Sökning: "Abisko"

Visar resultat 1 - 5 av 77 uppsatser innehållade ordet Abisko.

1. 1. Trends in mountain birch seed abundance and its relation to temperature and moth abundance: a ten-year study from Swedish Lapland

   Kandidat-uppsats, Göteborgs universitet / Instiutionen för biologi och miljövetenskap

   Författare :Frida Gustafsson; [2023-02-09]
   Nyckelord :Betula pubescens; climate change; seed production; Epirrita autumnata; Operophtera brumata; subarctic ecology; folivory; larval abundance;

   Sammanfattning : Boreal forest is the world’s largest terrestrial biome. Being one of the most ubiquitous and coldtolerant tree species in Sweden, the mountain birch forms a unique deciduous treeline and marks the forest-tundra ecotone. LÄS MER

3. 2. Exploring the impact of Formica exsecta ants on soil properties above the tree line in northern Sweden

   Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Författare :Filip Pekkari Juto; [2023]
   Nyckelord :Formica exsecta; ant mounds; soil properties; organic matter content; tundra;

   Sammanfattning : Ants are considered ecosystem engineers due to their effect on the soil properties and their ability to alter the flow of energy and nutrients. Many studies have focused on ants in boreal forests,but few have focused on the ant’s effect on the tundra. LÄS MER

4. 3. Investigating surface spring snow : Changes in the isotopic composition and conductivity along an orographic precipitation gradient in northern Fennoscandia

   Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Författare :Sara Andersson; [2023]
   Nyckelord :stable isotopes; snow; precipitation; hydrology; orography; earth science;

   Sammanfattning : Stable isotopes of oxygen (O18) and hydrogen (H2) are used as proxies of past climates when ice preserved in the polar icecaps. The main assumption when doing paleoclimatic reconstructions using these isotopes is that the isotopic composition of the snow that turned into ice reflect the present temperature of the planet during deposition. LÄS MER

5. 4. Evaluation of the auroral large imagining system for automatic space debris detection

   Master-uppsats, Luleå tekniska universitet/Rymdteknik

   Författare :Pulmu Pietikäinen; [2023]
   Nyckelord :Space debris; optical system; auroral imager;

   Sammanfattning : The performance of the auroral large imagining system (ALIS_4D) and an automatic track detection algorithm was evaluated for space debris surveillance and tracking. The evaluation of the ALIS_4D was done through a numerical simulation and data annotations, while the track detection results were manually evaluated. LÄS MER

7. 5. Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting

   Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Författare :Franklin Lee Harris; [2023]
   Nyckelord :microbial ecology; soil; carbon dynamics; high latitudes; climate change; moisture stress; isotopes; respiration; trait based ecology; soil microbes; Environmental Changes in High Latitudes EnCHIL ; Earth and Environmental Sciences; Biology and Life Sciences;

   Sammanfattning : With warming in soils due to climate change, a series of secondary factors arise, which have multifaceted effects on soil microbial communities. Of these, alterations to soil moisture are among the most crucial to understanding how microbial functions will change in the face of climate change. LÄS MER