Sökning: "marginal population"
Visar resultat 1 - 5 av 108 avhandlingar innehållade orden marginal population.
1. Population biology of the clonal plant Ranunculus lingua
Sammanfattning : The scope of this thesis was to identify, describe and quantify important life-history traits for the pseudoannual aquatic plant Ranunculus lingua in different ecological settings, by comparing populations from geographically marginal vs. central habitats. LÄS MER
2. Population size, viability and genetic diversity in the orchid Gymnadenia conopsea
Sammanfattning : In this thesis, I combined controlled crosses with genetic and demographic data to examine how a main conservation value indicator, population size, was associated with estimates of population viability. I focused on the still common, but decreasing, perennial orchid Gymnadenia conopsea at two spatial scales—locally on the island Öland, in SE Sweden, and regionally across Scandinavia. LÄS MER
3. Carbon Dynamics in Northern Marginal Seas
Sammanfattning : The marginal seas have, despite their relatively small area, an important role in the global carbon cycle. They are largely influenced by carbon and nutrient fluxes from land and a large part of the biological production occurs in the marginal seas. LÄS MER
4. Health and well-being in the elderley : A prospective population- based study
Sammanfattning : The Albertina Project is an epidemiological study of the social, medical, economic and mortality situation among 9440 people, 75 years or older, living in the city of Uppsala, Sweden. Most people lived in their own home. The housing standard appeared to be satisfactory in the majority of cases. LÄS MER
5. Evolutionary ecology of arctic char (Salvelinus alpinus (L.)) : Intra- and interspecific interactions in circumpolar populations
Sammanfattning : This thesis examines a suite of ecological and genetic mechanisms influencing the fundamental and realized niche borders of European and North American populations of the Arctic char (Salvelinus alpinus (L.)) species complex in allopatry as well as in sympatry with brown trout (Salmo trutta) or brook trout (Salvelinus fontinalis). LÄS MER