Sökning: "dispersal limitations"
Hittade 4 uppsatser innehållade orden dispersal limitations.
1. Spridningsbegränsningar för sik (Coregonus lavaretus) : En GIS-baserad studie
Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskapSammanfattning : An important question in determining species composition in a lake is what species has had the chance to reach the lake in the first place. The aim of this study was to examine natural stream connectivity limitations for whitefish (Coregonus lavaretus) between lakes, and to contribute to the development and evaluation of GIS-based methods to answer this question. LÄS MER
2. Land reclamation by reindeer lichens : On the complexity of substrate and reindeer grazing on Cladonia spp. dispersal
Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskapSammanfattning : Reindeer lichens are on a dramatic decline in Sweden, with a 71 % decrease in abundance over the last 60 years. Reindeer (Rangifer tarandus tarandus L.) management, undertaken by indigenous Sámi people, depend upon extensive winter grazing grounds with abundant reindeer lichen cover. LÄS MER
3. Tillväxt, överlevnad och skador för provenienser av Banksianatall (Pinus banksiana, Lamb.) i norra Sverige
Master-uppsats, SLU/Dept. of Forest Ecology and ManagementSammanfattning : Främmande trädslag har i modern tid intresserat skogsbruket i sin jakt på ökad produktion, minskad känslighet för skador, förbättrad anpassning med mera. Ett tidigare oprövat trädslag var banksianatallen (Pinus banksiana, Lamb. LÄS MER
4. The effect of landscape structure on distribution and abundance of Lobaria Pulmonaria
Kandidat-uppsats, Institutionen för kultur, energi och miljöSammanfattning : The objective of the current study was to analyse the effect of landscape structure (habitat size and exposure to farmland) on the occurrence and abundance of Lobaria pulmonaria, a foliose cyanolichen. Since the agrarian revolution during the 19th century the agricultural landscape has become increasingly fragmented resulting in isolated meadows and wood-pastures surrounded by farmland. LÄS MER