University of Groningen
Latitudinal differences in the circadian system of Nasonia vitripennis Floessner, Theresa
DOI:
10.33612/diss.102037680
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Publication date: 2019
Link to publication in University of Groningen/UMCG research database
Citation for published version (APA):
Floessner, T. (2019). Latitudinal differences in the circadian system of Nasonia vitripennis. University of Groningen. https://doi.org/10.33612/diss.102037680
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Proposition accompanying the PhD thesis:
Latitudinal differences in the circadian system of Nasonia vitripennis
Theresa Sophie Elisabeth Flößner
1. Variation in circadian free-running period in Nasonia vitripennis is necessary for adaptation of seasonal diapause induction to different latitudes (Chapter 2).
2. The circadian clock of northern Nasonia lines is more light sensitive to maintain daily circadian organisation under long natural photoperiods using strong light resetting (Chapter 3).
3. Lack of reduced longevity in Nasonia under extreme τ/T ratios is a direct result of strong circadian light resetting (Chapter 2).
4. There is no indication that Nasonia vitripennis’ circadian system resets through immediate early gene induction of per or any of the other clock genes tested (Chapter 5). 5. The external coincidence model, involving a single oscillator with a light sensitive phase, can explain differences in photoperiod induced diapause between the northern and southern lines (Chapter 4).
6. The steeper phase-period slope of wasps from the southern line compared to the northern line explains their reduced response to different photoperiod / T-cycle combinations (Chapter 4).
