Journal
ECOLOGY LETTERS
Volume 13, Issue 11, Pages 1368-1377Publisher
WILEY
DOI: 10.1111/j.1461-0248.2010.01529.x
Keywords
Coevolution; geographic mosaic; multispecific interactions; mutualism; pollination
Categories
Funding
- Direct For Biological Sciences [839853] Funding Source: National Science Foundation
- Division Of Environmental Biology [839853] Funding Source: National Science Foundation
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P>A current challenge in coevolutionary biology is to understand how interactions between pairs of species change as they diversify into multispecific interactions. We tested whether the previously demonstrated pairwise mutualism between the widespread pollinating floral parasite Greya politella and its Lithophragma hostplants is ecologically enhanced or diminished in a region in which another Greya species, Greya obscura, uses the same host, Lithophragma cymbalaria. Field surveys and experimental trials showed that pollination efficacy by G. politella was more than an order of magnitude higher than by G. obscura, but G. politella abundance varied greatly between years. Greya obscura had a strongly positive effect on seed set in a year when G. politella densities were exceptionally low. Our results suggest that the coevolving mutualism between Greya and Lithophragma has potentially been enhanced rather than diminished as this interaction has diversified in the number of pollinating Greya species.
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