Sökning: "Tetraonidae"

Hittade 2 avhandlingar innehållade ordet Tetraonidae.

  1. 1. Cycles of voles, predators, and alternative prey in boreal Sweden

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Birger Hörnfeldt; Umeå universitet.; [1991]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; 3-4 year cycles; Clethrionomys glareolus; Clethrionomys rufocanus; Microtus agrestis; snap-trapping; rate of change; population regulation; delayed density-dependence; time-lag mechanism; seasonality; predation; food; predator avoidance; foraging behaviour; Aegolius funereus; nest boxes; numerical response; nomadism; Vulpes vulpes; Sarcoptes scabiei vulpes; Lepus timidus; Francisella tularensis; Tetraonidae; hunting statistics; zooekologi; Animal Ecology;

    Sammanfattning : Bank voles, grey-sided voles, and field voles had synchronous 3-4 year density cycles with variable amplitudes which averaged about 200-fold in each species. Cycles of vole predators (red fox and Tengmalm's owl), and their (foxes') alternative prey (mountain hare and forest grouse) lagged behind the vole cycles. LÄS MER

  2. 2. Reproductive behaviour in tetraonidae with special reference to males

    Detta är en avhandling från Stockholm : Stockholm University

    Författare :Ingemar Hjorth; Stockholms universitet.; [1970]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Etologi; Fortplantning; Fåglar; Tuppar;

    Sammanfattning : .... LÄS MER