Novel antagonistic interactions associated with plant polyploidization influence trait selection and habitat preference

Ecology Letters
Leena ArvanitisJohan Ehrlén

Abstract

Polyploidization is an important mechanism for sympatric speciation in plants. Still, we know little about whether plant polyploidization leads to insect host shifts, and if novel interactions influence habitat and trait selection in plants. We investigated herbivory by the flower bud gall-forming midge Dasineura cardaminis on tetraploids and octoploids of the herb Cardamine pratensis. Gall midges attacked only octoploid plant populations, and a transplantation experiment confirmed this preference. Attack rates were higher in populations that were shaded, highly connected or occurred along stream margins. Within populations, late-flowering individuals with many flowers were most attacked. Galling reduced seed production and significantly influenced phenotypic selection on flower number. Our results suggest that an increase in ploidy may lead to insect host shifts and that plant ploidy explains insect host use. In newly formed plant polyploids, novel interactions may alter habitat preferences and trait selection, and influence the further evolution of cytotypes.

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Citations

Jan 5, 2011·Gastroenterology Research and Practice·Olivier Molendi-CosteIsabelle A Leclercq
Feb 5, 2014·Oecologia·Malin A E KönigJohan Ehrlén
Jun 25, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Justin Ramsey, Tara S Ramsey
Sep 3, 2011·Journal of Economic Entomology·Kirk M AndersonMarion O Harris
Dec 16, 2011·Journal of Evolutionary Biology·A BurkhardtG Bernasconi
Jul 4, 2015·Ecology and Evolution·Malin A E KönigJohan Ehrlén
Jul 3, 2016·American Journal of Botany·Kari A Segraves, Thomas J Anneberg
Oct 30, 2016·American Journal of Botany·Adrian F Powell, Jeff J Doyle
Sep 20, 2019·Journal of Biogeography·Timothy K O'ConnorNoah K Whiteman

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