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Effects of the 1982-83 El Nino - Southern Oscillation on Pacific Ocean bird populations

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Product Type: Symposia or Proceedings

Year: 1989

Authors: Ainley, D. G., H. R. Carter, D. W. Anderson, K. T. Briggs, M. C. Coulter, F. Cruz, J. B. Cruz, C. A. Valle, S. I. Fefer, S. A. Hatch, E. A. Schreiber, R. W. Schreiber, and N. G. Smith


Suggested Citation:
Ainley, D. G., H. R. Carter, D. W. Anderson, K. T. Briggs, M. C. Coulter, F. Cruz, J. B. Cruz, C. A. Valle, S. I. Fefer, S. A. Hatch, E. A. Schreiber, R. W. Schreiber, and N. G. Smith. 1989. Effects of the 1982-83 El Nino - Southern Oscillation on Pacific Ocean bird populations. Pages 1747-1758 in Proceedings: 19th International Ornithological Congress

Abstract


Seabird reproductive success, population size, and movements in the Pacific region responded dramatically to the 1982-83 El Nino - Southern Oscillation (ENSO). At sites within the North and South Pacific gyres, the onset of seabird responses tracked oceanographic changes related to ENSO; to the north of the gyres, responses were delayed 1 year. Reproductive failures and high adult mortality were detected at all sites investigated. Post-ENSO, the return to "normal" nesting patterns depended on species and locality. The 1982-83 ENSO revealed a dimension to the variability in seabird reproductive biology only now appreciated by ornithologists.

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