Navigation Links
Scientists solve a 14,000-year-old ocean mystery
Date:7/14/2013

fer scientists a look back through time at what has accumulated therehave repeatedly found evidence of this burst, in the form of a layer of increased opal and calcium carbonate, the materials that made up phytoplankton and foraminifera shells. But no one had searched the fossil record specifically for signs that iron from the continental shelf played a part in the bloom.

Lam and an international team of colleagues revisited the sediment core data to directly test this hypothesis. They sampled GGC-37, a core taken from a site near Russia's Kamchatka Peninsula, about every 5 centimeters, moving back through time to before the biological bloom began. Then they analyzed the chemical composition of their samples, measuring the relative abundance of the isotopes of the elements neodymium and strontium in the sample, which indicates which variant of iron was present. The isotope abundance ratios were a particularly important clue, because they could reveal where the iron came fromone variant pointed to iron from the ancient Loess Plateau of northern China, a frequent source of iron-rich dust in the northwest Pacific, while another suggested the younger, more volcanic continental shelf was the iron source.

What the researchers found surprised them.

"We saw the flux of iron was really high during glacial times, and that it dropped during deglaciation," Lam says. "We didn't see any evidence of a pulse of iron right before this productivity peak."

The iron the researchers did find during glacial times appeared to be supplemented by a third source, possibly in the Bering Sea area, but it didn't have a significant effect on the productivity peak. Instead, the data suggest that iron levels were declining when the peak began.

Based on the sediment record, the researchers propose a different cause for the peak: a chain of events that created ideal conditions for sea life to briefly flourish. The changing climate triggered deep mixin
'/>"/>

Contact: Media Relations Office
media@whoi.edu
508-289-3340
Woods Hole Oceanographic Institution
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Scientists decipher cellular roadmap of disease-related proteins
2. Scientists discover ethnic differences in immune response to TB bacterium
3. Scientists identify promising antiviral compounds
4. Harvard and USC scientists show how DHA resolves inflammation
5. Tiny nanocubes help scientists tell left from right
6. Scientists discover thriving colonies of microbes in ocean plastisphere
7. Scientists discover new details about rice blast, a deadly plant fungus
8. Research reveals low exposure of excellent work by female scientists
9. Scientists use DNA from a museum specimen to study rarely observed type of killer whale
10. Hundreds of insect scientists migrating to Rapid City this week
11. Scientists identify potential drug target for treatment-resistant anemias
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... BostonThe American Society for Bone and Mineral Research awarded ... of Medicine (BUSM), with the 2014 Louis V. Avioli ... at BUSM, is internationally known for revolutionizing the understanding ... , The award honors a member of the ... fundamental contributions to bone and mineral basic research. It ...
(Date:7/11/2014)... of researchers from The Chinese University of Hong Kong, ... wild soybean linked to salt tolerance, with implication for ... This study published online in Nature Communications ... for crop improvement. , Soybean is an important crop ... cultivated soybeans have less genetic diversities than their wild ...
(Date:7/11/2014)... 11, 2014 Researchers have pioneered a revolutionary ... new technology, called Virtual Finger, allows scientists to ... neurons and synapses using the flat surface of ... 3D imaging studies orders of magnitude more efficient, ... level across many areas of experimental biology. The ...
Breaking Biology News(10 mins):BUSM's Michael F. Holick receives American Society for Bone and Mineral Research award 2BGI reports a novel gene for salt tolerance found in wild soybean 2Virtual finger enables scientists to navigate and analyze complex 3D images 2
... Research published today reveals the previously unidentified role that fish ... and specifically of the carbonate sediments that contain critical records ... geological past. The discovery, made by a team of ... of a key component of marine sediments the fine-grained ...
... join the American Society for Nutrition (ASN) this weekend, ... Controversies in Clinical Nutrition Conference. As the leading authority ... sides of controversial nutrition topics in dietary supplements, obesity, ... science writers and bloggers, are invited to attend for ...
... who want to eat healthy and live sustainably ... on the environment: a Web-based tool [ http://n-print.org/sites/n-print.org/files/footprint_sql/index.html#/home ... device was created by University of Virginia environmental ... research assistant at U.Va.; and colleagues from the ...
Cached Biology News:Fish provide missing piece in the marine sediment jigsaw 2Fish provide missing piece in the marine sediment jigsaw 3New free, hands-on tool supports sustainable living choices 2New free, hands-on tool supports sustainable living choices 3
(Date:7/10/2014)... July 10, 2014 Deep Knowledge ... Medicine Forum on ‘Commercialising Longevity Research’ and welcomed ... to the London Bioscience Innovation Center for the ... and Aging Analytics Ltd. The meeting highlighted the ... translational research for age-related disease, as well as ...
(Date:7/10/2014)... Terascala, the industry leader in HPC ... former vice president of product management for Flexera Software, ... marketing. Terascala’s software when combined with leading compute and ... performance and most reliable solutions for processing big data. ... expansion and broaden its product portfolio. His leadership in ...
(Date:7/10/2014)... July 10, 2014 Robert Harman, DVM, Founder ... company, is proud to announce the relaunch of his highly ... a new series called “ What are Stem Cells ?” ... honest and straightforward foundation in the basics of stem cell ... on the right type of treatment when considering regenerative medicine. ...
(Date:7/10/2014)... 10, 2014 EvoDerma ’s NOOME Anti-Aging ... rejuvenating device now comes with a second treatment cup to ... , The new cup is thinner on the edges for ... target rough, thin and uneven surfaces on the face, neck ... a stimulating treatment on areas such as the cheeks and ...
Breaking Biology Technology:DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 2DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 3DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 4DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 5DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 6Terascala Expands Executive Team 2Terascala Expands Executive Team 3Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 2Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 3Introducing a New Bonus Treatment Cup for EvoDerma’s NOOME Anti-Aging Motion 2
... the weeks since DEMO 2007, I've had the chance to ... site, Jaman.com . Launched at the conference, Jaman.com offers ... or buy at prices that average about $6 per film. ... core of the Jaman.com experience is the downloadable player, a ...
... Wis. - Looking to raise more venture capital for ... 30 firms presenting at the annual InvestMidwest venture capital ... which also presented at the 2006 forum, would like to ... Phase I clinical trials that are set to begin in ...
... a recent column for the Wisconsin Technology Network , Gov. ... Wisconsin System fueling our state's economy. The governor missed the mark. ... the best in the country. In order to remain on top, however, ... done little of since it was created in 1971. The UW System ...
Cached Biology Technology:We're "Jaman": Purpose-driven browsers drive next wave of Web applications 2We're "Jaman": Purpose-driven browsers drive next wave of Web applications 3ZyStor seeks to raise $15M for clinical trials 2ZyStor seeks to raise $15M for clinical trials 3UW System must remove barriers to innovation 2UW System must remove barriers to innovation 3UW System must remove barriers to innovation 4
Human peripheral blood basophils, For immunohistochemistry (IHC) Cell Chip with Human Peripheral Blood Granulocytes...
Human peripheral blood CD8+ T cells, For immunohistochemistry (IHC) Cell Chip with Human Peripheral Blood PBMC and T Cells...
... been developed specifically for the stabilization ... microwell plates/strips. Coating Stabilizer maintains ... antibody or protein antigen portion of ... is filtered at 0.2 microns., ,Contents: ...
Human endothelial progenitor cells, For immunohistochemistry (IHC) Cell Chip with Human Peripheral Blood Dendritic Cells and EPCs...
Biology Products: