University of Copenhagen. Evolutionary ecology of fungal parasites in honey bees Vojvodic, Svjetlana. Publication date: 2010
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1 university of copenhagen University of Copenhagen Evolutionary ecology of fungal parasites in honey bees Vojvodic, Svjetlana Publication date: 2010 Document Version Publisher's PDF, also known as Version of record Citation for published version (APA): Vojvodic, S. (2010). Evolutionary ecology of fungal parasites in honey bees. Department of Agriculture and Ecology, University of Copenhagen. Download date: 17. Sep. 2016
2 EVOLUTIONARY ECOLOGY OF FUNGAL PARASITES IN HONEY BEES Svjetlana Vojvodic University of Copenhagen August 2010 Supervisor Jørgen Eilenberg Co-supervisor Annette Bruun Jensen
3 PREFACE This thesis has been submitted to The Faculty of Life Sciences, University of Copenhagen, in partial fulfillment of the requirements for the degree Doctor of Philosophy in the Department of Agriculture and Ecology, University of Copenhagen. This thesis consists of an introduction, which describes the background and objectives of this thesis and the following three chapters are manuscripts written to report the findings of this PhD project. During the project I spent one month in USDA-ARS Logan, Utah, USA, hosted by Rosalind R. James. Svjetlana Vojvodic Copenhagen Denmark August 2010 ii
4 ACKNOWLEDGEMENTS I would like to thank a number of people who have helped me during my thesis. First of all I would like to thank my supervisors Jørgen Eilenberg who has given me an opportunity to work with honey bee pathogens, and for his optimism and encouragement. I especially would like to thank my project supervisor Annette Jensen for introducing me to honey bee pathology, our fruitful discussions and her friendship during the past three years. Further I would like to thank Koos Boomsma for his scientific guidance and mentoring. I am very grateful to have been a part of the Zoology Department and the Centre for Social Evolution, making it possible for me to learn applied aspects of science, as well the evolution of social insects. I m very grateful to Rosalind James for being a wonderful host during my stay at the USDA in Logan, Utah, and for being a very motivating collaborator. I would also take this opportunity to thank Ellen Klinger and Craig Huntzinger at the Logan Bee Lab for all their help with the experiments and for making my stay in Logan most enjoyable. Special thanks goes to Charlotte Nielsen, Per Moestrup, Nikolai Meyling and Christina Wolsted for their scientific help and for being wonderful colleagues and friends. Thanks to Eva Forsgren for help with honey bee in vitro rearing. Big thanks go to all my colleagues and friends at the LIFE Faculty in no particular order: Per Winberg, Sofie Schmidt, Nafi Solaiman Al-Sabi, Louise Larsen, Charlotte Fischer, Bernhardt Steainwender, Anja Amtoft Wynns, Camilla Falk, Camilla Falk, Hanna Hansen, Hanne Christiansen, Peter Esbjerg, Søren Navntoft, Erica Ahrenfeldt, Lene Sigsgaard, Rasmus Nimgaard, Mikael Petersen, Bo Markusne, Sébastien Louarn, Thomas Kichey, Jakob Skov, Simon Mundus, R.K. Shetty. I would also like to thank everyone else at Centre for Social Evolution: Patrizia D Ettorre, David Nash, Anna Schmidt, Volker Nehring, Line Ugelvig, Susanne den Boer, David Hughes, Sandra Andersen, Jelle van Zweden, Luke Holman, Lena Grinsted, Nana Hesler, Sophie Armitage, Henrik de Fine Licht, Fernando Guerrieri, Tatyana Semenova, Alen Kristof, Stephanie Dreier, Nick Bos, Caspar Schöning. For his help with my thesis writing, insightful conversations and his friendship, I would like to thank Tim Linksvayer. I am very grateful to Jens Broch for his help throughout my thesis and during the writing process of the manuscripts and for modifying the figures in the synopsis. I would like to thank John McCreadie, my lifelong mentor and friend. iii
5 I am grateful to my family and friends for their patience and support throughout my long education. I would like to thank the Danish National Research Foundation and the Faculty of Life Sciences of the University of Copenhagen and the Centre for Social Evolution for funding. iv
