Research Collection Doctoral Thesis Influence of temperature on host location by vibrational sounding in two pupal parasitoids Author(s): Kroder, Stefan Publication Date: 2006 Permanent Link: https://doi.org/10.3929/ethz-a-005205861 Rights / License: In Copyright - Non-Commercial Use Permitted This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH Library Diss. ETH No. 16615 Influence of temperature on host location by vibrational sounding in two pupal parasitoids A dissertation submitted to the SWISS FEDERAL INSTITUTE OF TECHNOLOGY ZURICH for the degree of Doctor of Sciences ETH Zurich Stefan Kroder Dipl. Biol., University of Freiburg i.Br. born 19 June 1974 Freiburg i.Br., Germany accepted on the recommendation of Prof. Dr. S. Dorn, examiner Dr. J. Samietz, co-examiner 2006 2 3 Contents 1. Summary ............................................................................................................... 6 2. Zusammenfassung ................................................................................................ 9 3. General Introduction........................................................................................... 13 4. Ambient temperature affects mechanosensory host location in a parasitic wasp1........................................................................................................................ 17 Abstract................................................................................................................ 17 4.1 Introduction ................................................................................................... 17 4.2 Material and methods ................................................................................... 19 Parasitoid rearing ............................................................................................ 19 Plant stem model ............................................................................................. 20 Experimental design........................................................................................ 20 Data analysis ................................................................................................... 21 4.3 Results ........................................................................................................... 22 Responsiveness ................................................................................................ 22 Quantitative insertion activity........................................................................ 22 Precision of host location ................................................................................. 23 4.4 Discussion ...................................................................................................... 25 5. Effect of ambient temperature on mechanosensory host location in two parasitic wasps of different climatic origin2 .......................................................... 29 Abstract................................................................................................................ 29 5.1 Introduction ................................................................................................... 30 5.2 Materials and methods.................................................................................. 32 Parasitoid rearing ............................................................................................ 32 Plant-stem model ............................................................................................. 32 Experimental design........................................................................................ 32 Data analysis ................................................................................................... 33 5.3 Results and discussion .................................................................................. 35 4 6. Adjustment of vibratory signals to ambient temperature in a host-searching parasitoid3 ............................................................................................................... 42 Abstract................................................................................................................ 42 6.1 Introduction ................................................................................................... 43 6.2 Material and methods ................................................................................... 45 Parasitoid rearing ............................................................................................ 45 Experimental design........................................................................................ 45 Laser Doppler vibrometry ............................................................................... 46 Signal analysis ................................................................................................. 47 Data analyses................................................................................................... 49 6.3 Results ........................................................................................................... 51 Frequency domain of vibratory signals........................................................... 51 Time domain of vibratory signals.................................................................... 53 6.4 Discussion ...................................................................................................... 54 7. Body temperature of the parasitic wasp Pimpla turionellae (L.) (Hym.) during host location by vibrational sounding4 ................................................................... 59 Abstract................................................................................................................ 59 7.1 Introduction ................................................................................................... 60 7.2 Material and methods ................................................................................... 62 Parasitoid rearing ............................................................................................ 62 Experimental set-up ........................................................................................ 62 Behaviour on plant-stem model ...................................................................... 64 Data analysis ................................................................................................... 65 7.3 Results ........................................................................................................... 66 Body temperature of the parasitoids............................................................... 66 Host location behaviour on the plant-stem model.......................................... 69 7.4 Discussion ...................................................................................................... 71 8. Temperature affects interaction of visual and vibrational cues in parasitoid host location5 ........................................................................................................... 75 Abstract................................................................................................................ 75 8.1 Introduction ................................................................................................... 75 5 8.2 Material and methods ................................................................................... 77 Parasitoid rearing ............................................................................................ 77 Experimental set-up ........................................................................................ 78 Data analysis ................................................................................................... 79 8.3 Results ........................................................................................................... 80 Responsiveness ................................................................................................ 80 Relative importance of cues............................................................................. 82 Overall precision and insertion activity.......................................................... 82 8.4 Discussion ...................................................................................................... 84 9. General Discussion ............................................................................................. 89 Temperature range of using vibrational sounding ............................................ 89 How to cope with thermal changes..................................................................... 91 Role of vibrational cue in multisensory orientation........................................... 93 10. References.......................................................................................................... 95 11. Acknowledgements.......................................................................................... 107 12. Curriculum vitae............................................................................................. 109 _____________________________________ 1Samietz, J., Kroder, S., Schneider, D. & Dorn, S. (2006) Ambient temperature affects mechanosensory host location in a parasitic wasp. Journal of Comparative Physiology A, 192: 151-157. 2Kroder, S., Samietz, J. & Dorn, S. (2006) Effect of ambient temperature on mechanosensory host location in two parasitic wasps of different climatic origin.