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- W2181658596 abstract "In a study organized by the Mie Prefectural Government, an artificial tidal flat was created on a sandy shore in Ago Bay using enriched sediments that had been dredged from pearl oyster farms. The aim of the artificial tidal flat (ATF) was to remove enriched sediments from pearl oyster farms and to re-mineralize the organic matter in the sediment through the activity by the biota. We investigated the trophic structure of the macrobenthos on the intertidal flat before (November, 2003) and after (November, 2004 and 2005) the ATF was constructed using the stable carbon and nitrogen isotope technique in order to evaluate the effect of the ATF. Before the ATF, the consumers were classified into four groups: group A, which was composed of suspension feeders and characterized by depleted δ 13 C values (-19.5 to -18.0‰), group B, in which members had intermediate δ 13 C values (-14.8 to -12.1‰), group C, in which members had enriched δ 13 C values (-11.5 to -10.7‰) and group D, in which members had enriched δ 15 N values (11.9 to 13.7‰). The members of groups A, B, and C are primary consumers and the food sources of each group are considered to have been a mixture of coastal phytoplankton and benthic microalgae, benthic microalgae, and a mixture of benthic microalgae and eelgrass or other unknown primary producers that have enriched δ 13 C values, respectively. The members of group D are secondary consumers. Benthic animals collected after ATF construction were also divided into four groups, however the number of species in groups C and D decreased due to the change of sediment composition from sand to sandy mud and to the short duration (8 months) after the completion of the ATF. After the ATF, the suspension feeding bivalves were enriched in 13 C by 0.6 to 1.4‰ and were depleted in 15 N by 0.5 to 1.3‰, suggesting the increased dependency on benthic microalgae that had increased their biomass by utilizing the nutrients from the pearl-oyster farm sediments." @default.
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- W2181658596 date "2010-01-01" @default.
- W2181658596 modified "2023-09-23" @default.
- W2181658596 title "Stable isotope analyses of the trophic structure of macrobenthos on an artificial tidal flat developed using sediments dredged from pearl oyster farms in Ago Bay." @default.
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