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Distribution and origin of sedimentary organic matter in an eutrophic estuary: Pina Sound – NE Brazil
- Source :
- Anais da Academia Brasileira de Ciências v.93 n.1 2021, Anais da Academia Brasileira de Ciências, Academia Brasileira de Ciências (ABC), instacron:ABC, Anais da Academia Brasileira de Ciências, Volume: 93, Issue: 1, Article number: e20190638, Published: 15 JAN 2021, Anais da Academia Brasileira de Ciências, Vol 93, Iss 1 (2021)
- Publication Year :
- 2021
- Publisher :
- Academia Brasileira de Ciências, 2021.
-
Abstract
- Eutrophic estuaries receive organic matter (OM) inputs from multiple sources. This study evaluated the distribution and origin of sedimentary OM in an eutrophic estuary (Pina Sound, NE Brazil). Thirteen samples were collected in the sublittoral in addition to major local sources. Biochemical (chlorophyll - Chl), elemental [(C/N)a and C/S ratios] and isotopic (δ 15N and δ 13C) analyses were carried out for characterizing OM and redox conditions. The SIAR mixing model was used to quantify contribution from main sources. At Pina Sound, distribution of OM is associated with mud, reflecting the hydrodynamics control on deposition of suspended particles. Microphytobenthic production is limited ([Chl a] < 1000 µg/g organic carbon) in the sublittoral where the Chl degradation products prevail (mean [Pheopigments] = 2643 ± 958 µg/g organic carbon). Anoxic conditions (C/S ratio ≈ 2) are typically observed in sediments of deeper portions of Pina Sound. Such sediments receive high organic loads and are subject to poor water renewal. According to SIAR mixing model, sedimentary OM of Pina Sound is composed of, on average: 50% phytoplankton, 24% sewage and 26% C3 plants. This reflects fertilization of Pina Sound with high loads of untreated sewage. Pina Sound has a great potential to retain sewage-derived OM.
- Subjects :
- 0106 biological sciences
Geologic Sediments
010504 meteorology & atmospheric sciences
Science
stable nitrogen isotope
01 natural sciences
Phytoplankton
Sedimentary organic matter
sewage
Organic matter
chlorophyll
0105 earth and related environmental sciences
Total organic carbon
chemistry.chemical_classification
geography
Carbon Isotopes
Multidisciplinary
geography.geographical_feature_category
010604 marine biology & hydrobiology
Estuary
mixing model
stable carbon isotope
Deposition (aerosol physics)
chemistry
Isotopes of carbon
Environmental chemistry
Environmental science
Eutrophication
Estuaries
Brazil
Environmental Monitoring
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Anais da Academia Brasileira de Ciências v.93 n.1 2021, Anais da Academia Brasileira de Ciências, Academia Brasileira de Ciências (ABC), instacron:ABC, Anais da Academia Brasileira de Ciências, Volume: 93, Issue: 1, Article number: e20190638, Published: 15 JAN 2021, Anais da Academia Brasileira de Ciências, Vol 93, Iss 1 (2021)
- Accession number :
- edsair.doi.dedup.....6fdbc6ce8d68bf3f82ad688b18884a58