Search for dissertations about: "visual predators"
Showing result 1 - 5 of 8 swedish dissertations containing the words visual predators.
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1. Causes and consequences of niche differentiation between color morphs of pygmy grasshoppers
Abstract : In this thesis, I used the color polymorphic pygmy grasshopper, Tetrix subulata, as a model system in order to investigate the degree of niche differentiation between alternative color morphs that are present within a single population. First, I hypothesized that individuals belonging to different color morphs differ in their innate food preference due to somewhat dissimilar physiology, and in their actual food consumption due in part to differential habitat use. READ MORE
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2. Defence on Demand : A physiological perspective on phenotypic plasticity in anti-predator traits
Abstract : Almost all species face some degree of predation risk, and, hence, evolution has produced a plethora of anti-predator defences. However, anti-predator strategies require resources, and the prevailing risk of becoming prey is influenced by many factors and rarely constant across time and space. READ MORE
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3. Phenotypic Processes Triggered by Biological Invasions
Abstract : Individuals within a single population can vary widely in their phenotype e.g. in their body shape. These differences are an important source of biodiversity and they can precede evolutionary divergence within a population. READ MORE
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4. Piscivore-prey fish interactions - consequences of changing optical environment
Abstract : Predator-prey interactions are a primary structuring force in aquatic systems. A change in the predator-prey interactions may cause a change in the strength of trophic cascades and even resulting in ecosystem shifts. READ MORE
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5. 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