ECOLOGY AND POPULATION BIOLOGY Assessments of Fitness Effects by the Facultative Symbiont Rickettsia in the Sweetpotato Whitefly (Hemiptera: Aleyrodidae)
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چکیده
The sweet potato whiteßy, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), harbors several bacterial symbionts, including the obligate primary symbiont Portiera aleyrodidarum and the facultative secondary symbionts Arsenophonus, Cardinium, Fritschea,Hamiltonella, Rickettsia, and Wolbachia. The roles of these symbionts are yet unknown. In this study, we tested for possible effects of one symbiont, Rickettsia, on some Þtness parameters of B. tabaci (biotype B) by comparing whiteßies that carry this symbiont to whiteßies that do not. Preadult development of Rickettsiacarryingwhiteßieswas faster, but all theotherparameters thatweremeasured: longevity, total number of progeny, sex ratio, and nymphal survivorship did not differ signiÞcantly. Estimates of the intrinsic growth rate (r) were almost identical for the two groups. Cross-mating between Rickettsia-carrying and Rickettsia-free whiteßies provided no evidence for cytoplasmic incompatibility. Vertical transmission of Rickettsia was found to be nearly complete. Our results do not clearly identify a selective advantage that would explain the high prevalence of Rickettsia in B. tabaci populations, thus, other Þtness parameters and horizontal transmission routes are suggested and discussed.
منابع مشابه
Rapid spread of a bacterial symbiont in an invasive whitefly is driven by fitness benefits and female bias.
Maternally inherited bacterial symbionts of arthropods are common, yet symbiont invasions of host populations have rarely been observed. Here, we show that Rickettsia sp. nr. bellii swept into a population of an invasive agricultural pest, the sweet potato whitefly, Bemisia tabaci, in just 6 years. Compared with uninfected whiteflies, Rickettsia-infected whiteflies produced more offspring, had ...
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