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Psyche
Volume 2012 (2012), Article ID 398061, 10 pages
http://dx.doi.org/10.1155/2012/398061
Research Article

Intraspecific and Intracolonial Variation in the Profile of Venom Alkaloids and Cuticular Hydrocarbons of the Fire Ant Solenopsis saevissima Smith (Hymenoptera: Formicidae)

1Laboratório de Entomologia Médica e Molecular, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro (IBCCF/UFRJ), Rio de Janeiro, RJ, Brazil
2Instituto de Quimica, Universidade Estadual de Campinas (IQ/UNICAMP), 13083-862 Campinas, SP, Brazil
3Instituto de Biociencias, Universidade Estadual Paulista (UNESP), Campus de Rio Claro and Centro de Estudos de Insetos Sociais (CEIS), 13506-900 Rio Claro, SP, Brazil
4Laboratório de Mirmecologia, Centro de Pesquisas do Cacau (CEPLAC), Itabuna, BA, Brazil
5Laboratório de Tecido Conjuntivo, Instituto de Bioquímica Médica, UFRJ, RJ, Brazil

Received 13 October 2011; Revised 18 January 2012; Accepted 3 February 2012

Academic Editor: Michael Rust

Copyright © 2012 Eduardo Gonçalves Paterson Fox et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fire ants are aggressive Neotropical ants that are extensively similar in general biology and morphology, making species identification difficult. Some fire ant species are top-rated pests spreading throughout the world by trade vessels. Many researchers attempted to sort between invasive and native species by using chemical characters, including patterns of venom alkaloids. The present study is the first to report intraspecific variation in some chemical characters, namely, cuticular hydrocarbons and venom alkaloids, within the Brazilian fire ant species Solenopsis saevissima and also reports on within-nest variations among members of different castes. Two different haplotypes (cryptic species) of S. saevissima were clearly identified, one presenting a predominant combination of the venom alkaloids cis- and trans-2-methyl-6-undecylpiperidine with the cuticular hydrocarbons C23, 3-Me-C23, 10-C25 : 1, C25, and 3-Me-C25, and the other a predominant combination of cis- and trans-2-methyl-6-tridecenylpiperidine with predominance of 12-C25 : 1, C25, 11-Me-C25, 3-Me-C25, 13-C27 : 1, C27, and 13-Me-C27. Intranest variations revealed that the proportions among these compounds varied sensibly among workers of different sizes, gynes, and males (no alkaloids were detected in the latter). Larva contained vestiges of the same compounds. The recorded chemical profiles are quite different from previous reports with S. saevissima samples from São Paulo. The finds thus support other recent claims that S. saevissima includes cryptic species; the study, moreover, adds the find that they can occur in the same geographical location.