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:6/26/2016)... Charlotte, NC (PRWEB) , ... June 26, 2016 , ... Brent Kasmer, a legally blind ... able to be personalized through a fitness app. The fitness app plans to fix the ... solutions currently only offer a one size fits all type program , They ...
(Date:6/25/2016)... ... June 25, 2016 , ... ... and applications at AcademyHealth’s Annual Research Meeting June 26-28, 2016, at the Hynes ... important health care topics including advance care planning, healthcare costs and patient and ...
(Date:6/25/2016)... ... 2016 , ... The temporary closing of Bruton Memorial Library on June 21 due to a ... new, often overlooked aspect of head lice: the parasite’s ability to live away from a ... occurrence, but a necessary one in the event that lice have simply gotten out of ...
(Date:6/25/2016)... TX (PRWEB) , ... June 25, 2016 , ... ... the United States, named Dr. Sesan Ogunleye, as the Medical Director of its new ... the facility Medical Director of our new Mesquite location,” said Dr. James M. Muzzarelli, ...
(Date:6/25/2016)... ... June 25, 2016 , ... Dr. ... from injury. Recently, he has implemented orthobiologic procedures as a method for treating ... one of the first doctors to perform the treatment. Orthobiologics are substances that ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... -- Roche (SIX: RO, ROG; OTCQX: RHHBY) announced that ... PCT (procalcitonin) assay as a dedicated testing solution for ... clearance, Roche is the first IVD company in the ... risk assessment and management. PCT is a ... in blood can aid clinicians in assessing the risk ...
(Date:6/23/2016)... , , , WHEN: ... , , , , LOCATION: , , , Online, with ... , EXPERT PANELISTS:  , , , Frost & Sullivan,s Global Vice ... Senior Industry Analyst, Divyaa Ravishankar and Unmesh Lal, Program Manager , ... industry is witnessing an exceptional era. Several new demand spaces, such ...
(Date:6/23/2016)... -- The vast majority of dialysis patients currently receive ... usually 3 times a week, with treatment times averaging ... equipment preparation and wait time.  This regimen can be ... who are elderly and frail.  Many elderly dialysis patients ... for some duration of time. Residents in ...
Breaking Medicine Technology: