Insecta: Diptera) in Tortuguero National Park, Costa Rica
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COMPARISON OF EMERGENCE AND TAXONOMIC COMPOSITION OF CHIRONOMIDAE (INSECTA: DIPTERA) IN TORTUGUERO NATIONAL PARK, COSTA RICA A THESIS SUBMITTED TO THE FACULTY OF THE GRADUATE SCHOOL OF THE UNIVERSITY OF MINNESOTA BY PETRA KRANZFELDER IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE ADVISOR DR. LEONARD C. FERRINGTON, JR. JANUARY 2012 © Petra Kranzfelder 2012 ACKNOWLEDGEMENTS Thank you to the many people that supported this thesis project. The Chironomidae Research Group, the Graduate School, and the Department of Entomology of the University of Minnesota provided financial support for this thesis. First of all, many thanks to my advisor, Leonard C. Ferrington, Jr., for encouraging balanced, passionate scientific research and helping me from the start to the end of this project. He provided endless, new opportunities and has let me explore and be creative as a new scientist. I thank my undergraduate professors at the Colorado College, Brian Linkhart and Shane Heschel, for providing me with the scientific base that I needed to succeed in graduate school. I was first exposed to formally collecting aquatic insects in Brian’s field zoology course. Thank you to Vicki Sherry, from the Minnesota Valley National Wildlife Refuge, who gave me the opportunity to work on an independent research project with Len while working as a biological technician at the refuge. Vicki gave me valuable environmental education and fieldwork experience and helped connect me with the University of Minnesota. I would like to thank my committee members, Ralph Holzenthal and Jennifer Powers, for supporting my Master’s thesis research. They have helped me design and edit this thesis. Thanks to Frances Matos-Schultz for edition of the Spanish version of the third chapter. Many thanks to Ralph Holzenthal, Will Bouchard, and Moriya Rufer for providing resources and skills related to scientific illustration and the identification guide. Moriya Rufer illustrated two of the figures in the introduction of this guide and i was kind enough to allow me to adapt them. Thanks to Martin Spies and Sofia Wiedenbrug for assistance with species identification and review of the third chapter. Thanks to Monika Springer and Paul Hanson from the University of Costa Rica and Ana Maria Monge and Javier Guevara from Costa Rica’s National System of Conservation Areas for helping me with supplies, research and collection permits, and research protocols while working in Tortuguero National Park, Costa Rica. Thank you to the members of the Chironomidae Research Group, especially Alyssa Anderson, Lori Krider, Jessica Miller, Alex Eagan, Catherine DeGuire, Jane Mazack, and Will French for help with field and laboratory work, specific chironomid and entomology help, and just general graduate school and life support. Thanks to Tony for helping me balance my heart and mind over the past year and showing me how to unwind and relax at the end of the day. Finally and most importantly, thank you to my family, Lynne, Ron, Sonja, Fern, and Fred. These five have always been and always will be my core support group. They have provided financial, spiritual, moral, and intellectual support for me throughout my educational and scientific career. ii DEDICATION This thesis is dedicated to my parents, Lynne and Ron. You two encouraged me to start this thesis and urged me to finish it. I will always do what I love and trust that everything else will follow. iii ABSTRACT Traditional methods of collecting aquatic macroinvertebrates can be time consuming and expensive. One efficient form of sampling involves collection of surface floating pupal exuviae (SFPE) of a group of aquatic flies of the family Chironomidae. Previous studies have shown the efficacy of the SFPE collection technique to determine chironomid taxonomic composition and temporal organization in small streams of northwestern Costa Rica. However, the methodology has never been employed in a Neotropical brackish water setting and its efficacy was unknown in this context. The primary goal of this study was to test the SFPE method in a Neotropical brackish water setting and to expand the knowledge base of chironomid taxonomy and ecology in Costa Rica. The objectives of this research were to determine the economy of the SFPE method for studies in Neotropical brackish waters and the variability of Chironomidae emergence and taxonomic composition. Collections of chironomid SFPE were made in the brackish water estuary, Laguna del Tortuguero, and freshwater stream, Quebrada, in Tortuguero National Park, Costa Rica on seven consecutive days during both the dry and wet seasons. The SFPE method appears to be a reasonably economical method for sampling Chironomidae in Neotropical brackish waters and it is successful in detecting spatial differences in emergence between sites in the dry and wet season. The results indicate that Chironomidae SFPE sampling could be employed as part of a rapid biomonitoring program for monitoring water and sediment quality in Tortuguero National Park, Costa Rica. Generally, these data will expand the knowledge base of Neotropical iv Chironomidae taxonomy and ecology, which will facilitate entomological and aquatic ecology research and teaching in Latin America. v TABLE OF CONTENTS LIST OF TABLES............................................................................................................. ix LIST OF FIGURES........................................................................................................... xi LIST OF ABBREVIATIONS........................................................................................ xxix CHAPTER 1: INTRODUCTION .................................................................................... 1 STUDY AREA ................................................................................................................... 7 MATERIALS AND METHODS ........................................................................................ 9 REFERENCES CITED ..................................................................................................... 12 CHAPTER 2: ECONOMY OF SORTING CHIRONOMIDAE SURFACE FLOATING PUPAL EXUVIAE SAMPLES FROM NEOTROPICAL BRACKISH WATERS IN TORTUGUERO, COSTA RICA ........................................................... 16 INTRODUCTION ............................................................................................................ 17 MATERIALS AND METHODS ...................................................................................... 18 RESULTS ......................................................................................................................... 20 DISCUSSION ................................................................................................................... 24 REFERENCES CITED ..................................................................................................... 28 CHAPTER 3: VARIABILITY OF CHIRONOMIDAE EMERGENCE AND TAXONOMIC RICHNESS IN LAGUNA DEL TORTUGERO AND QUEBRADA, TORTUGUERO NATIONAL PARK, COSTA RICA ................................................ 30 INTRODUCTION ............................................................................................................ 31 MATERIALS AND METHODS ...................................................................................... 34 vi RESULTS ......................................................................................................................... 37 DISCUSSION ................................................................................................................... 46 REFERENCES CITED ..................................................................................................... 52 CHAPTER 4: IDENTIFICATION GUIDE AND KEY TO CHIRONOMID PUPAL EXUVIAE OF TORTUGUERO NATIONAL PARK, COSTA RICA ...................... 55 INTRODUCTION............................................................................................................ 56 Family Chironomidae: Key to Subfamilies Key to subfamilies of Chironomidae pupae ............................................................... 64 Subfamily Tanypodinae: Keys to Genera and Species Key to genera of Tanypodinae pupae ........................................................................ 66 Ablabesmyia ............................................................................................................... 71 Coelotanypus .............................................................................................................. 73 Djalmabatista …......................................................................................................... 74 Fittkauimyia …............................................................................................................ 76 Labrundinia …............................................................................................................ 77 Larsia …..................................................................................................................... 79 Paramerina …............................................................................................................. 80 Procladius ….............................................................................................................. 81 Unknown Pentaneurini #1, #2, #3 ….......................................................................... 82 Subfamily Orthocladiinae: Keys to Genera and Species Key to genera of Orthocladiinae pupae.....................................................................