Search for dissertations about: "Buteo"

Found 4 swedish dissertations containing the word Buteo.

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

   Author : Peter Hellström; Anders Angerbjörn; Xavier Lambin; Stockholms universitet; []
   Keywords : 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

4. 2. Interactions between rodents and rough-legged buzzards (Buteo Lagopus) in Northern Sweden

   Author : Peter Hellström; Stockholms universitet; []
   Keywords : ;

   Abstract : .... READ MORE

5. 3. Predator-prey interactions of raptors in an arctic environment

   Author : Jesper Nyström; Anders Angerbjörn; A. Rolf Ims; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology of raptors; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

   Abstract : This thesis concerns the predator-prey interactions of three raptor species in a Swedish arctic community: the gyrfalcon (Falco rusticolus), the rough-legged buzzard (Buteo lagopus) and the golden eagle (Aquila chrysaetos). The gyrfalcon behaved like a highly specialised ptarmigan (Lagopus spp.) predator. READ MORE

6. 4. Migration strategies of raptors – spatio-temporal adaptations and constraints in travelling and foraging

   Author : Roine Strandberg; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; route convergence; loop migration; mortality; spatio-temporal distribution patterns; pre- and post-migratory movements; daily travel routines; satellite tracking; fly-and-forage migration; raptors;

   Abstract : My dissertation is about bird migration and addresses questions about how raptors adapt to the fluctuating environments during the transition seasons between breeding and wintering. The migration is highly affected by local prey abundance, foraging strategies, weather conditions and landscape patterns along the migration routes as well as navigation and orientation mechanisms and cues. READ MORE