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Phosphorus Limitation on Periphyton a Study of Three Baltimore County Streams Phytobenthos (algal periphyton) www.lfu.bayern.de//pic/phytobenthos_gr.jpg Phosphorus Limitation on Periphyton A Study of Three Baltimore County Streams May 2008 Prepared by: Teresa Bartley Undergraduate Student Environmental Science and Studies Dr. Susan Gresens Associate Professor Department of Biological Sciences Towson University Towson, MD 21252 USA Introduction The.