Introduced Brassica nigra populations exhibit greater growth and herbivore resistance but less tolerance than native populations in the native range
Article first published online: 15 MAR 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 191, Issue 2, pages 536–544, July 2011
How to Cite
Oduor, A. M.O., Lankau, R. A., Strauss, S. Y. and Gómez, J. M. (2011), Introduced Brassica nigra populations exhibit greater growth and herbivore resistance but less tolerance than native populations in the native range. New Phytologist, 191: 536–544. doi: 10.1111/j.1469-8137.2011.03685.x
- Issue published online: 29 JUN 2011
- Article first published online: 15 MAR 2011
- Received: 8 November 2010, Accepted: 1 February 2011
- Brassica nigra;
- enemy release hypothesis;
- evolution of increased competitive ability;
- invasive species;
- shifting defence hypothesis;
- •Rapid post-introduction evolution has been found in many invasive plant species, and includes changes in defence (resistance and tolerance) and competitive ability traits. Here, we explored the post-introduction evolution of a trade-off between resistance to and tolerance of herbivory, which has received little attention.
- •In a common garden experiment in a native range, nine invasive and 16 native populations of Brassica nigra were compared for growth and defence traits.
- •Invasive populations had higher resistance to, but lower tolerance of, herbivore damage than native populations. Invasive populations survived better and produced more seeds than native ones when released from herbivores; but fitness was equivalent between the regions under ambient herbivory. The invasive populations grew taller, and produced more biomass and lighter seeds than natives, irrespective of insecticide treatment.
- •In addition to supporting the idea of post-introduction rapid evolution of plant traits, our results also contribute to an emerging pattern of both increasing resistance and growth in invasive populations, contrary to the predictions of earlier theories of resistance–growth trade-offs.