Navigation Links
Deep-sea corals record dramatic long-term shift in Pacific Ocean ecosystem
Date:12/15/2013

en feeding the surface waters of the open ocean. As a result of decreasing nitrogen inputs from subsurface water, the phytoplankton community at the base of the food web became increasingly dominated by nitrogen-fixing cyanobacteria, which are able to use the nitrogen gas absorbed by surface waters from the atmosphere.

"In the marine environment, the two major sources of nitrogen are dissolved nitrate, which is more concentrated in the subsurface and deep water and is brought to the surface by upwelling, and nitrogen fixation by specialized microorganisms that are like the legumes of the sea," explained first author Owen Sherwood, who worked on the study as a postdoctoral researcher at UCSC and is now at the University of Colorado, Boulder.

The shift revealed in the coral record--from an ecosystem supported by nitrate coming up from deeper waters to one supported more by nitrogen-fixing organisms--may be a result of the North Pacific Subtropical Gyre expanding and becoming warmer, with more stable layering of warm surface water over cooler subsurface water. This increased "stratification" limits the amount of nutrients delivered to the surface in nutrient-rich subsurface water.

Scientists have observed warming and expansion of the major mid-ocean subtropical gyres in the past few decades and have attributed this trend to global warming. The new study puts these observations in the context of a longer-term trend. "It seems that the change in nitrogen sources, and therefore possibly large-scale shifts in ocean conditions, switched on at the end of the Little Ice Age and it is still continuing today," McCarthy said.

A key innovation in nitrogen isotope analysis was crucial to this study. Nitrogen-15 is a minor stable isotope of nitrogen, and the ratio of nitrogen-15 to nitrogen-14 is widely used to trace different sources of nitrogen. The nitrogen fixed by cyanobacteria in surface water, for example, has a different isotope ratio fr
'/>"/>

