Article Dans Une Revue Marine Pollution Bulletin Année : 2024

Phosphate buffering in mangrove sediment pore water under eutrophication and deforestation influences

Grazielle Nascimento-Silva
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Gabriela B Oliveira
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Christiene R.L. Matos
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Christian J Sanders
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Humberto Marotta
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Rut Díaz
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Gwenaël Abril
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Wilson Machado
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Résumé

Phosphorus (P) behavior was evaluated in mangrove wetlands impacted by urban sewage, including a deforested site. Sediment cores were analyzed for grain size, organic carbon, total nitrogen, stable isotopes (δ 13 C and δ 15 N), P contents, and pore water PO 4 3-concentrations and net consumption/production rates. Under stronger eutrophication influence, significantly higher P (1390 vs. <1000 μg/g), δ 15 N (8.9 vs. <6.7 ‰) and algal material contents (with lower C/N ratio and heavier δ 13 C) occurred. Depth-integrated PO 4 3-consumption rates in eutrophicated sites were up to two orders of magnitude higher (at the deforested site) than in a moderately preserved mangrove. The whole core of the moderately preserved site presented no saturation of PO 4 3-buffering capacity, while more eutrophicated sites developed buffering zones saturated at ~18-26 cm depth. Contrasting to nearby subtidal environments, eutrophication did not cause larger pore water PO 4 3-concentration, evidencing the role of PO 4 3-buffering on P filtering by mangrove wetlands.
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Dates et versions

hal-04469670 , version 1 (06-01-2025)

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Grazielle Nascimento-Silva, Gabriela B Oliveira, Christiene R.L. Matos, Edouard Metzger, Christian J Sanders, et al.. Phosphate buffering in mangrove sediment pore water under eutrophication and deforestation influences. Marine Pollution Bulletin, 2024, 201, pp.116130. ⟨10.1016/j.marpolbul.2024.116130⟩. ⟨hal-04469670⟩
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