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