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• W4386913864 endingPage "740109" @default.
• W4386913864 startingPage "740109" @default.
• W4386913864 abstract "Semi-enclosed bay provides favorable conditions for mariculture, however, mariculture activities can disrupt hydrological connectivity of river-coastal continuum and create a bioreactor for particulate organic matter (POM). The impacts of increasing mariculture activities on POM dynamics, including sources, transportation, and transformation, associated dissolved oxygen and nutrients in semi-enclosed bays remain unclear. This study investigated carbon and nitrogen contents, as well as the stable isotopic compositions of POM (δ13CPOC and δ15NPN) in a semi-enclosed bay, Sansha Bay, which is the largest mariculture bay for large yellow croaker in China and is influenced by riverine input and nearshore coastal waters. Our findings revealed that, spatially, riverine POM dominated along main channel that connects river inlet and bay outlet under the influence of water mixing (C:N ratios ~5.7–15.8, δ13CPOC ~ −21‰--24‰, and δ15NPN ~ 13‰-17‰). On top of water mixing, autochthonous POM dominates in off-main channel (C:N ratio 5–9, δ13CPOC -21‰--17‰, and δ15NPN 7.0‰-8.5‰). Using a three end-member isotopic mixing model, our data shows that the POM in main channel comprises ~90% of riverine POM and ~ 10% of phytoplankton production, while in off-main channel, ~59% of POM was contributed by autochthonous phytoplankton production and the rest ~41% was sourced from main channel. Furthermore, riverine POM degradation consumes oxygen along main channel, forming consistent with the classic Redfield stoichiometry of aerobic respiration (N:O2, ~0.13 ± 0.02). In contrast, in off-main channel where water exchange is slower, the degradation of fish feed regenerates dissolved inorganic nitrogen, which subsequently stimulates phytoplankton production, leading to oxygen production following the canonical Redfield stoichiometry of phytoplankton photosynthesis (N:O2, ~0.10 ± 0.01). Our results highlight the influence of hydrological connectivity, superimposed by mariculture activity, in shaping POM biogeochemistry and dissolved oxygen dynamics in semi-enclosed bays. These findings provide important insights for the remediation of risks of hypoxia and harmful algal blooms in coastal mariculture ecosystems." @default.
• W4386913864 created "2023-09-22" @default.
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• W4386913864 date "2024-01-01" @default.
• W4386913864 modified "2023-10-07" @default.
• W4386913864 title "Hydrological connectivity controls on the dynamics of particulate organic matter in a semi-enclosed mariculture bay" @default.
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• W4386913864 doi "https://doi.org/10.1016/j.aquaculture.2023.740109" @default.
• W4386913864 hasPublicationYear "2024" @default.
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