Bentzen, E. Trent University, ebentzen@trentu.ca
Lean, D. University of Ottawa, dlean@oreo.uottawa.ca
Taylor, W. D.. University of Waterloo, wdtaylor@sciborg.uwaterloo.ca
Hickie, B. Trent University, bhickie@trentu.ca

 
RELATIONSHIP BETWEEN ZOOPLANKTON LIPID IN LAKES OF CONTRASTING FOOD WEB STRUCTURE AND LAKE NUTRIENT STATUS
 
We examined variation in zooplankton percent lipid relative to nutrient status of lakes with contrasting food webs. Understanding factors behind variability in lipid is important for study of energy storage in food webs as related to food quality and ecotoxicological studies because organic contaminants are stored in lipid. From 1992 to 1994, we sampled a number of oligo- to mesotrophic lakes belonging to one of three food web types which varied in zooplankton biomass. In 1992, we examined for differences in algal nutritional quality (protein, carbohydrate and lipid) and nutrient limitation among the three food web types and their relationship to zooplankton lipid. Zooplankton lipid did not vary among the food webs but was moderately and positively related to indices of nutrient limitation such as P turnover time but not to chemical indices such as C:P ratios. However, in 1993 and 1994 zooplankton lipid was significantly higher for lakes of reduced zooplankton biomass from mysid grazing and significantly higher for more productive lakes characterized by lower particulate C:P and higher total phosphorus despite similar chlorophylla concentrations. Zooplankton lipid was higher relative to 1992 and we suggest the 1992 data were moderated by it being a cool, wet summer.
 
Day: Tuesday, Feb. 2
Time: 04:15 - 04:30pm
Location: Sweeney Center
 
Code: SS49TU0415S