Biogeochemistry-5 Andrea_algaeN_SOS4244

Biogeochemistry-5 Andrea_algaeN_SOS4244 - Nitrogen Dynamics...

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1 Nitrogen Dynamics in Florida Springs and Relationships to Algal Blooms Andrea Andrea Albertin Albertin Katz et al. 1999 Karst Topography and Springs Confined Unconfined Madison Blue Alexander Weeki Wachee Little River
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2 Fanning Little Fanning Silver Glen Increase in Macroalgae Problems with Algal Mats Can out-compete aquatic vegetation - Reduced light • Aesthetics Can cause allergies: “Swimmer’s Itch”
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3 Weeki Wachee Springs Early 1950’s 2001 2001 2006 Lyngbya wollei Vaucheria sp. Spirogyra sp. Spirogyra sp. Oscillatoria sp.
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4 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1950 1963 1977 1991 2004 Concentration mg/L Silver Springs (1950-2004) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1970 1983 1997 Concentration mg/L Weeki Wachee Springs (1970-2000) Increase in Nitrate Levels USGS, A. Pinowska NO 3 -N PO 4 -P NO 3 -N PO 4 -P Is the increase in algal biomass a direct consequence of increased nitrate levels in the Floridan Aquifer? Florida Springs Initiative (2001) FDEP – Michigan State University (2002-2004) - Is there a direct relationship between algae and water N and P? - Field surveys and laboratory studies Addressing the Problem
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5 Major Findings Macroalgae at all sites (28 springs) Lyngbya wollei and Vaucheria sp. most common species No clear relationships between N and P of
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