SS4.07 Lipids/Fatty Acids in Ecological Research
Date: Tuesday, June 11, 2002
Location: Poster Session - VCC
 
PerssonJ, Dept. of Limnology, EBC, Uppsala University, Uppsala, Sweden, jonas.persson@ebc.uu.se
Vrede, T, , Dept. of Limnology, EBC, Uppsala University, Uppsala, Sweden, tobias.vrede@ebc.uu.se
Blomqvist, P, , Dept. of Limnology, EBC, Uppsala University, Uppsala, Sweden, peter.blomqvist@ebc.uu.se
 
BIOCHEMICAL AND ELEMENTAL FOOD QUALITY OF SESTON IN ENRICHED MESOCOSMS.
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In whole lake enrichments with the aim to stimulate fish production, itís crucial that organic material is efficiently transported through the food web, thus maximizing the fish yield from the added nutrients. In particular, the interactions between primary producers and herbivorous zooplankton are of great interest. Therefore, we need to know more about how zooplankton respond to changes in food quality associated with changes in the species composition and nutrient status of the phytoplankton community. As a part of a pilot study for a future whole lake fertilization experiment, a mesocosm experiment was performed to study changes induced by N and/or P enrichment in an ultra-oligotrophic sub-alpine reservoir. N (0, 40, or 80 microg/l) and P (0, 4, 8, or 12 microg/l) were added to the mesocosms using an unreplicated factorial design. The relationships between zooplankton growth rate (measured as biomass increment and RNA:DNA ratio) and different food quality parameters (fatty acids, amino acids, and particulate C, N, and P), and phytoplankton community composition and biomass, will be analysed using partial least square regression.