Sedimentary inputs and oxygen uptake by the sediment in Lake Geneva (Switzerland) |
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Authors: | Pierre Hutter Dr Claude Lang |
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Institution: | (1) Present address: Conservation de la faune and Institut de Zoologie et d'Ecologie animale, rue César-Roux 16, CH-1005 Lausanne, Switzerland |
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Abstract: | Sediment cores and sediment traps were collected twice a month in two 35 m deep stations of Lake Geneva (Switzerland). The
organic input sedimenting to the bottom is equal to 157 g C m−2y−1 in station 1, to 214 g C in station 2. In spite of this difference, the oxygen uptake by the sediment (OUS) is similar in
both locations (46–47 g C m−2y−1). The oxygen uptake by the matter sedimenting to the bottom (OUSM) is respectively 45 g C m−2y−1 and 41 g C in stations 1 and 2. The equivalence between OUS and OUSM implies that most of the sedimented matter arriving
to the bottom is directly oxidized at the sediment surface. In station 1, OUS is positively correlated to OUSM, and OUSM is
positively correlated to chlorophyll-a concentrations in the water column (0–20 m) one week before sediment sampling. In location
2, OUS is positively correlated to the percentage of organic carbon and nitrogen in the sedimented matter, negatively to its
C:N ratio. Increasing allochthonous inputs have a negative influence on benthic respiration. At both sites, OUS is not directly
related to macrobenthic biomass or to temperature of bottom water. |
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