Search for dissertations about: "latitudinal gradient"

Showing result 11 - 15 of 33 swedish dissertations containing the words latitudinal gradient.

  2. 11. Tracing selection and adaptation along an environmental gradient in Populus tremula

    Author : David Hall; Pär Ingvarsson; Thomas Bataillon; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Local adaptation; Selection; genetic differentiation; QST; FST; Association study; frequency spectra; recurrent hitchhiking; selective sweep; Tree; Populus; natural selection; quantitative genetics; Terrestrial ecology; Terrestrisk ekologi; Population Biology; populationsbiologi; genetik; Genetics;

    Abstract : The distribution of the expressed genotype is moved around in the population over time byevolution. Natural selection is one of the forces that act on the phenotype to change the patterns ofnucleotide variation underlying those distributions. READ MORE

  4. 12. Physiological and Environmental Processes Influencing Growth Strategies in Amphibian Larvae

    Author : Emma Dahl; Anssi Laurila; Felicity Huntingford; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; growth; growth strategies; amphibians; latitudinal gradient; growth hormone GH ; corticosterone CORT ; breeding phenology; compensatory growth; compensatory strategies; Biology; Biologi; Biologi med inriktning mot populationsbiologi; Biology with specialization in Population Biology;

    Abstract : Cost and benefits of high individual growth rates are likely to vary across different environments leading to geographic differentiation in growth strategies. In ectotherms, habitats constrained by short growing seasons favour rapid growth and development leading to adaptive latitudinal clines in these traits. READ MORE

  5. 13. Atmospheric transport of persistent organic pollutants to aquatic ecosystems

    Author : Cecilia Agrell; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; Temperature; Latitude; Deposition; PCB; Baltic Sea; Ekologi;

    Abstract : The load of persistent organic pollutants (POPs) is considered high in the Baltic ecosystem. The Baltic Sea spans over 12 latitudes and the regional differences in climate affect the behavior of POPs. READ MORE

  6. 14. Population divergence at different spatial scales in a wide-spread amphibian

    Author : Patrik Rödin Mörch; Anssi Laurila; Jacob Höglund; Bengt Hansson; Uppsala universitet; []
    Keywords : Adaptive divergence; environmental gradients; genomics; life-history; amphibians; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Abstract : To study the distribution of genetic and phenotypic variation in different environments and at different spatial scales is important in order to understand the process of local adaptation and how populations will respond to future climate change. In my thesis I study populations of moor frogs (Rana arvalis) at different spatial scales, first along a 1700 km latitudinal gradient (Paper I, II, IV) and, second, in a system of inter-connected wetlands (III, IV). READ MORE

  7. 15. Temperature and the synchrony of plant-insect interactions

    Author : Tenna Toftegaard; Johan Ehrlén; Karl Gotthard; Christer Wiklund; Annette Menzel; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Brassicaceae; Anthocharis cardamines; climate change; development; oviposition; phenology; species interactions; herbivory; synchrony; timing; phenotypic plasticity; local adaptation; Plant Ecology; växtekologi;

    Abstract : Increasing temperatures resulting from climate change have within recent years been shown to advance phenological events in a large number of species worldwide. Species can differ in their response to increasing temperatures, and understanding the mechanisms that determine the response is therefore of great importance in order to understand and predict how a warming climate can influence both individual species, but also their interactions with each other and the environment. READ MORE