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Hi Jen & All, Mar 25, 2012
Viewing 'invasions' as a symptom of some underlying inbalance is I =
think a positive approach because it leads naturally to the questions; =
"What is the nature of this hypothetical inbalance ?" and "What led to =
this inbalance ?".=20
In like vein, it may sometimes help to think of 'invasives' as a =
form of mine canary or organisms exploiting an underutilized resource. =
But the idea that Phragmites dominates ditches (and waterways) and =
therby excludes Cattails and other plants sounds like an excerpt from an =
invasive "fact sheet".=20
It can, given really wet (and saline ?) conditions remain dominant =
for many decades (Annapolis Royal being a good local example) but we =
have many intermittently wet ditches in which both Phragmites and Typha =
are absent. Typha, like Phragmites, does not readily get established but =
once established persists by extension of rhizomes.
The recent relatively rapid spread of Phragmites along major =
highways contrasts with absence or near absence of movement pre 1970 =
(1990?). These new ditches are wider and more shallow than the old style =
ditches, typically have more bare soil and are not mowed every year but =
it may be more than habitat differences. Perhaps some change in highway =
maintenance now actively increases movement by e.g. transporting seeds =
or transplanting rhizomes.
I planted some Phragmites in a wet area of the garden in 1991 and it =
became a vigorous stand (about 10' x 10') by ~1994. But even when =
vigorous and dense it was a nursery for Ash and Maple and had a dense =
understory of herbaceous plants. The perimeter of this patch has been =
mowed or dug each year to contain it and the colony is now quite weak. =
If I had failed to pull Ash and Maple seedling it would long since have =
become a thicket.=20
A second patch that I allowed to spread down a wet bank is still =
vigorous (being more recent) but is also rapidly becoming a thicket of =
woody plants that I must get at. These culms are good filters for =
wind-blown seeds.
Yours truly, Dave Webster, Kentville
----- Original Message -----=20
From: jen cooper=20
To: naturens@chebucto.ns.ca=20
Sent: Wednesday, March 21, 2012 7:25 PM
Subject: RE: [NatureNS] Invasives
Hi all,=20
Queen Anne's lace and colt's foot are non-native. They originated =
overseas and were brought here by humans. Green crab and Phragmites are =
invasive. They do better than native plants and choke out diversity. =
Phragmites, for example dominates ditches and waterways and does not =
allow for native cattails to form stands. Cattails allow for diversity, =
rushes, etc. Pragmites forms monospecific stands. Thus, non-native - not =
from around here. Invasive - upsets the diversity and/or function of the =
system.=20
Interestingly, invasive plants thrive in to places that have been =
disturbed by humans. In my opinion they are not cause but a symptom. =
Phragmites, is a hyperaccumulator, pulling compounds like metals and =
excess nutrients up from the ground and storing them in its flesh. That =
is why it does so well along roadsides. It has a high tolerance for =
vehicle run-off. If harvested and disposed - and controlled so it doesnt =
spread - of properly it is a great phytoremediator. Zebra mussels =
basically filtered and cleaned Lake Erie. It is dominated by the mussels =
but is no longer the most polluted of the lakes.=20
Invasive organisms do better in these ecosystems than the natives =
because we have altered the ecosystem. That is what I mean by calling =
them a symptom.=20
:)
Jen
-------------------------------------------------------------------------=
-----
From: randy.lauff@gmail.com
Date: Wed, 21 Mar 2012 16:38:54 -0300
Subject: Re: [NatureNS] Invasives
To: naturens@chebucto.ns.ca
I think the definition that Lance forwarded has a common mistake in it =
(not Lance's, but the original):
"defines invasive species as "... coming from other countries or =
regions and moving outside their native habitat".=20
Too often I see the words "range" and "habitat" used interchangeably. =
However, if I'm correct, then the second part of the definition put =
forward is redundant.=20
I will always look on House Sparrows and Dandelions and more as =
non-native species. The "individuals" which are here, are native, but =
that's not the issue; the species do not belong here. "Invasive" in my =
mind, refers to the intensity of the foreign species' occupation. =
Hungarian Partridge are not invasive here, though they still are alien; =
Japanese Bamboo is both.
Randy
_________________________________
RF Lauff
Way in the boonies of
Antigonish County, NS.
