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Voltinism-associated differences in winter survival across latitudes: integrating growth, physiology, and food intake

  • Physiological ecology - original research
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Abstract

Species that span large latitudinal gradients face strong differences in voltinism and in winter conditions within their range. Latitudinal gradients in winter survival and especially their underlying mechanisms and association with voltinism patterns are poorly studied. We tested in the damselfly Enallagma cyathigerum whether high-latitude populations were better in dealing with the longer winters compared to central- and low-latitude populations and whether this was associated with changes in voltinism. We thereby evaluated whether higher initial levels and/or lower reductions during winter of energy storage (measured as fat content) and investment in immune function [measured as the activity of phenoloxidase (PO)], and/or stronger compensatory responses in food intake contributed to the higher winter survival in high-latitude populations. To this end, we simulated a long high-latitude winter at 4 °C under manipulated food conditions. Across food levels, winter survival was highest in Swedish larvae, intermediate in Belgian larvae, and lowest in Spanish larvae, indicating latitude-specific thermal adaptation that could be partly linked to differences in voltinism. The semi-voltine Swedish larvae were growing slower before winter and as a result accumulated the highest fat content and PO activity when the winter started compared to the univoltine, faster growing Belgian, and Spanish larvae. Fat content and PO activity declined during the winter, yet equally across latitudes, and were not buffered by compensatory food intake. Our data identified possible underlying physiological mechanisms of winter survival and support the hypothesis that widespread latitude-associated voltinism shifts may be a selective factor contributing to latitudinal shifts in winter survival.

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Acknowledgements

We thank Adolfo Cordero and Frank Johansson for collecting damselfly eggs, Ria Van Houdt for the physiological analyses, and Geert Neyens and Rony Van Aerschot for giving technical support. Comments by Lin Op De Beeck, David Chalcraft, and two anonymous reviewers helped us to improve the manuscript. JV is a PhD fellow of the FWO, Flanders. Financial support came from research grants by FWO (G.0704.13 and G.0524.17) and the KU Leuven (PF/2010/07 and C16/17/002).

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Contributions

MDB and RS conceived and designed the experiments. KT and MDB performed the experiments. JV analyzed the data. JV and RS wrote the manuscript; other authors provided editorial advice.

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Correspondence to Julie Verheyen.

Additional information

Communicated by David Chalcraft.

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Online Resource 1.

Overview of the applied photoperiod and temperature treatments during the experiment (DOCX 16 kb)

Online Resource 2.

Results larval head width (DOCX 48 kb)

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Verheyen, J., Temmerman, K., De Block, M. et al. Voltinism-associated differences in winter survival across latitudes: integrating growth, physiology, and food intake. Oecologia 186, 919–929 (2018). https://doi.org/10.1007/s00442-018-4079-5

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  • DOI: https://doi.org/10.1007/s00442-018-4079-5

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