Distribution of microaerophilic bacteria through the oxic-anoxic transition zone of lagoon sediments |
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Authors: | Maria J Ferrara-Guerrero Armand Bianchi |
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Institution: | (1) Microbiologie Marine CNRS UPR 223, Faculté des Sciences de Luminy, 70, route Léon Lachamp, 13288 Marseille cedex 09, France |
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Abstract: | In marine sediments, where soluble gases diffuse only very slightly, many organisms struggle for molecular oxygen. Microaerophilic bacteria, able to grow at reduced pO2 between 0.2 and 12%, have an advantage. Distribution of aerobes, microaerophiles and anaerobes was compared with the oxygen gradient in seawater and sediment samples collected in a northern Mediterranean lagoon. In the near bottom seawater and in the 0–10 mm upperlayer of sediment, the microaerophilic counts were less than 1% of aerobe densities. In the 10–15 mm zone, these two groups were equivalent in density (1 × 105 cells ml–1). As expected, the microaerophiles took advantage of their low oxygen tension requirements in the subsurface sediments, between the well aerated zone (0–5 mm depth) and the low redox potential zone. Then, beyond a depth of 20 mm, the anaerobes prevailed in this sandy clay. |
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Keywords: | seawater marine sediments bacteria anaerobes microaerophiles oxygen concentration |
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