Sökning: "human ecology"

Visar resultat 6 - 10 av 290 avhandlingar innehållade orden human ecology.

1. 6. Epidemiology and population structure of Campylobacter jejuni and related organisms in wild birds

   Författare :Jonas Waldenström; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; epidemiology; Campylobacter lari; population structure; Helicobacter canadensis; Ecology; Parasitology human and animal ; Animal ecology; Djurekologi; Parasitologi människa och djur ; migration; Ekologi; wild birds; Sweden; Campylobacter jejuni;

   Sammanfattning : Campylobacter jejuni is one of the most common causes to bacterial gastroenteritis in the industrialised world. Also other species of the Campylobacter genus give rise to human infections. C. jejuni occurs in many different animal hosts and can be isolated from water sources. LÄS MER

3. 7. Plumage Colours and the Eye of the Beholder : The Ecology of Colour and its Perception in Birds

   Författare :Olle Håstad; Mats Björklund; Innes Cuthill; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; ultraviolet; colour vision; opsin; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

   Sammanfattning : Virtually all diurnal birds have tetrachomatic vision based on four different colour receptors. As a result, birds are potentially able to perceive their environment in twice as many colours as humans and four times as many colours compared to most other mammals, which are dichromatic. LÄS MER

4. 8. Interactions between climate, natural disturbances, and regeneration in boreal and hemi-boreal forests

   Författare :Igor Drobyshev; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; conservation strategies; Plant ecology; Växtekologi; taiga; seasonal climate; shoot increment; larch; reconstruction; human; canopy gap; fire history; boreal; natural disturbances; dendrochronology;

   Sammanfattning : Natural disturbance is an important driving force of community dynamics in many forest types around the globe. Understanding spatial and temporal properties of disturbance events in the present and in the past is important in formulating the nature conservation strategies as well as for the modeling of climate and human impacts on forest vegetation. LÄS MER

5. 9. Relationship between wildlife and tourism - interdisciplinary insights from Arctic fox tourism in Sweden

   Författare :Malin Larm; Anders Angerbjörn; Barbara Zimmermann; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; wildlife tourism; human disturbance; human-wildlife interaction; conservation; predation; arctic fox; zoologisk ekologi; Animal Ecology;

   Sammanfattning : Interactions between wildlife and tourism can be studied from several different perspectives and the effects of such interactions can influence animals both positively and negatively with effects on both individual and population levels. This thesis takes an interdisciplinary approach, combining both natural and social perspectives, when studying the effects of tourism activity on a small population of the endangered arctic fox (Vulpes lagopus). LÄS MER

7. 10. Seed mobility and connectivity in changing rural landscapes

   Författare :Alistair G. Auffret; Sara Cousins; Robin Pakeman; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Biodiversity; Conservation; Functional connectivity; Historical ecology; Human-mediated dispersal; Invasive species; Landscape Ecology; Long-distance dispersal; Restoration; Seed bank; Seed dispersal; Seed rain; Structural connectivity; Physical Geography; naturgeografi;

   Sammanfattning : The success or failure of many organisms to respond to the challenges of habitat destruction and a warming climate lies in the ability of plant species to disperse between isolated habitats or to migrate to new ranges. European semi-natural grasslands represent one of the world's most species-rich habitats at small scales, but agricultural intensification during the 20th century has meant that many plant species are left only on small fragments of former habitat. LÄS MER