[permaculture] Re: Pond Plantings...invasives
Treesa Jane Rogerson
treemail at cruzio.com
Sat Oct 12 03:38:57 EDT 2002
Yes please err on the side of caution:
-Proven Exotics (A good Pc Plant Nursery name)
-Unproven exoctics last, and with utmost caution
And then, remember all the scenes i nthe plant world you may have seen,
where phragmites is choking a wetland, as well as purple loosestrife. In
the long time frame there may be some homeostasis reached, but that's not to
say that that pseudo-stability isn't exhausting.
Also remember that we might not always be around to keep that eye out. If
the problem ever becomes someone else's (as in the case of the designers
hired to restore that wetland), the perceived only choice might be a resort
to something like Round Up.
"Just once, well applied, not repeatedly." Cringe.
'Treesa' Rogerson, M.A.
Lands Alive : Ecology By Design
treemail at yahoo.com
----- Original Message -----
From: "John Schinnerer" <eco_living at yahoo.com>
To: <permaculture at lists.ibiblio.org>
Sent: Thursday, October 10, 2002 10:15 PM
Subject: Re: [permaculture] Re: Pond Plantings...invasives
> > Theory sort of
> > requires that they stop multiplying when they've reached equilibrium
> > with their food source.
> No, actually, many (most?) species will go well past equilibrium on
> their initial feeding/reproducing binge, then 'crash' (humans not
> excepted). If they've displaced previous species while doing so and
> are quicker to recover, they'll continue to dominate if food supply can
> Over a large time scale this cycle of crash and recovery will look like
> something we might call "equilibrium," and the cycles may become less
> extreme/very mellow over time. On shorter time scales it will look
> like population explosion/food source decimation/food source recovery;
> repeat; repeat;....
> Species will not only go past long-term equilibrium in the short term;
> they may also push their food sources into crashing mode as well. That
> is, by the time the species population starts to crash from lack of
> food, the food they eat (or resources it requires to survive) has been
> so depleted that it may not recover, or at least not recover "quickly
> enough" for the species to also survive - especially if there are other
> faster-moving species waiting for space and time to spread.
> I doubt that what they do in one ecosystem can be any certain or
> necessarily even useful indication of what they'll do in another
> ecosystem (not according to permaculture ways of thinking, anyhow -
> complex systems, many many many variables, etc.) - and, I'd err on the
> side of caution, looking at the worst consequences in one place as at
> least possible in another.
> John Schinnerer, MA
> - Eco-Living -
> Cultural & Ecological Designing
> People - Place - Learning - Integration
> john at eco-living.net
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