Search for dissertations about: "Phenology"

Showing result 11 - 15 of 66 swedish dissertations containing the word Phenology.

  2. 11. Thriving in extremes : Local adaptation of grasses (Poaceae) to geothermally heated soils on a subarctic island

    Author : Jan-Niklas Nuppenau; Aelys M. Humphreys; Catarina Rydin; Johan Ehrlén; Alessandro Chiarucci; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; abiotic stress; Agrostis; cold; colonization history; common garden; extreme environments; Festuca; frost; ice encasement; Iceland; heat; overwintering; phenology; plastome; snown; thermal tolerance; Plant Systematics; växtsystematik;

    Abstract : Temperature is one of the most decisive parameters when it comes to determining characteristics and distributions of life worldwide. For plants, as sessile organisms, it is particularly important to be able to deal with the temperatures they are exposed to at a given location. READ MORE

  4. 12. Wild bees in agricultural landscapes: Modelling land use and climate effects across space and time

    Author : Maria Blasi Romero; Centrum för miljö- och klimatvetenskap (CEC); []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Wild bees; Agricultural landscapes; climate change and agriculture; Phenology; Land-use; Model transferability; Ecological models; Pollination;

    Abstract : Wild bees are declining in many parts of the world, which poses a risk for crop pollination and ecosystem health. Land use and climate change are two of the main drivers of the decline, and understanding the interactive effects of these two drivers and wild bees is very important to be able to develop proper responses and mitigate future negative effects. READ MORE

  5. 13. Life History and Tolerance and Resistance against Herbivores in Natural Populations of Arabidopsis thaliana

    Author : Reiko Akiyama; Jon Ågren; Arjen Biere; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Arabidopsis thaliana; life history evolution; flowering time; germination; phenology; plant-herbivore interactions; natural selection; tolerance to leaf damage; resistance to herbivory; Plutella xylostella; Mamestra brassicae; Biology with specialization in Ecological Botany; Biologi med inriktning mot ekologisk botanik;

    Abstract : In this thesis, I combined observational studies with field and greenhouse experiments to examine selection on life history traits and variation in tolerance and resistance against herbivores in natural populations of the annual herb Arabidopsis thaliana in its native range. I investigated (1) phenotypic selection on flowering time and plant size, (2) the effects of timing of germination on plant fitness, (3) the effect of leaf damage on seed production, and (4) correlations between resistance against a specialist and a generalist insect herbivore. READ MORE

  6. 14. The role of microclimate for the performance and distribution of forest plants

    Author : C. Johan Dahlberg; Kristoffer Hylander; Johan Ehrlén; Jason D. Fridley; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; performance; microclimate; spatial scales; continental; landscape; distribution patterns; distribution limits; phenology; vegetative development; reproductive development; vital rates; population growth rate; vascular plants; bryophytes; distribution modelling; Plant Ecology; växtekologi;

    Abstract : Microclimatic gradients may have large influence on individual vital rates and population growth rates of species, and limit their distributions. Therefore, I focused on the influence of microclimate on individual performance and distribution of species. READ MORE

  7. 15. AVHRR NDVI for monitoring and mapping of vegetation and drought in East African environments

    Author : Lars Eklundh; Institutionen för naturgeografi och ekosystemvetenskap; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geologi; fysisk geografi; physical geography; Geology; phenology; seasonality; Fourier series; geostatistics; signal-to-noise ratio;

    Abstract : In this thesis, an assessment is made of the performance of the Normalized Difference Vegetation Index (NDVI) derived from coarse resolution data from the NOAA AVHRR sensor, with particular reference to mapping and monitoring of drought and vegetation in East African vegetation and climatic conditions. Methods for analysing time series of satellite data are investigated. READ MORE