Navigation Links
The mystery of mass extinctions is no longer murky
Date:6/17/2008

If you are curious about Earth's periodic mass extinction events such as the sudden demise of the dinosaurs 65 million years ago, you might consider crashing asteroids and sky-darkening super volcanoes as culprits.

But a new study, published June 15, 2008, in the journal Nature, suggests that it is the ocean, and in particular the epic ebbs and flows of sea level and sediment over the course of geologic time, that is the primary cause of the world's periodic mass extinctions over the past 500 million years.

"The expansions and contractions of those environments have pretty profound effects on life on Earth," says Shanan Peters, a University of Wisconsin-Madison assistant professor of geology and geophysics and the author of the new Nature report. In short, according to Peters, changes in ocean environments related to sea level exert a driving influence on rates of extinction, which animals and plants survive or vanish, and generally determine the composition of life in the oceans.

Since the advent of life on Earth 3.5 billion years ago, scientists think there may have been as many as 23 mass extinction events, many involving simple forms of life such as single-celled microorganisms. Over the past 540 million years, there have been five well-documented mass extinctions, primarily of marine plants and animals, with as many as 75-95 percent of species lost. For the most part, scientists have been unable to pin down the causes of such dramatic events. In the case of the demise of the dinosaurs, scientists have a smoking gun, an impact crater that suggests dinosaurs were wiped out as the result of a large asteroid crashing into the planet. But the causes of other mass extinction events have been murky, at best.

"No matter what the ultimate driving extinction mechanisms might be at any one time, Professor Peters brings the repeated and resultant extinction on oceanic shelves front and forward where it belongs," sa
'/>"/>

