Sökning: "take-off ability"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden take-off ability.

  1. 1. Behaviour under predation risk in birds

    Författare :Cecilia Kullberg; Neil B Metcalfe; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal physiology; Zoofysiologi;

    Sammanfattning : Predation is a major selective force in the evolution of both morphological and behavioural characters in animals. The flexibility in behavioural traits according to perceived predation risk has received much attention in recent years. LÄS MER

  3. 2. Attacking predators and fleeing prey : detection, escape and targeting behaviour in birds

    Författare :Ulrika Kaby; Innes Cuthill; Stockholms universitet; []
    Nyckelord :zoology; ethology; birds; animal behaviour;

    Sammanfattning : The aim of this thesis is to further our understanding of predator and prey behaviour and decision making in different attack situations. The thesis deals with escape strategies, predator detection ability and prey targeting behaviour. LÄS MER

  4. 3. Bird-parasite interactions : Using Sindbis virus as a model system

    Författare :Karin M. Lindström; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Carduelis chloris; Sindbis virus; host-parasite interaction; ornament; social dominance; testosterone; sexual selection; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; populationsbiologi; Population Biology;

    Sammanfattning : This thesis focuses on the evolutionary interactions between birds and a parasite, the mosquito-borne Sindbis virus (Togaviridae, Alphavirus). In conclusion, the results show that the Sindbis virus is widespread among birds, and that the fitness of infected hosts may be reduced by the virus. LÄS MER

  5. 4. Escape flight in butterflies

    Författare :Maria Almbro; Cecilia Kullberg; Ronald Rutowski; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Flight; Lepidoptera; gamete load; lipid accumulation; predation risk; hibernation; Biology; Biologi; zoologi; Zoology;

    Sammanfattning : Flight is considered to be the overarching reason for the enormous diversity and world-wide abundance of insects. Not only does flight enable great distances to be covered and new areas to be colonised, flying has also evolved to be important in most adult life-history characteristics from reproduction to anti-predator strategies. LÄS MER

  7. 5. Technology use in everyday activities among older adults with mild cognitive impairment : a study of changes over time and views on technology as support

    Författare :Annicka Hedman; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : The overall aim of this thesis was to provide new knowledge of everyday technology (ET) use and functioning over time, as perceived by persons with cognitive decline due to mild cognitive impairment (MCI). A secondary aim was to increase knowledge about their views on technology as part of and as potential support in everyday life. LÄS MER