6 ABSTRACT Among honey bees (Apis mellifera) an exceptionally diverse set of parasites has been described that can lead to reduced productivity and colony failure. In recent years, due to the dramatic increase in worldwide losses of managed honey bee colonies, great emphasis has been placed on understanding honey bee parasites and host parasite interaction. Certain diseases, such as the fungal brood disease known as chalkbrood, persist in many honey bee colonies. Chalkbrood is caused by the fungus Ascosphaera apis, a specialist parasite that reproduces only after invading honey bee larvae. Other Ascosphaera species such as Asc. proliperda have been found to cause diseases only in solitary bee brood, while the avirulent pollen fungus Asc. atra has been commonly described in association with solitary bees. While obligate parasites such as chalkbrood can be expected to have evolved adaptations to exploit specific situations of reduced innate or behavioral host immunity, this is less obvious for facultative parasites. Several species of the fungal genus Aspergillus, such as Asp. flavus, are facultative parasites that kill honey bees in all stages of development and cause a honey bee brood disease known as stonebrood. In this thesis, I investigated the etiology and the evolution of chalkbrood disease; in particular I focused on how temperature and the presence of other types of fungal parasites shape the outcome of host-parasite interactions and parasite-parasite dynamics. In order to have controlled experimental conditions, I developed protocol for in vitro rearing of honey bee larvae that was used throughout this thesis. In general, entomopathogenic fungi virulence, expressed as the number of infected and killed hosts, has been observed to depend on parasite concentration (dosage). In my first chapter I have shown that an increase in parasite concentration at infection had a more dramatic effect on host mortality induced by the facultative parasite causing stonebrood compared to the obligate parasite causing chalkbrood. In addition, previous colony infection trials with chalkbrood disease have indicated that accidental drops in brood temperature increase the prevalence of chalkbrood, but it has remained unclear whether parasite virulence is directly temperature-dependent. I have shown that chalkbrood and stonebrood inducing parasites use different strategies to invade the honey bee host. I found that a 24 hour cooling period after exposure to chalkbrood decreased larval survival, whereas such a cooling period improved survival of stonebrood exposed larvae. These results raise interesting questions about honey bee defenses against obligate and facultative parasites and about the extent to which stress factors in the host (dis)favor parasites with lesser degrees of specialization. Infection with several parasites (mixed infections) can often result in increased virulence relative to single infections, possibly due to increased parasite densities or due to the inability of a host to defend itself against multiple parasites at once. In my second chapter, using the honey bee larva as a model organism, I investigated whether the virulence of Asc. apis can be altered by the presence of other Ascosphaera species that usually do not induce infections. Mixed infections of Asc. apis with Asc. atra- a pollen saprophyte of solitary bees, led to increased virulence compared to Asc. apis alone. In addition, mixed infections of Asc. apis and Asc. proliperda- the causative agent of chalkbrood in solitary bees, did not differ in virulence that was induced by Asc. apis alone. v
7 This study demonstrated that some parasites that are thought to be avirulent may in fact interact with the virulent parasites, affecting the outcome of host-parasite interactions, and in some cases resulting in increased host mortality. In my final chapter I found that both parasite strain and colony of larval origin affected mortality rates. Genetically different strains of chalkbrood caused different levels of larval mortality, suggesting that one level of virulence is not optimal for all host genotypes. Significant variation in host susceptibility to chalkbrood has also been observed across honey bee colonies. Together these results showed that chalkbrood and honey bee genotype interact to determine virulence, as expected under parasite-host co-evolution. From an applied perspective, understanding the timing and factors that trigger and mediate host-parasite interactions can offer important insight for the control and prevention of honey bee fungal infections. Finally, the results of my thesis indicate that the interaction between chalkbrood and honey bees, and chalkbrood and other fungal parasites provide an attractive model system to study host-parasite co-evolution in social insects. vi
