Invasion of the Periodical Cicadas

Why do scientists believe that cicadas only reproduce every 13 or 17 years?

Is it due to a specific characteristic of cicadas or is there a scientific reason behind this unique reproduction cycle?

Answer:

Scientists believe that cicadas only reproduce every 13 or 17 years due to a specific characteristic of these fascinating insects.

The reason why scientists believe that cicadas have such a unique reproduction cycle lies in their long nymphal stage. Cicadas spend a considerable amount of time underground as nymphs before emerging as adults. During this nymphal stage, they can stay underground for up to 13 to 17 years.

Once they emerge as adults, cicadas only have one goal in mind - mating. After mating, the female cicadas lay their eggs, beginning a new generation that will repeat this cycle in another 13 or 17 years.

This long nymphal stage allows cicadas to avoid predators and synchronize their emergence to overwhelm their predators, ensuring the survival of their species through mass reproduction events known as "brood emergences."

Therefore, the unique reproductive cycle of cicadas is a remarkable adaptation that has evolved over millions of years, allowing them to thrive in the face of natural challenges.