Biological Invasions (2010) 12, 3307-3318
Chin-Cheng Yang, Yi-Chih Yu, Steven M. Valles, David H. Oi, Yin-Cheng Chen, DeWayne Shoemaker, Wen-Jer Wu and Cheng-Jen Shih (2010)
Loss of microbial (pathogen) infections associated with recent invasions of the red imported fire ant Solenopsis invicta
Biological Invasions 12 (9), 3307-3318
Abstract: Loss of natural enemies during colonization is a prominent hypothesis explaining enhanced performance of invasive species in introduced areas. Numerous studies have tested this enemy release hypothesis in a wide range of taxa but few studies have focused on invasive ants. We conducted extensive surveys for the presence of six microbes in recently established populations (California, Australia, New Zealand, Taiwan, and China) of the invasive fire ant Solenopsis invicta. These microbes include Wolbachia, two microsporidia (Kneallhazia solenopsae and Vairimorpha invictae) and three RNA viruses (SINV-1, -2 and -3), all of which previously have been reported in native South American populations of S. invicta. These surveys showed that the total number of enemy species is lower in the recently invaded areas compared with both South American and US populations. Only two microbes were found in any of these recently invaded areas: SINV-1 was detected in all surveyed populations except Australia and New Zealand, and SINV-2 was detected in California and Taiwan only. These results support the general prediction that invasive species lose many of their natural enemies during invasion. Further, the conspicuous absence of some of these microbes in these areas may result from strong selection against founders due to fitness costs associated with harboring detrimental infections rather than the alternative hypothesis that they simply were absent among the original founders. While the successful invasion of S. invicta in these recently invaded areas may be explained partly by the absence of natural enemies, other factors likely have been important as well.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Steven M. Valles, Wen-Jer Wu, David H. Oi
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation
