Rapid Evolution of Wolbachia in Drosophila
Author Information
Author(s): Andrew R. Weeks, Michael Turelli, William R. Harcombe, K. Tracy Reynolds, Ary A. Hoffmann
Primary Institution: University of Melbourne
Hypothesis
Wolbachia will evolve from a parasitic to a mutualistic relationship with its Drosophila host over time.
Conclusion
Wolbachia in California Drosophila simulans have evolved to provide a fecundity advantage to infected females in less than 20 years.
Supporting Evidence
- Wolbachia-infected females now exhibit a 10% fecundity advantage over uninfected females.
- The infection spread rapidly through California populations of Drosophila simulans.
- Laboratory assays showed a significant increase in fecundity associated with Wolbachia infection.
- Changes in the genome of Wolbachia are responsible for the increased fecundity.
Takeaway
A tiny germ called Wolbachia that lives inside fruit flies has changed from being a bad guy to a good guy, helping the flies lay more eggs over 20 years.
Methodology
The study involved monitoring Wolbachia infection spread and conducting fecundity assays in laboratory and field settings over 20 years.
Limitations
The study did not directly measure field maternal transmission rates of the Wolbachia infection.
Participant Demographics
Drosophila simulans collected from four locations in California.
Statistical Information
P-Value
p = 0.005
Confidence Interval
95% bCI 2.6% to 18.2%
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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