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World Plants Near Extinction Close to 50 Pct.-Study
Thu Oct 31, 2:21 PM ET
By Christopher Doering

WASHINGTON (Reuters) - The percentage of the world's plants threatened with extinction is much larger than commonly believed, and could be as high as 47 percent if tropical species are included, researchers said on Thursday

The study, published in the November issue of Science, challenges earlier research that estimated the number of species in danger of extinction was about 13 percent.

Previous studies of extinct plants underestimated the numbers because they failed to include many plants growing in tropical countries such as Ecuador and Colombia.

Plants are becoming extinct for many reasons, including global warming (news - web sites) and human encroachment into area habitats, said Peter Jorgensen, a researcher at the Missouri Botanical Gardens in St. Louis who coauthored the new study.

For example, scientists discovered a single collection of the passion flower, a light purple flower found only in southern Ecuador, during the 1970s, Jorgensen said. But recent trips to the region have found the species has since disappeared.

Jorgensen reviewed data from 189 countries and territories and determined that between 310,000 and 422,000 plants -- or 22 to 47 percent -- could be threatened.

In previous studies "if you can't evaluate a species you basically don't include it," Jorgensen said in a telephone interview.

"Still, we don't know enough ... to go out and do something active on the ground to save them," he said. "Just because there are more of them doesn't mean it's easier."

Identifying threatened species is a crucial step toward developing better management plans to protect them, but Jorgensen conceded it will take a large amount of money to develop such projects.

Maintaining a global database of threatened plants would cost an estimated $12.1 million annually, the researchers said.

The vast majority of plants that are threatened in tropical areas are those located with a wide variety of plant life or where habitat loss is rapidly occurring.

As a model for their research, Jorgensen and his coauthor, Nigel Pitman from Duke University, analyzed more than 4,000 species that are native to Ecuador.

After sifting through data and determining those that could be on the verge of extinction -- such as plants with small populations or which are located only in a small geographical area -- they determined that 83 percent of all plants in the country are threatened.

The findings for Ecuador are important, Jorgensen said, because the country has one of the most complete databases of plant species. Such results also can be applied to neighboring countries such as Peru and Colombia where data are scarce.

"We know so little about plants in tropical regions," said Jorgensen. "And what really bothers me is we have to guess so much because we don't have enough manpower to go through all the countries."

http://story.news.yahoo.com/news?tmpl=story2&cid=570&ncid=570&e=2&u=/nm/20021031/sc_nm/science_plants_dc_1

sakina

Posted: 02-12-2002 00:03 Post subject:

Then there's the good old market economy lending a helping hand

http://www.cnn.com/2002/TECH/science/11/29/mutant.crops.reut/index.html

I can't help feeling we're going to unleash something terrible purely in the name of profit and patents.

Posted: 02-12-2002 00:39 Post subject:

It makes me sick!!

I could name and identify any plant (minus a few grasses and mosses) from Scotland but I have always known that my lands plants are a mere fraction of those to be found elsewhere.

I have not finished learning about them.

Posted: 02-12-2002 00:46 Post subject:

Playing devils advocate here, but does it really matter, I mean will there be any adverse effects on future civilisations?