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Transinfected Wolbachia have minimal effects on male reproductive success in Aedes aegypti.

Turley AP, Zalucki MP, O'Neill SL, McGraw EA - Parasit Vectors (2013)

Bottom Line: Uninfected females that mate with Wolbachia infected males do not reproduce due to cytoplasmic incompatibility (CI).Here we ascertain and compare the effects of the two strains on male fitness in resource-limited environments that may better approximate the natural environment.The benign strain of Wolbachia, wMel causes similar reductions in fecundity as the more virulent, wMelPop, and neither are too great that they should not still spread given the action of CI.

View Article: PubMed Central - HTML - PubMed

Affiliation: The School of Biological Sciences, Monash University, Clayton, Vic 3800, Australia.

ABSTRACT

Background: Wolbachia are maternally inherited endosymbiotic bacteria that manipulate the reproductive success of their insect hosts. Uninfected females that mate with Wolbachia infected males do not reproduce due to cytoplasmic incompatibility (CI). CI results in the increased frequency of Wolbachia-infected individuals in populations. Recently, two Wolbachia strains, the benign wMel and virulent wMelPop have been artificially transinfected into the primary vector of dengue virus, the mosquito Ae. aegypti where they have formed stable infections. These Wolbachia infections are being developed for a biological control strategy against dengue virus transmission. While the effects of Wolbachia on female Ae. aegypti have been examined the effects on males are less well characterised. Here we ascertain and compare the effects of the two strains on male fitness in resource-limited environments that may better approximate the natural environment.

Methods: A series of population mating trials were conducted to examine the effect of Wolbachia infection status (with strains wMel and wMelPop) and male larval nutrition on insemination frequency, remating rates, the fecundity of females, the hatch rates of eggs and the wing length and fertility of males.

Results: wMel and wMelPop infections reduce the fecundity of infected females and wMelPop reduces the viability of eggs. Low nutrition diets for males in the larval phase affects the fecundity of wMel-infected females. Neither strain of Wolbachia affected sperm quality or viability or the ability of males to successfully mate multiple females.

Conclusions: The benign strain of Wolbachia, wMel causes similar reductions in fecundity as the more virulent, wMelPop, and neither are too great that they should not still spread given the action of CI. The ability of Wolbachia-infected males to repeat mate as frequently as wildtype mosquitoes indicates that they will be very good agents of delivering CI in field release populations.

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Related in: MedlinePlus

Egg viability expressed as median hatch rate ± quartiles. Kolmogorov-Smirnov test is significant if *P < Holm-Bonferroni α (Table3). The wMelPop strain in female Ae. aegypti (A.PGYP1.out) reduced the hatch rates of eggs.
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Figure 1: Egg viability expressed as median hatch rate ± quartiles. Kolmogorov-Smirnov test is significant if *P < Holm-Bonferroni α (Table3). The wMelPop strain in female Ae. aegypti (A.PGYP1.out) reduced the hatch rates of eggs.

Mentions: Larval nutrition of males (F = 7.551, df = 1, P < 0.001), Wolbachia infections in females (F = 26.908, df = 4, P < 0.001), and interactions between these factors (F = 3.745, df = 4, P < 0.05) affected fecundity. Wild-type females laid significantly more eggs than Wolbachia-infected females, regardless of male nutrition or infection status. When males were reared on high nutrition, wMel-infected females laid more eggs than wMelPop-infected females, irrespective of male infection status. However, when males were reared on low nutrition, no difference was observed between the fecundity of wMel and wMelPop-infected females (Figure1, Table1). wMel-infected females that mated with males reared on high-nutrition larval diets laid more eggs than those that mated with males reared on low-nutrition larval diets (Table2).


Transinfected Wolbachia have minimal effects on male reproductive success in Aedes aegypti.

Turley AP, Zalucki MP, O'Neill SL, McGraw EA - Parasit Vectors (2013)

Egg viability expressed as median hatch rate ± quartiles. Kolmogorov-Smirnov test is significant if *P < Holm-Bonferroni α (Table3). The wMelPop strain in female Ae. aegypti (A.PGYP1.out) reduced the hatch rates of eggs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3584945&req=5

Figure 1: Egg viability expressed as median hatch rate ± quartiles. Kolmogorov-Smirnov test is significant if *P < Holm-Bonferroni α (Table3). The wMelPop strain in female Ae. aegypti (A.PGYP1.out) reduced the hatch rates of eggs.
Mentions: Larval nutrition of males (F = 7.551, df = 1, P < 0.001), Wolbachia infections in females (F = 26.908, df = 4, P < 0.001), and interactions between these factors (F = 3.745, df = 4, P < 0.05) affected fecundity. Wild-type females laid significantly more eggs than Wolbachia-infected females, regardless of male nutrition or infection status. When males were reared on high nutrition, wMel-infected females laid more eggs than wMelPop-infected females, irrespective of male infection status. However, when males were reared on low nutrition, no difference was observed between the fecundity of wMel and wMelPop-infected females (Figure1, Table1). wMel-infected females that mated with males reared on high-nutrition larval diets laid more eggs than those that mated with males reared on low-nutrition larval diets (Table2).

Bottom Line: Uninfected females that mate with Wolbachia infected males do not reproduce due to cytoplasmic incompatibility (CI).Here we ascertain and compare the effects of the two strains on male fitness in resource-limited environments that may better approximate the natural environment.The benign strain of Wolbachia, wMel causes similar reductions in fecundity as the more virulent, wMelPop, and neither are too great that they should not still spread given the action of CI.

View Article: PubMed Central - HTML - PubMed

Affiliation: The School of Biological Sciences, Monash University, Clayton, Vic 3800, Australia.

ABSTRACT

Background: Wolbachia are maternally inherited endosymbiotic bacteria that manipulate the reproductive success of their insect hosts. Uninfected females that mate with Wolbachia infected males do not reproduce due to cytoplasmic incompatibility (CI). CI results in the increased frequency of Wolbachia-infected individuals in populations. Recently, two Wolbachia strains, the benign wMel and virulent wMelPop have been artificially transinfected into the primary vector of dengue virus, the mosquito Ae. aegypti where they have formed stable infections. These Wolbachia infections are being developed for a biological control strategy against dengue virus transmission. While the effects of Wolbachia on female Ae. aegypti have been examined the effects on males are less well characterised. Here we ascertain and compare the effects of the two strains on male fitness in resource-limited environments that may better approximate the natural environment.

Methods: A series of population mating trials were conducted to examine the effect of Wolbachia infection status (with strains wMel and wMelPop) and male larval nutrition on insemination frequency, remating rates, the fecundity of females, the hatch rates of eggs and the wing length and fertility of males.

Results: wMel and wMelPop infections reduce the fecundity of infected females and wMelPop reduces the viability of eggs. Low nutrition diets for males in the larval phase affects the fecundity of wMel-infected females. Neither strain of Wolbachia affected sperm quality or viability or the ability of males to successfully mate multiple females.

Conclusions: The benign strain of Wolbachia, wMel causes similar reductions in fecundity as the more virulent, wMelPop, and neither are too great that they should not still spread given the action of CI. The ability of Wolbachia-infected males to repeat mate as frequently as wildtype mosquitoes indicates that they will be very good agents of delivering CI in field release populations.

Show MeSH
Related in: MedlinePlus