Benthic production and processes off Baja California, Northwest Africa and Peru: a classification of benthic subsystems in upwelling ecosystems

dc.contributor.authorRowe, Gilbert T.
dc.date.accessioned2012-05-15T15:31:06Z
dc.date.available2012-05-15T15:31:06Z
dc.date.issued1985
dc.description.abstractEstimates of the standing stocks, secondary production and metabolism of the benthos have been compared in the coastal upwelling ecosystems off northwest Africa, Baja California, and southern Peru. Northwest Africa is characterized by shelf break upwelling and as a result standing stocks, macrobenthic production and sediment organic matter are highest out at the shelf-slope boundary. Sediment microbial activity and biomass on the other hand are highest nearshore in the dynamic zone where aeolian silt and sand are being blown into the sea from the Sahara Desert. Baja California is dominatd by the red crab Pleuroncodes planipes, having high rates of growth and metabolic utilization of organic matter, both on bottom and in the water. Peru benthos and metabolism are very different from the above areas because of the low oxygen concentrations in the bottom water. Organic matter is far higher in the sediment and heterotrophic metabolism is principally anaerobic rather than aerobic. A normal offshore benthic fauna is replaced by a mat of sulfur bacteria with unknown production and metabolic rates. Benthic subsystems in upwelling ecosystems can be placed in two categories: those overloaded with organic matter, depleted of oxygen and dominated by sulfate reduction and those that are are not overloaded and remain aerobic. Peru and southwest Africa typify overloaded systems whereas NW Africa and Baja California are examples of aerobic systems. Although benthic metabolism and inorganic nutrient regeneration are high in both types of subsystems, all upwelling ecosystems, with their dynamic open boundaries, export organic particulate matter and import inorganic nutrients at rates that are far in excess of that consumed or produced by benthic metabolism.en_US
dc.description.sponsorshipUnited States Department of Energy. Contract No. DE-AC02-76CH00016en_US
dc.identifier.citationRowe, Gilber T. 1985. "Benthic production and processes off Baja California, Northwest Africa and Peru: a classification of benthic subsystems in upwelling ecosystems." Simposio Internatinal sobre las Areas de Afloramiento mas importantes del Oeste African (Cabo Blanco y Benguela). Vol II: 589-612.en_US
dc.identifier.urihttp://hdl.handle.net/1969.3/28322
dc.language.isoenen_US
dc.publisherInstituto de Investigaciones Pesqueras.en_US
dc.subjectbenthosen_US
dc.subjectupwelling areasen_US
dc.subjectbiomassen_US
dc.subjectproductionen_US
dc.subjectmetabolismen_US
dc.titleBenthic production and processes off Baja California, Northwest Africa and Peru: a classification of benthic subsystems in upwelling ecosystemsen_US
dc.typeArticleen_US
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