FW: [canberrabirds] Oh Canada

To: "" <>
Subject: FW: [canberrabirds] Oh Canada
From: Geoffrey Dabb <>
Date: Sat, 10 Dec 2016 01:25:50 +0000


From: David Rees [
Sent: Saturday, 10 December 2016 11:32 AM
To: Con Boekel
Cc: <>
Subject: Re: [canberrabirds] Oh Canada


So true.  and you know that we in Australia are (should be) keeping our fingers crossed for the long term effect of the exotic  Myrtle rust pathogen currently becoming more and more established on Australia's east coast.




On Sat, Dec 10, 2016 at 7:52 AM, Con Boekel <> wrote:

The Beaver is so retro!

I am thinking that Canada should choose a creature that has real environmental significance. My choice for Canada is the Mountain Pine Beetle. It has destroyed around about half the merchantable timber in the 18 million hectares of pine forests it has attacked. It is spreading its distribution eastwards, having crossed the Rocky Mountains in clouds by way of the wind vector. One thought is that it is doing well because the deep frost winters that used to suppress their numbers are now not as common as they used to be. Bark beetle explosions, and the consequent destruction, have been a northern hemisphere feature. In Canada it is estimated that the Mountain Pine Beetle (by desequestering carbon stored in the forests it has killed) has negated ALL the measures taken by Canada to date to reduce carbon emissions. There are many species of bark beetles and the Mountain Pine Beetle is only one of the species that appears to be appreciating the consequences of global warming.

In ecological term their activities are having three and possibly four significant consequences. The first is that in many instances they replace old growth forests with regrowth of the same species; the second outcome in some places is that the original forest species is replaced completely by a new species of forest; the third outcome is that they stuff up the hydrology of the forests they kill; and the fourth outcome, and this is still open to strong debate, is that they alter the fire regimes of the forests they kill.

They ought to be a salutary reminder that, just as global warming trends will not be linear, neither will various biotic responses be linear.

The Mountain Pine Beetle is, therefore, for Canada an appropriate innovative, agile and exciting forward looking symbol for the nation.



<Prev in Thread] Current Thread [Next in Thread>
  • FW: [canberrabirds] Oh Canada, Geoffrey Dabb <=

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the Canberra Ornithologists Group mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the list contact David McDonald, list manager, phone (02) 6231 8904 or email . If you can not contact David McDonald e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU