Effects of large-scale wildfire on ground foraging ants (Hymenoptera: Formicidae) in southern California

Environmental Entomology
By: , and 



We investigated the effect of broad-scale wildfire on ground foraging ants within southern California. In October and November of 2003, two wildfires burned large portions of the wildlands within San Diego County. Between January 2005 and September 2006, we surveyed 63 plots across four sites to measure the effect of the fires on the ant assemblages present in four vegetation types: 1) coastal sage scrub, 2) chaparral, 3) grassland, and 4) woodland riparian. Thirty-six of the 63 plots were sampled before the fires between March 2001 and June 2003. Mixed model regression analyses, accounting for the burn history of each plot and our pre- and postfire sampling efforts, revealed that fire had a negative effect on ant species diversity. Multivariate analyses showed that ant community structure varied significantly among the four vegetation types, and only the ant assemblage associated with coastal sage scrub exhibited a significant difference between burned and unburned samples. The most notable change detected at the individual species level involved Messor andrei (Mayr), which increased from <1% of prefire coastal sage scrub ant samples to 32.1% in burned plots postfire. We theorize that M. andrei responded to the increase of bare ground and postfire seed production, leading to an increase in the detection rate for this species. Collectively, our results suggest that wildfires can have short-term impacts on the diversity and community structure of ground foraging ants in coastal sage scrub. We discuss these findings in relation to management implications and directions for future research.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Effects of large-scale wildfire on ground foraging ants (Hymenoptera: Formicidae) in southern California
Series title Environmental Entomology
DOI 10.1603/EN10061
Volume 40
Issue 2
Year Published 2011
Language English
Publisher Entomological Society of America
Contributing office(s) Western Ecological Research Center
Description 13 p.
First page 204
Last page 216
Time Range Start 2003-10-01
Time Range End 2006-09-30
Country United States
State California
County San Diego County
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