Sökning: "Cycles"

Visar resultat 21 - 25 av 1032 avhandlingar innehållade ordet Cycles.

  1. 21. Effects of size-dependent predation and competition on population and community dynamics

    Författare :Karin Nilsson; Lennart Persson; Volker Rudolf; Umeå universitet; []
    Nyckelord :size-structure; cannibalism; resource competition; predation; emergent facilitation; population regulation; population dynamics; overcompensation; density-dependence; cycles; zooekologi; Animal Ecology;

    Sammanfattning : Most animals grow substantially during their lifetime and change in competitive ability, predatory capacity and their susceptibility to predation as they grow. This thesis addresses the implications of this on regulation and dynamics within populations as well as between population interactions. LÄS MER

  3. 22. Population dynamics of tundra-living grey-sided voles

    Författare :Per Ekerholm; Lauri Oksanen; Rolf Anker Ims; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Population dynamics; Tundra; Grey-sided vole; Cycles; Vole specialist predators; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; zooekologi; Animal Ecology;

    Sammanfattning : This thesis deals with the dynamics of tundra living voles with emphasis on the most common one, the grey-sided vole (Clethrionomys rufocanus). The tundra area chosen for the study was Finnmarksvidda, a vast flatland in northernmost Norway. LÄS MER

  4. 23. Unguja Ukuu on Zanzibar : An archaeological study of early urbanism

    Författare :Abdurahman Juma; Paul Sinclair; Chapurukha M Kusimba; Uppsala universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Archaeology; cultural complexity; cycles; early urbanism; and urban characterization; Arkeologi; Archaeology subjects; Arkeologiämnen;

    Sammanfattning : This study describes archaeological excavations carried out at Unguja Ukuu on the main island of Zanzibar, Tanzania. The site has long remained obscure, oral histories do not mention it and no particular group among the living community of the island describes its origin from the site. LÄS MER

  5. 24. Geographic variation in life cycles : Local adaptation and ecological genetics in a temperate butterfly

    Författare :Olle Lindestad; Karl Gotthard; Sören Nylin; Christopher W Wheat; Greg Ragland; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; voltinism; local adaptation; insect; life cycle; seasonality; genomics; life history; zoologisk ekologi; Animal Ecology;

    Sammanfattning : Conditions in nature change with the seasons, necessitating seasonal adaptations that synchronize the life cycles of organisms with their surroundings. Such regulatory adaptations must vary between populations to track local variation in climate and seasonality; this local adaptation is facilitated by locally specific seasonal cues, but may be hampered by gene flow and genetic history. LÄS MER

  7. 25. Predator-prey dynamics in small mammals along gradients of primary productivity

    Författare :Tarja Oksanen; Christian Otto; N. C. Stenseth; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; cycles; herbivory; lemmings; mustelids; predation; productivitly; spatial heterogeneity; taiga; trophic exploitation; tundra;

    Sammanfattning : .... LÄS MER