Navigation Links
Oceans more vulnerable to agricultural runoff than previously thought, study finds

dump tons of excess nitrogen into rivers that eventually flow into the sea.

"There has been an international effort to try to understand the productivity of the oceans and their potential vulnerability to nitrogen," said Pamela A. Matson, the dean of the School of Earth Sciences and co-author of the Nature study. "A map has been developed showing special regions in the world where nitrogen is low relative to other nutrients that phytoplankton need to grow, and the Gulf of California is one of those regions. Our study is the first to show that the addition of human-caused nutrients in these special areas causes extra blooms of phytoplankton."

Yaqui Valley agriculture

To assess the impact of agricultural runoff on the gulf, the Stanford scientists turned their attention to one of Mexico's most productive coastal farming regions-the Yaqui River Valley, which drains into the gulf.

"The Yaqui Valley agricultural area is 556,000 acres [225,000 hectares] of irrigated wheat," Matson said. "The entire valley is irrigated and fertilized in very short windows of time during a six-month cycle. The excess water from irrigation runs off through streams and channels into the estuaries and then out to sea."

Matson and her colleagues wondered if each fertilization and irrigation event would trigger a noticeable phytoplankton bloom near the mouth of the Yaqui River, which is located on the mainland side of the gulf. To find out, the researchers analyzed a series of images from an orbiting NASA satellite called SeaWiFS, which is equipped with special light-sensitive instruments that can detect phytoplankton floating near the surface of the sea.

"These instruments measure the level of greenness in the water," explained Kevin Arrigo, associate professor of geophysics. "The greener the water, the more phytoplankton there are."

Dramatic results

Stanford doctoral candidate J. Michael Beman carefully analyzed dozens of SeaWiFS
'"/>

Source:


Page: 1 2 3 4

Related biology news :

