Why are mosquitoes especially abundant in taiga wetlands?

In the taiga, mosquitoes are especially abundant in wetland areas because these environments provide extensive breeding sites for the insects.1

These wetlands often feature poor drainage, which is frequently caused by the presence of permafrost—a layer of soil that remains frozen for at least two years and prevents water from soaking into the ground. This lack of drainage creates the stagnant or standing water conditions that are ideal for mosquito reproduction. While well-oxygenated flowing water in the taiga tends to support other types of biting flies, the stagnant nature of the boreal wetlands specifically facilitates the high populations of mosquitoes observed in the region.123