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THE EFFECTS OF EL NINO AND LA NINA ON SEABIRD ASSEMBLAGES IN THE EQUATORIAL PACIFIC MONITORING
Citation:
Ribic, C., D. Ainley, AND L. Spearr. THE EFFECTS OF EL NINO AND LA NINA ON SEABIRD ASSEMBLAGES IN THE EQUATORIAL PACIFIC MONITORING. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/290 (NTIS PB92217405).
Description:
Spring and autumn cruises in Equatorial and Subtropical Surface waters were conducted 1984-1989 in the eastern equatorial Pacific. our genera predominated, both the relative contribution of each to species assemblages differed markedly depending on season and water mass. uring 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. uring spring, in either water mass, no one genus could be considered dominant. ssemblage composition varied from year to year, but changed the most during El Nino 1986-87 and La Nina 1988. he impact of either event was manifested by a decrease or disappearance of genera and species that were normally of medium-abundance. enerally, the common genera and species were not affected. or El Nino, assemblages changed more during autumn compared to spring. he effect of La Nina was strongest during spring.
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THE EFFECTS OF EL NINO AND LA NINA ON SEABIRD ASSEMBLAGES IN THE EQUATORIAL PACIFIC MONITORING