1. Oceans turning to acid from rise in CO2
2. Oceans are 70 percent shark free
3. MIT: Oceans are a major gene swap-meet for plankton
4. Rats infected as newborns grew up vulnerable to memory problems during an immune challenge
5. Newly identified mechanism helps explain why people of African descent are more vulnerable to TB
6. Report lists top 20 most-vulnerable African carnivores
7. Coral reefs are increasingly vulnerable to angry oceans
8. Producing bio-ethanol from agricultural waste a step closer
9. Mine runoff continues to provide clues to microbial diversification
10. Different microarray systems more alike than previously thought
11. Atmosphere may cleanse itself better than previously thought
Post Your Comments:
(Date:8/20/2014)... of approximately 3 million infants, a team of scientists ... of Massachusetts Medical School, have shown that newborn screening ... across public health newborn screening programs. Data from 11 ... of the Journal of the American Medical Association ... in newborns is higher than previously thought and believed ...
(Date:8/20/2014)... discovered that acral melanomas the rare type of skin ... genetically distinct from other more common types of skin cancer, ... journal Pigment Cell & Melanoma Research . , Acral ... of the feet, nail-beds and other hairless parts of the ... caused by UV damage from the sun. , The team, ...
(Date:8/20/2014)... spiciness that is irresistible to some, but intolerable to ... their findings to develop a new drug candidate for ... inflammation or other problems. They reported their progress on ... in ACS, Journal of Medicinal Chemistry . , ... had pegged a compound called capsaicin as the active ...
Breaking Biology News(10 mins):Newborn screening expansion offers early diagnosis and treatment to infants with SCID 2Newborn screening expansion offers early diagnosis and treatment to infants with SCID 3Scientists learn more about rare skin cancer that killed Bob Marley 2
... BOSTON A potential new way to fight obesity-related ... by investigators at the Case Western Reserve University School ... University, the Cleveland Clinic Foundation and Cornell University, discovered ... liver disease brought on by obesity. "The implications of ...
... Geosphere papers posted online 4 and ... Mapping), EarthScope, CHIRP (compressed high-intensity radar pulse), and IODP ... of the nature of Earth. New locations studied: Sakhalin, ... monument, Mxico; and Andalshatten batholith, central Norway. Geosphere ...
... the world over and could be in mortal danger because ... others not, even when exposed to the same environmental conditions? ... Field Museum of Natural History has a surprising answer: The ... coral bleaching due to the light-scattering properties of their skeletons. ...
Cached Biology News:Vitamin E identified as potential weapon against obesity 2Vitamin E identified as potential weapon against obesity 3Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 2Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 3Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 4Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 5Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 6Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 7Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 8Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 9Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP 10Insights into deadly coral bleaching could help preserve reefs 2Insights into deadly coral bleaching could help preserve reefs 3
(Date:8/20/2014)... succeeded in measuring vibrational motion of a single molecule ... vibration of a single molecule differs from the behaviour ... performed at the University of California, Irvine, where post-doctoral ... as a visiting fellow under professor Vartkess A. Apkarian, ... was lead by Professor Eric O. Potma. The results ...
(Date:8/20/2014)... BOSTON , Aug. 20, 2014  PAREXEL International ... it will be presenting at the Baird Healthcare Conference ... President and Chief Financial Officer, will be making a ... p.m. EDT on Wednesday, Sept. 3, 2014. ... through the "Investors" section of PAREXEL,s website at ...
(Date:8/20/2014)... improve the health of your heart, researchers have discovered. ... a standard TENS machine like those designed to relieve ... the small raised flap at the front of the ... The stimulation changed the influence of the nervous system ... can drive failing hearts too hard. , Professor Jim ...
(Date:8/19/2014)... 19, 2014 Shimadzu Scientific Instruments ... Prominence-i and Nexera-i, adding to the company’s extensive ... functionality, an intuitive operating environment, and full automation, ... efficient workflow for conventional to ultra-high-speed analysis. ... and intelligent design so users can begin building ...
Breaking Biology Technology:Seeing a molecule breathe 2PAREXEL International To Present At Baird Healthcare Conference 2'Tickling' your ear could be good for your heart 2Shimadzu’s New i-Series Integrated Liquid Chromatography Systems Provide Laboratories Wider Range of Analytical Capabilities 2Shimadzu’s New i-Series Integrated Liquid Chromatography Systems Provide Laboratories Wider Range of Analytical Capabilities 3
... SAN FRANCISCO, Calif., Dec. 5, 2011 diaDexus, Inc. ... company focused on the development and commercialization of patent-protected ... in cardiovascular disease, today said that it plans to ... & Metabolic Disorders Conference on Tuesday, December 6, 2010 ...
... Md., Dec. 2, 2011 Northwest Biotherapeutics (OTC.BB: NWBO) ... major clean-up of its balance sheet, removing $31.5 million ... (Logo: http://photos.prnewswire.com/prnh/20110329/SF73084LOGO ) ... at the end of the third quarter to $16.5 ...
... Group, Inc. (OTCBB: MDXG), an integrated developer, manufacturer ... bioimplants processed from human amniotic membrane, announced today ... Canaccord Genuity Cardiovascular, Aesthetics and Metabolic Disorders Conference ... Chairman and CEO, William C. Taylor, President and ...
Cached Biology Technology:Northwest Bio Implements Major Balance Sheet Clean-Up 2Northwest Bio Implements Major Balance Sheet Clean-Up 3Northwest Bio Implements Major Balance Sheet Clean-Up 4Northwest Bio Implements Major Balance Sheet Clean-Up 5
... X-Gal ,MOLECULAR BIOLOGY GRADE ,5-Bromo-4-chloro-3-indoxyl-beta-D-galactopyranoside C ... Cl N O 6 ,M.W.= ... ,Solution: Clear (2% in DMF) ,Biological ... and M13 ,Elemental Analysis: Agrees with ...
...
... MW: 34.2kDa Formulation: 10mM HEPES, pH ... dithiothreitiol with 50% glycerol Properites: For ... Certificate of Analysis for individual lots ... followed by gel filtration and Mono-S ...
Antibody Purification Specificity: Antibody Purification ...
Biology Products: