Sökning: "damselfly"

Visar resultat 1 - 5 av 8 avhandlingar innehållade ordet damselfly.

1. 1. Local adaptive pigmentation in Asellus aquaticus -effects of UV-radiation and predation regime

   Författare :Jonas Johansson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Marinbiologi; limnology; aquatic ecology; marine biology; Hydrobiology; Ekologi; Ecology; damselfly; perch; UV-avoidance; isopod; anti-predator traits; evolution; selective predation; limnologi; akvatisk ekologi; Animal ecology; Djurekologi;

   Sammanfattning : 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. LÄS MER

3. 2. Predator effects on behaviour and life-history of prey

   Författare :Tomas Brodin; Frank Johansson; Bradley Anholt; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; activity; behaviour; behavioural syndromes; damselfly; development; growth; life-history; predator-prey interaction; predation risk; thinning; Freshwater ecology; Limnisk ekologi;

   Sammanfattning : 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. LÄS MER

4. 3. The descent of damselflies and variation in relation to sex

   Författare :Beatriz Willink Castro; Evolutionär ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; sexual conflict; development; diversification; pleiotropy; correlational selection; damselfly;

   Sammanfattning : 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. LÄS MER

5. 4. Damsel in distress – metabolomics as a novel tool to investigate the effects of wastewater exposure on damselfly larvae

   Författare :Jana Späth; Malin L. Nording; Jerker Fick; Stina Jansson; Tuulia Hyötyläinen; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biomarkers; ecotoxicology; invertebrates; GC-MS; LC-MS; LC-MS MS; metabolomics; micropollutants; pharmaceuticals; risk assessment; ekotoxikologi; Ecotoxicology; Analytical Chemistry; analytisk kemi;

   Sammanfattning : 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. LÄS MER

7. 5. Ontogeny and Population Biology of a Sex-Limited Colour Polymorphism

   Författare :Jessica Abbott; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; embryologi; ontogeni; animal morphology; embryology; Utvecklingsbiologi; Damselflies; Colour polymorphism; Development; Frequency-dependence; Morphology; growth animal ; ontogeny; Animal anatomy; Development biology; Djurs anatomi och morfologi; Population divergence; Animal ecology; Djurekologi;

   Sammanfattning : 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. LÄS MER