Fir Waves

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Fir Waves
Created On: Aug 30, 2006
Last Edited On: Jan 5, 2011

Fir Waves

Sometime around June of 2005, BobSmith noticed, in one of my photographs, a peculiar wavelike pattern of alternating bands of living and dead evergreens (spruce or fir, I wasn't sure which at the time). I also spotted it in some (but by no means all) of my other photos of New England evergreen forests.

I Googled around and discovered that the phenomenon is called "fir waves", and seems to exist only in New England, upstate New York, and Japan. You can also find proof in this album that they exist in Quebec [at least near the U.S. border]. In addition, Matthew Becker of BYU informed me by email (citing a 1999 paper in Acta Oecologica by Puigdefábregas et al.) that a similar phenomenon is present in evergreen beeches (Nothofagus) on Tierra del Fuego. Becker's own paper reviewing fir waves together with "ribbon forests" and "hedges" is now available online: Linear Forest Patterns in Subalpine Environments.

Matt Worster noticed that fir waves sometimes show up in satellite photos.

This album is dedicated to fir waves. Post your best fir wave photos here.

Note that a blowdown or stand of dead trees is not necessarily a fir wave. A wave, by definition, is a disturbance that propagates. That motion is not visible in a photo, but if you see alternating bands you're probably looking at a wave.

External Links

This background info from an online ecology course nicely summarizes the classic 1976 paper by Sprugel about the causes of fir waves. See Linear Forest Patterns in Subalpine Environments for a review of more recent developments in the field.



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chilkoot

chilkoot - Aug 30, 2006 3:02 am - Voted 10/10

Great idea!

I like this album. It will be interesting to see all the places people have observed these. I've only noticed them in Maine and in the Whites.

nartreb

nartreb - Aug 30, 2006 3:11 pm - Hasn't voted

Re: Great idea!

I know they exist in the Adirondacks too because ecologists study them there (specifically on Whiteface, if I remember correctly). On my one trip to the 'Dacks I didn't notice any, though.

Viewing: 1-2 of 2