8 RESUMÉ (ABSTRACT IN DANISH) Der kendes et betydeligt antal forskellige parasitter fra honningbier (Apis mellifera), og flere af disse kan føre til nedsat produktivitet og tab af bifamilier. I de seneste år har der, grundet en dramatisk stigning i det globale tab af bifamilier, været fokus på at opnå bedre forståelse af honningbiens parasitter, samt vært-parasit interaktioner. Visse sygdomme, så som yngelsygdommen kalkyngel, optræder i mange bifamilier. Kalkyngel er forårsaget af svampen Ascosphaera apis, en specialiseret parasit, der kun reproduceres efter at have inficeret honningbilarver. Andre Ascosphaera arter, så som Asc. proliperda har vist sig kun at forårsage sygdomme i yngel fra enlige bier, mens den avirulente pollensvamp Asc. atra findes almindeligt i redesteder for enlige bier. Obligate parasitter, så som kalkyngel, må forventeligt have udviklet specielle tilpasninger for at udnytte de specifikke situationer, hvor værtens innate (medfødte) eller adfærdsmæssige immunitet er nedsat. Derimod er det mindre sandsynligt at fakultative parasitter udvikler specielle tilpasninger. Flere arter inden for svampeslægten Aspergillus, for eksempel Asp. flavus, er fakultative parasitter, der kan inficere honningbier i alle udviklingsstadier og kan forårsage yngelsygdommen stenyngel. I denne PhD afhandling har jeg undersøgt ætiologien og udviklingen af kalkyngelsygdommen Asc. apis. Jeg har især fokuseret på, hvorledes temperatur og tilstedeværelse af andre svampeparasitter påvirker udfaldet af vært-parasit interaktioner og parasit-parasit dynamikker. Til sikring af kontrollerede eksperimentelle betingelser var det nødvendigt at udvikle en egnet metode til in vitro opdræt af honningbilarver, og denne metode blev brugt i hele afhandlingen. Generelt måles virulens af insektpatogene svampe som antal svampedræbte værter (af eksponerede), og det er kendt, at virulensen er afhængig af parasitkoncentrationen (dosis). I første kapitel viser jeg, at en øget parasitkoncentration af en fakultativ parasit, der giver stenyngel, har en mere dramatisk effekt på værtsdødeligheden i forhold til det obligate parasitter, der giver kalkyngel. Desuden har tidligere infektionsforsøg i hele kolonier med sygdommen kalkyngel antydet, at nedkøling af yngellejet øger prævalensen af kalkyngel, men det er stadig uvist, om virulensen er direkte temperaturafhængig. Forsøgene viste at kalkyngel- og stenyngelinducerende svampe bruger forskellige strategier til at invadere honningbiværten. Jeg fandt, at en 24-timers nedkølingsperiode efter eksponering af kalkyngel nedsatte larvernes overlevelse, hvorimod at samme nedkølingsperiode øgede larvernes overlevelse, når larverne blev eksponeret for stenyngel. Disse resultater rejser interessante spørgsmål dels om honningbiens forsvar mod obligate og fakultative parasitter, og dels om i hvilket omfang stressfaktorer i værten favoriserer parasitter med en mindre grad af specialisering. Infektioner med flere parasitter på en gang (blandede infektioner) vil ofte resultere i øget virulens i forhold til enkelte infektioner. Muligvis på grund af øget parasittæthed eller på grund af værtens manglende evne til at forsvare sig mod flere parasitte på samme tid. I mit andet kapitel, hvor jeg atter brugte honningbilarver som modelorganisme, har jeg undersøgt om virulensen af Asc. apis ændres ved tilstedeværelsen af andre Ascosphaera arter, der normalt ikke inducerer infektion. Blandede infektioner med Asc. apis og pollensaprofytten Asc. atra resulterede i øget virulens i forhold til infektioner med Asc. apis alene. Derimod gav forsøg med Asc. apis og Asc. poliperda, der inficerer og forårsager vii
9 kalkyngel i enlige bier, ingen forskel i blandede eller enkelte infektioner. Dette forsøg demonstrer, at organismer, der menes at være avirulente, faktisk kan interagere med virulente parasitter og påvirke udfaldet af vært-parasitinteraktionen, og i nogle tilfælde resultere i øget værtsdødelighed. I mit sidste kapitel fandt jeg, at både parasitstamme og bifamilie, hvorfra larverne kom, påvirkede dødeligheden. Genetisk forskellige kalkyngelstammer gav forskellig larvedødelighed, hvilket tyder på, at et virulensniveau ikke er optimalt for alle værtsgenotyper. Der blev også fundet signifikant variation af modtagelighed over for kalkyngel på tværs af bifamilier. Disse resultater påpeger, at kalkyngel og honningbigenotyper interagerer og at samspillet er en vigtig faktor for udfaldet af virulensen, som forventet i forhold til vært-parasit co-evolutionsmodeller. Fra et anvendt perspektiv er forståelsen af timing og faktorer, der er afgørende for værtparasitinteraktioner, vigtig og kan give informationer af afgørende betydning for bekæmpelse og forebyggelse af honningbiens svampeinfektioner. Endeligt har resultaterne af mine studier også vist, at samspillet mellem kalkyngel og honningbier samt kalkyngel og andre svampe parasitte er et attraktivt modelsystem, der kan bruges til at studere vært-parasit co-evolution i sociale insekter. viii
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