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:4/14/2015)... YORK , April 14, 2015  HYPR ... IDentity Online (FIDO ® ) Alliance tm , ... specifications. FIDO members commit to share technology and ... methods that are interoperable, more secure and private, ... enable biometric identity verification that protects sensitive user ...
(Date:4/13/2015)... 2015 According to a ... Market Forecast & Opportunities, 2020", the global biometrics market ... 14% till 2020. The biometrics market is garnering ... and review of biometric management systems. The constant ... with greater efficiency, are resulting in increasing installation ...
(Date:4/10/2015)... Research and Markets ( http://www.researchandmarkets.com/research/cjk4gb/security ) has ... - NEC" report to their offering. ... to supply a range of IT security management and ... on the development of a Big Data and cloud ... Asia-Pacific region is a core ...
Breaking Biology News(10 mins):HYPR Corp. Joins the FIDO Alliance 2HYPR Corp. Joins the FIDO Alliance 3Global Biometrics Market to Cross US$ 21 Billion by 2020: TechSci Research 2NEC Security Competitive Profile 2015 2
... As the desert Southwest becomes hotter and drier, ... dominated by mesquite trees, such as Prosopis velutina, and ... researchers has found. In a "leaf-to-landscape" approach, the ... across entire ecosystems to quantify how well grasslands, compared ...
... Bonheur Professor Russell Chesney, M.D. believes he knows what was ... Christmas Carol." Based on detailed descriptions of both the ... hypothesizes that Tiny Tim suffered from a combination of rickets ... March 5 edition of Archives of Pediatrics and Adolescent ...
... now 20 years old, and its network of protected areas, known ... start, the network now includes some 26 000 protected sites and ... significant areas of sea. It is widely considered to be the ... criteria. The review has been published in the newly ...
Cached Biology News:Mesquite trees displacing Southwestern grasslands 2Mesquite trees displacing Southwestern grasslands 3Mesquite trees displacing Southwestern grasslands 4Mesquite trees displacing Southwestern grasslands 5Building the European Union's Natura 2000 -- the largest ever network of protected areas 2
(Date:5/20/2015)... 20, 2015 Research and Markets ( ... "Top Technologies in HW_Technical Insights" report to their ... evaluated technology trends in the Health and Wellness sector ... to have an impact in the year 2015. The ... top 10 health and wellness technologies that are anticipated ...
(Date:5/20/2015)... , May 20, 2015  Select Medical ... the Federal Trade Commission granted early termination of ... Improvements Act of 1976, as amended, applicable to ... Acquisition Corporation, a joint venture that Select has ... As previously announced, MJ Acquisition Corporation ...
(Date:5/20/2015)... 20, 2015 Agricultural firm H.J. Baker ... its acquisition of Tiger-Sul. Since the purchase of ... Canada) in May 2005, H.J. Baker has leveraged the ... into a comprehensive portfolio of product offerings and solutions ... Baker and the innovation of Tiger-Sul, transforming the company ...
(Date:5/20/2015)... , May 20, 2015  Cypher Genomics, ... a collaboration with Celgene Corporation to apply Cypher,s ... biomarkers that associate with patient response to innovative ... intended to help accelerate patient access to the ... in clinical research and development and potentially inform ...
Breaking Biology Technology:Top Technologies in the Health and Wellness Industry 2015 2Select Medical Corporation's Proposed Acquisition of Concentra Inc. through Joint Venture with Welsh Carson Receives Antitrust Clearance 2Agricultural Firm H.J. Baker & Bro., Inc., Celebrates 10 Years Since Acquisition Of Tiger-Sul 2Agricultural Firm H.J. Baker & Bro., Inc., Celebrates 10 Years Since Acquisition Of Tiger-Sul 3Cypher Genomics Collaborates with Celgene Corporation to Identify Novel Genomic Biomarkers 2
... , SAN DIEGO, Nov. 24, 2009 Arena Pharmaceuticals, ... company is scheduled to present at the Piper Jaffray 21st Annual ... Time (8:30 a.m. Pacific Time) at the New York Palace Hotel ... Officer, is scheduled to provide an overview of the company, including ...
... , BOZEN, Italy, ... formed a new Canadian joint venture with a group ... under the,name Health Robotics Canada, Inc. and will market, ... concept, which includes the,revolutionary product offerings i.v.STATION(TM), i.v.SOFT(TM), and ...
... ... Abstracts Service (CAS), the global expert on chemical information, reports that China,s ... in chemistry. China trailed Japan,s patent office, the World Intellectual Property Organization ... than a decade, but passed the USPTO in 2005, WIPO in 2006, ...
Cached Biology Technology:Arena Pharmaceuticals to Present at the Piper Jaffray 21st Annual Health Care Conference 2Arena Pharmaceuticals to Present at the Piper Jaffray 21st Annual Health Care Conference 3Health Robotics Continues its Global Expansion With December 09 ASHP's Launch of Joint Venture in Canada 2Health Robotics Continues its Global Expansion With December 09 ASHP's Launch of Joint Venture in Canada 3China Leads All Nations in Publication of Chemical Patents According to CAS, the World's Most Authoritative Publisher of Chemical Information 2China Leads All Nations in Publication of Chemical Patents According to CAS, the World's Most Authoritative Publisher of Chemical Information 3
Mouse monoclonal [6911] to E. coli K99 pilus ( Abpromise for all tested applications)....
...
... HyPer is the first fully genetically ... detection of intracellular hydrogen peroxide (H2O2), one ... Developed on the basis of yellow fluorescent ... Escherichia coli protein OxyR (OxyR-RD), HyPer demonstrates ...
Alexa Fluor 647 anti-mouse Qa-2...
Biology Products: