Skip to main content

Free Content Oscillations of macrobenthos in shallow waters of the Peruvian central coast induced by El Niño 1982-83

Download Article:
(PDF 920.318359375 kb)
Macrozoobenthos was sampled at 15 m (January 1982–October 1984) and 34 m depth (September 1981–September 1984) in the Bay of Ancón, north of Lima. Fluctuations in density, biomass, species composition and diversity of the fauna as well as oscillations in the density of several dominant species were studied in relation to temperature, salinity and dissolved oxygen. El Niño (EN) 1982–83 induced marked positive effects at both depths. Some of these changes prevailed in 1984 due to the increase of oxygen close to the seafloor and the persistence of higher O2 values during and after the phenomenon.

The number of species at 15 m, which before EN fluctuated between 3 and 17, increased to >26 (max. 45) during EN and in the months following the event. Biomass, before EN always <1 g, reached 18.4 g AFDW per m2 in December 1982. Density, normally <4000 per m2, increased to 1724, and diversity nearly doubled and remained high until September 1984.

The number of species at 34 m (≥5 before EN) fluctuated between 15 and 24 from December 1982 to February 1983 and returned to ≥5 by June 1984. Biomass reached 6.9 g AFDW per m2 in December 1982. Density, normally <425 per m2, increased to 13550, and diversity at this depth nearly tripled in February 1983.

27 References.

No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 1988-08-01

More about this publication?
  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more