Each individual of all populations of the thelytokous species Trichogramma cordubensis is infected by Wolba! chia[ Populations are composed of females\ a few rare males and some intersexual or gynandromorphic individuals often capable of normal reproduction as females[ Antibiotic "minocycline# and high temperature "29>C# treatments inactivate Wolbachia and induce male production[ After these treatments\ the sex ratio depending on the remaining frequency of thelytoky shows a genetic variability[ E}ect of cycles with and without treatments "minocycline or 29>C# on the thelytokous reproduction of {individuals| "one {individual| being one Trichogramma ¦n Wolbachia# was studied[ The resistance of thelytokous reproduction to 29>C but not to minocycline\ probably due to Wolbachia genes\ increased[ It is concluded that potentialities of adaptation to high temperature exist in Wolbachia and can explain a part of the spreading of these symbionts among host populations[
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