Search found 156 matches

by Lee Frelich
Sat Jan 07, 2012 3:01 pm
Forum: Forest Ecology and Processes
Topic: Moss Has Cloned Itself for 50,000 Years
Replies: 7
Views: 5595

Re: Moss Has Cloned Itself for 50,000 Years

Ed: I would sample a whole bunch of different parts of the moss, since there might be different patches of the moss that had different mutations, so that the development and then flow across the landscape of each mutation could be followed. If not, it might be hard or impossible to tell how much tim...
by Lee Frelich
Sat Jan 07, 2012 11:39 am
Forum: Old Growth and Primary Forests
Topic: Arboreally Speaking, the Good Old Growth Curve Is a Delusion
Replies: 15
Views: 11068

Re: Arboreally Speaking, the Good Old Growth Curve Is a Delu

Neil et al.: Here is a trip through the universe of temporal and spatial scales in forest ecology, which gives some perspective to the above discussion. Its true that many old trees continue to grow at a high rate (especially of you calculate basal area or volume increment, which one of Craig Lorime...
by Lee Frelich
Sat Jan 07, 2012 10:21 am
Forum: Forest Ecology and Processes
Topic: Moss Has Cloned Itself for 50,000 Years
Replies: 7
Views: 5595

Re: Moss Has Cloned Itself for 50,000 Years

Ed: I suppose I would try the so-called molecular clocks that look at DNA in various organelle (chloroplasts, mitochondria, etc.). Looking at C14 at various depths in the moss carpet might be interesting, and may or may not tell us much, depending on the rate of decay and how the oldest organic carb...
by Lee Frelich
Fri Jan 06, 2012 2:22 pm
Forum: Forest Ecology and Processes
Topic: Moss Has Cloned Itself for 50,000 Years
Replies: 7
Views: 5595

Re: Moss Has Cloned Itself for 50,000 Years

I am always doubtful about peoples claims that a given organism is a clone that hasn't reproduced for thousands of years. Such claims have been made for aspen, various fungi, mosses, etc., over the years. What I find more interesting is that Sphagnum can grow in Hawaii--this lends support to the hyp...
by Lee Frelich
Sat Nov 12, 2011 2:03 pm
Forum: Asia
Topic: Manchuria, aka northeast China
Replies: 36
Views: 10439

Re: Manchuria, aka northeast China

Neil: I liked your pictures of P koraiensis. The University of Minnesota Landscape Arboretum has a collection of supposedly every tree species in the world that will grow in Minnesota's climate, and they are arranged by genus along a three-mile long walkway. One time I was measuring eastern white pi...
by Lee Frelich
Sat Nov 12, 2011 1:58 pm
Forum: Germany
Topic: The tallest linden of Europe
Replies: 4
Views: 2437

Re: The tallest linden of Europe

Kouta: 30 m versus 44 m, and the wrong species--I guess misidentified and mismeasured trees are not unique to the big tree list in the U.S. Even I would be able to tell the difference between T. cordata and T. platyphyllos, since those species are more common along streets in the city in Minneapolis...
by Lee Frelich
Sat Oct 22, 2011 9:47 am
Forum: Minnesota
Topic: Pagami Creek Fire, Minnesota
Replies: 14
Views: 7555

Re: Pagami Creek Fire, Minnesota

ENTS: As of today (Oct 22) the Pagami Creek fire is 91% contained, and because an inch of rain fell last week combined with rapidly cooling weather, they are removing crews and equipment from the area. A research program funded by the National Science Foundation rapid response fund is underway, head...
by Lee Frelich
Sat Oct 01, 2011 10:12 am
Forum: Invasive Species and Tree Diseases
Topic: Hemlocks Still Abundant Despite Adelgid Infestation
Replies: 26
Views: 10147

Re: Hemlocks Still Abundant Despite Adelgid Infestation

Bob and Joe: FIA methods and implementation have improved a lot, especially in the last five years. I don't hesitate to use FIA data because I understand its many flaws, and like any good scientist, can extract conclusions that are not affected by those flaws. This is mainly a scale issue. With the ...
by Lee Frelich
Fri Sep 30, 2011 9:54 am
Forum: Invasive Species and Tree Diseases
Topic: Hemlocks Still Abundant Despite Adelgid Infestation
Replies: 26
Views: 10147

Re: Hemlocks Still Abundant Despite Adelgid Infestation

Bob et al.: I think the FIA is quite accurate at larger spatial scales--say the size of a county in northern MN, or half of MA. Most people don't appreciate the degree to which forest trends (in many variables such as species richness, tree mortality, species composition, etc.) can be opposite at di...
by Lee Frelich
Mon Sep 26, 2011 1:56 pm
Forum: Minnesota
Topic: Pagami Creek Fire, Minnesota
Replies: 14
Views: 7555

Re: Pagami Creek Fire, Minnesota

Paul: Sorry that Minnesota has made so much smoke. See this pair of pictures. The first is from Sept 13, when the fire blew up and ran 16 miles on a strong westerly wind. Picture2.jpg Note the pyrocumulus cloud--basically a thunderhead formed by condensation of the water vapor liberated by the burni...

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