The marine ecosystem off Peru: What are the secrets of its fishery productivity and what might its future hold?

Andrew Bakun, Scarla J. Weeks

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

The marine ecosystem located off the coast of central and northern Peru has stood as the "world's champion" producer, by far, of exploitable fish biomass, generally yielding more than 20 times the tonnage of fishery landings produced by other comparable regional large marine ecosystems of the world's oceans that operate under similar dynamic contexts and are characterized by comparable, or even greater, basic primary production. Two potentially contributing aspects are discussed from a framework of interregional comparative pattern recognition: (1) the advantageous low-latitude situation that combines strong upwelling-based nutrient enrichment with low wind-induced turbulence generation and relatively extended mean "residence times" within the favorable upwelling-conditioned near-coastal habitat and (2) the cyclic "re-setting" of the system by ENSO perturbations that may tend to interrupt malignant growth of adverse self-amplifying feedback loops within the nonlinear biological dynamics of the ecosystem. There is a developing scientific consensus that one of the more probable consequences of impending global climate changes will be a general slowing of the equatorial Pacific Walker Circulation and a consequent weakening of the Pacific trade wind system. Since the upwelling-favorable winds off Peru tend to flow directly into the Pacific southeast trade winds, a question arises as to the likely effect on the upwelling-producing winds that power the productivity of the regional coastal ecosystems of the Peru-Humboldt Current zone. It is argued that the effects will in fact be decoupled to the extent that upwelling-favorable winds will actually tend to increase off Peru. Data demonstrative of this decoupling are presented. A tendency for less intense El Niño episodes in the future is also suggested. These conclusions provide a framework for posing certain imponderables as to the future character of the Peruvian marine ecosystem and of the fisheries it supports.

Original languageEnglish
Pages (from-to)290-299
Number of pages10
JournalProgress in Oceanography
Volume79
Issue number2-4
DOIs
StatePublished - Oct 1 2008

Fingerprint

marine ecosystem
Peru
upwelling
fishery
fisheries
trade winds
productivity
trade wind
wind power
ecosystems
Walker circulation
resetting
eutrophication
nutrient enrichment
pattern recognition
primary productivity
oceans
El Nino-Southern Oscillation
climate change
primary production

Keywords

  • Climate change
  • Ecosystem-based management
  • El Niño
  • Environmental conditions
  • Peruvian fisheries
  • Upwelling

ASJC Scopus subject areas

  • Aquatic Science
  • Geology

Cite this

The marine ecosystem off Peru : What are the secrets of its fishery productivity and what might its future hold? / Bakun, Andrew; Weeks, Scarla J.

In: Progress in Oceanography, Vol. 79, No. 2-4, 01.10.2008, p. 290-299.

Research output: Contribution to journalArticle

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