CS08 Biogeochemical Cycles
Date: Monday, June 10, 2002
Time: 11:15:00 AM
Location: Saanich
 
DaviesJM, NSERC/IRC Environmental Management of Drinking Water Lab., University of Victoria, Victoria, Canada, jmdavies@uvic.ca
Nowlin, W, H, NSERC/IRC Environmental Management of Drinking Water Lab., University of Victoria, Victoria, Canada, wnowlin@uvic.ca
Mazumder, A, M, NSERC/IRC Environmental Management of Drinking Water Lab., University of Victoria, Victoria, Canada, mazumder@uvic.ca
 
PHYTOPLANKTON NUTRIENT STATUS: IMPLICATIONS OF PLANKTON SIZE
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Growth of phytoplankton and success of individual species is conditional on both external conditions and individual physiologies. Identifying the nutrient status of phytoplankton is important for understanding their community composition. Nutrient limitation can be evaluated at different time scales and different plankton size classes. The current study used nutrient debt assays and nutrient ratios (P-debt, N-debt, dark NH4+ enhanced 14C-uptake, TN:TP) to examine the proximate nutrient deficiency of different size classes of plankton in coastal British Columbia (Canada) lakes and reservoirs. Persistent indictors of both phosphorus and nitrogen deficiency were found in several of our reservoirs and lakes. Different nutrient assays are suggestive of conflicting nutrient deficiencies. Reconciliation of these differences will be discussed in relation to plankton size and seasonality.