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I do take Marty's point that with huge shipments of goods=2C and also peo --Apple-Mail-24--1048870773 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit 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 --Apple-Mail-24--1048870773 Content-Type: text/html; charset=US-ASCII Content-Transfer-Encoding: quoted-printable <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&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: 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. Now, of course, it's everywhere. It = certainly 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. </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 = class=3D"Apple-style-span" style=3D"border-collapse: separate; color: = rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 14px; = 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: 0; "><div style=3D"word-wrap: = break-word; -webkit-nbsp-mode: space; -webkit-line-break: = after-white-space; "><span class=3D"Apple-style-span" = style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: = 'Times New Roman'; font-size: 14px; font-style: normal; font-variant: = normal; font-weight: normal; letter-spacing: normal; line-height: = normal; orphans: 2; 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; "><div style=3D"word-wrap: = break-word; -webkit-nbsp-mode: space; -webkit-line-break: = after-white-space; "><span class=3D"Apple-style-span" = style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: = 'Times New Roman'; font-size: 14px; font-style: normal; font-variant: = normal; font-weight: normal; letter-spacing: normal; line-height: = normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: = normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: = 0px; -web