Alaska Science Center
Effects of the 1982-83 El Nino - Southern Oscillation on Pacific Ocean bird populations
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Product Type: Symposia or Proceedings
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
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.