沖縄備瀬のサンゴと海草の共存海域における溶存有機炭素と微生物の役割

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The coexistence of seagrasses and corals at Bise, Okinawa, Japan, was investigated in terms of nutrient dynamics, dissolved organic carbon (DOC), and microbial abundance. Four incubation conditions (seawater, seagrass, coral, and seagrass with coral [sg+cr]) were examined using in situ incubation methods. 13C was used as a tracer to evaluate primary production in the water column and carbon fixation in seagrass and coral tissues. Primary production was higher in the water column in seagrass incubations, resulting in increased dissolved oxygen (DO) concentrations in the surrounding water. In this treatment, DO was also significantly positively correlated with DOC concentration. Seagrass produced higher amounts of DOC in sg+cr compared to coral incubations (1.2 ± 8.8 μM) by generating 21.6 ± 19.1 μM into the water column. DOC concentrations in the seawater were positively correlated with bacterial abundance. Bacteria are important in the recycling of carbon in the system of coexisting coral and seagrasses due to their use of DOC exuded from both seagrasses and coral, which, in turn, enhances the assimilation of carbon by corals. Therefore, the production of carbon in coral tissues increased when coral was incubated together with seagrass. Similarly, nutrient uptake was highest in the sg+cr incubations. In this environment, where seagrass and coral coexist, corals can utilize DOC exuded by seagrass to increase carbon assimilation via microbial activity, while seagrass can assimilate nutrients and microbially degraded DOC from coral metabolism in the environment.
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沖縄備瀬のサンゴと海草の共存海域における溶存有機炭素と微生物の役割

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