Which of the following lists all Aedes species that are univoltine?

• A. Ae. squamiger, Ae. tahoensis, Ae. washinoi
• B. Ae. squamiger, Ae. vexans
• C. Ae. aegypti, Ae. albopictus
• D. Ae. taeniorynchus, Ae. vexans

Answer: (A)

Univoltine means one generation per year. In mosquitoes, how many generations you get in a year depends on climate and the species’ life history. Aedes species in temperate regions often complete just a single brood because the warm season is short and winters are harsh, so development is limited to one annual cycle (sometimes with eggs that survive winter and hatch when conditions improve). Among the species listed, those linked to temperate, shorter breeding seasons are described as univoltine, so they complete only one generation each year. The other species are typically able to produce multiple generations when temperatures and resources permit, so they’re not univoltine in those conditions. Therefore, the set that represents all univoltine Aedes species is the group that includes squamiger, tahoensis, and washinoi.