Search for dissertations about: "damselfly"
Showing result 1 - 5 of 8 swedish dissertations containing the word damselfly.
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1. Local adaptive pigmentation in Asellus aquaticus -effects of UV-radiation and predation regime
Abstract : Pigmentation in the freshwater isopod Asellus aquaticus differed between two habitats. Asellus were lighter pigmented in stands of submerged stonewort vegetation, than in nearby reed stands. Moreover, Asellus pigmentation became lighter with time in recently established stonewort stands. READ MORE
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2. Predator effects on behaviour and life-history of prey
Abstract : In this thesis I investigate predator-induced effects on behavioural and life-history characteristics of prey. At any moment a given predator is capable of attacking a small number of prey. READ MORE
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3. The descent of damselflies and variation in relation to sex
Abstract : Sexual conflict over mating shapes the interactions between males and females in many animals and is also responsible for dramatic adaptations in both sexes. In some species of pond damselflies (Odonata:Coeangrionidae), sexual conflict maintains discrete female-limited colour morphs over multiple generations and within populations. READ MORE
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4. Damsel in distress – metabolomics as a novel tool to investigate the effects of wastewater exposure on damselfly larvae
Abstract : Aquatic organisms, such as aquatic invertebrates, are exposed to anthropogenic pollutants through their environment. These pollutants, despite their low levels, can adversely affect exposed individuals or even entire ecosystems, especially when present in complex mixtures. READ MORE
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5. Ontogeny and Population Biology of a Sex-Limited Colour Polymorphism
Abstract : This study has involved investigation of number of populations of the damselfly Ischnura elegans over several years, looking at frequency changes over time, morphological differences between the sexes and the morphs, differences in growth rate and development time, differences in fecundity between the morphs, and genetic differentiation between populations. I. READ MORE