Metazoan meiofauna within the oxygen-minimum zone off Chile: Results of the 2001-PUCK expedition |
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| Institution: | 1. Senckenberg Research Institute, DZMB-German Centre for Marine Biodiversity Research, Südstrand 44, 26382 Wilhelmshaven, Germany;2. Alfred-Wegener-Institute for Polar- and Marine Research, Columbusstr., 27568 Bremerhaven, Germany;3. Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Bilbao 449, Coyhaique, Chile;4. MARUM—Center for Marine Environmental Sciences, University of Bremen, Leobener Straße, 28359 Bremen, Germany;5. Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile;1. Department of Oceanography & Center for Oceanographic Research in the eastern South Pacific University of Concepcion PO Box 160-C, Concepcion, Chile;2. Department of Oceanography & Center for Oceanographic Research in the eastern South Pacific University of Concepcion PO Box 160-C, Concepcion, Chile;1. Departamento de Biologia & CESAM, Universidade de Aveiro, Aveiro, Portugal;2. Departamento de Biologia, Universidade de Aveiro, Aveiro, Portugal;3. Centro de Biologia Molecular Ambiental (CBMA), Departamento de Biologia, Universidade do Minho, Braga, Portugal;1. Ifremer, Unité de Sciences et Technologies halieutiques, Station de Lorient, 8 rue François Toullec, F-56325 Lorient Cedex, France;2. Laboratoire d’Océanologie et de Géosciences (UMR CNRS 8187 LOG), Université de Lille 1, sciences et technologies, Station Marine de Wimereux, 28 Avenue Foch, 62930 Wimereux, France;3. Ifremer, Laboratoire Ressources Halieutiques, 150 Quai Gambetta BP 699, F-62321 Boulogne-sur-Mer, France;1. Department of Animal Biology, Institute of Biology, University of Campinas, Campinas, Brazil;2. Department of Biological Oceanography, Oceanographic Institute, University of São Paulo, São Paulo, Brazil;1. Institute of Estuarine and Coastal Studies, University of Hull, UK;2. Department of Biology & CESAM, University of Aveiro, Portugal |
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| 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. |
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