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<BODY class=3Dhmmessage bgColor=3D#ffffff>
<DIV><FONT face=3DArial>Hi Jen & All, =
=20
Mar 25, 2012</FONT></DIV>
<DIV><FONT face=3DArial> Viewing 'invasions' as a =
symptom of=20
some underlying inbalance is I think a positive approach because it =
leads=20
naturally to the questions; "What is the nature of this hypothetical =
inbalance=20
?" and "What led to this inbalance ?". </FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial> In like vein, it may =
sometimes help to=20
think of 'invasives' as a form of mine canary or organisms exploiting an =
underutilized resource. </FONT> </DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial> But the idea that Phragmites =
dominates=20
ditches (and waterways) and therby excludes Cattails and other plants =
sounds=20
like an excerpt from an invasive "fact sheet". </FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial> It can, given really wet (and =
saline ?)=20
conditions remain dominant for many decades (Annapolis Royal being a =
good local=20
example) but we have many intermittently wet ditches in which both =
Phragmites=20
and Typha are absent. Typha, like Phragmites, does not readily get =
established=20
but once established persists by extension of rhizomes.</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial> The recent relatively rapid =
spread of=20
Phragmites along major highways contrasts with absence or near =
absence of=20
movement pre 1970 (1990?). These new ditches are wider and more =
shallow=20
than the old style ditches, typically have more bare soil and are not =
mowed=20
every year but it may be more than habitat differences. Perhaps some =
change in=20
highway maintenance now actively increases movement by e.g. transporting =
seeds=20
or transplanting rhizomes.</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial> I planted some Phragmites in =
a wet area=20
of the garden in 1991 and it became a vigorous stand (about 10' x =
10') by=20
~1994. But even when vigorous and dense it was a nursery for Ash and =
Maple and=20
had a dense understory of herbaceous plants. The perimeter of this patch =
has=20
been mowed or dug each year to contain it and the colony is now =
quite weak.=20
If I had failed to pull Ash and Maple seedling it would long since have =
become a=20
thicket. </FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial> A second patch that I allowed =
to spread=20
down a wet bank is still vigorous (being more recent) but is also =
rapidly=20
becoming a thicket of woody plants that I must get at. These culms are =
good=20
filters for wind-blown seeds.</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial>Yours truly, Dave Webster, =
Kentville</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Differcooper@hotmail.com =
href=3D"mailto:iffercooper@hotmail.com">jen=20
cooper</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dnaturens@chebucto.ns.ca=20
href=3D"mailto:naturens@chebucto.ns.ca">naturens@chebucto.ns.ca</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, March 21, 2012 =
7:25=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: [NatureNS] =
Invasives</DIV>
<DIV><BR></DIV>
<DIV dir=3Dltr>
<DIV>Hi all, </DIV>
<DIV><BR></DIV>Queen Anne's lace and colt's foot are non-native. They=20
originated overseas and were brought here by humans. Green crab and =
Phragmites=20
are invasive. They do better than native plants and choke out =
diversity.=20
Phragmites, for example dominates ditches and waterways and does not =
allow for=20
native cattails to form stands. Cattails allow for diversity, rushes, =
etc.=20
Pragmites forms monospecific stands. Thus, non-native - not from =
around here.=20
Invasive - upsets the diversity and/or function of the system.
<DIV><BR></DIV>
<DIV>Interestingly, invasive plants thrive in to places that have=20
been disturbed by humans. In my opinion they are not cause =
but a=20
symptom. Phragmites, is a hyperaccumulator, pulling compounds like =
metals and=20
excess nutrients up from the ground and storing them in its flesh. =
That is why=20
it does so well along roadsides. It has a high tolerance for vehicle =
run-off.=20
If harvested and disposed - and controlled so it doesnt spread - of =
properly=20
it is a great phytoremediator. Zebra mussels basically filtered and =
cleaned=20
Lake Erie. It is dominated by the mussels but is no longer the most =
polluted=20
of the lakes. </DIV>
<DIV><BR></DIV>
<DIV>Invasive organisms do better in these ecosystems than the natives =
because=20
we have altered the ecosystem. That is what I mean by calling them a=20
symptom. </DIV>
<DIV><BR></DIV>
<DIV>:)</DIV>
<DIV>Jen<BR><BR>
<DIV>
<DIV id=3DSkyDrivePlaceholder></DIV>
<HR id=3DstopSpelling>
From: randy.lauff@gmail.com<BR>Date: Wed, 21 Mar 2012 16:38:54=20
-0300<BR>Subject: Re: [NatureNS] Invasives<BR>To:=20
naturens@chebucto.ns.ca<BR><BR>I think the definition that Lance =
forwarded has=20
a common mistake in it (not Lance's, but the original):
<DIV><BR></DIV>
<DIV>"defines invasive species as "... coming from other countries or =
regions=20
and moving outside their native habitat". </DIV>
<DIV><BR></DIV>
<DIV>Too often I see the words "range" and "habitat" used =
interchangeably.=20
However, if I'm correct, then the second part of the definition put =
forward is=20
redundant. </DIV>
<DIV><BR></DIV>
<DIV>I will always look on House Sparrows and Dandelions and more as=20
non-native species. The "individuals" which are here, are native, but =
that's=20
not the issue; the species do not belong here. "Invasive" in my mind, =
refers=20
to the intensity of the foreign species' occupation. Hungarian =
Partridge are=20
not invasive here, though they still are alien; Japanese Bamboo is =
both.</DIV>
<DIV><BR></DIV>
<DIV>Randy</DIV>
<DIV><BR clear=3Dall>_________________________________<BR>RF =
Lauff<BR>Way in the=20
boonies of<BR>Antigonish County, NS.<BR><BR>
<DIV class=3Decxgmail_quote>
<BLOCKQUOTE style=3D"BORDER-LEFT: #ccc 1px solid; PADDING-LEFT: 1ex"=20
=
class=3Decxgmail_quote><BR></BLOCKQUOTE></DIV><BR></DIV></DIV></DIV></DIV=
>
<HR SIZE=3D1 noShade>
<A></A>
<P class=3Davgcert align=3Dleft color=3D"#000000">No virus found in =
this=20
message.<BR>Checked by AVG - <A=20
href=3D"http://www.avg.com">www.avg.com</A><BR>Version: 10.0.1424 / =
Virus=20
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