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Título:
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El Niño and similar perturbation effects on the benthos of the Humboldt, California, and Benguela Current upwelling ecosystems (2006)
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Autores:
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Arntz, Wolf E., Autor ;
Gallardo, Victor A., Autor ;
Gutiérrez Aguilar, Dimitri, Autor ;
Isla, Enrique, Autor ;
Levin, Lisa A., Autor ;
Jaime Mendo, Autor ;
Neira, Carlos, Autor ;
Gilbert T. Rowe, Autor ;
Tarazona, juan, Autor ;
Wolff, Matthias, Autor
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Tipo de documento:
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Article : documento electrónico
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En :
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Advances in Geosciences (2006 vol. 6, Variada)
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Artículo en la página:
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pp. 243–265
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Idiomas:
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Inglés
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Clasificación:
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Afloramiento
Bentos
Corriente de Humboldt
Fenómeno El Niño
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Resumen:
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To a certain degree, Eastern Boundary Current (EBC) ecosystems are similar: Cold bottom water from moderate depths, rich in nutrients, is transported to the euphotic zone by a combination of trade winds, Coriolis force and Ekman transport. The resultant high primary production fuels a rich secondary production in the upper pelagic and nearshore zones, but where O2 exchange is restricted, it creates oxygen minimum zones (OMZs) at shelf and upper slope (Humboldt and Benguela Current) or slope depths (California Current). These hypoxic zones host a specifically adapted, small macro- and meiofauna together with giant sulphur bacteria that use nitrate to oxydise H2S. In all EBC, small polychaetes, large nematodes and other opportunistic benthic species have adapted to the hypoxic conditions and co-exist with sulphur bacteria, which seem to be particularly dominant off Peru and Chile. However, a massive reduction of macrobenthos occurs in the core of the OMZ. In the Humboldt Current area the OMZ ranges between
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En línea:
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https://repositorio.imarpe.gob.pe/handle/20.500.12958/10035
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