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Does range expansion modify trait covariation? A study of a northward expanding dragonfly

  • Global change ecology – original research
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Abstract

The adaptive value of correlations among phenotypic traits depends on the prevailing environmental conditions. Differences in selection pressures during species range expansions may therefore shape phenotypic integration. In this study, we assessed variation in behavioral and morphological traits, as well as their covariations, in replicated southern and northern European populations of the northward expanding dragonfly Crocothemis erythraea. Larvae from northern populations were, on average, darker in color, and therefore, better camouflaged than larvae from southern populations. However, there was no difference in activity level. Darkness and activity were positively correlated in larvae from northern populations, whereas this trait covariation was missing in southern populations. This suggests the emergence of alternative strategies in time-limited northern populations, a higher activity level that required better camouflage through darker coloration, while less active larvae benefited from an energy-saving strategy by reducing the investment in costly traits, such as body darkness. We further found that larger larvae emerged into larger adults, with a higher investment in flight morphology. Our findings imply that phenotypic integration is associated with the northward range shift, potentially differentially shaping fitness consequences, and ecological interactions in southern versus northern populations.

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Acknowledgements

We kindly thank the people that guided us to populations and helped collecting the samples: Yohan Morizet, Philippe Lambret, Charlotte Sohier, Hajnalka Gyulavári, Diana Goertzen and Frank Suhling. ANB-Belgium, Indre Nature, Grand Port Maritime de Marseille and Département Environnement et Aménagement provided permission and access to populations. This study is part of the project PROBIS (Biodiversa) and financially supported by ONEMA, DFG and SEPA. JC is supported by an ANR-12-JSV7-0004-01. JC and SB are part of the Laboratoire d’Excellence (LABEX) entitled TULIP (ANR-10-LABX-41).

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Contributions

LT, FF, SB and JC conceived and designed the experiment. LT, FF and KK conducted fieldwork and performed the experiment. LT and AR analyzed the data with input from SB and JC. LT wrote the first draft, AR wrote the revised version and all authors contributed to these versions.

Corresponding author

Correspondence to Allan Raffard.

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All applicable institutional and/or national guidelines for the care and use of animals were followed.

Conflict of interest

The authors declare they have no conflict of interest.

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Communicated by Thomas S. Hoffmeister.

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Raffard, A., Therry, L., Finn, F. et al. Does range expansion modify trait covariation? A study of a northward expanding dragonfly. Oecologia 192, 565–575 (2020). https://doi.org/10.1007/s00442-020-04592-1

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  • DOI: https://doi.org/10.1007/s00442-020-04592-1

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