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:4/13/2017)... 13, 2017 UBM,s Advanced Design and Manufacturing ... feature emerging and evolving technology through its 3D Printing ... run alongside the expo portion of the event and ... demonstrations focused on trending topics within 3D printing and ... manufacturing event will take place June 13-15, 2017 at the ...
(Date:4/11/2017)... BEACH GARDENS, Fla. , April 11, 2017 ... identity management and secure authentication solutions, today announced ... contract by Intelligence Advanced Research Projects Activity (IARPA) ... for IARPA,s Thor program. "Innovation has ... onset and IARPA,s Thor program will allow us ...
(Date:4/11/2017)... , April 11, 2017 No two ... researchers at the New York University Tandon School ... Engineering have found that partial similarities between prints ... used in mobile phones and other electronic devices ... The vulnerability lies in the fact that ...
Breaking Biology News(10 mins):
(Date:6/22/2017)... ... 22, 2017 , ... AESKU.GROUP, an innovation leader in ... Technologien GmbH, thereby expanding its product portfolio to include allergy and food intolerance ... atopic eczema or a food allergy. Allergies are escalating to epidemic proportions and ...
(Date:6/22/2017)... ... June 22, 2017 , ... For the months of ... a Spotlight series on “Cell Therapy Regulation” for its regenerative medicine ... on the unique regulatory challenges of stem cell medical research. , Stem cell ...
(Date:6/22/2017)... (PRWEB) , ... June 22, 2017 , ... The first ... took 20 years until the first data on cross-contamination of human cell lines with ... been an increasing issue in cell culture labs and is associated with dramatic consequences ...
(Date:6/22/2017)... ... June 22, 2017 , ... Charm Sciences, Inc. is pleased to ... was determined to be appropriate as a screening test at dairies and farms for ... EZ system, and the Charm EZ Lite system. These systems are a combination incubator ...
Breaking Biology Technology:
Cached News: