Search for dissertations about: "predator"
Showing result 1 - 5 of 191 swedish dissertations containing the word predator.
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1. Causes and consequences of individual variation in anti-predator traits
Abstract : Predation imposes a potent evolutionary force on prey, moulding the evolution of traits and diversification of species, and can furthermore have powerful ecological consequences. We know that different species vary in how they cope with their natural enemies, and, consequently, a huge range of anti-predator defences are displayed in nature. READ MORE
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2. The prey perspective - behaviour and appearance in a world of predators
Abstract : The varieties of prey phenotypes that have been revealed in nature are vast and many of these phenotypes are the result of the selective force that predators have had on prey traits in the past. Even within species and populations we see variations due to both differences in the selection forces they live under but also due to individual trait variation. READ MORE
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3. Predator-prey interactions in freshwater systems: The importance of chemical communication
Abstract : Predator released chemical cues provide a valuable source of information to prey organisms that can be used to alter their behaviour in order to reduce predation risk. In this thesis, I have examined under what circumstances chemical cues may be used by prey, and if prey discriminate between different cues. READ MORE
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4. 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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5. From behaviour to genes: anti-predator responses of brown trout (Salmo trutta) under winter conditions
Abstract : Temperature has major effects on the performance of poikilotherms. In encounters with predators, low winter temperatures constrain predator detection and escape capabilities in prey fishes. READ MORE