Metazoan meiofauna within the oxygen-minimum zone off Chile: Results of the 2001-PUCK expedition

Gritta Veit-Köhler, Dieter Gerdes, EDUARDO JOEL QUIROGA JAMETT, Dierk Hebbeln, Javier Sellanes

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24 Scopus citations

Abstract

A quantitative study of metazoan meiofauna was carried out at continental shelf and slope stations affected by the oxygen-minimum zone in the eastern South Pacific off Chile. Densities of meiobenthos at the investigated stations off Antofagasta (22°S), Concepción (36°S), and Chiloé (42°S) ranged from 1282.1 to 8847.8 ind 10 cm-2. Oxygen deficiency led only to average abundances, despite higher food availability and freshness at the corresponding sites. Sediment organic carbon, chlorophyll-a, and phaeopigment contents were used as measures of the input from water-column primary production, which accumulated at the oxygen-minimum zone stations. The highest abundances were found at a station with an oxygen content of 0.79 mL L-1, which was slightly elevated from what is defined as oxygen minimum (0.5 mL L-1). The most oxygenated site yielded the lowest densities. Meiofauna assemblages became more diverse with increasing bottom-water oxygenation, whereas nematodes were the most abundant taxon at every station, followed by annelids, copepods, and nauplii.

Original languageEnglish
Pages (from-to)1105-1111
Number of pages7
JournalDeep-Sea Research Part II: Topical Studies in Oceanography
Volume56
Issue number16
DOIs
StatePublished - 15 Jul 2009

Keywords

  • Continental margin
  • Copepoda
  • Meiofauna communities
  • Nematoda
  • Oxygen-deficient sediments
  • Oxygen-minimum zone

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