Geographic patterns of herbivory and resource allocation to defense, growth, and reproduction in an invasive biennial, Alliaria petiolata

Oecologia
Kristin C LewisColin M Orians

Abstract

We investigated geographic patterns of herbivory and resource allocation to defense, growth, and reproduction in an invasive biennial, Alliaria petiolata, to test the hypothesis that escape from herbivory in invasive species permits enhanced growth and lower production of defensive chemicals. We quantified herbivore damage, concentrations of sinigrin, and growth and reproduction inside and outside herbivore exclusion treatments, in field populations in the native and invasive ranges. As predicted, unmanipulated plants in the native range (Hungary, Europe) experienced greater herbivore damage than plants in the introduced range (Massachusetts and Connecticut, USA), providing evidence for enemy release, particularly in the first year of growth. Nevertheless, European populations had consistently larger individuals than US populations (rosettes were, for example, eightfold larger) and also had greater reproductive output, but US plants produced larger seeds at a given plant height. Moreover, flowering plants showed significant differences in concentrations of sinigrin in the invasive versus native range, although the direction of the difference was variable, suggesting the influence of environmental effects. Overall, we observed l...Continue Reading

References

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Citations

Sep 28, 2010·Journal of Chemical Ecology·Josep PeñuelasU Niinemets
Mar 28, 2013·Ambio·Tina HegerJonathan M Jeschke
Feb 2, 2008·Proceedings of the National Academy of Sciences of the United States of America·A R ZangerlM R Berenbaum
Sep 10, 2009·Annual Review of Entomology·Colin M Orians, David Ward
Apr 9, 2011·Phytochemistry Reviews : Proceedings of the Phytochemical Society of Europe·Leonie J Doorduin, Klaas Vrieling
Oct 3, 2021·G3 : Genes - Genomes - Genetics·Nikolay AlabiRobert I Colautti

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