Technical Comments

Comment on “The hologenomic basis of speciation: Gut bacteria cause hybrid lethality in the genus Nasonia

Science  29 Aug 2014:
Vol. 345, Issue 6200, pp. 1011
DOI: 10.1126/science.1251997

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Brucker and Bordenstein (Reports, 9 August 2013, p. 667) claim that adaptive codivergence of gut bacteria with hosts contributes to hybrid lethality. Yet, they provide no evidence for coadaptation of bacteria and Nasonia hosts. Their data on hybrid viability suggest that bacteria contribute to inviability only because intrinsic hybrid dysfunction increases susceptibility to free-living bacteria. Hologenomic speciation remains testable speculation without experimental support.

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