HOME >> BIOLOGY >> NEWS
Extreme climate variance sped extinction of local butterfly populations, researchers say

Don't it always seem to go
That you don't know what you've got
Till it's gone.
They paved paradise
And put up a parking lot.
-Joni Mitchell, "Big Yellow Taxi"

Going, going, gone.

Since 1960, population biologist Paul Ehrlich and his research group have been conducting a classic study of the population of Jasper Ridge's Bay checkerspot butterflies, subspecies Euphydryas editha bayensis. But now the biologists won't have to muck about the ridge counting insects as they have for decades to characterize rates of births, deaths, immigrations and emigrations. The last two Jasper Ridge populations went extinct in 1991 and 1998. Examining 70 years of rainfall and population data, the researchers now conclude that extreme swings in regional climate hastened extinction of the butterflies. They report their findings in the April 30 issue of the Proceedings of the National Academy of Sciences.

"This is the first time anyone has documented the effects of weather variation linked to climate change on extinction of populations," says Ehrlich, the Bing Professor of Population Studies. Previous studies have looked at shifts in average conditions - say, the climate becomes drier or wetter overall - or the effects of a single extreme climate event, such as a hard freeze. The Stanford study instead examined the effect of climate variability - swings in rainfall highs and lows - on extinction, and tied the extinctions tightly to a mechanism. "People have long been aware of the problem of species extinctions, but are just beginning to realize the importance of population extinctions."

Not only are population extinctions a prelude to species extinctions, but they also threaten the vital ecosystem services upon which human life depends. Stanford's Center for Conservation Biology has pioneered investigations of population extinctions, in part because of the Ehrlich group's observations on the extirpation of checker
'"/>

Contact: Dawn Levy
dawnlevy@stanford.edu
650-725-1944
Stanford University
14-May-2002


Page: 1 2 3 4 5

Related biology news :

1. Extreme stretch-growth of axons
2. Extreme 2003 takes students worldwide to the oceans depth
3. For First Time In 40 Years National Jewish Researchers Report Chronic Beryllium Disease Caused By Extremely Low Levels Of Exposure
4. The Fire Down Below: Extreme Heat-Loving Organisms May Be Keys To Molecular Evolution, Origin Of Life, New Book Argues
5. Virginia Tech Scientists Studying Cells From Extreme Environments
6. K-State, other universities to study how climate affects plant evolution
7. Modest climate change could lead to substantially more and larger fires
8. Evidence for the impact of climate change on deep-sea biodiversity
9. Duke study disputes idea that trees can relocate quickly in response to climate change
10. New version of premier global climate model released
11. Trapping carbon in soil key for protecting global food security, dealing with climate change

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/14/2016)... Israel , April 14, 2016 ... Authentication and Malware Detection, today announced the appointment of ... assumed the new role. Goldwerger,s leadership appointment ... on the heels of the deployment of its platform ... BioCatch,s behavioral biometric technology, which discerns unique cognitive and ...
(Date:3/31/2016)... 31, 2016  Genomics firm Nabsys has completed a ... Barrett Bready , M.D., who returned to the company ... technical leadership team, including Chief Technology Officer, John ... Steve Nurnberg and Vice President of Software and Informatics, ... Dr. Bready served as CEO of Nabsys ...
(Date:3/22/2016)... 22, 2016 According ... Market for Consumer Industry by Type (Image, Motion, ... (Communication & IT, Entertainment, Home Appliances, & ... to 2022", published by MarketsandMarkets, the market ... reach USD 26.76 Billion by 2022, at ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... Diego, Calif. (PRWEB) , ... May 25, 2016 , ... ... Diego area and has consistently been rated one of its top attractions. Fortune ... the globe to participate in a unique and intimate team-building experience. , Each event ...
(Date:5/25/2016)... ... May 25, 2016 , ... The ... fracture-specific plating options designed to address fractures of the distal tibia and fibula. ... The Acumed Ankle Plating System 3 is composed of seven plate families that ...
(Date:5/25/2016)... ... 2016 , ... The American Medical Informatics Association (AMIA) responded ... Coordinator for Health IT (ONC) outlining a measurement approach to interoperability that focuses ... and where it was needed. The organization of health informatics professionals said a ...
(Date:5/25/2016)... ... May 25, 2016 , ... WEDI, the nation’s leading ... today announced that Charles W. Stellar has been named by the WEDI Board of ... January 2016. As an executive leader with more than 35 years of experience in ...
Breaking Biology Technology:
Cached News: