Navigation Links
Researchers quantify toxic ocean conditions during major extinction 93.9 million years ago
Date:10/28/2013

RIVERSIDE, Calif. Oxygen in the atmosphere and ocean rose dramatically about 600 million years ago, coinciding with the first proliferation of animal life. Since then, numerous short lived biotic events typically marked by significant climatic perturbations took place when oxygen concentrations in the ocean dipped episodically.

The most studied and extensive of these events occurred 93.9 million years ago. By looking at the chemistry of rocks deposited during that time period, specifically coupled carbon and sulfur isotope data, a research team led by University of California, Riverside biogeochemists reports that oxygen-free and hydrogen sulfide-rich waters extended across roughly five percent of the global ocean during this major climatic perturbation far more than the modern ocean's 0.1 percent but much less than previous estimates for this event.

The research suggests that previous estimates of oxygen-free and hydrogen sulfide-rich conditions, or "euxinia," were too high. Nevertheless, the limited and localized euxinia were still sufficiently widespread to have dramatic effect on the entire ocean's chemistry and thus biological activity.

"These conditions must have impacted nutrient availability in the ocean and ultimately the spatial and temporal distribution of marine life," said team member Jeremy D. Owens, a former UC Riverside graduate student, who is now a postdoctoral scientist at the Woods Hole Oceanographic Institution. "Under low-oxygen environments, many biologically important metals and other nutrients are removed from seawater and deposited in the sediments on the seafloor, making them less available for life to flourish."

"What makes this discovery particularly noteworthy is that we mapped out a landscape of bioessential elements in the ocean that was far more perturbed than we expected, and the impacts on life were big," said '/>"/>

