HOME >> BIOLOGY >> NEWS
For sardine and anchovy, El Nio events do not always have the same effects

The warm El Nio episodes are generally accepted to be harmful to the development of cold-water anchovy populations, but favourable for abundant populations of sardine, adapted to warmer waters. IRD researchers and their Peruvian partners (1) have been studying fluctuations in pelagic fish populations in the world's richest oceanic ecosystems for fish, the Peru-Humboldt Current system, off Peru. They showed that the traditional explanation does not always hold true. During the 1997-98 El Nio event, one of the strongest of the XXth century, anchovy in fact adapted and reproduced by taking advantage of refuge habitat 'loopholes' located very close to the coast. The existence of these areas, with specifically different climatic conditions, appear to have favoured the survival of these populations in spite of generally unfavourable climatic conditions.

Near the coasts of Peru and Chile, the Humboldt Current ecosystem is the world's most productive fishing zone. This cold-current zone, with frequent coastal upwellings ( 2 ), occupies less than 1 % of the world's ocean surface and provides 15 to 20 % of global maritime catches. Unlike other large regions of upwelling, this ecosystem proves to be more exposed to variations in climate. Its geographical location brings it under the direct influence of disturbances generated by the El Nio-La Nia events which arise every 3 to 7 years. Other climatic cycles, called El Viejo-La Vieja by reference to the first two, also bear influence, but on a longer time-scale with a period of about 50 years. Large-scale alternation of abundance of sardine and anchovy populations corresponds to these warm (El Viejo) and cold (La Vieja) climatic regimes. At smaller scale, the El Nio events would induce massive die-offs in anchovy, adapted to cold, nutrient-rich coastal waters, whereas the populations of sardine (and of other species like jack mackerel or mackerel), which live in the warmer waters, would experience an upsurge
'"/>

Contact: Hlne Deval
presse@paris.ird.fr
33-148-037-519
Institut de Recherche Pour le Dveloppement
5-Apr-2005


Page: 1 2 3

Related biology news :

1. Critical protein prevents DNA damage from persisting through generations
2. Repair of DNA by Brca2 gene prevents medulloblastoma
3. Media events planned for 2007 American Society of Gene Therapy meeting, May 30-June 3
4. Vaccine prevents prion disease in mice
5. New compound prevents alcoholic behavior, relapse in animals by blocking stress response
6. Free public events at the 2007 AAAS Annual Meeting
7. Cold Spring Harbor Laboratory scientists discover new gene that prevents multiple types of cancer
8. Blood test predicts cardiac events and death in heart patients
9. Antibody therapy prevents type 1 diabetes in mice
10. Cambridge led team discovers gene mutation which prevents carriers from feeling pain
11. The abortion pill compound prevents breast tumor growth

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


(Date:2/3/2016)... 2016 Vigilant Solutions announces today that the ... Missouri solved two recent hit-and-run cases ... from Vigilant Solutions. Brian Wenberg explains, ... victim was walking out of a convenience store and witnessed an elderly male ... vehicle, striking his vehicle and leaving the scene.  In ...
(Date:2/2/2016)... NEW YORK , Feb. 2, 2016 Technology ... service presents an analysis of the digital and computed ... Malaysia , and Indonesia ... current trends and market size, as well as regional ... by country and discusses market penetration and market attractiveness, ...
(Date:2/1/2016)... Fla. , Feb. 1, 2016  Wocket® smart wallet ( www.wocketwallet.com ... and television personality, Joey Fatone . Las Vegas ... greet fans. --> Las Vegas , where ... --> The new video ad was filmed at the Consumer ... appeared at the Wocket booth to meet and greet fans. ...
Breaking Biology News(10 mins):
(Date:2/10/2016)... ... February 10, 2016 , ... ... Society of Pharmaceutical Engineering (ISPE) Rocky Mountain Chapter 21st Annual Vendor Exhibition on ... fill more than 100 tables for its annual event, which will run from ...
(Date:2/10/2016)... (PRWEB) , ... February 10, 2016 , ... ... expansion to their comprehensive training and support program, Sonalink™ remote monitoring. The inaugural ... procedures performed on Friday, February 5th, connecting Dr. Samuel Peretsman to a HIFU ...
(Date:2/10/2016)... ... February 10, 2016 , ... Curoverse announced today ... Azure, Arvados provides capabilities for managing and processing genomic and health data at ... major institutions collecting and analyzing genomic data,” said Adam Berrey chief executive officer ...
(Date:2/10/2016)... , ... February 10, 2016 , ... Cenna Bioscience Inc., ... the treatment of Alzheimer’s disease, announced today it has been selected to present at ... the Breakers in Palm Beach, Florida. The purpose of the Forum is to ...
Breaking Biology Technology:
Cached News: