Marine Biology

, Volume 151, Issue 2, pp 401–411 | Cite as

Reef recovery 20 years after the 1982–1983 El Niño massive mortality

Research Article


For over 20 years the El Niño-Southern Oscillation (ENSO) has caused damage to the coral reefs of the eastern Pacific and other regions. In the mid-1980s scientists estimated that coral cover was reduced by 50–100% in several countries across the region. Almost 20 years (2002) after the 1982–1983 event, we assessed the recovery of the virtually destroyed reefs at Cocos Island (Costa Rica), previously evaluated in 1987 and reported to have less than 4% live coral cover. We observed up to fivefold increase in live coral cover which varied among reefs surveyed in 1987 and 2002. Most new recruits and adults belonged to the main reef building species from pre-1982 ENSO, Porites lobata, suggesting that a disturbance as outstanding as El Niño was not sufficient to change the role or composition of the dominant species, contrary to phase shifts reported for the Caribbean. During the 1990s, new species were observed growing on the reefs. Notably, Leptoseris scabra, considered to be rare in the entire Pacific, was commonly found in the area. Recovery may have begun with the sexual and asexual recruits of the few surviving colonies of P. lobata and Pavona spp. and with long distance transport of larvae from remote reefs. We found an overall 23% live coral cover by 2002 and with one reef above 58% indicating that Cocos Island coral reefs are recovering.



We thank Yosy Naaman, Avi Klapfer, and crew members of the SeaHunter and UnderseaHunter vessels for providing all the logistical support. Thanks to E. Ochoa and E. Ruiz for assistance in the field. I. Hernández and K. Kaufman assisted in data management. This research was partially sponsored by SeaHunter/UnderseaHunter, the Smithsonian Tropical Research Institute, and the Universidad de Costa Rica. The comments of three anonymous reviewers greatly improved the manuscript.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Smithsonian Tropical Research InstituteUnit 0948APOUSA
  2. 2.Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) and Escuela de BiologíaUniversidad de Costa RicaSan Pedro, San JoséCosta Rica

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