Sources of Excess Phosphate Leading to Cyanobacteria
SOURCES OF EXCESS PHOSPHATE LEADING TO CYANOBACTERIA BLOOMS AT LAKE TEMESCAL, OAKLAND, CA. A University Thesis Presented to the Faculty of California State University, East Bay In Partial Fulfillment of the Requirements for the Degree Master of Science in Geology By Faithe Lovelace March, 2017 Acknowledgements I would like to thank Dr. Jean Moran for the countless hours she put into this project, without your insight this project would not be possible. Thank you, Dr. Michael Massey, for your help and data. Thank you, Pamela, Beitz and all East Bay Regional Park District for presenting the project and the continuous support, suggestions, and funding for the project. Thank you, Glenn, Carr for your help in the field and all the support your provided. I would like also like to thank my parents Michael and Mary Catherine for their unwavering belief and support. ii Abstract Lake Temescal is a dammed sag pond formed as a result of long-term creep along the Hayward Fault. It is a popular swimming, hiking, and fishing spot within the East Bay Regional Parks District (EBRPD). Over the past decade, the lake has experienced numerous cyanobacteria (commonly known as “blue green algae”) blooms and high 3- phosphate (PO4 ) concentrations have been implicated in the blooms, as phosphate is a typically a limiting nutrient. Further water Quality, and water chemistry testing, collected over 16 months (November, 2015 – March, 2016), provided insight into sources and cycling of phosphate in the lake and its watershed. Advanced analyses such as the ratio of total nitrogen to total phosphorous (TN:TP), X-ray absorption spectra (XAS) of lake bottom sediments, and d18O of phosphate were applied as tracers of phosphate source and cycling.
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