Analysis
The multivariate technique of Detrended Correspondence Analysis (DCA) was used to discriminate among study sites and sampling methods on the basis of ant species presenceabsence data, with the PC-ORD program. We included in our analysis only those ant species that were found in more than four of the seven sampling events (see list of ant species and frequency in electronic Appendix 1). Data were entered separately for each species at each site and with each sampling method.