Vole populations generally peak every how many years?

• A. 2-5 years
• B. 5-10 years
• C. Every year
• D. Every 10-20 years

Answer: (A)

Voles in Michigan typically show regular boom-and-bust cycles driven by the interaction of resources and predators. When conditions are good, abundant vegetation supports rapid reproduction and survival, and their numbers rise quickly. As the population grows, food becomes scarcer and predation and disease increase, causing a sharp decline. This back-and-forth happens over a relatively short timescale, usually completing a full cycle in about two to five years. Because of that pattern, population peaks tend to occur every 2–5 years, though the exact timing can shift with local factors like winter severity, drought, or changes in predator communities. The other intervals don’t fit what wild vole populations typically do: annual peaks would imply a perpetual cycle without the classic boom-bust dynamic, while much longer intervals miss the relatively rapid cycles observed in most Michigan habitats.