Journal article
Seasonal changes in metal and nutrient fluxes across the sediment-water interface in tropical mangrove creeks in the Amazon region
Applied Geochemistry, Vol.138, pp.1-13
03/2022
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Abstract
Mangrove creeks are considered important routes between terrestrial and adjacent coastal waters regarding the transport of dissolved material to oceans. The present study assessed if Amazonian seasonal rainfall patterns affect the pore water biogeochemistry and the intensity and direction of nutrient (NH4+ and PO43−) and metal (Fe2+ and Mn2+) exchanges from intertidal creek mudflats fringed by pristine mangroves. The results indicate that mangrove-fringed mudflats are effective in retaining iron and nutrients in solid sediment phases compared to export to coastal waters, also potentially comprising a significant manganese contributor to coastal waters. However, nutrient and metal retention are lower during the wet season, as intense rainfall periods reduce pore water salinity and promote increased reducing sediment conditions. Such conditions enhance organic matter degradation and pore water NH4+, PO43−, Fe2+ and Mn2+ concentrations just below the sediment-water interface, generating higher effluxes during this period. Our findings demonstrate that seasonal variabilities drive substantial physicochemical property and pore water biogeochemistry changes, affecting the efficiency of mudflat sediments retaining and exporting nutrients and metals.
Details
- Title
- Seasonal changes in metal and nutrient fluxes across the sediment-water interface in tropical mangrove creeks in the Amazon region
- Creators
- Christiene R.L Matos - Museu Paraense Emílio Goeldi/MCTIC, Belém, Pará, BrazilJosé F Berrêdo - Museu Paraense Emílio Goeldi/MCTIC, Belém, Pará, BrazilWilson Machado - Universidade Federal FluminenseEdouard Metzger - Laboratoire de Planétologie et Géosciences, CNRS, Université d’Angers, Nantes Université, Le Mans Université, Angers, FranceChristian J Sanders - Southern Cross UniversityKelson C.F Faial - Instituto Evandro ChagasMarcelo C.L Cohen - Universidade Federal do Pará
- Publication Details
- Applied Geochemistry, Vol.138, pp.1-13
- Publisher
- Elsevier Ltd
- Grant note
- The authors thank the research grants from the Brazilian Ministry of Education (CAPES) and the Brazilian Research Council (CNPq) to the first author C.R.L. Matos. C.J. Sanders is supported by the Australian Research Council (DE160100443) and E. Metzger by CNRS-EC2CO project Vubleu. W. Machado thanks the CAPES-Print-Feedbacks Project (Proc. No. 88887.310301/2018-00). Rut Diaz from Universidade Federal Fluminense (UFF) is thanked for her assistance with the pyrite analysis.
- Identifiers
- 991012994284802368
- Copyright
- © 2022 Elsevier Ltd. All rights reserved.
- Academic Unit
- Faculty of Science and Engineering; National Marine Science Centre; Science
- Language
- English
- Resource Type
- Journal article