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:
TAG: For sardine and anchovy Nio events not always have the same effects

(Date:2/25/2015)... Feb. 25, 2015  ABC Financial Services (ABC), ... the Health and Fitness Industry, today announced enhancements ... MYiCLUBonline.  The latest upgrade includes advances to the ... cardless check-in via Identity One fingerprint biometrics. The ... through interactive displays at the International Health, Racquet ...
(Date:2/24/2015)... 2015 This report analyzes the worldwide markets for ... analytics for the US, Canada , ... Asia-Pacific , Middle East , ... forecasts are provided for the period 2013 through 2020. Also, ... data and analytics are derived from primary and secondary research. ...
(Date:2/24/2015)... YORK , Feb. 24, 2015 This report analyzes ... by the following Segments: Face Biometrics, and Voice Biometrics. The report ... , Japan , Europe , ... & Africa , and Latin America ... 2013 through 2020. Also, a seven-year historic analysis is provided for ...
Breaking Biology News(10 mins):ABC Financial Unveils New Software Enhancements 2ABC Financial Unveils New Software Enhancements 3World Iris Biometrics Industry 2World Iris Biometrics Industry 3World Iris Biometrics Industry 4World Iris Biometrics Industry 5World Iris Biometrics Industry 6World Iris Biometrics Industry 7World Iris Biometrics Industry 8World Iris Biometrics Industry 9World Iris Biometrics Industry 10World Iris Biometrics Industry 11World Face and Voice Biometrics Industry 2World Face and Voice Biometrics Industry 3World Face and Voice Biometrics Industry 4World Face and Voice Biometrics Industry 5World Face and Voice Biometrics Industry 6World Face and Voice Biometrics Industry 7World Face and Voice Biometrics Industry 8World Face and Voice Biometrics Industry 9World Face and Voice Biometrics Industry 10World Face and Voice Biometrics Industry 11World Face and Voice Biometrics Industry 12World Face and Voice Biometrics Industry 13World Face and Voice Biometrics Industry 14World Face and Voice Biometrics Industry 15World Face and Voice Biometrics Industry 16
(Date:2/28/2015)... 28, 2015 Increasing its efforts to resolve ... its first three episodes of The GMO TRUTH podcast on ... month, as it continues its mission to discover the truth ... first phase, to “uncover the truth about the GMOs in ... The GMO Truth Podcast is an expansion of the documentary/investigative ...
(Date:2/27/2015)... 2015 Immunovaccine Inc. (“Immunovaccine” or the ... fraudulent press release disseminated this morning by PR Web, ... This press release states that Immunovaccine has entered into ... press release did not originate from Immunovaccine and there ... press release. Please note that all official statements ...
(Date:2/27/2015)... SUMMERLAND, British Columbia , Feb. 27, 2015 ... ), a leader in synthetic biology, today announced it ... Fruits (OSF), the pioneering agricultural company behind the ... non-browning apple. Through the acquisition, Intrexon expands its food ... appetizing and convenient for consumers while providing economic benefit ...
(Date:2/27/2015)... Calif. , Feb. 27, 2015  Pharmacyclics, ... that longer-term toxicology studies for its newly developed ... or RA, have been completed. The results of ... U.S. Food and Drug Administration. The feedback received ... of the ongoing first-in-human study. Additional preclinical work ...
Breaking Biology Technology:The Walk a Mile Project Launches “GMO Truth” Podcast 2Immunovaccine Disclaims Hoax Press Release 2Intrexon to Acquire Okanagan Specialty Fruits 2Intrexon to Acquire Okanagan Specialty Fruits 3Intrexon to Acquire Okanagan Specialty Fruits 4Pharmacyclics Provides Clinical Update on BTK Inhibitor for Autoimmune Diseases 2Pharmacyclics Provides Clinical Update on BTK Inhibitor for Autoimmune Diseases 3
Cached News: