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Habitat Preferences of Adult Spotted Seatrout, Cynoscion Nebulosus, In Louisiana State University LSU Digital Commons LSU Master's Theses Graduate School 2015 Habitat Preferences of Adult Spotted Seatrout, Cynoscion nebulosus, in Lake Pontchartrain, Louisiana Noelle Marie Bramer Louisiana State University and Agricultural and Mechanical College, [email protected] Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_theses Part of the Oceanography and Atmospheric Sciences and Meteorology Commons Recommended Citation Bramer, Noelle Marie, "Habitat Preferences of Adult Spotted Seatrout, Cynoscion nebulosus, in Lake Pontchartrain, Louisiana" (2015). LSU Master's Theses. 3457. https://digitalcommons.lsu.edu/gradschool_theses/3457 This Thesis is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Master's Theses by an authorized graduate school editor of LSU Digital Commons. For more information, please contact [email protected]. HABITAT PREFERENCES OF ADULT SPOTTED SEATROUT, CYNOSCION NEBULOSUS, IN LAKE PONTCHARTRAIN, LOUISIANA A Thesis Submitted to the Graduate Faculty of the Louisiana State University and Agricultural and Mechanical College in partial fulfillment of the requirements for the degree of Master of Science in The Department of Oceanography and Coastal Sciences by Noelle Marie Bramer B.S., University of Vermont, 2011 December 2015 This work is dedicated to my mother, father, sister, brother, and husband-to-be. Each has helped me find my joy in science. From the sands of Cape Cod to the shores I have yet to see, my family has been and always will be there to encourage my love of the sea and support my ambitions to explore it. With the love of my sweetheart, I know I will have the best company to share the views and the patience to tackle the science to fully appreciate them. Thank you. ii ACKNOWLEDGEMENTS First and foremost, I would offer my sincerest thanks to my advisor, Dr. James Cowan, Jr. for his encouragement, enthusiasm, and passion for Louisiana’s fisheries. With his guidance, I grew immeasurably as a scientist, but most especially in my critical thinking skills. My future in oceanography will be the better for every bit of advice he has given me. I also thank my committee members, Dr. Sibel Bargu Ates and Dr. Sam Bentley, for their valuable advice and encouragement in my thesis research. I would like to express my heartfelt gratitude to David Nieland for his patience and humor in tackling this project. In addition, I owe a great deal of thanks to Gary Peterson for every boat ride across Lake Pontchartrain and for the best partner in overcoming every complication nature, man, or machine could throw our way. I would like to thank Thomas Blanchard for the compassionate and calm instruction of this graduate student in all water chemistry matters. For everything ArcGIS related, my sincere thanks goes out to Hampton Peele. For their help, support, and funding for this research initiative, I would like to thank the Louisiana Department of Wildlife and Fisheries as well as the Louisiana Artificial Reef Program. I would also like to extend my thanks to the Lake Pontchartrain Basin Foundation for their invaluable help in understanding Lake Pontchartrain and for their dedication to its health. I would like to thank every lab mate for taking the time to help me bounce around ideas, reminding me to take time to breathe, enjoy the process of learning with friends, find new viewpoints on my research, and have a real sense of community at LSU. I would especially like to thank Ashley Melancon and Jackie McCool for their energy and partnership. I would like to thank my family for nurturing my inner scientist with trips to the Boston Aquarium, whale watching, Blue Planet marathons, family trips to the iii beach every summer, and so much more. Lastly, I’d like to thank my fiancé Nick for being the patient, kind, and caring support I needed to bring my spirits up and my typing fingers down. I cannot wait to celebrate our lives together! I am grateful to every person I have had the pleasure to meet along this journey and am so happy to have worked with this many talented people. My sincerest thanks go out to all of you. iv TABLE OF CONTENTS ACKNOWLEDGEMENTS ............................................................................................... iii ABSTRACT ..................................................................................................................... viii CHAPTER 1: GENERAL INTRODUCTION ................................................................... 1 FISHERIES AND SUPPORTING ESTUARIES ........................................................... 1 SPOTTED SEATROUT ................................................................................................. 2 STUDY OUTLINE ......................................................................................................... 4 LITERATURE CITED ................................................................................................... 4 CHAPTER 2: HABITAT USE OF ADULT SPOTTED SEATROUT IN RELATION TO BOTTOM TYPE WITHIN LAKE PONTCHARTRAIN, LOUISIANA .................... 7 INTRODUCTION ........................................................................................................... 7 METHODS .................................................................................................................... 12 Study Area ................................................................................................................. 12 Telemetry ................................................................................................................... 12 Monthly Hot Spot Analysis ....................................................................................... 14 Bottom Habitat Characterization Surveys ................................................................. 17 RESULTS ...................................................................................................................... 18 Hot Spot Analysis-Winter ......................................................................................... 18 Hot Spot Analysis-Spring .......................................................................................... 20 Hot Spot Analysis-Summer ....................................................................................... 23 Hot Spot Analysis-Fall .............................................................................................. 25 Bottom Habitat Characterization – General Information .......................................... 26 Bottom Habitat Characterization – Eastern Receivers .............................................. 27 Bottom Habitat Characterization – Central Receivers .............................................. 30 Bottom Habitat Characterization – Western Receivers ............................................. 33 DISCUSSION ............................................................................................................... 35 CONCLUSION ............................................................................................................. 40 LITERATURE CITED ................................................................................................. 41 CHAPTER 3: HABITAT USE OF ADULT SPOTTED SEATROUT IN RELATION TO WATER QUALITY WITHIN LAKE PONTCHARTRAIN, LOUISIANA ............. 45 INTRODUCTION ......................................................................................................... 45 METHODS .................................................................................................................... 48 Study Area ................................................................................................................. 48 Telemetry ................................................................................................................... 49 Monthly Water Quality Analysis ............................................................................... 51 Generalized Linear Model of Water Quality ............................................................. 54 RESULTS ...................................................................................................................... 55 High Fish Counts and Detections .............................................................................. 55 Monthly Water Quality Analysis- CDOM ................................................................ 60 Monthly Water Quality Analysis- Hydrocarbons ...................................................... 62 Monthly Water Quality Analysis- Turbidity ............................................................. 64 Monthly Water Quality Analysis- Dissolved Oxygen ............................................... 66 Monthly Water Quality Analysis- Temperature ........................................................ 68 v Monthly Water Quality Analysis- Salinity ................................................................ 71 Monthly Water Quality Analysis- Chlorophyll a ...................................................... 73 Monthly Water Quality Analysis- Correlations......................................................... 75 Generalized Linear Model of Water Quality ............................................................. 77 DISCUSSION ............................................................................................................... 80 CONCLUSION ............................................................................................................. 84
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