The impact of easily oxidized material (EOM) on the meiobenthos: Foraminifera abnormalities in shrimp ponds of New Caledonia; implications for environment and paleoenvironment survey |
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Institution: | 1. Division of Applied Geophysics, Luleå University of Technology, S-97187 Luleå, Sweden;2. Faculty of Technology and Environment, Prince of Songkla University, 83120 Kathoo, Phuket,Thailand;3. Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden;4. Division of Applied Geology, Luleå University of Technology, S-97187 Luleå, Sweden |
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Abstract: | This study was carried out in shrimp ponds from New Caledonia, in order to determine the cause of the exceptional proportion of abnormal tests (FAI) (often >50%, sometimes >80%). FAI was positively correlated to the quantity of easily oxidized material (EOM) deposited on the bottom of the ponds and to the sediment oxygen demand, and negatively correlated to redox. These results suggest that a very high FAI is a potential indicator for great accumulations of native organic matter, leading to a high sediment oxygen demand. When studying ancient sediments in core samples, exceptional abundances of abnormal tests may indicate periods of high accumulation of EOM, and therefore of oxygen depletion. This finding should help in better management of aquaculture ponds, but should also allow new insight into the interpretation of sedimentary records, providing a useful proxy for paleoenvironmental reconstructions. |
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