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Wolbachia impairs post-eclosion host preference in a parasitoid wasp.

Pouria Abrun1, Ahmad Ashouri1, Anne Duplouy2,3

  • 1Department of Plant Protection, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.

Die Naturwissenschaften
|March 24, 2021
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Summary

Wolbachia infection impairs host preference in the parasitoid wasp Trichogramma brassicae, leading to increased host switching. This bacterial symbiont also enhances wasp emergence rates on novel hosts, impacting evolutionary dynamics.

Keywords:
Hopkin’s host-selection principleHost preferenceParasitoidSymbiont

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Area of Science:

  • Behavioral Ecology
  • Insect-Microbe Interactions
  • Evolutionary Biology

Background:

  • Host selection is crucial for individual fitness and can be influenced by developmental history.
  • Hopkin's host-selection principle (HHSP) describes a preference for natal hosts in higher trophic levels.
  • The impact of selfish endosymbionts on host preference remains largely unexplored.

Purpose of the Study:

  • To investigate the effect of Wolbachia infection on the post-eclosion host preference of the parasitoid wasp Trichogramma brassicae.
  • To determine if Wolbachia influences host switching behavior and emergence rates in T. brassicae.

Main Methods:

  • Comparison of host preference between Wolbachia-infected and uninfected T. brassicae females.
  • Experimental design included choice and no-choice assays using two Lepidopteran host species: Ephestia kuehniella and Sitotroga cerealella.
  • Assessment of emergence rates of wasps reared on different hosts.

Main Results:

  • Wolbachia-infected T. brassicae females exhibited no significant host preference and switched hosts more frequently.
  • Uninfected wasps showed a strong preference for their natal host species.
  • Wolbachia infection significantly increased the emergence rate of wasps on novel host species.

Conclusions:

  • Wolbachia infection impairs post-eclosion host preference in T. brassicae.
  • This impairment facilitates host shifting, potentially conferring adaptive advantages for both the wasp and its symbiont.
  • The findings suggest significant evolutionary consequences for host-symbiont interactions and population dynamics.