Contact: Diane Banegas
dbanegas@nsf.gov
703-292-4489
National Science Foundation
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Scientists tackle mystery mountain illness
2. Folate mystery finally solved
3. Men shed light on the mystery of human longevity, study finds
4. Magnetic snakes control fluids, gravity-defying droplets, and solving a dragonfly mystery
5. Cassini on the trail of a runaway mystery
6. Time-sharing tropical birds key to evolutionary mystery
7. 480-million-year-old fossil sheds light on 150-year-old paleontological mystery
8. ASU professor helps solve mystery of glassy water
9. Ancient mystery solved
10. UCLA researchers solve decade-old mystery
11. Has the mystery of the Antarctic ice sheet been solved?
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
The mystery of mass extinctions is no longer murky
(Date:7/21/2015)... , July 21, 2015  NXT-ID, Inc. (NASDAQ: ... biometric authentication company focused on the growing mobile ... wallet, announces that it has filed provisional patent ... Method. This invention highlights next ... authorizes an account, but also the user using ...
(Date:7/9/2015)... SAN JOSE, Calif. , July 9, 2015 /PRNewswire/ ... human interface solutions, announced today that it will report ... 2015 on Thursday, July 30, 2015 after the close ... call for analysts and investors at 2:00 p.m. PT ... information.    To participate on the live ...
(Date:7/8/2015)... NEW YORK , July 8, 2015  BD ... announced BD & Guidepoint Mentor, a new ... to Guidepoint,s expert network services. BD ... technologies to improve healthcare delivery and outcomes and, with ... start-up entrepreneur will be able to directly engage with ...
Breaking Biology News(10 mins):NXT-ID Patents Personalized Tokenized Payments for Next Generation Secure Payment Technology 2NXT-ID Patents Personalized Tokenized Payments for Next Generation Secure Payment Technology 3NXT-ID Patents Personalized Tokenized Payments for Next Generation Secure Payment Technology 4Synaptics to Report Fourth Quarter, Fiscal Year 2015 Results on July 30 2BD and Guidepoint Team to Connect Healthcare Start-up Companies With Business and Scientific Experts 2BD and Guidepoint Team to Connect Healthcare Start-up Companies With Business and Scientific Experts 3
... in organic crop production is increasing around the ... environmental benefits and decreasing the amount of synthetic ... gain popularity with consumers, organic farmers are faced ... invasive weeds. Synthetic mulches, manufactured from petroleum-based ...
... relies on composted waste materials and byproducts, such as ... as a necessary nutrient source. Studies have shown that ... and hair salons, combined with additional compost, is an ... become commercially available to crop producers in the past ...
... UC Davis Cancer Center researchers report today the discovery ... form of cancer. The finding, which is published in ... of Nuclear Medicine and Molecular Imaging , provides hope ... the most common and aggressive type of primary brain ...
Cached Biology News:Organic plant waste proves effective weed control for citrus trees 2Organic plant waste proves effective weed control for citrus trees 3New use for human hair 2UC Davis researchers find molecule that targets brain tumors 2
(Date:7/31/2015)... China Cord Blood Corporation (NYSE: CO) ("CCBC" ... provider of cord blood collection, laboratory testing, hematopoietic stem ... that the Company has filed its Annual Report on ... The filed Form 20-F includes audited financial statements for ... 20-F can be accessed by visiting the U.S. Securities ...
(Date:7/31/2015)... ... July 31, 2015 , ... ... detection and quantification of partially hydrolyzed gluten in foods, has been accepted by ... the method “Partially Hydrolyzed Gluten in Fermented Cereal-Based Products by R5 Competitive ELISA,” ...
(Date:7/30/2015)... , ... July 31, 2015 , ... Ralco is honored ... at the Lyon County Fair to be held August 5-9 in Marshall. The Ralco ... their meals come from and how agriculture impacts their daily lives. This unique exhibit ...
(Date:7/30/2015)... 2015 AACC welcomed thousands of medical ... Annual Meeting & Clinical Lab Expo in ... meeting showcased revolutionary advancements in clinical testing technology ... providers to diagnose patients quickly and accurately and ... As of Wednesday, July 29, more ...
Breaking Biology Technology:China Cord Blood Corporation Files Its Annual Report on Form 20-F 2RIDASCREEN® Competitve Gliadin Receives AOAC Official First Action Status 2Ralco Announces Primary Sponsorship of Ralco Enrichment Center at Lyon County Fair 2Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 2Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 3Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 4
... is available in German . Leica ... and the German Cancer Research Center (DKFZ) for the development ... microscopy. This gives Leica Microsystems the license to develop the ... put it on the market. Stefan Hell, Director at ...
... dba Discharge 1-2-3 of Schaumburg, IL has ... Chicago Innovation Awards for their Discharge 1-2-3 Composer™. ... Harris Theater on Tuesday, November 8, with more than 1400 ... is the Chicago region,s foremost recognition of the most innovative ...
... by which a bacterial pathogen causes the deadly tropical disease ... The findings are published today in the journal ... the bacterium Burkholderia pseudomallei kills cells by preventing protein synthesis. ... way for the development of novel therapies to combat the ...
Cached Biology Technology:Gated STED -- developing the next generation of super-resolution microscopes 2Callibra, Inc. dba Discharge 1-2-3 is Named Winner of 2011 Chicago Innovation Award 2Callibra, Inc. dba Discharge 1-2-3 is Named Winner of 2011 Chicago Innovation Award 3Scientists defuse the 'Vietnam time bomb' 2
XPC Immunogen: XPC (NP_004619, 141 a.a. ~ 251 a.a) partial recombinant protein with GST tag. Storage: -20 C, Avoid Freeze/Thaw Cycles *Available for distribution in the US only...
Rabbit polyclonal to Lck (phospho Y192) ( Abpromise for all tested applications). entrezGeneID: 3932 SwissProtID: P06239...
Anti 7H6 Antigen (tight-junction associated protein Antigen) Monoclonal Antibody 7H6...
Goat polyclonal to Ephrin B2 ( Abpromise for all tested applications). entrezGeneID: 1948 SwissProtID: P52799...
Biology Products: