Oxygen deficiency and benthic communities in the peruvian upper continental margin

The oxygen minimum zone (OMZ) off the Peruvian coast, though shallower and more intense than other OMZs, exhibits a spatial distribution that varies with latitude, depth and distance to the coast. The spatial variability in oxygen content imposes latitudinal and bathymetric zonations of the benthic...

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Autores principales:	Gutiérrez,Dimitri, Quipúzcoa,Luis, Enríquez,Edgardo
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2006
Materias:	OMZ Peru benthos Thioploca Pearson and Rosenberg model
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300008
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spelling	oai:scielo:S0717-653820060003000082007-10-30Oxygen deficiency and benthic communities in the peruvian upper continental marginGutiérrez,DimitriQuipúzcoa,LuisEnríquez,Edgardo OMZ Peru benthos Thioploca Pearson and Rosenberg model The oxygen minimum zone (OMZ) off the Peruvian coast, though shallower and more intense than other OMZs, exhibits a spatial distribution that varies with latitude, depth and distance to the coast. The spatial variability in oxygen content imposes latitudinal and bathymetric zonations of the benthic communities. Nevertheless the spatial patterns of the benthic communities are also modulated by the bottom topography and the sedimentary environments, which in turn are controlled to a large extent by the poleward undercurrent. While the bathymetric patterns of the macro- and meiobenthos have been previously described, latitudinal changes have received less attention. We found that, in parallel with opposed latitudinal gradients of oxygen and fresh organic matter load in the sediments, there is a latitudinal sequence in the distribution of macrofaunal biomass, diversity and density, as described by the Pearson and Rosenberg model (1978) for the macrobenthic response under organic enrichment. This latitudinal pattern is complemented by the maximum development of the giant sulphur nitrate vacuolated bacteria Thioploca spp. under more extreme oxygen deficiency (but not anoxia) and organic load than the macrofauna is able to cope with. Temporal variability in the OMZ also results in significant responses of the benthic communities, but there are differences in the sign and intensity according to the sedimentary environment. In the organic-rich sediments off the central Peruvian shelf, different benthic states, involving the macrobiotic components (infauna and Thioploca) and the meiofauna, are triggered by the varying subsurface oxygen regime.info:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana (Concepción) v.70 suppl.1 20062006-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300008en10.4067/S0717-65382006000300008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	OMZ Peru benthos Thioploca Pearson and Rosenberg model
spellingShingle	OMZ Peru benthos Thioploca Pearson and Rosenberg model Gutiérrez,Dimitri Quipúzcoa,Luis Enríquez,Edgardo Oxygen deficiency and benthic communities in the peruvian upper continental margin
description	The oxygen minimum zone (OMZ) off the Peruvian coast, though shallower and more intense than other OMZs, exhibits a spatial distribution that varies with latitude, depth and distance to the coast. The spatial variability in oxygen content imposes latitudinal and bathymetric zonations of the benthic communities. Nevertheless the spatial patterns of the benthic communities are also modulated by the bottom topography and the sedimentary environments, which in turn are controlled to a large extent by the poleward undercurrent. While the bathymetric patterns of the macro- and meiobenthos have been previously described, latitudinal changes have received less attention. We found that, in parallel with opposed latitudinal gradients of oxygen and fresh organic matter load in the sediments, there is a latitudinal sequence in the distribution of macrofaunal biomass, diversity and density, as described by the Pearson and Rosenberg model (1978) for the macrobenthic response under organic enrichment. This latitudinal pattern is complemented by the maximum development of the giant sulphur nitrate vacuolated bacteria Thioploca spp. under more extreme oxygen deficiency (but not anoxia) and organic load than the macrofauna is able to cope with. Temporal variability in the OMZ also results in significant responses of the benthic communities, but there are differences in the sign and intensity according to the sedimentary environment. In the organic-rich sediments off the central Peruvian shelf, different benthic states, involving the macrobiotic components (infauna and Thioploca) and the meiofauna, are triggered by the varying subsurface oxygen regime.
author	Gutiérrez,Dimitri Quipúzcoa,Luis Enríquez,Edgardo
author_facet	Gutiérrez,Dimitri Quipúzcoa,Luis Enríquez,Edgardo
author_sort	Gutiérrez,Dimitri
title	Oxygen deficiency and benthic communities in the peruvian upper continental margin
title_short	Oxygen deficiency and benthic communities in the peruvian upper continental margin
title_full	Oxygen deficiency and benthic communities in the peruvian upper continental margin
title_fullStr	Oxygen deficiency and benthic communities in the peruvian upper continental margin
title_full_unstemmed	Oxygen deficiency and benthic communities in the peruvian upper continental margin
title_sort	oxygen deficiency and benthic communities in the peruvian upper continental margin
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300008
work_keys_str_mv	AT gutierrezdimitri oxygendeficiencyandbenthiccommunitiesintheperuvianuppercontinentalmargin AT quipuzcoaluis oxygendeficiencyandbenthiccommunitiesintheperuvianuppercontinentalmargin AT enriquezedgardo oxygendeficiencyandbenthiccommunitiesintheperuvianuppercontinentalmargin
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Oxygen deficiency and benthic communities in the peruvian upper continental margin

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