Navigation Links
Global ISU study: Invasive species widespread, but not more than at home range
Date:3/1/2011

AMES, Iowa Invasive plant species have long had a reputation as being bad for a new ecosystem when they are introduced.

Stan Harpole, assistant professor of ecology, evolution and organismal biology at Iowa State University, is founding organizer of a team of more than 70 researchers working at 65 sites worldwide that tested that assumption.

They wanted to know if it is true that problematic invasive species often spread widely in their new habitats because they don't encounter predators or diseases that help keep them in check in their home ranges.

"There is this assumption that when plants invade a new area that they become much more abundant in the new area than they were in the native areas," said Harpole. "It turns out that, on average, they aren't any more abundant away from home than they are at home."

Harpole says there is a "rule of 10s" that can apply to invasive species.

"Of, say, 100 plants that arrive in a new area, only about 10 percent of those will survive without being in a greenhouse or some other controlled area," said Harpole. "Of those 10 that can survive, only about 10 percent of those really cause problems.

"When you think about all the species we've brought over from other areas, relatively few have become serious pest species. The problem is we've brought over so many that quite a few have become major problems and they get a lot of attention."

Harpole points to the kudzu plant as an example.

Kudzu was introduced from Asia as a soil erosion plant more than a century ago. It now chokes out native species from Texas to Maine to Florida, according to the U.S. Department of Agriculture.

Problem plants like this are uncommon when compared to all the exotic species in a region, but they do get the most interest and may give the impression that species that escape their home range often spread and take over new habitats and become more abundant than before, says Harpole.

Invasion can also be thought of more generally as a process in which new species enter new habitats. Even plants now considered native were once invaders, says Harpole.

When glaciers receded from the Midwest 10,000 years ago, there were no native species in the area the retreating ice left bare ground open for invasion.

"All the plants that are now seen as native were invasive in the past in the sense that they had to spread across the landscape," he said.

"What's different today is that we move plants so much faster than they would move by themselves. Now a species can become global in a matter of years, where it may have taken tens of thousands of years in the past," said Harpole.


'/>"/>

Contact: Stanley Harpole
harpole@iastate.edu
515-294-7253
Iowa State University
Source:Eurekalert  

Related medicine news :

1. Embedded Mobile & M2M Device revenues to Rise to Almost $19 Billion Globally by 2014, Says Juniper Research
2. International Diabetes Federation awards $2 million to 9 global diabetes research projects
3. Virtual Global Highlights Top Ten Misconceptions about Cloud Computing
4. Global Health Defined as Public Health in a New Lancet Commentary by the Association of Schools of Public Health (ASPH)
5. Dr Yaghouti of Global Laser Vision Receives Patient's Choice Award for 2009
6. Bioniche Achieves Two Additional Milestones Under Licensing Agreement; Endo Takes up Global Rights
7. Now Serving 9 Billion: A Global Town Hall
8. The Global Leaders' Inaugural Meeting a Resounding Success
9. Language Service Leader Expands to Meet Booming, Global Industry Demand.
10. GenomeQuest Hosts Seminar Focused On Web-based Searching for Patent Information Across Global Sequence Databases
11. Global Nutrition Firm Takes Dose of SonicWALL to Boost Network Health
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Global ISU study: Invasive species widespread, but not more than at home range
(Date:10/12/2017)... Bethesda, MD (PRWEB) , ... October 12, 2017 , ... ... Award of Excellence to Carol Friedman, PhD, FACMI, during the Opening Session of AMIA’s ... 4 – 8. , In honor of Morris F. Collen, a pioneer in the ...
(Date:10/12/2017)... Rockville, Maryland (PRWEB) , ... October 12, 2017 ... ... a magnetic drug delivery system that we intend to develop to enable prevention ... regimens can lead to severe hearing loss, especially in pediatric patients. For cisplatin, ...
(Date:10/12/2017)... ... October 12, 2017 , ... HMP , a leader in healthcare events ... Magazine Eddie Digital Award for ‘Best B-to-B Healthcare Website.’ Winners were announced during the ... The annual award competition recognizes editorial and design excellence across a range of sectors. ...
(Date:10/12/2017)... (PRWEB) , ... October 12, 2017 , ... On Saturday, ... a treadmill relay – Miles by Moonlight to raise money for the American Heart ... or more. , Teams will work together to keep their treadmills moving for ...
(Date:10/12/2017)... ... October 12, 2017 , ... Health Literacy Innovations (HLI), ... software tool, and the Cancer Patient Education Network (CPEN), an independent professional organization ... a new strategic alliance. , As CPEN’s strategic partner, HLI will help ...
Breaking Medicine News(10 mins):
(Date:10/2/2017)... 2017 Diplomat Pharmacy, Inc. (NYSE: ... Consulting, LLC , and named its founder as Diplomat,s ... Tennessee , will operate under Diplomat ... service offerings for health care partners to include IT ... "In an interoperable world, technology delivers comprehensive ...
(Date:10/2/2017)... PHILADELPHIA , Oct. 2, 2017 Halo Labs announces ... particle analysis system called the HORIZON at MIBio 2017 in ... analyzes subvisible and visible particulate matter in biopharmaceutical samples with unprecedented ... use of the novel technique Backgrounded Membrane Imaging. ... The HORIZON subvisible particle analysis system ...
(Date:9/28/2017)... Sept. 28, 2017 Cohen Veterans Bioscience and ... use of wearable and home sensors for real-time monitoring ... Signal Foundation, a nonprofit organization focused on disruptive health ... an affordable analytical system to record and integrate behavioral, ... ...
Breaking Medicine Technology: