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Tangled Web Of The Insect, Plant And Parasite Arms Race

Date:
November 3, 2007
Source:
BioMed Central
Summary:
New insights have been made into the evolutionary relationship between plant-dwelling insects and their parasites. Researchers shed light on how sawflies evolved to escape their parasites and gain themselves an 'enemy-free space' for millions of years.

New insights into the evolutionary relationship between plant-dwelling insects and their parasites are revealed in the online open access journal BMC Biology. Researchers shed light on how sawflies evolved to escape their parasites and gain themselves an 'enemy-free space' for millions of years.

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Tommi Nyman of the University of Joensuu in Finland together with colleagues from Sweden and Germany uncovered a food web involving willow trees, sawflies, and the parasites feeding on sawfly larvae. Sawflies (a group of insects related to bees and wasps) lay their larvae in willows creating galls, which are protruding growths of plant tissue. Nyman's group used data from galls collected from willows over an 18-year period. They classified 43 sawfly species using genetic analysis and assessed the degree of parasitism to which these insects had been subjected by 72 different parasites.

Their statistical analysis showed that parasitism promotes the insects' ecological divergence in a co-evolutionary arms race. The sawflies develop new gall-types and, in doing so, can escape the attentions of the parasites without having to switch host plant. Some parasites, however, have in turn adapted to the divergence in gall-types, driving further speciation. These processes partly explain the unusual diversity of herbivorous insects and their parasitoids.

This study is the first time that key co-evolutionary hypotheses such as the classic Escape-And-Radiate (EAR) hypothesis have been tested in a phylogenetic framework. EAR suggests that hyper diverse communities result from co-evolutionary arms races featuring cycles of enemy escape, radiation, and colonization by new enemy lineages. The results show that the EAR hypothesis is too simplistic to be applied to complex species-rich food webs.

"Our results indicate that niche-dependent parasitism is a major force promoting ecological divergence in herbivorous insects," says Nyman. "Diversification seems to be spurred by a continuous stepwise process, in which ecological and phenotypic shifts in prey lineages are followed by a lagged evolutionary response by some of the associated enemies."

Journal article: Tommi Nyman, Folmer Bokma and Jens-Peter Kopelke "Reciprocal diversification in a complex plant-herbivore-parasitoid food web" BMC Biology (in press)


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The above story is based on materials provided by BioMed Central. Note: Materials may be edited for content and length.


Cite This Page:

BioMed Central. "Tangled Web Of The Insect, Plant And Parasite Arms Race." ScienceDaily. ScienceDaily, 3 November 2007. <www.sciencedaily.com/releases/2007/11/071101085033.htm>.
BioMed Central. (2007, November 3). Tangled Web Of The Insect, Plant And Parasite Arms Race. ScienceDaily. Retrieved December 18, 2014 from www.sciencedaily.com/releases/2007/11/071101085033.htm
BioMed Central. "Tangled Web Of The Insect, Plant And Parasite Arms Race." ScienceDaily. www.sciencedaily.com/releases/2007/11/071101085033.htm (accessed December 18, 2014).

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