Search for dissertations about: "Crypsis"

Showing result 1 - 5 of 6 swedish dissertations containing the word Crypsis.

  2. 1. On the origin of polymorphism - consequences of competition and predation in heterogeneous environments

    Author : Jennie Holmér; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; source-sink dynamics; predation; competition; dispersal; polymorphism; evolution; crypsis; adaptive dynamics;

    Abstract : In this thesis, I have studied when an initially monomorphic population can diverge into two morphs in a heterogeneous environment. Evolution is driven by competition for resources or predation. In Paper I, we studied source-sink dynamics during evolution in an environment with two types of resource of different abundance in two habitats. READ MORE

  4. 2. Antipredator defence in butterflies

    Author : Martin Olofsson; Christer Wiklund; Graeme Ruxton; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Antipredator defence; Bird; Crypsis; Predator; Predator-prey interaction; Prey-attack behavior; Butterfly; Deimatic behavior; Eyespots; Startle display; zoologisk ekologi; Animal Ecology;

    Abstract : Predation exerts a potent selection mechanism and has resulted in a suite of antipredation adaptations encompassing morphological and behavioral traits in prey. In butterflies, several such traits appear to be directed towards birds which are considered as one of their major predators. READ MORE

  5. 3. Aposematism, Crypsis and Population Differentiation in the Strawberry Poison Frog

    Author : Andreas Rudh; Anna Qvarnström; Jacob Höglund; Michael Speed; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; co-evolution; population divergence; natural selection; sexual selection; warning colouration; Oophaga pumilio; Dendrobates pumilio; aggression; explorative behaviour; colour patterns; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Abstract : Evolutionary transitions between the two major predator avoidance strategies aposematism and crypsis are expected to be associated with changes in many important traits of animals. However, empirical studies on populations experiencing ongoing or recent transitions between these strategies are rare. READ MORE

  6. 4. Life at stake when playing hide and seek : Concealing effects of prey colouration and visual backgrounds

    Author : Marina Dimitrova; Merilaita Sami; Innes C. Cuthill; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; predation; adaptive prey coloration; camouflage; concealment; crypsis; background matching; disruptive colouration; distractive markings; Terrestrial ecology; Terrestrisk ekologi; zoologisk ekologi; Animal Ecology;

    Abstract : A prey animal can use different strategies to avoid becoming eaten by predators. One such widely recognised strategy is the use of body colouration to decrease the risk of becoming detected, i.e. cryptic colouration. READ MORE

  7. 5. Cryptic coloration, microhabitat choice and polymorphism in Idotea baltica (Isopoda)

    Author : Sami Merilaita; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; Animal Ecology; zooekologi;

    Abstract : In this thesis I have studied cryptic coloration, microhabitat use and colour polymorphism in the marine isopod Idotea baltica. In the Baltic Sea it lives and feeds mainly on the seaweed Fucus vesiculosus, which in sheltered sites usually is whitespotted on its lower parts due to epizoites. The white-spotted morph of I. READ MORE