Search for dissertations about: "aquatic communities"

Showing result 16 - 20 of 95 swedish dissertations containing the words aquatic communities.

2. 16. An exploration of freshwater microbial ecology : from streamlined genera to global networks

   Author : Rhiannon Mondav; Stefan Bertilsson; Phyllis Lam; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; microbiology; ecology; networks; streamlined; aquatic; Biology with specialization in Limnology; Biologi med inriktning mot limnologi;

   Abstract : Microbes are the main drivers of biogeochemical cycles on Earth and even though freshwaters cover only a small area of terrestrial surfaces their contribution to global cycles is important. Global cycles are measured by exchanges between systems e.g. water to atmosphere or lithosphere and are mediated by microbial communities. READ MORE

4. 17. Direct and indirect effects of fish predation and excretion in aquatic food webs

   Author : José Luiz Attayde; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; marine biology; Hydrobiology; zooplankton; resilience; predation; phytoplankton; nutrient enrichment; nutrient recycling; interaction strength; herbivory; food webs; food chain; excretion; fish; detritus; detritivory; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi; Ecology; Ekologi;

   Abstract : The aim of this thesis was to elucidate the mechanisms by which planktivorous fish can affect planktonic communities in lakes and how they may affect benthic communities through their effects on planktonic communities. In a laboratory experiment, nutrients released by fish increased algal biomass and altered phytoplankton community structure, suggesting that fish can affect phytoplankton by directly releasing nutrients. READ MORE

5. 18. Attached Bacterial Communities in Lakes – Habitat-Specific Differences

   Author : Ann-Louise Haglund; Lars Tranvik; Helmut Fischer; Bengt Boström; Erik Törnblom; Paul del Giorgio; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; bacteria; freshwater; sediment; epiphyton; bacterioplankton; metabolically active; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

   Abstract : For many years, the importance of microorganisms attached to surfaces in littoral zones and wetlands has been disregarded when describing aquatic ecosystem dynamics. Supporting evidence is scarce but convincing that these microbial communities are not only very productive but can often serve as major regulators of nutrient and carbon dynamics in many freshwaters. READ MORE

6. 19. Towards aquatic assessment of Lake Tumba, DR Congo

   Author : Lingopa Norbert Zanga; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Abstract : The livelihoods of most communities around the 765 km2 Lake Tumba are dependent on fish from the lake. Artisanal fishing and other pressures on the aquatic ecosystem are likely to have increased over the last half century. However, few monitoring programs follow these pressures and their influence on the aquatic ecosystem. READ MORE

7. 20. Bacterial Degradation and Use of Chitin in Aquatic Habitats

   Author : Sara Beier; Stefan Bertilsson; Ian Head; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chitin; organic matter degradation; microbial ecology; functional guild; Biology; Biologi;

   Abstract : Chitin belongs to the most abundant biopolymers on earth where it has an important role as a structural element in crustaceans, insects, fungi and some phytoplankton. Missing evidence for long-term accumulation of chitin in nature implies fast turnover and as chitin is composed of aminosugar subunits it holds central roles in both carbon and nitrogen cycles. READ MORE