Search for dissertations about: "crypsis"
Showing result 1 - 5 of 6 swedish dissertations containing the word crypsis.
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1. On the origin of polymorphism - consequences of competition and predation in heterogeneous environments
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
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2. Antipredator defence in butterflies
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
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3. Aposematism, Crypsis and Population Differentiation in the Strawberry Poison Frog
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
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4. Life at stake when playing hide and seek : Concealing effects of prey colouration and visual backgrounds
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
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5. Cryptic coloration, microhabitat choice and polymorphism in Idotea baltica (Isopoda)
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