Search for dissertations about: "Perisoreus infaustus"

Found 5 swedish dissertations containing the words Perisoreus infaustus.

  2. 1. Behaviour and life-history responses to chick provisioning under risk of nest predation

    Author : Sönke Eggers; David Winkler; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; Chick provisioning; clutch size; delayed dispersal; nest concealment; nest predation; parental care; population decline; Perisoreus infaustus; Siberian jay; Biologi; Biology; Biologi; populationsbiologi; Population Biology;

    Abstract : This thesis examines risk management in breeding Siberian jays (Perisoreus infaustus), which is indigenous to the northern taiga. Parent behaviour and the nest are cryptic. A new nest is built each year. It is placed on spruce or pine branches close to the trunk and well insulated with lichens, feathers and reindeer hair. READ MORE

  4. 2. The Nepotistic Parent; Predator Protection, Kinship and Philopatry

    Author : Michael Griesser; Jan Ekman; Ronald Mumme; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; referential alarm calls; delayed dispersal; nepotism; vigilance; alarm calling; mobbing; extended parental care; families; Perisoreus infaustus; Siberian jay; Biologi; Biology; Biologi; populationsbiologi; Population Biology;

    Abstract : Evolution is fuelled by independent reproduction events. Yet, the offspring of at least three percent of all bird species postpone dispersal and forego independent reproduction. READ MORE

  5. 3. Effects of Habitat Quality on Behavioural Decisions and Population Dynamics in the Siberian Jay

    Author : Magdalena Nystrand; Jan Ekman; Erik Matthysen; Uppsala universitet; []
    Keywords : Biology; Perisoreus infaustus; relatedness; delayed dispersal; predation risk; foraging; trade-off; demography; source-sink dynamics; forest structure; Biologi;

    Abstract : The dynamics of natural populations may be influenced by a variety of factors, ranging from feeding interference and territoriality to the risk of predation and climatic effects. The relative influence of these factors may be contingent upon the quality of the habitat in which individuals reside. READ MORE

  6. 4. Population Genetic Analyses of Natal Dispersal and Substructure in Three Bird Species

    Author : Tobias Sahlman; Jan Ekman; Jacob Höglund; Ben J. Hatchwell; Uppsala universitet; []
    Keywords : Ecology; Perisoreus infaustus; Gallinago media; Lagopus muta; relatedness; philopatry; biased dispersal; phylogeography; microsatellite; mitochondrial DNA; Ekologi;

    Abstract : Genetic variation within and among populations is a result of past and ongoing processes. Among the most important of such processes are dispersal, habitat fragmentation and selection. This thesis use neutral genetic variation as a tool to investigate these processes in three bird species. READ MORE

  7. 5. Strengthening conservation through green infrastructure : linking protected areas, habitats and species

    Author : Ewa Orlikowska; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The green infrastructure (GI) concept was developed to mitigate habitat fragmentation. The European Union (EU) defines GI as “a strategically planned network of natural and semi-natural areas …designed and managed to deliver a wide range of ecosystem services and to improve connectivity of protected areas in order to promote multifunctional landscapes”. READ MORE