Increased chemical resistance explains low herbivore colonization of introduced seaweed

Oecologia
Sofia A WikströmHenrik Pavia

Abstract

The success of introduced species is often attributed to release from co-evolved enemies in the new range and a subsequent decreased allocation to defense (EICA), but these hypotheses have rarely been evaluated for systems with low host-specificity of enemies. Here, we compare herbivore utilization of the brown seaweed, Fucus evanescens, and its coexisting competitors both in its native and new ranges, to test certain predictions derived from these hypotheses in a system dominated by generalist herbivores. While F. evanescens was shown to be a preferred host in its native range, invading populations supported a less diverse herbivore fauna and it was less preferred in laboratory choice experiments with important herbivores, when compared to co-occurring seaweeds. These results are consistent with the enemy release hypothesis, despite the fact that the herbivore communities in both regions were mainly composed of generalist species. However, in contrast to the prediction of EICA, analysis of anti-grazing compounds indicated a higher allocation to defense in introduced compared to native F. evanescens. The results suggest that the invader is subjected to less intense enemy control in the new range, but that this is due to an incr...Continue Reading

References

Jul 29, 1996·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·D G ReidR H Thomas
May 17, 2006·Trends in Ecology & Evolution·Heinz Müller-SchärerThomas Steinger
Mar 1, 1989·Oecologia·C H Peterson, P E Renaud
Jan 1, 1995·Journal of Chemical Ecology·K L van Alstyne

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Citations

Jul 30, 2008·Natural Product Reports·Valerie J Paul, Raphael Ritson-Williams
Jun 15, 2011·Ecology·Urs SchaffnerRagan M Callaway
Nov 28, 2007·Evolution; International Journal of Organic Evolution·Alistair G B PooreErik E Sotka
Apr 19, 2015·Marine Environmental Research·Fabio Bulleri, Francesco Malquori
Apr 9, 2011·Phytochemistry Reviews : Proceedings of the Phytochemical Society of Europe·Leonie J Doorduin, Klaas Vrieling

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