Browsing Doctoral Theses / Doktorsavhandlingar Institutionen för biologi och miljövetenskap by Title
Now showing items 72-91 of 109
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Parasite host interaction between the freshwater pearl mussel (Margaritifera margaritifera) and brown trout (Salmo trutta) – the impact from glochidia larvae on the host
(2022-02-17)Parasites can modulate the physiology and behavior of the hosts to enhance their chances to complete their life cycle. The numerous freshwater bivalves of the order Unionoida all have a parasitic larval stage, also known ... -
Paternal care and brood reduction in a pipefish
(2012-11-01)From an evolutionary and adaptive perspective, the occurrence and extent of parental care in animals (investment in offspring beyond the genetic contribution) is expected to depend on an optimal (fitness-maximizing) balance ... -
Patterns of evolution in a young species, the Baltic seaweed Fucus radicans
(2015-04-29)To be able to interpret patterns of biodiversity it is important to understand the processes by which new species evolve and how closely related species remain reproductively isolated and ecologically differentiated. This ... -
Phenotypic Plasticity and Adaptation Potential to Salinity in Early Life Stages of the Tunicate, Ciona intestinalis spB
(2014-04-08)Species respond to environmental heterogeneity through a variety of mechanisms such as plasticity, genetic adaptation and phenotypic buffering. Determining how gene flow, scale of environmental heterogeneity and trait ... -
Phylogenetic Inference and Allopolyploid Speciation - A Study of Silene section Physolychnis
(2012-08-31)The major theme of this thesis is allopolyploidization, with focus on Silene section Physolychnis. The evolutionary history of an allopolyploid species can be established by inferring the sister relationships of the ... -
Phylogenetic Relationships, Biogeography and Species Delimitation: A case study on southern African Silene (Caryophyllaceae)
(2023-09-20)The primary aim of this thesis was to explore the phylogenetic relationships and historical biogeography of African members of the plant genus Silene (Caryophyllaceae), with special focus on the eight native southern African ... -
Plant Oxylipins and Lipid Transfer Proteins in Defense
(2017-10-20)Oxylipins, the oxygenated metabolites of polyunsaturated fatty acids (PUFAs), are found in many eukaryotic organisms. In plants, several enzymes can produce different types of oxylipins, and the chloroplast structural ... -
Plant pathogen defense: Signalling, resistance and cell death
(2015-03-31)Pathogenic microorganisms are present everywhere in nature and infect both animals and plants. Phytopathogenic microorganisms cause diseases on plants, and are responsible for crop loss amounting in the order billions of ... -
Plant Species Composition and Diversity in Cliff and Mountain Ecosystems
(2012-09-12)Ecosystems today are under increasing pressure from a rapidly changing climate, changes in land-use, habitat fragmentation and degradation and increasing anthropogenic disturbance. Studying drivers of biodiversity patterns ... -
Plastidial phosphate transport in plants
(2014-10-24)Phosphorus is an essential element for all living organisms and is central to the genetics and energetics of life. Inorganic phosphate (Pi) is recurrently involved in protein regulation and signal transduction but also in ... -
Polyploid Phylogenetics in Plants: Insights on non-model organisms in Fabaceae and Malvaceae
(2019-05-02)Genome duplication is a common phenomenon in angiosperms and advances in sequencing technologies and bioinformatics is now revealing its prevalence and significance. In a polyploidization event all genes in a genome are ... -
Reproductive traits in euryhaline gobies: insights into physiology, adaptations and biological invasions
(2020-03-24)Organisms are adapted to reproduce in their specific environment by a range of different traits. For many animals, reproduction is tied to specific conditions, that trigger or enable the reproductive events. This thesis ... -
Responses of shallow sediment ecosystems to environmental alterations
(2013-02-14)Shallow-water sediment systems are continuously exposed to a range of anthropogenic stressors, including increased nutrient loading, physical disturbance and toxicants. Superimposed on these local stressors are stressors ... -
Risk assessment of chemical mixtures in the aquatic environment
(2017-04-26)The total chemical production within the European Union amounts to more than 300 million tonnes per year, of which 140 million tonnes are considered as hazardous to the environment. In order to ensure that these chemicals ... -
Role of mycorrhiza symbiosis and phosphorus nutrition in plant growth, photosynthesis and secondary metabolism
(2016-09-30)Inorganic phosphorus (Pi) is an important and often limiting nutrient for plants. Large amounts of Pi fertilizers derived from non-renewable rock phosphorus, are used in agriculture. These are applied in excess but crops ... -
Scale-worm Systematics (Annelida, Polychaeta)
(2013-02-07)Paper I. Scale-worms are segmented worms. They can be found in all marine benthic habitats, including about 1200 species and over 200 genera. There has been little known about the phylogeny of this group and this study is ... -
Seaweed Invasions and Novel Chemical Defences
(2012-11-08)Biological invasions pose a risk to the biodiversity and the functioning of ecosystems in invaded areas. The reasons why some introduced species become dominant and widespread in their new environments is still largely an ... -
Sexual signalling and noise pollution - implications for courtship behaviour and reproductive success in two vocal species of marine gobies
(2017-08-24)Many marine animals use acoustic signals to mediate social interactions. Acoustic cues and signals are especially important in water because sound is unique as a sensory modality propagating with little attenuation over ... -
Shipworm ecology in Swedish coastal waters
(2015-03-11)Shipworms (Teredinidae) are marine bivalves adopted for boring into submerged wood, which they efficiently fragmentize and consume. They thereby perform a vital ecosystem service, yet simultaneously they cause extensive ... -
Skötsel av ekblandskogar: naturvårdsgallring och respons hos träd och buskar
(2015-09-24)Det senaste århundradet har skogsbruket intensifierats med storskaliga skogsplanteringar, speciellt gran, och brukande genom kalhyggen. Detta har inneburit en homogenisering av landskapet och många naturtyper har gått ...