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:1/12/2017)...  Trovagene, Inc. (NASDAQ: TROV ), a ... that it has signed agreements with seven strategic partners ... Middle East for commercialization of the ... wave of international distribution agreements for Trovagene,s CLIA based ... The initial partners will introduce Trovagene,s liquid biopsy ...
(Date:1/11/2017)... 2017 Intoxalock, a leading ignition interlock provider, ... its patent-pending calibration device. With this new technology, Intoxalock ... upload data logs and process repairs at service center ... "Fighting drunk driving through the application of cutting-edge technologies ... but also for the customer who can get back ...
(Date:1/6/2017)... Colo. , Jan. 5, 2017  SomaLogic ... the "Digital Life Alliance" established by iCarbonX, the ... 2015 to build a "Global Digital Health Ecosystem ... on a combination of individual,s biological, behavioral and ... the agreement between the companies, SomaLogic will provide ...
Breaking Biology News(10 mins):
(Date:1/20/2017)... 20, 2017 Stock-Callers.com explores the ... influenced the most recent performances of select equities. In ... RGLS ), Abeona Therapeutics Inc. (NASDAQ: ... ), and Sage Therapeutics Inc. (NASDAQ: SAGE ... View Research, global Biotech market size is expected to reach $604.40 billion by ...
(Date:1/20/2017)... NEW YORK , January 20, 2017 ... Health Organization, cancer is one of leading causes of ... in 2012. Although the number of cancer related deaths ... since 1990. Rising in incidence rate of various cancers ... According to a research report by Global Market Insights, ...
(Date:1/19/2017)... Research and Markets has announced the addition ... Type, Application - Global Opportunity Analysis and Industry Forecast, 2014-2022" ... ... is projected to reach $15,737 million by 2022 from $6,521 in ... Omic technologies segment accounted for more than half ...
(Date:1/19/2017)... and HOUSTON , Jan. 19, ... today announced the formation of its Medical/Clinical Advisory ... and industry veterans who enhance the range and ... accelerates development of its novel prenatal diagnostic tests.  ... clinical and strategic guidance for the company,s product ...
Breaking Biology Technology: