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The Role of Biotic and Environmental Factors in Spatial and Temporal Variability of Indian River Lagoon Copepod Communities

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The Role of Biotic and Environmental Factors in Spatial and Temporal Variability of Indian River Lagoon Copepod Communities The Role of Biotic and Environmental Factors in Spatial and Temporal Variability of Indian River Lagoon Copepod Communities by Hannah G. Kolb B.S. Oceanography Florida Institute of Technology 2011 A thesis submitted to Florida Institute of Technology in partial fulfillment of the requirements for the degree of Master of Science in Biological Oceanography Department of Ocean Engineering and Sciences Melbourne, Florida December 2016 The Role of Biotic and Environmental Factors in Spatial and Temporal Variability of Indian River Lagoon Copepod Communities A Thesis by Hannah G. Kolb Approved as to style and content by: ____________________________________________________________ Kevin B. Johnson, Ph.D. Associate Professor, Oceanography ____________________________________________________________ John Windsor, Ph.D. Professor Emeritus, Oceanography ____________________________________________________________ Jonathan Shenker, Ph.D. Associate Professor, Biological Sciences ____________________________________________________________ Stephen Wood, Ph.D. Department Head, DOES December 2016 ABSTRACT The Role of Biotic and Environmental Factors in Spatial and Temporal Variability of Indian River Lagoon Copepod Communities by Hannah G. Kolb B.S. Oceanography, Florida Institute of Technology Department of Ocean Engineering and Sciences Major Academic Advisor: Kevin B. Johnson, Ph.D. The role of zooplankton communities as the link between phytoplankton and secondary consumers is dependent on the species make-up of the copepod community. Copepods often dominate zooplankton in numbers and biomass and are frequently the dominant grazers. Species variabilities in behavioral and morphological traits, and seasonal variances in species make-up, have the potential to alter trophic dynamics in planktonic communities. The goal of this study was to identify the driving forces behind copepod community composition and better understand the role of key species in the Northern Indian River Lagoon (N-IRL). Copepods made up 76% of the N-IRL zooplankton community and have average densities of 2.3•104 ± 4.5•103 m-3. Three dominant species, Acartia tonsa, Oithona colcarva, and Parvocalanus crassirostris, make up >95% of the total copepod abundances. The relative dominance of these species shifts spatially iii between sites (p<0.01) and temporally between wet and dry seasons (p<0.05). Likely intrazooplanktonic predators (the chaetognath Sagitta sp., the ctenophore Mnemiopsis leidyi, and larval fish) had no apparent impact on copepod community abundance. Of all abiotic and biotic factors examined, copepod composition was most closely correlated to relative chlorophyll and Secchi depth (R=0.41), both of which were impacted by algal bloom events. Although communities did not display strong seasonality, their densities and composition do seem to be driven from the bottom up. iv ACKNOWLEDGEMENTS This project would never have been completed without the support of so many people. I first want to thank my advisor Dr. Kevin Johnson for encouraging me down the zooplankton path and for his patience and guidance though the dozens of drafts. Thank you, Dr. John Windsor, for asking hard questions and not always expecting an answer. Thank you, Dr. Jon Shenker, for contributing your expertise to produce this finished product. Thank you, Holly Sweat, for being my field and laboratory partner over the past 3 years and for patiently answering my never- ending questions. Thank you, Bill Battin, for being a friendly face on the bad days and always helping me get the job done. Thank you, Xiao Ma, Angel Seery, Tony Cox, Casey Hederman, and Kate Beckett, for being so willing to spend long days on the water so I could get my samples. Thank you, Xiao Ma and Angel Seery, for your help in the lab with the most boring of tasks. Thank you, Casey Hederman, for making the unreadable readable. Thank you to my sisters Sarah and Rachel for always encouraging me. Most of all, thank you to my parents Roger and Mary Kay Kolb for encouraging my love of nature from the start and for always supporting me in whatever I do. v Table of Contents ABSTRACT .................................................................................................................. iii ACKNOWLEDGEMENTS .............................................................................................. v LIST OF TABLES AND FIGURES ................................................................................. viii Tables ............................................................................................................... viii Figures ................................................................................................................. x INTRODUCTION ..........................................................................................................1 Community Succession .......................................................................................2 Regulation of Planktonic Populations .................................................................3 Bottom-up Controls ............................................................................................5 Location...............................................................................................................5 METHODS ...................................................................................................................6 Study Site Description .........................................................................................6 Field Methods .....................................................................................................8 Laboratory Processing ........................................................................................9 Analysis ...............................................................................................................9 RESULTS ....................................................................................................................10 Community Make-up ........................................................................................10 vi Wet/Dry Season Variability in the Copepod Community .................................18 Environmental Factors ......................................................................................19 Impact of Algal Blooms on Community Composition .......................................26 Intraplanktonic Predators .................................................................................28 DISCUSSION ..............................................................................................................33 Dominant Species .............................................................................................33 Biotic Factors ....................................................................................................35 Seasonal Patterns in Copepod Communities ...................................................35 Potential Predation Effects ...............................................................................36 Environmental Factors ......................................................................................41 Biotic Versus Abiotic Factors ............................................................................42 Copepod Community Function .........................................................................42 CONCLUSIONS ..........................................................................................................44 REFERENCES .............................................................................................................46 APPENDIX: ................................................................................................................54 Average Densities of Dominant Copepod Species by Season and Year ...........54 vii LIST OF TABLES AND FIGURES Tables Table 1. Seasonal presence/absence patterns of occurrence of all copepod species in N-IRL June 2013 to June 2016. Presence classified as the species being observed in >1 sampling during that seasonal period. Seasons were classified as Summer (June-Aug), Autumn (Sept-Nov), Winter (Dec-Feb), Spring (Mar-May). ML=Mosquito Lagoon, TV=Titusville, CV=Cocoa .....................................................13 Table 2. Rankings of abundant copepod species that make up >1% of the copepod community. Average % and mean densities (# m-3) represent biweekly replicated samplings (n=4 reps/site) collected June 2013-June 2016. Species contributing <1% to overall composition were excluded. ....................................................................15 Table 3. ANOSIM and SIMPER analysis of species contributions per wet/dry season. Samples collected biweekly (n=4 reps/site) June 2013-June 2016.). .........18 Table 4. Regression analysis of dominant copepod species of the N-IRL with environmental variables. Replicated samplings (n=4 reps/site) were conducted biweekly June 2013-June 2016 ................................................................................23 Table 5. ANOSIM/SIMPER analysis of species percent contributions under bloom and non-bloom conditions. Densities (# m-3) fourth-root transformed to reduce weight of abundant species. Samples collected June 2013-June 2016. ..................27 viii Table 6. Regression analysis of dominant copepod species (>1%) with biotic factors including other dominant copepod species and commonly occurring planktonic predators. Samples collected biweekly (n=4 reps/site) June 2013-June 2016. .......32 ix Figures Figure
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