Cattle Egrets were supposed to be a natural dispersal via anemochore as I recall, a one time event wasn't it?
Invasive species need not be exotic species, at least from a continental perspective. For example, sugar maple is native to most forests in Illinois, but with changes in fire regimes it becomes invasive crowding out the oak-hickory. Sweetgum does a similar thing in southern wet forests, and there are a pile of other examples. these are NATIVE INVASIVES. Bullfrogs fall in between from a continental pespective. they are native to and widespread in North America, but they have been introduced into habitats in the west where they do not normally occur creating havoc. Technically, these are also exotic invasives at the regional or local level, but native invasives from a continental perspective. Lonicera japanicus is an exotic invasive in streams of North America, although some closely related Lonicera are NONINVASIVE EXOTICS, and some simply cannot even become established!! Likewise, asiatic mussels, zebra mussels, and an assortment of other species are EXOTIC INVASIVES. I don't know why we do it, but often we lump issues about exotics and those about invasives together under the same title. It really is not appropriate because the two overlap, but are not the same things. On Tue, Oct 29, 2013 at 10:12 AM, Meg Ballard <[email protected]> wrote: > The difference is the scale of invasion, both temporal and spatial. > > There is a difference in moving from one pond to an adjacent one, where > your natural enemies and competitors are likely to exist, vs > intercontinental or oceanic movements that occur in short time scales > rather than evolutionary time scales. > > > On Tue, Oct 29, 2013 at 10:45 AM, malcolm McCallum < > [email protected]> wrote: > >> I mentioned this correspondence to a friend who works a lot in this >> field. This is what he/she said (i'm leaving off the name since >> he/she is not available to ask permission to expose it right now!): >> >> "What I absolutely can't stand is the term "invasion biology". It's >> colonization theory pure and simple. Anything can invade. Painted >> Turtles or Green Frogs to a new farm pond. Besides being misused, I >> think that the term prejudices the research approach. As for the >> debate, the best arguments against studying exotic species and their >> impacts are embarrassing." >> >> What has caused us to move from using "colonization theory" and to the >> new term "invasion biology?" Are they really different? I don't see >> a difference either. >> >> On Mon, Oct 28, 2013 at 9:58 AM, lisa jones <[email protected]> wrote: >> > >> > >> > >> > >> > >> > >> > A quick and interesting editorial piece from Richardson & Ricciardi >> "Misleading criticisms of invasion science: a field guide" in Diversity and >> Distributions (2013, 19: 1461-1467). >> > >> > A link to the article can be found here on the Canadian Aquatic Invasive >> Species Network (CAISN) website (listed near the bottom of the page): >> > http://www.caisn.ca/en/publications >> > >> > I am sure there will be a response from those who see no value in >> invasion science but as one reviewer pointed out "when invasions are driven >> by us (ballast waters, trade, aquaculture, you >> > name it) and overcome wide ecological barriers... well, I would be very >> > careful in saying that there is no problem." >> > >> > Lisa >> > >> > >> > >> > >> > >> >> >> >> -- >> Malcolm L. McCallum >> Department of Environmental Studies >> University of Illinois at Springfield >> >> Managing Editor, >> Herpetological Conservation and Biology >> >> >> >> "Peer pressure is designed to contain anyone with a sense of drive" - >> Allan Nation >> >> 1880's: "There's lots of good fish in the sea" W.S. Gilbert >> 1990's: Many fish stocks depleted due to overfishing, habitat loss, >> and pollution. >> 2000: Marine reserves, ecosystem restoration, and pollution reduction >> MAY help restore populations. >> 2022: Soylent Green is People! >> >> The Seven Blunders of the World (Mohandas Gandhi) >> Wealth w/o work >> Pleasure w/o conscience >> Knowledge w/o character >> Commerce w/o morality >> Science w/o humanity >> Worship w/o sacrifice >> Politics w/o principle >> >> Confidentiality Notice: This e-mail message, including any >> attachments, is for the sole use of the intended recipient(s) and may >> contain confidential and privileged information. Any unauthorized >> review, use, disclosure or distribution is prohibited. If you are not >> the intended recipient, please contact the sender by reply e-mail and >> destroy all copies of the original message. >> -- Malcolm L. McCallum Department of Environmental Studies University of Illinois at Springfield Managing Editor, Herpetological Conservation and Biology "Peer pressure is designed to contain anyone with a sense of drive" - Allan Nation 1880's: "There's lots of good fish in the sea" W.S. Gilbert 1990's: Many fish stocks depleted due to overfishing, habitat loss, and pollution. 2000: Marine reserves, ecosystem restoration, and pollution reduction MAY help restore populations. 2022: Soylent Green is People! The Seven Blunders of the World (Mohandas Gandhi) Wealth w/o work Pleasure w/o conscience Knowledge w/o character Commerce w/o morality Science w/o humanity Worship w/o sacrifice Politics w/o principle Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.