Contact: Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050
University of California - Riverside
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Study by UC Santa Barbara researchers suggests that bacteria communicate by touch
2. UC Santa Barbara researchers discover genetic link between visual pathways of hydras and humans
3. Researchers attempt to solve problems of antibiotic resistance and bee deaths in one
4. UNH researchers find African farmers need better climate change data to improve farming practices
5. Ottawa researchers to lead world-first clinical trial of stem cell therapy for septic shock
6. Researchers uncover molecular pathway through which common yeast becomes fungal pathogen
7. Researchers print live cells with a standard inkjet printer
8. Columbia Engineering and Penn researchers increase speed of single-molecule measurements
9. Researchers reveal how a single gene mutation leads to uncontrolled obesity
10. Researchers discover novel therapy for Crohns disease
11. New paper by Notre Dame researchers describes method for cleaning up nuclear waste
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/25/2014)... era, 100,000s of people lived on the land now ... to control the availability of plants they used for ... use fire to maintain desired habitat and natural resources. ... Service,s Pacific Southwest Station, will lead a field ... during the Ecological Society of America,s 99th Annual Meeting, ...
(Date:7/25/2014)... Boston, MA A study published online in the ... describes a novel approach to preventing cervical cancer based ... cervical cancer after removal of a discrete population of ... from a study that looked at squamocolumnar junction cells, ... canal and have been implicated as the origins of ...
(Date:7/25/2014)... opened the way for the development of new lines of ... barley production is second only to wheat with 7-8 million ... important diseases of barley. , Senior Research Scientist Dr Alan ... on the cell walls of barley plants that block the ... by the ARC Centre of Excellence in Plant Cell Walls ...
Breaking Biology News(10 mins):Fire ecology manipulation by California native cultures 2Fire ecology manipulation by California native cultures 3Clearing cells to prevent cervical cancer 2New hope for powdery mildew resistant barley 2
... Parrots, long a favorite pet animal, are attractive to owners ... more to parrots than what meets the eye. , For ... an unusual set of pigments to produce their rainbow of ... an Arizona State University researcher has uncovered the chemistry behind ...
... study ever done comparing the effectiveness of hand hygiene ... of disease-causing viruses than simply washing one’s hands with ... soapy hand washing flushes down the drain is the ... cause hepatitis A, acute gastroenteritis and a host of ...
... compounds that zero in on cancer cells spreading throughout ... give doctors a whole new weapon in the fight ... of Cornell University researchers. , The compounds, called synthetic ... breast cancer cells in mice, and are the first ...
Cached Biology News:ASU researchers finds novel chemistry at work to provide parrot's vibrant red colors 2ASU researchers finds novel chemistry at work to provide parrot's vibrant red colors 3Study: Soap And Water Work Best In Ridding Hands Of Disease Viruses 2Study: Soap And Water Work Best In Ridding Hands Of Disease Viruses 3First-ever Compounds To Target Only Metastatic Cells Are Highly Effective Against Breast, Prostate, And Colon Cancers 2First-ever Compounds To Target Only Metastatic Cells Are Highly Effective Against Breast, Prostate, And Colon Cancers 3
(Date:7/25/2014)... 2014 WABC Radio show out of New ... Lorry Young will be hosting California-based Vet-Stem, Inc.’s Founder and ... therapy in pets. Dr. Harman first visited the show ... therapy for pets suffering from osteoarthritis and other degenerative diseases, ... industry forward. , Young has invited Dr. Harman back to ...
(Date:7/25/2014)... 2014 Lawrence Livermore scientists Charles Westbrook ... list of " The World's Most Influential Scientific Minds ... 3,000 researchers who were identified by analyzing citation data ... published the highest-impact work (2002-2012 and 2012-2013). The two ... combustion modeling . , "This recognition is a great ...
(Date:7/25/2014)... July 25, 2014 /PRNewswire-iReach/ -- Xybion Corporation, the ... global corporations operating in highly regulated industries, announced ... annual Global User Group Conference, Xybion International Exchange, ... Philadelphia, Pennsylvania at the Sheraton Society ... This year,s conference theme ...
(Date:7/25/2014)... -- Sinovac Biotech Ltd. (Nasdaq: SVA ), a ... , today announced that it will release its unaudited financial ... market close on Thursday, August 14, 2014 EDT. The Company ... on Friday, August 15, 2014, at 8:00 a.m. EDT (Friday, ... review the Company,s financial results and provide an update on ...
Breaking Biology Technology:Robert J. Harman, DVM, Founder and CEO of Vet-Stem, Inc. to Join New York Radio Host Lorry Young in Upcoming Episode of A “Paws” For Your Pet 2Robert J. Harman, DVM, Founder and CEO of Vet-Stem, Inc. to Join New York Radio Host Lorry Young in Upcoming Episode of A “Paws” For Your Pet 3Scientists Burst onto Influential List for Combustion Research 2Scientists Burst onto Influential List for Combustion Research 3Scientists Burst onto Influential List for Combustion Research 4Xybion Announces It Will Host International User Conference in Philadelphia 2Xybion Announces It Will Host International User Conference in Philadelphia 3Sinovac to Host Conference Call to Report Second Quarter 2014 Unaudited Financial Results 2
... a term popularized by columnist Tom Friedman, requires (well) ... learning and development of knowledge and skills. Organizations that ... creating enriching workplace experiences if they wish to attract ... can you create an enriching workplace? It isn't easy ...
... that might play an important role in rapidly detecting ... is close to passing a validation test being conducted ... MultiCode panel technology, which is being developed by ... "thumbs up" Wednesday from James E. Gern, professor of ...
... mobile, nor completely the Internet. Mobile devices hardly have ... experience, and mobile networks are not ubiquitous, high-bandwidth or ... we've come to expect quick access to information. So ... with a fairly poor mobile Web experience. , ,This ...
Cached Biology Technology:Seven talent management practices that matter 2Seven talent management practices that matter 3Seven talent management practices that matter 4Seven talent management practices that matter 5EraGen diagnostic passes UW tests, could quickly detect bird flu 2EraGen diagnostic passes UW tests, could quickly detect bird flu 3Webaroo aims to make mobile search relevant 2