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1 November 2015 Pre- and Postzygotic Barriers to Reproduction Between Two Host-Foodplant Complex Sources of the Parasitic Wasp, Cotesia congregata (Hymenoptera: Braconidae)
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Abstract

Parasitic wasps are among the most speciose of all animals yet the drivers and mechanisms underlying their remarkable diversity are not well understood. Cotesia congregata (Say) and host, Manduca sexta (L.), have long-served as a model system for host-parasite and tritrophic interactions at multiple levels, as well as the evolution of symbiotic coevolved bracoviruses that suppress host defenses to parasitism. We investigated potential barriers to reproduction between two genetically differentiated host-foodplant complex sources of C. congregata originating from caterpillar hosts, M. sexta on tobacco (“MsT wasps”) or Ceratomia catalpae (Boisduval) on catalpa (“CcC wasps”). Both MsT and CcC wasps displayed ∼30% lower responses to cuticular washes of females from the alternate complex. Male courtship songs differed with respect to frequency, absolute amplitude, and duration of song elements. Despite differences in courtship behaviors, MsT and CcC wasps mated and produced offspring in the laboratory. However, mating success of F1 MsT♂ × CcC♀ wasps was lower and fitness of F1 CcC♂×MsT♀ hybrids was greatly reduced due to encapsulation and melanization of wasp eggs in M. sexta. Heritable differences in brood size and secondary sex ratios of emergent adults indicate hostspecific adaptations. Overall, results demonstrate the evolution and accumulation of both pre- and postzygotic barriers to reproduction, two of which are asymmetrical, and offer additional support that MsT and CcC wasp are incipient species.

© The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com
J. P. Bredlau and K. M. Kester "Pre- and Postzygotic Barriers to Reproduction Between Two Host-Foodplant Complex Sources of the Parasitic Wasp, Cotesia congregata (Hymenoptera: Braconidae)," Annals of the Entomological Society of America 108(6), 1026-1036, (1 November 2015). https://doi.org/10.1093/aesa/sav089
Received: 31 December 2014; Accepted: 19 August 2015; Published: 1 November 2015
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