Non-Calanoid Copepods at the Bermuda Atlantic Time-Series Study (BATS) Station: Community Structure and Ecology, 1995-1999
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University of South Florida Scholar Commons Graduate Theses and Dissertations Graduate School 11-17-2009 Non-Calanoid Copepods at the Bermuda Atlantic Time-Series Study (BATS) Station: Community Structure and Ecology, 1995-1999 Hussain Ali Al-Mutairi University of South Florida Follow this and additional works at: https://scholarcommons.usf.edu/etd Part of the American Studies Commons Scholar Commons Citation Al-Mutairi, Hussain Ali, "Non-Calanoid Copepods at the Bermuda Atlantic Time-Series Study (BATS) Station: Community Structure and Ecology, 1995-1999" (2009). Graduate Theses and Dissertations. https://scholarcommons.usf.edu/etd/1824 This Dissertation is brought to you for free and open access by the Graduate School at Scholar Commons. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Scholar Commons. For more information, please contact [email protected]. Non-Calanoid Copepods at the Bermuda Atlantic Time-Series Study (BATS) Station: Community Structure and Ecology, 1995-1999 by Hussain Ali Al-Mutairi A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy College of Marine Science University of South Florida Major Professor: Joseph Torres, Ph.D. Deborah Steinberg, Ph.D. David Mann, Ph.D. Kendra Daly, Ph.D. Ernst Peebles, Ph.D. Date of Approval: November 17, 2009 Keywords: C: N-cycling, Trichodesmium, Macrosetella, Oncaea, microzooplankton © Copyright 2009, Hussain Al-Mutairi Dedication This work is dedicated to the people who mean the most to me—my mother and father whose guidance built my character, and my sisters Soraya and Suhaila who encouraged me to go on during the rough patches. Finally, and most importantly, I dedicate this dissertation to my daughters Norah, Alyah, and Amani. It was to provide a better future for them that I took on the challenge of earning my Ph.D. Acknowledgements Numerous people and institutions have been instrumental in creation of this work and are too numerous to acknowledge individually here. However, there are some that due to the magnitude of their contribution necessitate mention. Firstly, I would like to acknowledge my appreciation for the Kuwait Public Authority for Applied Education and Training for the opportunity to further my education by providing a full scholarship for 4 years. Additional funding came from the Bermuda Institute of Ocean Sciences (BIOS) for a 3 week stay at the BIOS institute in Bermuda. I am greatly indebted to my supervisor Joseph Torres who took a chance by accepting me as a student in his lab and for his understanding of my circumstances during the entire process and especially towards the end. Also, I am grateful to all my committee members for their expertise and help. In particular I would like to thank Dr. Deborah Steinberg who allowed me to work on the archived BATS zooplankton samples. I would also like to take this opportunity to thank Dr. Michael Lomas for allowing me unfettered use of his laboratory while working on the Taylor tows. Note to Reader Due to the discovery, just prior to publication of this dissertation, of a systematic error outside the author‘s control involving an underestimation of volumes filtered for all BATS 200 µm-net samples, the reader should bear in mind that all copepod abundance results of chapters 2 and 3 should be multiplied by 0.82 to achieve the corrected values. Table of Contents List of Tables ................................................................................................................................................ vi List of Figures .............................................................................................................................................. ix Abstract ...................................................................................................................................................... xiii Chapter One: Introduction ............................................................................................................................. 1 Background ..................................................................................................................................... 2 Organization .................................................................................................................................... 4 Chapter Two: BATS 200 µm Net Non-Calanoid Copepod Community Structure: Diel, Seasonal, Interannual Patterns and Ecology ........................................................................................................... 6 Introduction ..................................................................................................................................... 7 Materials and Methods .................................................................................................................... 9 Shipboard Sample Collection ........................................................................................... 9 Processing for Community Structure Analysis ................................................................. 9 Metabolic Estimations .................................................................................................... 10 Estimation of Larvacean House C Production at BATS ................................................. 12 Ancillary BATS Data ..................................................................................................... 13 Statistical Methods .......................................................................................................... 13 Results ........................................................................................................................................... 14 Net Tow Data .................................................................................................................. 14 General Community Composition .................................................................................. 15 Diel Differences ............................................................................................................. 19 Annual and Seasonal Patterns of Total Non-Calanoid Abundance at BATS .................. 20 Oithona and Oncaea spp. Annual and Seasonal Trends ................................................. 20 Corycaeus and Farranula spp. Annual and Seasonal Structure ..................................... 24 Seasonal and Annual Trends of Lubbokia spp ................................................................ 30 i Annual and Seasonal Community Structure of Sapphirinid Copepods .......................... 31 Patterns of Other Non-Calanoid Groups at BATS .......................................................... 32 Non-Calanoid Abundance Relationship to Environmental Factors ................................ 48 Primary Production and Pigments .................................................................................. 48 Particulate Organic Carbon (POC) ................................................................................. 49 Role of Non-Calanoid Copepods in C and N Dynamics at BATS .................................. 51 Feeding Strategies of Oithona spp. and their Ecological Significance to the BATS Area .............................................................................................................. 55 Ecological Role of the Association of Oncaeidae with Larvacean Houses .................... 56 Discussion ..................................................................................................................................... 58 Comparison to Previous Studies near BATS .................................................................. 58 Causes of Observed Seasonal and Annual Patterns in Community Structure and Abundance ............................................................................................................... 61 Assumptions used in Estimating Consumption of Larvacean Houses by Oncaeid Copepods ................................................................................................................. 65 Sapphirina spp. Associations with Salps at BATS ......................................................... 68 Summary and Conclusions ............................................................................................. 69 Chapter Three: Harpacticoid Copepods of the Family Miraciidae: The Ecological Consequences of their Association with Trichodesmium spp. to the BATS Region ........................................................ 71 Introduction ................................................................................................................................... 72 Materials and Methods .................................................................................................................. 75 Sample Collection and Processing .................................................................................. 75 Biomass Estimates .......................................................................................................... 75 Carbon-Specific Grazing Rates....................................................................................... 76 Nitrogen Excretion Rates ................................................................................................ 77 Assimilation and C Portioning ........................................................................................ 78 Trichodesmium C and N Standing Stock and Production at BATS ................................ 79