Oxygen profiles in intertidal sediments of Ria Formosa (S. Portugal) |
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Authors: | Vanda Brotas Ana Amorim-Ferreira Carlos Vale Fernando Catarino |
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Institution: | (1) Departamento de Biologia Vegetal, Faculdade de Ciências de Lisboa, Campo Grande, Bloco C2, 1700 Lisboa, Portugal;(2) Instituto Nacional de Investigação des Pescas, Av. Brasília, 400 Lisboa, Portugal |
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Abstract: | Microelectrode oxygen profiles were measured in intertidal sediments from Ria Formosa (S. Portugal), a very productive shallow coastal lagoon. Four intertidal sampling sites were selected according to different sediment characteristics. Individual profiles revealed a high degree of lateral variability on a centimeter spatial scale. Nevertheless, consistent differences were observed between oxygen profiles measured in atmosphere-exposed and inundated intertidal sediments: in organically poor sand oxygen-penetration depth varied from 3 mm in inundated cores to more than 7 mm in exposed ones, while in organically rich muddy sand and mud it remained between 0.5–2.0 mm. The oxygen input from inundated to exposed conditions was estimated for each sampling site. Semi-diurnal tidal fluctuation, leading to periodical atmospheric exposure of sediments plays a major role in the oxygenation process of intertidal zones of Ria Formosa. |
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Keywords: | oxygen profiles sediment-water interface intertidal zones |
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