Abstract
Recognition of relatives is considered a key factor in the evolution of sociality as it ensures that the benefits of altruism flow to those who share the altruist's genes. However, theory predicts that genetically based recognition systems will not persist if the only selection maintaining them derives from the recognition system itself. Kin-recognition systems, therefore, are hypothesized to involve genetic variation maintained by other functions. Polyembryonic wasps are parasites of moth larvae that clonally produce large numbers of offspring and two morphologically distinct castes. Some embryos develop into reproductive larvae that mature into adult wasps, whereas others develop into soldier larvae whose function is defence. Soldiers from Copidosoma floridanum distinguish relatives from non-relatives on the basis of relatedness. Here, we report that the recognition cues used by soldiers derive from the extraembryonic membrane, which also protects these parasites from the host's immune response. This suggests that the kin-recognition system used by C. floridanum may be maintained in part by selection for resistance against the host.
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Selected References
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- Atkinson Peter W. Genetic engineering in insects of agricultural importance. Insect Biochem Mol Biol. 2002 Oct;32(10):1237–1242. doi: 10.1016/s0965-1748(02)00086-3. [DOI] [PubMed] [Google Scholar]
- Corley Laura S., Strand Michael R. Evasion of encapsulation by the polyembryonic parasitoid Copidosoma floridanum is mediated by a polar body-derived extraembryonic membrane. J Invertebr Pathol. 2003 May;83(1):86–89. doi: 10.1016/s0022-2011(03)00041-7. [DOI] [PubMed] [Google Scholar]
- Grosberg R. K., Hart M. W. Mate selection and the evolution of highly polymorphic self/nonself recognition genes. Science. 2000 Sep 22;289(5487):2111–2114. doi: 10.1126/science.289.5487.2111. [DOI] [PubMed] [Google Scholar]
- Harvey J. A., Corley L. S., Strand M. R. Competition induces adaptive shifts in caste ratios of a polyembryonic wasp. Nature. 2000 Jul 13;406(6792):183–186. doi: 10.1038/35018074. [DOI] [PubMed] [Google Scholar]
- Queller D. C. Relatedness and the fraternal major transitions. Philos Trans R Soc Lond B Biol Sci. 2000 Nov 29;355(1403):1647–1655. doi: 10.1098/rstb.2000.0727. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Stoner D. S., Weissman I. L. Somatic and germ cell parasitism in a colonial ascidian: possible role for a highly polymorphic allorecognition system. Proc Natl Acad Sci U S A. 1996 Dec 24;93(26):15254–15259. doi: 10.1073/pnas.93.26.15254. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Strand M. R., Grbic M. The development and evolution of polyembryonic insects. Curr Top Dev Biol. 1997;35:121–159. doi: 10.1016/s0070-2153(08)60258-6. [DOI] [PubMed] [Google Scholar]