Featured Research

from universities, journals, and other organizations

Invasive Plants Prefer Disturbance In Exotic Regions Over Home Regions

Date:
July 26, 2006
Source:
University of Chicago Press Journals
Summary:
One of the most invasive exotics in the western United States, the yellow starthistle, is successful both at "invasion" in non-native areas and "colonization" in native ones. However, new research from an international team of researchers finds that a disturbance -- such as fire or grazing -- actually increased the success of yellow starthistle far more in non-native than in its home regions. Furthermore, yellow starthistle was able to establish virtual monocultures in disturbed plots only where it is exotic.

One of the most invasive exotics in the western United States, the yellow starthistle, is successful both at "invasion" in non-native areas and "colonization" in native ones. However, new research from an international team of researchers finds that a disturbance -- such as fire or grazing -- actually increased the success of yellow starthistle far more in non-native than in its home regions. Furthermore, yellow starthistle was able to establish virtual monocultures in disturbed plots only where it is exotic.

"Our results are novel," says Jose Hierro (University of Montana and Universidad Nacional de La Pampa). "No one else has ever shown that ruderals, that is, plants that are generally adapted to disturbance, respond differently to disturbance in native versus non-native regions."

The researchers conducted their research over three years in southern Turkey, where the weed is native, and in California and central Argentina, two regions where the weed is non-native and remarkably abundant. Their findings, published in the August issue of The American Naturalist, question the assumption that disturbance alone is sufficient to explain the remarkable success of invasive plant species in non-native ranges. Instead, the researchers argue, the common and powerful effects of disturbance must act in concert with other factors to allow certain species to dominate plant communities only where they occur as exotics.

The researchers suggest that soil pathogens suppress the growth of certain species and may contribute to the disproportionately powerful effect of disturbance in introduced regions.

"The potential for disturbance to have much stronger effects in invaded systems than in native systems is not trivial," says Ragan Callaway (University of Montana). "If disturbance in non-native regions is no different than in native regions, then clearly the management response is to limit disturbance and thus to limit invasions. However, if disturbance in invaded regions has a much stronger effect that in native regions, then the management response must look beyond disturbance to control or limit the invasion."

Founded in 1867, The American Naturalist is one of the world's most renowned, peer-reviewed publications in ecology, evolution, and population and integrative biology research. AN emphasizes sophisticated methodologies and innovative theoretical syntheses--all in an effort to advance the knowledge of organic evolution and other broad biological principles.

Jose L. Hierro, Diego Villareal, Φzkan Eren, Jon M. Graham, and Ragan M. Callaway, "Disturbance facilitates invasion: the effects are stronger abroad than at home." The American Naturalist 167:144-156.


Story Source:

The above story is based on materials provided by University of Chicago Press Journals. Note: Materials may be edited for content and length.


Cite This Page:

University of Chicago Press Journals. "Invasive Plants Prefer Disturbance In Exotic Regions Over Home Regions." ScienceDaily. ScienceDaily, 26 July 2006. <www.sciencedaily.com/releases/2006/07/060726184752.htm>.
University of Chicago Press Journals. (2006, July 26). Invasive Plants Prefer Disturbance In Exotic Regions Over Home Regions. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2006/07/060726184752.htm
University of Chicago Press Journals. "Invasive Plants Prefer Disturbance In Exotic Regions Over Home Regions." ScienceDaily. www.sciencedaily.com/releases/2006/07/060726184752.htm (accessed September 17, 2014).

Share This



More Earth & Climate News

Wednesday, September 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Scientists Examine Colossal Squid

Raw: Scientists Examine Colossal Squid

AP (Sep. 16, 2014) — Squid experts in New Zealand thawed and examined an unusual catch on Tuesday: a colossal squid. It was captured in Antarctica's remote Ross Sea in December last year and has been frozen for eight months. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Man Floats for 31 Hours in Gulf Waters

Man Floats for 31 Hours in Gulf Waters

AP (Sep. 16, 2014) — A Texas man is lucky to be alive after he and three others floated for more than a day in the Gulf of Mexico when their boat sank during a fishing trip. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Researchers Explore Shipwrecks Off Calif. Coast

Researchers Explore Shipwrecks Off Calif. Coast

AP (Sep. 16, 2014) — Federal researchers are exploring more than a dozen underwater sites where they believe ships sank in the treacherous waters west of San Francisco in the decades following the Gold Rush. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Isolated N. Korea Asks For International Help With Volcano

Isolated N. Korea Asks For International Help With Volcano

Newsy (Sep. 16, 2014) — Mount Paektu volcano in North Korea is showing signs of life and there's not much known about it. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins