Make sure that, whatever text you use, you spend some time discussing the
dangers of using invasive exotics in landscaping.
An invasive exotics expert from Smithsonian recently gave a talk at the U.S.
Botanic Garden, where I do volunteer work. During his talk he stressed that in
the opinion
I differ from Mowbray's suggestion. ALthough it wouldn't hurt to =
mention this, it is more appropriately presented in an environmental =
science course. Ecology should be heavy of theory and structure. A =
good introductory environmental science course should address this issue =
as it is the
My understanding from the ecological literature is that invasives are
not responsible for nearly as many native species extinctions as one
would intuitively imagine, and mostly only when trophic interactions,
mainly predation, are involved. Invasive plants, rather than causing
extinctions among
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Teresa -
Intuitively, I would agree that the most serious problems associated with
invasive plants would be ecosystem disruption, but there is a group of
scientists at Smithsonian Institution studying invasives who claim that
invasives are the second most important cause of extinction.
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Between loosestrife in the marshes, spotted knapweed in the fields,
Eurasian milfoil in the lakes and garlic mustard in the forests, the
native plants are have a rough go of it here in northern Michigan.
And that's only four of the invasives in these parts.
From what I see exotics doing to
A couple articles to consider:
Gurevitch, J. and D.K. Padilla. 2004. Are invasive species a major cause
of extinctions? TREE 19:470-474.
Davis, M. 2003. Biotic globalization: does competition from introduced
species threaten biodiversity? BioScience 53:481-489.
I couldn't believe the
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I don't understand how the metric for measuring impacts of invasive
species became extinction or even local extirpation of native
species.
If I measure 90-99% cover of exotic species in a system (totally the
norm in California's central valley grasslands), I'm not supposed to be
upset about
On Tue, 2006-04-04 at 20:22, Elizabeth Leger wrote:
I don't understand how the metric for measuring impacts of invasive
species became extinction or even local extirpation of native
species.
If I measure 90-99% cover of exotic species in a system (totally the
norm in California's central
-- Original message from Elizabeth Leger [EMAIL PROTECTED]:
--
[snip]
If I measure 90-99% cover of exotic species in a system (totally the
norm in California's central valley grasslands), I'm not supposed to be
upset about the impacts of invasive species impacts
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Two field assistants are wanted to help with a project examining the carbon
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measurements. Lab work involves
The following article addresses this issue regarding the aquatic invasive
Phragmites.
Sharif
SILLIMAN, BRIAN R. BERTNESS, MARK D.
Shoreline Development Drives Invasion of Phragmites australis and the Loss
of Plant Diversity on New England Salt Marshes.
Conservation Biology 18 (5),
This is an interesting discussion. However, comparing animals and
plants in terms of extinction risk or reality is problematic. When an
animal is extinct, there are very few questions. Gone is gone. With
plants, it isn't so easy. With seeds lying dormant in the soil, a
disturbance or a fire
As we all know, extinction or the threat of extinction is, in many cases,
due to outright habitat loss. If the remaining habitat is invaded by a
non-native plant that alters the function of the habitat, the endangered
species may be pushed that much closer to extinction or, as another reader
Hi all. I think the responses to Teresa's question have been pretty
informative. There have been a dozen responses giving logical and/or anecdotal
evidence of invasive species causing extirpations...and one citation. The
published examples are very rare (I'm not saying there is none, there is
Honorable Forum:
Note: To avoid reading all of this, please go to last paragraph.
The recent string of contributions has been one of the most
stimulating and intelligent I have encountered--I am very grateful to
all of the participants. On many other lists I have encountered (and
resigned
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