Literature Review: Muskrat Ups and Downs

by Carl Strang

One of the classical sources of data in vertebrate wildlife ecology is the Hudson Bay Company fur records in Canada. Those were used, for instance, to establish the dramatic cyclical pattern of lynx relative to showshoe hare populations, inspiring much subsequent research as to the underlying causes. There still are data to be mined from those records, as was demonstrated in a 2011 study [Estay SA, Albornoz AA, Lima M, Boyce MS, Stenseth NC. A Simultaneous Test of Synchrony Causal Factors in Muskrat and Mink Fur Returns at Different Scales across Canada. PLoS ONE 6(11): e27766. doi:10.1371/journal.pone.0027766].

The muskrat, primary focus of this study, is common across North America, including northeast Illinois.

The researchers examined Hudson Bay Company fur records from 81 posts across Canada, looking at muskrat numbers, mink numbers, and bringing in climate data. They concluded that mink had an important impact on muskrats all across Canada, but the greatest and most direct effect was in the west.

Mink, also common in our area, are predators of muskrats.

In the east, variation in winter precipitation also was important, with drought in particular affecting muskrats. Interactions among these factors could be important here. For instance, drought could force muskrats to disperse longer distances over land, reduce their watery escape space, and concentrate them, exposing them to greater mink predation.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: