Search for dissertations about: "lakes"

Showing result 6 - 10 of 367 swedish dissertations containing the word lakes.

2. 6. Food Quality for Zooplankton in Humic Lakes

   Author : Kelly Gutseit; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; limnology; Hydrobiology; marine biology; Clear water lakes; Plankton; Seston; Elements; Fatty acids; Humic lakes; Food quality; Zooplankton; limnologi; akvatisk ekologi; aquatic ecology; Marinbiologi;

   Abstract : Food quality affects growth, reproduction and community structure of zooplankton, and has implications for nutrient cycling and the transfer of energy and matter in aquatic food chains. While the issue of food quality in clear water lakes has received great recent attention, studies on food quality for zooplankton in humic lakes are scarce. READ MORE

4. 7. CO2 Emissions from Northern Lakes : Insights on regulation and spatiotemporal variability across contrasting lakes in Sweden

   Author : David Rudberg; David Bastviken; Paul Hanson; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lake; CO2 flux; Spatiotemporal variability; Empirical models; Sjö; Koldioxid-flöde; Rumsliga och tidsmässiga variationer; Empiriska modeller;

   Abstract : Lakes cover only ~2 % of the global land area, but their connections to the surrounding catchment make them important for the global carbon cycle. A considerable amount of the carbon input to lakes is emitted to the atmosphere as carbon dioxide (CO2) through diffusive flux. READ MORE

5. 8. Modelling impact climate-related change on the thermal responses of lakes

   Author : Ana I. Ayala; Donald C. Pierson; Stéphane Goyette; Andreas Lorke; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Modelling; climate change; lakes; thermal structure; surface heat fluxes; extreme events;

   Abstract : In response to climate-related changes, lakes worldwide have experienced warmer surface water temperatures, shorter ice cover periods and changes in lake stratification. As these aspects of lake dynamics exert substantial control over nutrient availability, oxygenation and biogeochemical cycling, predicting changes in lake water temperature and stratification dynamics can improve our understanding of the consequences of warming on lake ecosystems. READ MORE

6. 9. Greenhouse Gas Dynamics in Ice-covered Lakes Across Spatial and Temporal Scales

   Author : Blaize Amber Denfeld; Gesa Weyhenmeyer; Kimberly Wickland; Uppsala universitet; []
   Keywords : carbon cycle; climate change; cryosphere; carbon dioxide; methane; lakes; winter limnology; methane oxidation; nutrients; catchment; Limnologi; Limnology;

   Abstract : Lakes play a major role in the global carbon (C) cycle, despite making up a small area of earth’s surface. Lakes receive, transport and process sizable amounts of C, emitting a substantial amount of the greenhouse gases, carbon dioxide (CO2) and methane (CH4), into the atmosphere. READ MORE

7. 10. Solar radiation effects on decomposition and decomposers of plant litter in lakes

   Author : Måns Denward; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; glucosidase; photo inhibition; photo oxidation; littoral; lakes; ergosterol; fungi; phragmites; bacteria; UV-B; Hydrobiology; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi;

   Abstract : This thesis summarizes the results of a series of experiments, from test tube up to field study scale, performed to increase the understanding of solar radiation effects on decomposition and microbial decomposers of plant litter in stagnant water of littoral zones. In conclusion, I suggest that fungi play a significant role in the decomposition of plant litter submersed in lakes, and that their distribution is dependent on detritus quality and water chemistry, but also tends to be inversely related to the occurrence of bacteria attached to the litter. READ MORE