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Redirect Notice UC San Diego Research Theses and Dissertations Title The population dynamics of mitten crab larvae in the San Francisco Bay Permalink https://escholarship.org/uc/item/01g8c0ck Author Gonzales, Vanessa Alexandra Publication Date 2010-10-01 eScholarship.org Powered by the California Digital Library University of California ABSTRACT THE POPULATION DYNAMICS OF MITTEN CRAB LARVAE IN THE SAN FRANCISCO BAY The Chinese mitten crab, Eriocheir sinensis, has a history of invasions in numerous countries. In 1992, the Chinese mitten crab was introduced to the San Francisco Bay/Delta system. Since its invasion in the San Francisco Bay, it has become an aquatic nuisance species. Little is known about the population dynamics of the megalopa stage of the Chinese mitten crab in the San Francisco Bay estuary, particularly the megalopa stage. Light traps are often used to sample marine larvae and can provide measures for relative abundance of larvae between sampling locations. As part of an ongoing study to monitor mitten crab larvae in the San Francisco Bay, light trap and plankton tow samples were analyzed for mitten crab megalopae and zoeae. In order to implement low cost sampling devices for mitten crab megalopae such as light traps, it is necessary to be able to identify their larvae in collected samples. Thus, the main objective of this work was to develop a means to distinguish mitten crab megalopae from other native and invasive brachyuran megalopae inhabiting the San Francisco Bay Estuary. The minimal amount of mitten crab megalopae found in light trap samples may be linked to the recent decline of mitten crab zoeae in San Pablo Bay. Vanessa Alexandra Gonzales August 2010 THE POPULATION DYNAMICS OF MITTEN CRAB LARVAE IN THE SAN FRANCISCO BAY by Vanessa Alexandra Gonzales 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 August 2010 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. Vanessa Alexandra Gonzales Thesis Author Brian Tsukimura (Chair) Biology Steven C. Blumenshine Biology Ryan Earley University of Alabama, Biological Sciences 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 writer: ACKNOWLEDGMENTS I want to offer my sincerest thanks to my advisor, Brian Tsukimura, for his guidance and support throughout my graduate studies. I would also like to thank the members of my thesis committee Steven Blumenshine, and Ryan Earley, for their advice and insight during the writing of my thesis. Many thanks are owed to the members of the lab for helping with the enormous task of analyzing samples. I greatly appreciate the help of all the undergraduate lab members, especially, Marcos Duran, who went through what might have seemed like an endless amount of samples. I am heartily thankful to the other graduate lab members, Nagaraju Kotagiri, Mike Gledhill., Mike Tran, Alan Terusaki, and Steven Gong for assisting me with my research when they were very busy with their own. I am very grateful to Tito Castañeda, for the fantastic job he did illustrating the megalopae key. I would like to thank the National Sea Grant College Program of the U.S. Department of Commerce’s National Oceanographic and Atmospheric Administration under NOAA Grant #NA06RG0142, the California Sea Grant College Program, the U.S. Fish and Wildlife Service, and the College of Science and Mathematics at CSU, Fresno for funding my research. My family has been especially supportive during my time at Fresno State. I would like to thank my parents for instilling in me the importance of education and for making me feel like I could accomplish anything. I would like to thank my sister and brother-in-law for their love and support. And lastly, I owe my deepest thanks to my husband for his endless love, understanding, and encouragement. TABLE OF CONTENTS Page LIST OF TABLES . vii LIST OF FIGURES . ix INTRODUCTION . 1 Chinese Mitten Crab Life History Stages . 2 Chinese Mitten Crab Invasion History . 3 Environmental Factors Influencing Growth and Survival of Brachyuran Megalopae . 5 Research Objectives . 6 MATERIALS AND METHODS . 8 Megalopae Dichotomous Key . 8 Megalopae Distribution . 10 Zoeae Identification and Abundance . 10 Environmental Parameters . 12 RESULTS . 14 Introduction . 14 A Key to Brachyuran Megalopae of the San Francisco Bay Estuary System 14 Megalopae Distribution . 21 Zoeae Abundance . 21 Environmental Parameters . 23 DISCUSSION . 25 Megalopae Dichotomous Key . 25 Megalopae Distribution . 26 Zoeae Abundance . 