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The Impact of Coastal Dredging on Avian and Intertidal Macroinvertebrate Biodiversity of Morro Bay, California

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The Impact of Coastal Dredging on Avian and Intertidal Macroinvertebrate Biodiversity of Morro Bay, California ABSTRACT THE IMPACT OF COASTAL DREDGING ON AVIAN AND INTERTIDAL MACROINVERTEBRATE BIODIVERSITY OF MORRO BAY, CALIFORNIA Sandy beaches support dynamic and diverse, but physically narrow intertidal ecosystems that are vulnerable to the effects of anthropogenic disturbance, such as coastal dredging and beach nourishment. Our study site in Morro Bay, California has been a site of coastal dredging by the U.S. Army Corp of Engineers (USACE) since the 1960’s. In February of 2017, 240,000 cubic yards of sediment were dredged from the harbor and deposited onto the beach as beach nourishment. We assessed the impacts of this beach nourishment over two years on three aspects of beach ecosystems: 1) beach width, 2) avian biodiversity, and 3) intertidal macroinvertebrate biodiversity. We designated seven sampling sites and at each collected monthly measurements of beach width, monthly avian point counts, and quarterly macroinvertebrate samples. We found spatiotemporal variation present across months and sites, and beach width at the deposition site was significantly higher than the six control sites pooled together. Avian and macroinvertebrate biodiversity was not significantly different at the deposition site compared to the pooled control sites. Our results suggest that the dredge deposition had low or very short-term impacts to both avian and intertidal macroinvertebrate biodiversity at the deposition site over our two years of sampling. Positive impacts include a wider beach at the deposition site. Shelby Paige Moshier May 2020 THE IMPACT OF COASTAL DREDGING ON AVIAN AND INTERTIDAL MACROINVERTEBRATE BIODIVERSITY OF MORRO BAY, CALIFORNIA by Shelby Paige Moshier A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Biology in the College of Science and Mathematics California State University, Fresno May 2020 APPROVED For the Department of Biology: We, the undersigned, certify that the thesis of the following student meets the required standards of scholarship, format, and style of the university and the student's graduate degree program for the awarding of the master's degree. Shelby Paige Moshier Thesis Author Joshua Reece (Chair) Biology David Lent Biology Rory Telemeco Biology For the University Graduate Committee: Dean, Division of Graduate Studies AUTHORIZATION FOR REPRODUCTION OF MASTER’S THESIS X I grant permission for the reproduction of this thesis in part or in its entirety without further authorization from me, on the condition that the person or agency requesting reproduction absorbs the cost and provides proper acknowledgment of authorship. Permission to reproduce this thesis in part or in its entirety must be obtained from me. Signature of thesis author: ACKNOWLEDGMENTS I would like to thank my advisor, Dr. Joshua Reece, for his continuous support, guidance, and encouragement throughout this project and my education, and my committee members Dr. David Lent and Dr. Rory Telemeco for their support throughout this project. I would also like to thank my family for their support and encouragement throughout my education. I would also like to thank members of the Reece Lab, specifically Robert Seward, Rachel Morrow, Chrisionna Graves, Samantha Bever, Dalton Leibold, Natalie Yorba, and Lexi Walker, for all the fun times and their support in data collection and analysis for this project. I would also like to thank Cameron Alfving, Dr. Beth Weinman, and Dr. Mara Brady for their collaboration and work with the sedimentological data, and Dr. Eric Person for his work with the chemical analyses of the sediment. I would also like to acknowledge students in Dr. Reece’s CURE courses for their involvement in data collection. I would also like to acknowledge the support from Associated Students Inc., the Division of Research and Graduate Studies, and Faculty Supported Student Research Awards at California State University, Fresno for supplying grant funding that made this project and dissemination possible. I would also like to thank COAST, the UC Davis CMSI-COAST Scholars program, and the Robert L. Weigel scholarship for coastal studies for suppling grant funding that made this project and dissemination possible. TABLE OF CONTENTS Page LIST OF TABLES ....................................................................................................... vii LIST OF FIGURES ..................................................................................................... viii INTRODUCTION ...........................................................................................................1 LITERATURE REVIEW ................................................................................................4 Global Coastlines .....................................................................................................4 Anthropogenic Impacts on Coastlines ......................................................................5 Dredging and Beach Nourishment ............................................................................6 Morro Bay ...............................................................................................................9 METHODOLOGY ........................................................................................................ 15 Designating Sampling Locations ............................................................................ 15 Beach Width .......................................................................................................... 17 Coastal Bird Biodiversity ....................................................................................... 18 Intertidal Macroinvertebrate Biodiversity ............................................................... 19 RESULTS ..................................................................................................................... 21 Beach Width .......................................................................................................... 21 Coastal Bird Biodiversity ....................................................................................... 22 Intertidal Macroinvertebrate Biodiversity ............................................................... 26 CONCLUSION ............................................................................................................. 31 Discussion ............................................................................................................. 31 Previous Work on Dredging and Beach Nourishment ............................................. 36 Conservation and Management Implications .......................................................... 37 Limitations and Future Directions .......................................................................... 39 LITERATURE CITED .................................................................................................. 42 vi vi Page APPENDICES ............................................................................................................... 48 APPENDIX A: BEACH WIDTH DATA ....................................................................... 49 APPENDIX B: COASTAL AVIAN SPECIES LIST AND DATA ................................ 52 APPENDIX C: INTERTIDAL MACROINVERTEBRATE SPECIES LIST AND DATA ...................................................................................................... 56 APPENDIX D: NORTH-SOUTH COMPARISONS ..................................................... 60 LIST OF TABLES Page Table 1. Table of P-Values for T-tests Conducted on Four Measures of Coastal Avian Biodiversity. The Significance Threshold Was Set At 0.05. Values In Bold Are Statistically Significant. ............................................................... 26 Table 2. Table of P-Values for T-tests Conducted on Four Measures of Intertidal Macroinvertebrate Biodiversity. The Significance Threshold Was Set At 0.05. Values In Bold Are Statistically Significant. .......................................... 30 Table 3. Table of Beach Widths (Meters) Collected at Each Site. ................................... 50 Table 4. Table of All Bird Species Observed During 25 Months of Surveys. A Total of 48 Species Was Observed. .......................................................................... 53 Table 5. Table of All Intertidal Macroinvertebrate Species (Including Larvae) Observed During 11 Months of Quarterly Surveys. A Total of 51 Different Groups And 5 Types of Larvae Was Observed................................................ 57 Table 6. Table of P-Values for T-tests Conducted on North-South Comparisons of Beach Width, Four Measures of Coastal Avian Biodiversity, and Four Measures of Intertidal Macroinvertebrate Biodiversity. The Significance Threshold Was Set At 0.05. Values In Bold Are Statistically Significant. ....... 63 LIST OF FIGURES Page Figure 1. Morro Bay harbor and dredge project map (dredge sediment placement locations from 2013 USACE Draft Environmental Assessment for Morro Bay) .............................................................................................................. 10 Figure 2. Our 2017-19 sampling locations in Morro Bay, California. ............................. 16 Figure 3. Boxplot showing beach width for each of the seven survey sites across all 25 months. Beach width at the deposition site (Site 0) was significantly greater than beach width of the 6 control sites pooled. ................................... 21 Figure 4. Percent mean abundance of coastal birds sorted by order. Percent mean abundance for
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