[NatureNS] Muskrat versus beaver diet choices

Date: Sat, 20 Sep 2008 02:34:06 -0300
From: Stephen Shaw <srshaw@dal.ca>
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We live on Chocolate Lake in Halifax, and during our time the garden has always
had a multi-stalked rose bush growing within a couple of feet of the lake edge.
This was trained up high over a tree and has (or had) six sturdy woody stems
each about 1 inch thick: it must have been growing there for 20+ years.
 A couple of days ago I noticed that most of the leaves on the rose were
shrivelled and dying, and traced this back to find that 5 of the 6 stems
appeared to have been hacked through with a machete, probably about a week
earlier.  After thinking dark misanthropic thoughts, on closer inpection there
were some striations on the hacks and the two ends of each hack didn't seem to
match.  It looked as if short sections had been removed by something with teeth
-- looks like a rodent did it.  This urban lake doesn't look like prime beaver
habitat and I've never seen or heard of one living or visiting locally on the
lake, but at least one muskrat has lived here for some years and is still
around.

Question: this muskrat regularly chews off nearby soft plant shoots (lilies?)
that grow directly out of the lake near the edge.  I thought that muskrats
exclusively subsist on such soft diet material and don't go after woody shrubs
or trees in the manner of a beaver.  Is this correct, or could the muskrat be a
possible culprit for the woody rose incident?
Steve

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