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Sex Allocation in a Solitary Bee: a Behavioural Ecology Approach

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Sex Allocation in a Solitary Bee: a Behavioural Ecology Approach SEX ALLOCATION IN A SOLITARY BEE: A BEHAVIOURAL ECOLOGY APPROACH Jason Harvey Peterson B.Sc. Augustana University College, 2000 B.A. Augustana University College, 2000 THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE In the Department of Biological Sciences O Jason Harvey Peterson 2004 SIMON FRASER UNIVERSITY Fall 2004 All rights reserved. This work may not be reproduced in whole or in part, by photocopy or other means, without permission of the author. APPROVAL Name: Jason Harvey Peterson Degree: Master of Science Title of Thesis: Sex allocation in a solitary bee: A behavioural ecology approach Examining Committee: Chair: Dr. E. Palsson Dr. B .D. Roitberg, Professor Department of Biological Sciences, S .F.U. Dr. L.M. Dill, Professor Department of Biological Sciences, S.F.U. Dr. M.L. Winston, Professor Department of Biological Sciences, S .F.U. Public Examiner L ccCCvY\1'70~7 1.3 / OLt Date Approved . 11 SIMON FRASER UNIVERSITY PARTIAL COPYRIGHT LICENCE The author, whose copyright is declared on the title page of this work, has granted to Simon Fraser University the right to lend this thesis, project or extended essay to users of the Simon Fraser University Library, and to make partial or single copies only for such users or in response to a request from the library of any other university, or other educational institution, on its own behalf or for one of its users. The author has further granted permission to Simon Fraser University to keep or make a digital copy for use in its circulating collection. The author has further agreed that permission for multiple copying of tlus work for scholarly purposes may be granted by either the author or the Dean of Graduate Studies. It is understood that copying or publication of this work for financial gain shall not be allowed without the author's written permission.\ Permission for public performance, or limited permission for private scholarly use, of any multimedia materials forming part of this work, may have been granted by the author. This information may be found on the separately catalogued multimedia material and in the signed Partial Copyright Licence. The original Partial Copyright Licence attesting to these terms, and signed by this author, may be found in the original bound copy of this work, retained in the Simon Fraser University Archive. W. A. C. Bennett Library Simon Fraser University Burnaby, BC, Canada ABSTRACT Organisms reproducing sexually face the question of how to allocate investment to offspring between the sexes. My research objective was to evaluate the impact of ecological factors on maternal allocation decisions related to size, sex and number of offspring produced. Empirical and theoretical work was carried out using the alfalfa leafcutter bee, Megachile rotundata. Decreased resource levels resulted in lower maternal investment per daughter and fewer offspring produced; investment per son and sex ratio were unaffected. Increased flight distance required to obtain resources resulted in decreased investment per individual daughter and son, overall production of offspring and proportion of daughters produced. Using a dynamic state variable model to determine optimal maternal investment, I found optimal offspring size was controlled by the shape of maternal fitness return curves while sex ratio was influenced by numerous ecological factors. In conclusion, ecological factors appear to be important determinants of maternal investment in offspring. Dedication I would like to dedicate this thesis to my parents who have given me so much and helped me in so many ways throughout my entire life. As well as to Teri, whom I could not have done this without and Monty who was always up for an argument, regardless of the subject. Thanc you. Acknowledgements First and foremost, I would like to thank my senior supervisor, Bernie Roitberg, for his guidance and mentorship throughout this entire project. I would also like to thank my supervisory committee - Dr. Bernie Roitberg and Dr. Larry Dill - for their carefully considered advice as I prepared for and conducted this thesis research. I am grateful to Dr. Ron Ydenberg for his help developing the dynamic state variable model, and Graeme Cox who helped write the computer program. I also owe a debt of gratitude to those who supplied the land and materials to conduct my research: North Shore Farms, M.r. Pollination, BnR Farms, Scott Burton (who wasn't sure why I wanted to do it, but let me mow down parts of his field for my bees), Agriculture and Agri-Food Canada Lethbridge Research Centre and Undone Films. The manuscripts were improved by thoughtful and appreciated comments from Larry Dill, Bob Lalonde, Amanda Cardinal Ludwig, Brian Ma, Jen Perry, Bernie Roitberg and Monty Simo (who also gave me the ability to travel between Vancouver and Alberta freely). I am obliged to my laboratory assistant Angela Mah, for her assistance. Gordon Peterson was also of great help as a field assistant and a sounding board for my experimental designs, even if he thought what I was doing was sometimes a little crazy. The research was supported by the National Science and Engineering Research Council (NSERC) in graduate support and grants to Bernie Roitberg. I also would like to acknowledge the graduate support from the department. Finally, I must express my appreciation for the Roitberg lab group. My numerous discussions with Roitbergers improved countless aspects of this work, not to mention that I probably would not have survived without them. My mom also gets a special thank you, not only for imputing copious amounts of data, but for instilling in me, seemingly every day since 1984, the importance of backing up computer files. This came in handy when my hard drive self destructed six days before my thesis was due and then my laptop crashed five days before my thesis defence. Table of Contents .. Approval .......................................................................................................................11 ... Abstract .......................................................................................................................111 Dedication ......................................................................................................................iv Acknowledgements ...........................................................................................................v Table of Contents .............................................................................................................vi ... List of Figures .................................................................................................................vi11 .. List of Tables ...................................................................................................................xn Chapter 1 An Introduction to Sex Ratio Theory .........................................................2 1.1 An introduction ............................................................................................... 2 References ................................................................................................... 7 Chapter 2 Impact of Resource Levels on Sex Ratio and Resource Allocation in the Solitary Bee. Megachile rotundata .................................................10 Abstract ......................................................................................................... 10 Introduction .................................................................................................. 11 Material and methods ................................................................................... 14 Leafcutter bee life history ......................................................................... 14 Field experiment ....................................................................................... 15 Statistical analysis ..................................................................................... 17 Results .......................................................................................................... 17 Discussion ..................................................................................................... 19 References .................................................................................................... 25 Figures ..........................................................................................................30 Chapter 3 Impacts of Flight Distance on Sex Ratio and Resource Allocation to Offspring in the Leafcutter Bee. Megachile rotundata ...................... 40 Abstract ......................................................................................................... 40 Introduction ..................................................................................................41 Material and methods ...................................................................................44 Leafcutter bee life history ......................................................................... 44 Proposed maternal fitness curves .............................................................. 45 Field experiment ....................................................................................... 45 Statistical analyses .................................................................................. 47 Results ...................................................................................................... 48 Nest production ........................................................................................
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