1. Laboratory of Socioecology and Social Evolution, Zoological Institute, University of Leuven, Naamsestraat 59—Box 2466, 3000 Leuven, Belgium.
2. Division of Ecology, Evolution, and Genetics, Research School of Biology, Australian National University, Canberra, ACT 0200, Australia.
3. Departments of Entomology and Chemistry, University of California, Riverside, CA 92521, USA.
4. Laboratory of Experimental and Comparative Ethology (LEEC), University of Paris 13, Sorbonne Paris Cité, 93430 Villetaneuse, France.
5. Centre for Food and Microbial Technology, Department of Microbial and Molecular Systems (MS), University of Leuven, Kasteelpark Arenberg 33—Box 2463, 3001 Heverlee, Belgium.
6. Lancaster Environment Centre, Farrer Avenue, Lancaster, Lancashire LA1 4YQ, UK.