What is Wolbachia and how can it affect insect populations and disease transmission?

Optimize your Entomology 1 PMT exam preparation with our targeted study material. Engage with our flashcards and multiple choice questions, complete with hints and detailed explanations. Get exam-ready today!

Multiple Choice

What is Wolbachia and how can it affect insect populations and disease transmission?

Wolbachia is a bacterial endosymbiont that lives inside the cells of many insects and other arthropods, and it is passed from mother to offspring through the eggs. The bacteria can manipulate host reproduction, most commonly through cytoplasmic incompatibility, where infected males mating with uninfected females (or with females carrying incompatible strains) produce little or no viable offspring. This gives an advantage to infected females, helping Wolbachia spread through the population and shift population dynamics toward more infected individuals. Some Wolbachia strains can even influence sex ratios by feminizing or killing certain offspring, further affecting population structure. Beyond reproduction, Wolbachia can alter a population’s capacity to transmit diseases. In mosquitoes, for example, Wolbachia can block or reduce the replication of certain pathogens inside the insect, decreasing the likelihood that a mosquito will transmit diseases such as dengue, Zika, or chikungunya. This pathogen interference, along with the bacterial cytoplasmic inheritance, underpins strategies that use Wolbachia-infected insects to suppress disease transmission in the field. So, the correct description is that Wolbachia is a bacterial endosymbiont that can manipulate reproduction and influence both population dynamics and pathogen transmission. It’s not a fungal, viral, or nematode symbiont.

Wolbachia is a bacterial endosymbiont that lives inside the cells of many insects and other arthropods, and it is passed from mother to offspring through the eggs. The bacteria can manipulate host reproduction, most commonly through cytoplasmic incompatibility, where infected males mating with uninfected females (or with females carrying incompatible strains) produce little or no viable offspring. This gives an advantage to infected females, helping Wolbachia spread through the population and shift population dynamics toward more infected individuals. Some Wolbachia strains can even influence sex ratios by feminizing or killing certain offspring, further affecting population structure.

Beyond reproduction, Wolbachia can alter a population’s capacity to transmit diseases. In mosquitoes, for example, Wolbachia can block or reduce the replication of certain pathogens inside the insect, decreasing the likelihood that a mosquito will transmit diseases such as dengue, Zika, or chikungunya. This pathogen interference, along with the bacterial cytoplasmic inheritance, underpins strategies that use Wolbachia-infected insects to suppress disease transmission in the field.

So, the correct description is that Wolbachia is a bacterial endosymbiont that can manipulate reproduction and influence both population dynamics and pathogen transmission. It’s not a fungal, viral, or nematode symbiont.

More practice questions