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ENSO impacts on pelagic ecosystems in the Eastern Pacific, with emphasis on fishery resources Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_projects/9z903432s

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  • Many new research and monitoring projects, developed or initiated during ENSO 1982-83, constituted detailed descriptions of changes in specific taxa or specific processes. However, only a few projects were opportunely started or continued as regional efforts in the eastern Pacific. For those reasons, the information obtained is difficult to compare. The works of Alvial (1985), Arntz (1986), Barber and Chavez (1985), Zuzunaga and Niquen (1985), Fiedler et al. (1986), and Pearcy and Schoener (in press) are attempts to integrate hypotheses on timing and cause-effect relations in the ecosystem from a more holistic point of view. This review paper is a new effort to gather, integrate and describe the principal documented impacts of ENSO on the pelagic upwelling ecosystem in the eastern Pacific boundary, principally in the Humboldt and California Current Systems. Most of the information comes from the 1982-83 event and complementary information from other previous events is also mentioned. Objectives of this paper are to show the .biological impacts in relation with the principal environmental changes introduced by ENSO, and to discuss the probable mechanisms that govern their occurrences and interactions. Finally, the effects and consequences of ENSO on the management of pelagic resources will be discussed.
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