Hi Peter,
What our guide, Tom Murphy, a photographer who has assisted wildlife
productions such as those done by David Attenborough, and who lives not far
from the park so is there often, was that elk had eaten down the willows that
grow along streams etc which meant for example that there was no food for
beavers, nor branches to form their lodges. The willows would probably be a
more likely tree to stabilise stream banks than aspen, so maybe the aspen issue
is only part of the story.
Sonja
On 06/04/2014, at 10:20 AM, Peter Shute <> wrote:
> From that article:
> "When Kauffman and his colleagues studied aspen in areas where risk of attack
> by wolves was high or low, they obtained results different from Ripple’s.
> Rather than look at the five tallest aspen in each stand, as Ripple had done,
> they tallied the average tree height and used locations of elk kills to map
> the risk of wolf attacks. By these measures, they found no differences
> between trees in high- and low-risk areas."
>
> So some people are getting excited about tree regrowth that might be
> attributed to the presence of wolves, but others are arguing about whether
> there's been any regrowth at all.
>
> Anyone else confused?
>
> Peter Shut
>
> Sent from my iPhone
>
> On 4 Apr 2014, at 3:51 pm, "Ross Macfarlane"
> <<>> wrote:
>
> It's a fascinating narrative, but like most things maybe not as simple as it
> sounds -
> http://www.nature.com/news/rethinking-predators-legend-of-the-wolf-1.14841
>
> -----Original Message-----
> From: Clive Nealon
> Sent: Friday, April 04, 2014 11:19 AM
> To: Birding-Aus
> Subject: [Birding-Aus] A vote for conservation...
>
> A really interesting short clip on the benefits of wolves in Yellowstone N
> P.
> Perhaps a lesson that would translate to other areas...
> http://devour.com/video/how-wolves-change-rivers/
>
> Clive.
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