[NatureNS]Invasive aliens: was re unauthorized vs. OK plants lists

From: Christopher Majka <c.majka@ns.sympatico.ca>
To: naturens@chebucto.ns.ca
Date: Mon, 1 Nov 2010 17:30:57 -0300
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I do take Marty's point that with huge shipments of goods=2C and also peo

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Hi Jane,

On 1-Nov-10, at 5:05 PM, David&Jane Schlosberg wrote:

> Here's a question for you experts:  is poison ivy considered to be  
> an invader?
> When we first moved to Nova Scotia (Pictou county), in 1971, I don't  
> remember seeing it at all.  Now, of course, it's everywhere.  It  
> certainly  would fall into the "noxious" category.

The term "invader" isn't a very useful or precise one. These days  
biologists often employ the term "adventive" meaning a species that  
"came from somewhere else." This is intended to encompass both species  
that were deliberately and accidentally (inadvertently) introduced.  
Adventive species can be invasive or not (most, of course, are not)  
according to factors such as their own biological potential, their  
habitat requirements, their climatic tolerance, whether they have  
predators and parasites (animals) that prey or parasitize them, or in  
the case of plants, feed on their foliage, roots, seeds, flowers, etc.

The counterpoint to adventive species are native species. Poison ivy  
(Toxicodendron radicans) and western poison ivy (Toxicodendron  
rydbergii) are both native species. Has their range expanded in Nova  
Scotia? I'm not sure; I don't think so. The 1996 Canadian Weed Control  
Act does categorize them as "noxious weeds."

Cheers!

Chris



Christopher Majka  <c.majka@ns.sympatico.ca> | Halifax, Nova Scotia,  
Canada

* Research Associate: Nova Scotia Museum | http://museum.gov.ns.ca/mnh/research-asfr.htm
* Review Editor: The Coleopterists Bulletin | http://www.coleopsoc.org/
* Subject Editor: ZooKeys | http://pensoftonline.net/zookeys/index.php/journal/index
* Associate Editor: Journal of the Acadian Entomological Society | http://www.acadianes.org/journal.html
* Editor: Atlantic Canada Coleoptera | http://www.chebucto.ns.ca/Environment/NHR/atlantic_coleoptera.html

"Whenever I hear of the capture of rare beetles, I feel like an old  
war-horse at the sound of a trumpet." - Charles Darwin


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<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; ">Hi Jane,<div><br><div><div>On =
1-Nov-10, at 5:05 PM, David&amp;Jane Schlosberg wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><span =
class=3D"Apple-style-span" style=3D"border-collapse: separate; color: =
rgb(0, 0, 0); font-family: 'Times New Roman'; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; =
text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; =
-webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: =
0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div =
class=3D"hmmessage" style=3D"font-family: Tahoma; font-size: 10pt; =
"><div><span class=3D"734380220-01112010"><font color=3D"#0000ff" =
face=3D"Arial">Here's a question for you experts:&nbsp; is poison ivy =
considered to be an invader?</font></span></div><div><span =
class=3D"734380220-01112010"><font color=3D"#0000ff" face=3D"Arial">When =
we first moved to Nova Scotia (Pictou county), in 1971, I don't remember =
seeing it at all.&nbsp; Now, of course, it's everywhere.&nbsp; It =
certainly&nbsp; would fall into the "noxious" =
category.</font></span></div></div></span></blockquote><br></div><div>The =
term "invader" isn't a very useful or precise one. These days biologists =
often employ the term "adventive" meaning a species that "came from =
somewhere else." This is intended to encompass both species that were =
deliberately and accidentally (inadvertently) introduced. Adventive =
species can be invasive or not (most, of course, are not) according to =
factors such as their own biological potential, their habitat =
requirements, their climatic tolerance, whether they have predators and =
parasites (animals) that prey or parasitize them, or in the case of =
plants, feed on their foliage, roots, seeds, flowers, =
etc.&nbsp;</div><div><br></div><div>The counterpoint to adventive =
species are native species. Poison ivy (T<i>oxicodendron radicans</i>) =
and western poison ivy (<i>Toxicodendron rydbergii</i>) are both native =
species. Has their range expanded in Nova Scotia? I'm not sure; I don't =
think so. The 1996 Canadian Weed Control Act does categorize them as =
"noxious =
weeds."</div><div><br></div><div>Cheers!</div><div><br></div><div>Chris</d=
iv><br></div><br><br><div apple-content-edited=3D"true"> <span =
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