When predators matter! Study of voles on Arctic island advances knowledge of small-mammal population dynamics

A decades-long study of introduced voles on the Norwegian islands of Svalbard is helping to answer a longstanding puzzle of Arctic ecology -- what drives the well-established population cycles of small Arctic mammals, such as voles and lemmings. These plant-eating rodents are among the most populous Arctic mammals. The results suggest the importance of predators as a primary factor driving the cycles, and shows that bottom-up, herbivore-plant interactions fail to generate their usual population cycles.

source https://www.sciencedaily.com/releases/2021/09/210910172729.htm