Original article

Behavioral Ecology and Sociobiology

, Volume 43, Issue 4, pp 301-306

First online:

High relatedness and inbreeding in two species of haplodiploid eusocial thrips (Insecta: Thysanoptera) revealed by microsatellite analysis

  • Thomas W. ChapmanAffiliated withDepartment of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, V5A 1S6, Canada e-mail: thomaswi@sfu.ca, Tel.: +1-604-2915625, Fax: +1-604-2913496
  • , Bernard CrespiAffiliated withDepartment of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, V5A 1S6, Canada e-mail: thomaswi@sfu.ca, Tel.: +1-604-2915625, Fax: +1-604-2913496

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Abstract

Relatedness and inbreeding coefficients were estimated for Oncothrips tepperi and O. habrus, two species of eusocial gall-forming thrips, using data from two microsatellite loci. Relatedness between sets of individuals (sexes and castes) for O. tepperi ranged from 0.5 to 0.85 and for O. habrus estimates were centered around 0.5. Multiple mating in O. habrus was implicated in lowering relatedness within a gall. We estimated the inbreeding coefficient to be 0.38 for both species, the highest estimates known for eusocial insects. Our findings imply that high relatedness and inbreeding are important for the evolution and form of social behavior in Australian gall-forming Thysanoptera.

Key words Social behavior Sib-mating Effective number of mates Soldier caste