Contact: Tim Stephens
stephens@ucsc.edu
831-459-2495
University of California - Santa Cruz
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Survey of supposed deep-sea chemical munitions dump off Southern California
2. Breaking deep-sea waves reveal mechanism for global ocean mixing
3. Successful deployment of an autonomous deep-sea explorer to search for new forms of microbial life
4. Thermal limit for animal life redefined by first lab study of deep-sea vent worms
5. Antarcticas first whale skeleton found with 9 new deep-sea species
6. Antarcticas first whale skeleton found with nine new deep-sea species
7. KU Leuven lab coordinates €9m effort to find new deep-sea drugs
8. Wood on the seafloor -- an oasis for deep-sea life
9. Deep-sea crabs seek food using ultraviolet vision
10. Delving into the molecular mechanism behind deep-sea bacterias pressure tolerance
11. Copper chains: Study reveals Earths deep-seated hold on copper
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Deep-sea corals record dramatic long-term shift in Pacific Ocean ecosystem
(Date:5/14/2015)... , May 14, 2015  Verificient ... identity verification and online remote proctoring, announced ... software-as-a-service (SaaS) company and creator of the ... of the two companies will benefit from ... Canvas. As a fully integrated ...
(Date:5/11/2015)... DAYTON, Ohio , May 11, 2015  Through a ... Ohio had a strong showing at AUVSI,s ... . These representatives of Ohio,s UAS ... domestic and abroad from all points along the UAS ecosystem. ... Dayton Development Coalition,s (DDC) Vice President for Aerospace Rich ...
(Date:5/10/2015)... Fingerprint Cards (FPC) has received an order for ... World Peace Industrial Group (WPI), part of WPG Holdings. WPI ... . Deliveries are planned to take place during Q3 2015 ... China . The order value of 235 ... 1 000 MSEK for 2015.   Jörgen Lantto, acting ...
Breaking Biology News(10 mins):Verificient and Instructure Announce Alliance Partnership to Provide Online Proctoring for K-12 and Higher Education Institutions 2Ohio Flies High at Unmanned '15, Sets Stage for Ohio UAS Conference 2Fingerprint Cards Receives Touch Fingerprint Sensor Order of SEK 235 Million 2
... have discovered why a bacterial lung infection is so ... medical authorities had thought, according to research published August ... the first time that a toxin released by bacteria ... pneumococcal pneumonia. It is the bleeding, the authors argue, ...
... published by EMBL scientists and their collaborators will make ... large-scale proteomics data. The papers are published in Nature ... the quantity of available biological information and the use ... held in these databases is vital to allow full ...
... end and could have a long term viable future, according ... Previous studies have found that the giant pandas isolation, unusual ... lack of genetic diversity that will inevitably lead the species ... Bruford and Dr Benot Goossens from the School of Biosciences, ...
Cached Biology News:Bleeding, not inflammation, is major cause of early lung infection death 2Bleeding, not inflammation, is major cause of early lung infection death 3Minimum information standards -- all for 1 and 1 for all 2Minimum information standards -- all for 1 and 1 for all 3
(Date:5/29/2015)... London, UK (PRWEB) May 29, 2015 ... Co., Ltd. (Chem-Report ) signed a partnership agreement ... is now authorised to distribute and sell research ... Assistant Manager at Partners Department, commented upon the ... creating reports on key petroleum and chemical markets ...
(Date:5/29/2015)... Research and Markets ( http://www.researchandmarkets.com/research/7bf7ff/cytogenetics ) ... report "Cytogenetics - Technologies, Markets and Companies" ... deals with cytogenetics in a broader sense rather ... chromosome structure and identify abnormalities related to disease. ... also referred to as molecular cytogenetics. The scope ...
(Date:5/28/2015)... May 28, 2015 ... the addition of Jain PharmaBiotech,s new report  ... Companies"  to their offering.       ... a challenge in management. With nearly 8 ... seven major markets of the world and ...
(Date:5/28/2015)... 27, 2015 Research and Markets( http://www.researchandmarkets.com/research/l9dqwt/animal_genetics ) ... Market by Products, by Testing services - Global Forecast ... The global animal genetics market is estimated to be ... a CAGR of 8-9% during the forecast period of ... driven by increasing animal protein consumption, increasing adoption of ...
Breaking Biology Technology:Market Publishers Ltd and Chem-Report Sign Partnership Agreement 2Market Publishers Ltd and Chem-Report Sign Partnership Agreement 3Global Cytogenetics Market Report 2015-2024 - Technologies, Markets and Companies 2Global Cytogenetics Market Report 2015-2024 - Technologies, Markets and Companies 3Global Alzheimer Disease Report 2015-2024 - New Drugs, Markets and Companies 2Global Alzheimer Disease Report 2015-2024 - New Drugs, Markets and Companies 3Global Animal Genetics (Canine, Equine, Poultry, Porcine, Bovine, and Genetic Material) Market 2015 - Global Forecast to 2020 2
... gravity-defying grace and exquisite balance of their feline friends. But ... cats lap milk? Researchers at MIT, Virginia Tech and ... and found that felines of all sizes take advantage of ... will be published in the November 11 online issue of ...
... is essential in today,s telecommunications-based society. Professor Tobias Kippenberg ... Quantum Measurements have discovered a novel way to couple ... device in which a beam of light traveling through ... stronger light beam. The device thus acts like an ...
... , This release is available in ... getting smaller and smaller, with microelectronic components gradually ... silicon, which is at the present stage the ... however a limit, preventing further miniaturization and technological ...
Cached Biology Technology:Cats show perfect balance even in their lapping 2Cats show perfect balance even in their lapping 3Cats show perfect balance even in their lapping 4All-optical transistor 2Step by step toward tomorrow's nanomaterial 2
Buckets for tube holder inserts...
45° Fixed Angle Rotor for use in the IEC Centra CL2, Centra CL3/CL3R, HN-SII, and the Centra-MP4/MP4R....
... 10-2 is a microprocessor controlled, high ... coupled with exceptionally smooth operation make ... applications involving fluorescence microscopy, ratio imaging, ... requiring rapid and accurate aperture positioning. ...
... Fluoroskan Ascent FL is ... and luminometric measurement technologies ... list of advanced features ... Luminoskan Ascent. Fluoroskan Ascent ...
Biology Products: