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International cooperative research program (field work in 1992-1996) on Bewick's Swans, on ecological limitations in the annual cycle, mainly during periods of high energy expenditure, i.e. breeding and migration. Relates to feeding ecology (both terrestrial and aquatic (pondweed tubers) vegetation, annual variation in climatic conditions. Aims at: 1. understanding limiting factors for population size (production of young and survival) 2. understanding migratory behaviour in this large species 3. protecting crucial areas for breeding, moulting and migrating for this vulnerable swan population Research activities: - Field expeditions (2-5 months) to the Arctic, covering the entire breeding season, including moult and pre-migratory fattening - Running a ringing project with over 1,000 individually marked birds - Data analysis and publications
The aim of this international project is to measure and model arctic UV-radiation and assess the effects on freshwater planktonic organisms and foodwebs. The fieldwork and experiments are conducted at Ny-Alesund, Spitsbergen. The specific aim of our participation is to study the food web effects of UV-B stress by means of in-situ enclosure studies. In the laboratory we found that UV-B stressed algal cells may increase in volume and form a thicker cell wall. These changes in the algal cells may reduce their digestibility by zooplankton. Further the role of photopigments (like melanin and carotenoids), present in some zooplankters, will be studied in relation to the survival of these animals at high UV-B exposure. Research activities Grazing experiments with Daphnia pulex (melanic and hyaline) are performed in in-situ enclosures (under different UV exposures) in the Brandal Lagune during July. The green alga Chlamydomonas will be incubated in-situ under different UV exposures to assess the potential use of this alga as a biodosimeter for UV-B. Further the survival of melanic and hyaline daphnids will be tested in-situ.