HOME >> BIOLOGY >> NEWS
Mediterranean fishery recovers, thanks to manmade pollutants

After the closure of the Aswan high dam in 1965, the flow of nutrients from the Nile into Mediterranean coastal waters was reduced by more than 90 percent, and the once productive fishery collapsed. In the 1980s the fishery began a dramatic recovery, coincident with increasing fertilizer use, expanded agricultural drainage, increasing human population, and dramatic extensions of urban water supplies and sewage collection systems.

In a recent issue of Ambio, a Swedish scientific journal on the human environment, URI Graduate School of Oceanography biologist Scott Nixon discusses how human sewage and agricultural drainage now support the fertility once provided by the Nile, although the nature of the productive ecosystem now supporting the fishery appears to be quite different from the historical one.

Recent satellite images document the continuing fertility of the Nile valley and delta where continuous irrigation and intensive applications of fertilizer have replaced the traditional flood-based agriculture. Fish landings now greatly exceed those prior to the closure of the high dam, and the landings of prawn have reached 75% of their pre-dam value.

"The fish eaten today in Alexandria and Cairo may taste as good," said Nixon, " but I believe that they have been fed by sources far different from the rain and soils of Ethiopia that served as sources of the nutrients in the historic annual flood."

Nixon discusses three reasons for believing that the amount of phosphorus and nitrogen reaching the Egyptian Mediterranean coast in urban waste water increased dramatically during the 1980s, coincident with the recovery of the coastal fisheries. First, the population had increased substantially since 1965; second, the nutrition of the population had improved in terms of total per capita consumption; and third, there was a remarkable expansion of the public water and sewer systems of Greater Cairo, Alexandria, and other urban areas during the 1980s.


'"/>

Contact: Lisa Cugini
lcugini@gso.uri.edu
401-874-6642
University of Rhode Island
1-Jul-2003


Page: 1 2 3

Related biology news :

1. The Mediterranean connection: ecological effects of El Nio in the Northern hemisphere
2. Mediterranean hot flush detected after scorching summer
3. A major scientific survey finds more species than in the entire Mediterranean at Lifou, Loyalty Islands
4. ¡Ciao! down: Mediterranean diet after a heart attack adds years to life
5. Destructive Algae Overtaking Mediterranean Waters
6. Will Global Change Increase Fire Activity In The Mediterranean Basin?
7. New paper in Science introduces revolutionary new paradigm for fishery management
8. Walleye fishery threatened; Puerto Rico aquaculture, calling ALVIN on ocean bottom
9. URI biological oceanographer examines the relationship between the inshore and offshore New England squid fishery
10. Giant jellies invade Gulf of Mexico threatening shrimp fishery
11. When male fish hum, females swim in, thanks to hormones, adaptable hearing

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/5/2017)... KEY FINDINGS The global market for stem ... 25.76% during the forecast period of 2017-2025. The rise ... growth of the stem cell market. Download ... The global stem cell market is segmented on the ... cell market of the product is segmented into adult ...
(Date:3/30/2017)... , March 30, 2017 The research team ... for three-dimensional (3D) fingerprint identification by adopting ground breaking 3D fingerprint ... new realm of speed and accuracy for use in identification, crime ... affordable cost. ... A ...
(Date:3/27/2017)... March 27, 2017  Catholic Health Services (CHS) ... Systems Society (HIMSS) Analytics for achieving Stage 6 ... sm . In addition, CHS previously earned a ... using an electronic medical record (EMR). ... level of EMR usage in an outpatient setting.  ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... A ... pregnancy rates in frozen and fresh in vitro fertilization (IVF) transfer ... age to IVF success. , After comparing the results from the fresh and ...
(Date:10/10/2017)... (PRWEB) , ... October 10, 2017 , ... Dr. Bob ... at his local San Diego Rotary Club. The event entitled “Stem ... CA and had 300+ attendees. Dr. Harman, DVM, MPVM was joined by two ...
(Date:10/9/2017)... DIEGO , Oct. 9, 2017  BioTech ... biological mechanism by which its ProCell stem cell ... critical limb ischemia.  The Company, demonstrated that treatment ... amount of limbs saved as compared to standard ... the molecule HGF resulted in reduction of therapeutic ...
(Date:10/7/2017)... , ... October 06, 2017 ... ... experience providing advanced instruments and applications consulting for microscopy and surface analysis, ... in application consulting, Nanoscience Analytical offers a broad range of contract analysis ...
Breaking Biology Technology:
Cached News: