Joe: Yes, but the time scale will be on the order of several million years. That might seem long to us, but it is very short compared to the length of time life has been present on the earth.
Lee Joseph Zorzin wrote: > the fundamental question - can the Earth ever recover from the comet > like impact of humans and be as great as it once was? > > > ----- Original Message ----- > *From:* Lee Frelich <mailto:[email protected]> > *To:* [email protected] <mailto:[email protected]> > *Sent:* Sunday, October 25, 2009 11:49 AM > *Subject:* [ENTS] Re: Autopoietic Forests and Forest Patch Management > > > Gary, Ed: > > As Ed points the autopoietic concept and preservation concept have > problems in terms of defining what indirect effects of people are > allowed for a system to still be considered autopoietic. The indirect > effects that are allowed or not allowed then lead to all sorts of > logic > problems with temporal and spatial scale as it relates to > preservation. > > For example, if autopoiesis includes watching how collective DNA > of the > species within the preserved area responds to loss of species due to > introduced diseases and pests, then small areas could be autopoietic, > but if it does not include those indirect effects, then no area is > big > enough to be autopoietic (or to be preserved), since no size > ensures the > absence of invasive tree diseases and pests. > > The temporal scale problem is equally large. Given many thousands or > millions of years, all systems will respond and adapt to non native > species, climate change and loss of the species that initially were > native. The introduction of invasive species, tree pests and > diseases, > and global warming become a small blip in time, and all systems > would be > autopoietic. If defined on a time scale of a few centuries, > however, all > systems would lose autopoeisis, regardless of size, given the > onslaught > of invasive species and global warming. > > Its always the temporal and spatial scale issues that are so > difficult > with any new concept in ecology. It took me 2 years to work through > those issues for the neighborhood effect hypothesis of forest > dynamics > before I was happy enough with the concept to publish it. > > If people are interested in preserving the last natural systems as > they > are right now, then there is no spatial or temporal scale at which > autopoesis or preservation will > work without a lot of management outside of the 'preserved' areas to > keep out all invasive species and stop global warming. > > Lee > > > > --~--~---------~--~----~------------~-------~--~----~ Eastern Native Tree Society http://www.nativetreesociety.org Send email to [email protected] Visit this group at http://groups.google.com/group/entstrees?hl=en To unsubscribe send email to [email protected] -~----------~----~----~----~------~----~------~--~---
