Featured Research

from universities, journals, and other organizations

Extinction Rate Across The Globe Reaches Historical Proportions

Date:
January 10, 2002
Source:
University Of Texas, Austin
Summary:
Half of all living bird and mammal species will be gone within 200 or 300 years, according to a botany professor at The University of Texas at Austin.

AUSTIN, Texas -- Half of all living bird and mammal species will be gone within 200 or 300 years, according to a botany professor at The University of Texas at Austin.

Related Articles


Although the extinction of various species is a natural phenomenon, the rate of extinction occurring in today's world is exceptional -- as many as 100 to1,000 times greater than normal, Dr. Donald A. Levin said in the January-February issue of American Scientist magazine. The co-author is Levin's son, Phillip S. Levin, a National Marine Fisheries Service biologist who is an expert on the demography of fish, especially salmon.

Levin's column noted that on average, a distinct species of plant or animal becomes extinct every 20 minutes. Donald Levin, who works in the section of integrative biology in the College of Natural Sciences, said research shows the rate of current loss is highly unusual -- clearly qualifying the present period as one of the six great periods of mass extinction in the history of Earth.

"The numbers are grim," he said. "Some 2,000 species of Pacific Island birds (about 15 percent of the world total) have gone extinct since human colonization. Roughly 20 of the 297 known mussel and clam species and 40 of about 950 fishes have perished in North America in the last century. The globe has experienced similar waves of destruction just five times in the past."

Biological diversity ultimately recovered after each of the five past mass extinctions, probably requiring several million years in each instance. As for today's mass extinction, Levin said some ecologists believe the low level of species diversity may become a permanent state, especially if vast tracts of wilderness area are destroyed.

Other experts, in contrast, say breaking up today's vast ranges into smaller habitats could promote the evolution of new species. That's because populations of the same type of organism that are separated from each other may diverge over time. As populations are reduced in size, genetic changes may accumulate more rapidly. Another reason diversity may rebound -- as it normally does after a major extinction episode -- is that disturbances caused by human beings do not eliminate habitats, but merely change them.


Story Source:

The above story is based on materials provided by University Of Texas, Austin. Note: Materials may be edited for content and length.


Cite This Page:

University Of Texas, Austin. "Extinction Rate Across The Globe Reaches Historical Proportions." ScienceDaily. ScienceDaily, 10 January 2002. <www.sciencedaily.com/releases/2002/01/020109074801.htm>.
University Of Texas, Austin. (2002, January 10). Extinction Rate Across The Globe Reaches Historical Proportions. ScienceDaily. Retrieved January 31, 2015 from www.sciencedaily.com/releases/2002/01/020109074801.htm
University Of Texas, Austin. "Extinction Rate Across The Globe Reaches Historical Proportions." ScienceDaily. www.sciencedaily.com/releases/2002/01/020109074801.htm (accessed January 31, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Saturday, January 31, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Nanoscale Sensor Could Help Wine Producers and Clinical Scientists

Nanoscale Sensor Could Help Wine Producers and Clinical Scientists

Reuters - Innovations Video Online (Jan. 30, 2015) A nanosensor that mimics the oral effects and sensations of drinking wine has been developed by Danish and Portuguese researchers. Jim Drury saw it in operation. Video provided by Reuters
Powered by NewsLook.com
Dog-Loving Astronaut Wins Best Photo of 2015

Dog-Loving Astronaut Wins Best Photo of 2015

Buzz60 (Jan. 30, 2015) Retired astronaut and television host, Leland Melvin, snuck his dogs into the NASA studio so they could be in his official photo. As Mara Montalbano (@maramontalbano) shows us, the secret is out. Video provided by Buzz60
Powered by NewsLook.com
U.S. Wants to Analyze DNA from 1 Million People

U.S. Wants to Analyze DNA from 1 Million People

Reuters - US Online Video (Jan. 30, 2015) The U.S. has proposed analyzing genetic information from more than 1 million American volunteers to learn how genetic variants affect health and disease. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Rarest Cat on Planet Caught Attacking Monkeys on Camera

Rarest Cat on Planet Caught Attacking Monkeys on Camera

Buzz60 (Jan. 30, 2015) An African Golden Cat, the rarest large cat on the planet was recently caught on camera by scientists trying to study monkeys. The cat comes out of nowhere to attack those monkeys. Patrick Jones (@Patrick_E_Jones) has the rest. Video provided by Buzz60
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:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

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