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This thesis, written by Megan L. Fork, and entitled Direct and Indirect Effects of Organic Matter Sources on Denitrificaton in Florida Rivers, having been approved in respect to style and intellectual content, is referred to you for judgment. We have read this thesis and recommend that it be approved. and Nate Lemoine for patiently helping me apply the correct statistical analyses to my data, and to the members of the Seagrass Lab and Heffernan Lab for giving me valuable feedback on drafts of this manuscript. To our lab manager, Lawrence Lopez, thanks for helping things run smoothly and safely. I further thank the SERC Nutrient Analysis Laboratory for running my water samples, and to Dr. Bill Anderson and Dr. Todd Kana for support with the MIMS. Permits for access to state and federal lands used as field sites were awarded to me by the I owe a debt of gratitude to my committee members Dr. Jenny Richards and Dr. Joe Boyer for their patience, guidance, and insightful questions during my research and writing. To Dr. Jim Fourqurean, my major professor, thank you for steering me straight and making sure my thinking did not occur only within the box of freshwater ecosystems. And finally, I wish to thank Dr. Jim Heffernan, my advisor during the majority of my master's work, who patiently tolerates even the silliest of questions with grace, who iv taught me how to use creativity in science, and without whom I would have lost my way countless times. Thank you for everything. Thank you to my friends both in Miami and scattered across the globe for making sure I remained sane and as socially competent as any science nerd could be, and to my brother and parents for their love, support, and care packages throughout my career. I also wish to thank Aldo, with loving memory, for the years of warmth and fuzziness he brought to my life. And finally, thank you to my wonderful husband, Ewan Isherwood, for being only minimally annoyed by my working during early mornings and late nights, and for steadfastly believing in and supporting me, especially when I could not. Denitrification removes large amounts of reactive nitrogen (N) from ecosystems via reduction of nitrate to dinitrogen gas. In aquatic ecosystems, the influences of terrestrial and aquatic sources of organic matter (OM) on denitrification are potentially complex. Terrestrially-derived OM is often less labile than …