28 vi Page Conclusion . 32 LITERATURE CITED . 33 APPENDICES . 42 A. MEGALOPAE KEY FIGURES . 43 B. FIGURES . 56 C. TABLES . 65 LIST OF TABLES Table Page 1. Sources of descriptions and illustrations for each species of brachyuran megalopae presented in the dichotomous key . 66 2. Relative Abundance of the species of brachyuran zoeae collected at station D41 from 1998-2008, ranked by the percentage of the total abundance of all species . 67 3. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 1998, ranked by the percentage of the total abundance of all species . 67 4. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 1999, ranked by the percentage of the total abundance of all species . 68 5. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2000, ranked by the percentage of the total abundance of all species . 68 6. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2001, ranked by the percentage of the total abundance of all species . 69 7. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2002, ranked by the percentage of the total abundance of all species . 69 8. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2003, ranked by the percentage of the total abundance of all species . 70 9. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2004, ranked by the percentage of the total abundance of all species . 70 10. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2005, ranked by the percentage of the total abundance of all species . 71 11. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2006, ranked by the percentage of the total abundance of all species . 71 viii Table Page 12. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2007, ranked by the percentage of the total abundance of all species . 72 13. Relative Abundance of the species of brachyuran zoeae collected at station D41 in 2008, ranked by the percentage of the total abundance of all species. 72 LIST OF FIGURES Figure Page 1. Eriocheir sinensis life stages . 57 2. Map of light trap sampling locations in San Pablo Bay, Point San Pablo (PSP), Point Pinole (PP), and McNear’s Beach (MB); USGS continuous monitoring gauge (T/S1) and NERRS monitoring gauge (T/S2) provided temperature and salinity data . 58 3. Eriocheir sinensis megalopae found in light traps from 2007-2008 . 59 4. Eriocheir sinensis zoeae and adult mitten crab abundances in San Pablo Bay from 1998-2008 . 60 5. Eriocheir sinensis zoeae abundance and temperature in the San Pablo Bay from 1998-2008 . 61 6. Eriocheir sinensis zoeae abundance and salinity in the San Pablo Bay from 1998-2008 . 62 7. Monthly average zoeae abundance for E. sinensis, M. gracilis, and C. productus from 1998-2008 . 63 8. Relative abundance of the species of brachyuran zoeae collected at station D41 for every year from 1998-2008 . 64 INTRODUCTION The opportunity for non-native species to disperse to new habitats has greatly increased as humans have become more and more mobile. Many invasive species have been introduced to different environments because of human activities. In the past, geographic barriers, such as oceans, deserts, and mountains, made it difficult for species to colonize new habitats. However, the transoceanic movement of humans has helped to facilitate the invasion of many species to novel habitats (Bright, 1999; McNeely, 2006). The consequences of such invasions often are negative (Vitousek et al, 1997; Sanders et al., 2003). Aquatic habitats are among the most invaded environments (Ruiz et al., 1999). This is probably due to commercial shipping, fishing, and recreational activity that occur in these habitats (LeMaitre et al., 2004; McNeely, 2006). Although unsuccessful invasions go unnoticed, aquatic invaders that are successful in establishing populations can have dramatic affects on the structure and function of the ecosystem that they invade (Miehls et al., 2009; Pejchar and Mooney, 2009). Once a nuisance species has been established, control efforts can be extremely costly (Pimetel et al., 2001; Pimetel et al., 2005). Some introduced species can even act as vectors for disease, and thus pose risks to native species and in some cases human populations (Prenter et al., 2004; Cohen, 2003). One aquatic ecosystem that has been heavily invaded is the San Francisco Bay Estuary (Cohen and Carlton, 1998). The Chinese mitten crab, Eriocheir sinensis, is a problematic invader in the San Francisco Bay (Veldhuizen, 1997; Veldhuizen and Stanish, 1999; Rudnick et al.
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