Abstract
Photoperiodic phenological adaptations are prevalent in many organisms living in seasonal environments. As both photoperiod and growth season length change with latitude, species undergoing latitudinal range expansion often need to synchronize their life cycle with a changing photoperiod and growth season length. Since adaptive synchronization often involves a large number of time-consuming genetic changes, behavioural plasticity might be a faster way to adjust to novel conditions. We compared behavioural and physiological traits in overwintering (diapause) preparation in three latitudinally different European Colorado potato beetle (Leptinotarsa decemlineata) populations reared under two photoperiods. Our aim was to study whether behavioural plasticity could play a role in rapid range expansion into seasonal environments. Our results show that while burrowing into the soil occurred in the southernmost studied population also under a non-diapause-inducing long photoperiod, the storage lipid content of these beetles was very low compared to the northern populations. However, similar behavioural plasticity was not found in the northern populations. Furthermore, the strongest suppression of energy metabolism was seen in pre-diapause beetles from the northernmost population. These results could indicate accelerated diapause preparation and possibly energetic adjustments due to temporal constraints imposed by a shorter, northern, growth season. Our results indicate that behavioural plasticity in burrowing may have facilitated initial range expansion of L. decemlineata in Europe. However, long-term persistence at high latitudes has required synchronization of burrowing behaviour with physiological traits. The results underline that eco-physiological life-history traits of insects, such as diapause, should be included in studies on range expansion.
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Acknowledgments
We thank Alessandro Grapputo and Magdalena Szuplewska for providing beetles, Aigi Margus for sample analysis and Tanja Heikkilä for help with the rearing of the beetles. Karl Gotthard, Thomas Flatt, Daniel Hahn and anonymous reviewers are thanked for making valuable comments to improve this manuscript. This work was financed by The Academy of Finland: project numbers 250248, 263742 and 252411 (Finnish Centre of Excellence in Biological Interactions Research). L. decemlineata is a quarantine species in Finland, and therefore this experiment was carried out under permission (Evira 3861/541/2007).
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Communicated by Sylvain Pincebourde.
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Lehmann, P., Lyytinen, A., Piiroinen, S. et al. Northward range expansion requires synchronization of both overwintering behaviour and physiology with photoperiod in the invasive Colorado potato beetle (Leptinotarsa decemlineata). Oecologia 176, 57–68 (2014). https://doi.org/10.1007/s00442-014-3009-4
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DOI: https://doi.org/10.1007/s00442-014-3009-4