Sökning: "Historical ecology"

Visar resultat 6 - 10 av 98 avhandlingar innehållade orden Historical ecology.

1. 6. Bound to the past: Historical contingency in aquatic microbial metacommunities

   Författare :Máté Vass; Silke Langenheder; Steven Declerck; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metacommunity; historical processes; priority effects; community assembly.; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

   Sammanfattning : The composition of ecological communities differs due to a combination of different processes, which includes selection by local environmental conditions, dispersal from the regional species pool and random events. Additionally, historical processes such as past dispersal events may leave their imprint on communities as well, resulting in historically contingent communities. LÄS MER

3. 7. Nutrient cycling in agroecosystems: nitrogen cycling in southern Sweden in the 1850s and two Tanzanian villages in the 1990s

   Författare :Lars-Erik Williams; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nutrient; nutrient model; nutrient cycling; nitrogen fixation; nitrogen budget; mixed system; miombo; manure; livestock; land use; historical system; food production; efficiency; crops; agroecosystem; carrying capacity; phosphorus; Scania; sustainability; Plant ecology; Växtekologi;

   Sammanfattning : This study presents a general model for analysing nutrient cycling in agroecosystems. The focus is on food production intensity, human carrying capacity, sustainability and efficiency. The model can be used on systems including different kinds of land uses, which makes it applicable for studies on different scales. LÄS MER

4. 8. Metapopulation ecology of Osmoderma eremita - dispersal, habitat quality and habitat history

   Författare :Jonas Hedin; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; extinction debt; habitat history; habitat quality; pheromone; telemetry; capture-mark-recapture; metapopulation; dispersal; oak; Osmoderma eremita; beetle; Animal ecology; Djurekologi;

   Sammanfattning : This thesis starts with a review of different biodiversity assessment methods in forests and the rest deals with the metapopulation ecology of Osmoderma eremita, a threatened beetle living in hollow trees. I concentrate on the effect of dispersal, habitat quality and habitat history for the presence, population size and future survival of this species. LÄS MER

5. 9. Distribution patterns of fleshy-fruited woody plants at local and regional scales

   Författare :Matilda Arnell; Ove Eriksson; Johan Ehrlén; Sara A.O. Cousins; Angela Moles; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fleshy fruits; woody plants; dispersal; distribution patterns; range filling; dispersal limitation; historical land use; spatial associations; point-pattern analysis; recruitment; reproduction; pollination; fruit set; fruit-removal; Daphne mezereum; Plant Ecology; växtekologi;

   Sammanfattning : Fleshy-fruited woody plants share a long history with humans, providing us with food and wood material. Because of this relation, we have actively moved some of these plants across landscapes and continents. LÄS MER

7. 10. Wolverine ecology and conservation in the Western United States

   Författare :Robert Michael Inman; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Successful conservation of rare species requires an understanding of the niche, knowledge of the scale over which a viable population exists, and a system that provides adequate funding to take the necessary actions. I radio-marked wolverines in the Yellowstone Ecosystem and examined spatial ecology and reproductive chronology from an evolutionary perspective to better define the wolverine niche. LÄS MER