SS3.05 Land-use, Groundwater and Lotic Ecosystems
Date: Monday, June 10, 2002
Time: 11:30:00 AM
Location: Colwood
 
LindOT, Baylor University, Waco, TX, USA, owen_lind@baylor.edu
Dávalos-Lind, L, O, Baylor University, Waco, TX, USA, laura_davalos-lind@baylor.edu
 
ALGAL GROWTH POTENTIAL AND LIMITING NUTRIENT LINKAGES WITH RIVER DISCHARGE AND LAND USE.
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The algal growth potential (AGP) of both Selenastrum capricornutum and native reservoir phytoplankton were correlated with river discharge. The algal growth response to added nitrogen had no relation to river discharge. However, response to added phosphorus was strongly correlated with discharge. This response was described by a power model. The phosphorus response was also related to AGP such that a phosphorus response occurred only when the AGP was low– which permitted the establishment of a critical threshold phosphorus concentration. From these analyses we were able to demonstrate the importance of non-point sources of phosphorus, primarily dairy farms, relative to domestic wastewater outfalls.