Lemmings keygen

Since lemming populations spike every few years — usually every three to five years, although, according to Ims, most lemming species don't peak in clockwork patterns like some other population cycling species.

However, when they do, all the predators on the tundra that depend on lemmings for food — arctic foxes, hawks and jaegers, for instance — eat very well that year. This smorgasbord ends up having an impact on the entire tundra ecosystem.

On the other hand, population spikes in lemmings can be pretty destructive. During the summer months, lemmings eat nothing but living vegetation, and when lemming populations are at their peak, the rodents eat so much vegetation they have to travel across the tundra in great numbers in search of greener pastures. In fact, during these years, they eat so much plant matter that the results are noticeable from space.

This seems detrimental to the ecosystem to have the vegetation of the tundra completely destroyed at regular intervals, but research has found that when you exclude lemmings from the system, the vegetation actually suffers over time. The irregularity in the dynamics is likely to be due to disruption from climate variability and change. Because lemmings depend on cold winters in tundra habitats, climate change is creating major problems for these important arctic residents.

In addition, the hardness of the basal layer of snow — which is determined by rain-on-snow events and wind storms in autumn — and ice presents a difficulty when it comes to the ability of the lemmings to dig burrows for shelter over the winter. Lemmings are known for their surprisingly immodest coats — most rodents do their best to blend into their surroundings, but the Norway lemming Lemmus lemmus , for instance, has a coat much like that of a calico cat.

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