arctic fox Vulpes lagopus and the rough-legged buzzard Buteo lagopus, in relation to their prey (lemmings and voles) and in the case of the arctic fox also to a dominant competitor, the red fox Vulpes vulpes. READ MORE

  2. 2. Studies of declining populations - temporal genetic analyses of two arctic mammals

    Author : Veronica Nyström; Anders Angerbjörn; Lisette Waits; Stockholms universitet; []
    Keywords : Vulpes lagopus; Mammuthus primigenius; population reduction; extinction; ancient DNA; mitochondrial DNA; microsatellites; genetic variation; NATURAL SCIENCES; NATURVETENSKAP; zoologisk ekologi; Animal Ecology;

    Abstract : Many populations and species are threatened with extinction today. Understanding the extinction process and the factors behind population decline is therefore important. READ MORE

  3. 3. Survival in a small and endangered arctic fox (Vulpes lagopus) population

    Author : Tomas Meijer; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Ethology and behavioural ecology; Etologi och beteendeekologi; Animal Ecology; zoologisk ekologi;

    Abstract : .... READ MORE

  4. 4. To survive and reproduce in a cyclic environment – demography and conservation of the Arctic fox in Scandinavia

    Author : Tomas Meijer; Anders Angerbjörn; Bodil Elmhagen; Claudio Sillero-Zubiri; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Conservation; life-history; Alopex lagopus; survival; zoologisk ekologi; Animal Ecology;

    Abstract : This thesis concerns the conservation and life history of the Arctic fox (Vulpes lagopus) in Scandinavia. The Arctic fox was historically a widely distributed species in the Scandinavian mountain tundra with a population size of approximately 10 000 individuals during years with high resource availability, i.e. rodent peaks. READ MORE

  5. 5. Spatial and temporal population dynamics in the mountain tundra – mesopredator and prey

    Author : Rasmus Erlandsson; Anders Angerbjörn; Dennis Murray; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; population dynamics; cyclic; mountain tundra; arctic fox; Norwegian lemming; small rodents; mesopredator; predation; survival; reproduction; zoologisk ekologi; Animal Ecology;

    Abstract : It is well known that competition, predation and fluctuating food resources can have strong effect on individual fitness and population dynamics. The complexity of natural systems can make it complicate to disentangle those processes, but environments with relatively simple food webs, and strong cyclic population dynamics offer contrasting conditions resembling experimental treatments. READ MORE