Navigation Links
Bad news for coastal ocean: less fish out, means more nitrogen in
Date:1/28/2008

Montreal, January 29, 2008 A Canada-U.S. research team has found that commercial fisheries play an unexpected role in the decline of water quality in coastal waters. In the latest issue of Nature Geoscience, Roxane Maranger and Nina Caraco explain that the collapse of the fisheries from decades of over fishing has played a significant role in disturbing the balance between nitrogen entering and leaving costal water systems.

The study, the first to examine the worlds 58 coatal regions, shows how failing to maintain ecosystems in a sustainable manner has wide-ranging consequences. Using data provided by the United Nations, Maranger and Caraco found that commercial fishing has played an important, yet declining, role in removing man-made nitrogen from coastal waters.

Fish accumulate nitrogen as biomass, and when humans move fish from the ocean to the table through commercial fisheries, they are returning part of this terrestrial nitrogen generated by humans back to the land, said Maranger, a biology professor at the Universit de Montral (Canada).

Caraco, an aquatic biogeochemist at the Cary Institue of Ecosystem Studies (Millbrook, New York, U.S.) notes: While nitrogen is essential to plant and animal life in oceans, human export of nitrogen from land to ocean has resulted in exploding nitrogen levels in coastal waters over the past century. Nitrogen-rich fertilizer thats applied to farmland eventually makes its way into coastal waters via a network of streams and rivers. Fertilizer run-off is a significant source of nitrogen pollution to many coastal regions around the world.

Four decades ago, commercial fishing removed the equivalent of 60 percent of the nitrogen from coastal oceans that entered as fertilizers. Today, this figure has dropped to 20 percent. From a historical perspective, this is bad news, says Maranger. Increased nitrogen levels in coastal ocean ecosystems throughout the world have resulted in excessive plant growth, lack of oxygen, severe reductions in water quality and in fish and other animal populations.

In order to manage coastal ecosystems in a sustainable manner, while fully understanding the impact that humans are having on the nitrogen cycle, the scientists recommend the role of commercial fisheries be reexamined.


'/>"/>

Contact: S-J Desjardins
sylvain-jacques.desjardins@umontreal.ca
514-343-7593
University of Montreal
Source:Eurekalert

Related biology news :

1. Low oxygen in coastal waters impairs fish reproduction
2. Acid rain has a disproportionate impact on coastal waters
3. Springer will publish Journal of Coastal Conservation
4. Abel to receive posthumous Ocean and Coastal Leadership award
5. Resilience concepts poised to aid management of coastal marine ecosystems
6. Generalist bacteria discovered in coastal waters may be more flexible than known before
7. Less Arctic ice means higher risks, experts warn
8. Nitrogen -- the silent species eliminator
9. Study reveals that nitrogen fertilizers deplete soil organic carbon
10. When accounting for the global nitrogen budget, dont forget fish
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/28/2016)... and BANGALORE, India , April ... EdgeVerve Systems, a product subsidiary of Infosys (NYSE: ... today announced a global partnership that will provide ... to use mobile banking and payment services.      ... a key innovation area for financial services, but it also ...
(Date:4/26/2016)... and LONDON , ... Finacle, part of EdgeVerve Systems, a product subsidiary ... Onegini today announced a partnership to integrate the ...      (Logo: http://photos.prnewswire.com/prnh/20151104/283829LOGO ) ... provide their customers enhanced security to access and ...
(Date:4/19/2016)... DUBAI , UAE, April 20, 2016 ... can be implemented as a compact web-based "all-in-one" system ... in the biometric fingerprint reader or the door interface ... requirements of modern access control systems. The minimal dimensions ... the ID readers into the building installations offer considerable ...
Breaking Biology News(10 mins):
(Date:5/4/2016)... New York, NY (PRWEB) , ... May 04, 2016 , ... ... neurofibromatosis (NF), a genetic disorder that causes tumors to grow on nerves throughout the ... treatment or cure. , Through numerous community events held during the month of May, ...
(Date:5/3/2016)... India , May 3, 2016 /PRNewswire/ ... (DNA Chip (Genomics, Drug Discovery, Gene Expression) ... End user (Academics Institutes, Diagnostics Centers), Fabrication ... published by MarketsandMarkets, the market is expected ... from USD 7.63 Billion in 2015, growing ...
(Date:5/3/2016)... (PRWEB) , ... May 03, 2016 , ... ... announced the addition of Dr. Nancy Gillett to its Board of Directors. Dr. ... she served as Corporate Executive Vice President and Chief Scientific Officer. A board-certified ...
(Date:5/3/2016)... May 3, 2016  Dr. Thomas P. McHugh ... The Woodlands, Texas , now offers ... of treated fat cells in just 25-minutes, leaving a ... 90 percent of Americans report feeling bothered by excess ... reduction procedures are a growing industry. This innovative new ...
Breaking Biology Technology: