Record Display for the EPA National Library Catalog


Main Title Effects of El Nino and La Nina on Seabird Assemblages in the Equatorial Pacific.
Author Ribic, C. A. ; Ainley, D. G. ; Spear, L. B. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Point Reyes Bird Observatory, Stinson Beach, CA. ;Washington Univ., Seattle. Center for Quantitative Science in Forestry, Fisheries, and Wildlife.;National Science Foundation, Washington, DC.;National Geographic Society, Washington, DC.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-92/290; NSF-OCE-8515637 ;NSF-OCE-8911125;
Stock Number PB92-217405
Additional Subjects Ocean currents ; Waterfowl ; Equatorial Pacific Ocean ; Biological surveys ; Aquatic ecosystems ; Species diversity ; Climatic changes ; Birds ; Seasons ; Statistical data ; Marine biology ; Abundance ; El Nino ; La Nina
Library Call Number Additional Info Location Last
NTIS  PB92-217405 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
Spring and autumn cruises in Equatorial and Subtropical Surface waters were conducted 1984-1989 in the eastern equatorial Pacific. Three genera predominated, but the relative contribution of each to species assemblages differed markedly depending on season and water mass. During autumn, on the basis of biomass, Pterodroma dominated assemblages in both water masses; on the basis of abundance, Pterodroma shared dominance with Oceanodroma but only in Equatorial Surface Water. During spring, in either water mass, no one genus could be considered dominant. Assemblage composition varied from year to year, but changed the most during El Nino 1986-87 and La Nina 1988. The impact of either event was manifested by a decrease or disappearance of genera and species that were normally of medium-abundance. Generally, the common genera and species were not affected. For El Nino, assemblages changed more during autumn compared to spring. The effect of La Nina was strongest during spring.