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Minu A, Routh J, Dario M, Bilosnic M, Kalén R, Val Klump J, Machiwa JF. Temporal and spatial distribution of trace metals in the Rufiji delta mangrove, Tanzania. ENVIRONMENTAL MONITORING AND ASSESSMENT 2018; 190:336. [PMID: 29744600 PMCID: PMC5943377 DOI: 10.1007/s10661-018-6707-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 04/26/2018] [Indexed: 05/09/2023]
Abstract
Spatial and temporal distribution of trace metals and their cycling is a key issue for understanding the ongoing biogeochemical processes in coastal environments. Sediment cores were collected from six different sampling locations from the Rufiji delta mangrove forests in southeastern coastal Tanzania that are perceived to be impacted by urban development and agricultural activities in the catchment, and pollution in upstream sections of the Rufiji River. The chronology and sediment accumulation rates at these sampling sites were derived based on the distribution of 210Pbexcess method. The trace metals (As, Cd, Cr, Cu, Ni, Pb, and Zn) were sequentially extracted as per the BCR method and analyzed. The results indicate that the mass accumulation rates range from 0.40 g cm-2 year-1 (cores NR3 and NR4) to 1.75 g cm-2 year-1 (core SR1). Trace metals in the cores are mainly associated with the residual phase and their abundances in sediments are ranked as Cr > Zn > Ni > Cu > Pb > Cd. The results imply that trace metals in the Rufiji delta mangroves are mainly of crustal origin, and they are less sensitive to weathering. Further, these metals are least available for uptake by plants and they pose limited threat to the biota.
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Affiliation(s)
- Andrew Minu
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, Box 35064, Dar es Salaam, Tanzania
| | - Joyanto Routh
- Department of Thematic Studies-Environmental Change, Linköping University, SE-58183, Linköping, Sweden.
| | - Mårten Dario
- Department of Thematic Studies-Environmental Change, Linköping University, SE-58183, Linköping, Sweden
| | - Mario Bilosnic
- Department of Thematic Studies-Environmental Change, Linköping University, SE-58183, Linköping, Sweden
| | - Rikard Kalén
- Department of Thematic Studies-Environmental Change, Linköping University, SE-58183, Linköping, Sweden
| | - J Val Klump
- School of Freshwater Sciences, Great Lakes WATER Institute, 600 E. Greenfield Ave., Milwaukee, WI, 53204, USA
| | - John F Machiwa
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, Box 35064, Dar es Salaam, Tanzania
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Banci KRDS, Mori GM, Oliveira MAD, Paganelli FL, Pereira MR, Pinheiro MAA. Can environmental pollution by metals change genetic diversity? Ucides cordatus (Linnaeus, 1763) as a study case in Southeastern Brazilian mangroves. MARINE POLLUTION BULLETIN 2017; 116:440-447. [PMID: 28129923 DOI: 10.1016/j.marpolbul.2017.01.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 01/13/2017] [Accepted: 01/19/2017] [Indexed: 06/06/2023]
Abstract
Industrial areas on estuarine systems are commonly affected by heavy metals, affecting all local biota. Random Amplified Polymorphic DNA (RAPD) was used to evaluate genetic diversity of Ucides cordatus at mangroves in southeastern Brazil (Juréia, J; São Vicente, SV; and Cubatão, C), with distinct pollution levels by metals. The genetic diversity of this species was compared with concentrations of metals (Cd, Pb, Cu, Cr and Hg) in the environment. A pollution gradient was confirmed (SV>C>J), with low levels detected in water, except for mercury in SV. All metals in the sediment samples were below Threshold Effect Level (TEL), without an apparent biological risk to the biota. Genetic distance was very similar between J and C, with SV occurring as an out-group. RAPD was a powerful tool to investigate the effect of metal pollution on genetic diversity of this mangrove crab, and to evaluate the conservation status of the mangrove ecosystem.
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Affiliation(s)
| | - Gustavo Maruyama Mori
- UNESP - Univ Estadual Paulista, Instituto de Biociências (IB), Campus do Litoral Paulista (CLP) - Pç. Infante Dom Henrique, s/n° - Parque Bitaru, 11330-900 São Vicente (SP), Brazil
| | - Marcos Antonio de Oliveira
- UNESP - Univ Estadual Paulista, Instituto de Biociências (IB), Campus do Litoral Paulista (CLP) - Pç. Infante Dom Henrique, s/n° - Parque Bitaru, 11330-900 São Vicente (SP), Brazil
| | | | | | - Marcelo Antonio Amaro Pinheiro
- UNESP - Univ Estadual Paulista, Instituto de Biociências (IB), Campus do Litoral Paulista (CLP) - Pç. Infante Dom Henrique, s/n° - Parque Bitaru, 11330-900 São Vicente (SP), Brazil; Grupo de Pesquisa em Biologia de Crustáceos (CRUSTA), Brazil.
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Douglas EJ, Pilditch CA, Hines LV, Kraan C, Thrush SF. In situ soft sediment nutrient enrichment: A unified approach to eutrophication field experiments. MARINE POLLUTION BULLETIN 2016; 111:287-294. [PMID: 27389457 DOI: 10.1016/j.marpolbul.2016.06.096] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 06/09/2016] [Accepted: 06/27/2016] [Indexed: 06/06/2023]
Abstract
Adding fertiliser to sediments is an established way of studying the effects of eutrophication but a lack of consistent methodology, reporting on enrichment levels, or guidance on application rates precludes rigorous synthesis and meta-analysis. We developed a simple enrichment technique then applied it to 28 sites across an intertidal sandflat. Fertiliser application rates of 150 and 600gNm(-2) resulted in pore water ammonium concentrations respectively 1-110 and 4-580×ambient, with greater elevations observed in deeper (5-7cm) than surface (0-2cm) sediments. These enrichment levels were similar to eutrophic estuaries and were maintained for at least seven weeks. The high between-site variability could be partially explained by the sedimentary environment and macrofaunal community (42%), but only at the high application rate. We suggest future enrichment studies should be conducted in situ across large environmental gradients to incorporate real world complexity and increase generality of conclusions.
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Affiliation(s)
- Emily J Douglas
- School of Science, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand.
| | - Conrad A Pilditch
- School of Science, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand
| | - Laura V Hines
- School of Science, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand
| | - Casper Kraan
- National Institute of Water and Atmospheric Research, P.O. Box 11-115, Hamilton 3251, New Zealand
| | - Simon F Thrush
- Institute of Marine Science, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Machado W, Sanders CJ, Santos IR, Sanders LM, Silva-Filho EV, Luiz-Silva W. Mercury dilution by autochthonous organic matter in a fertilized mangrove wetland. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 213:30-35. [PMID: 26874872 DOI: 10.1016/j.envpol.2016.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 01/29/2016] [Accepted: 02/01/2016] [Indexed: 06/05/2023]
Abstract
A dated sediment core from a highly-fertilized mangrove wetland located in Cubatão (SE Brazil) presented a negative correlation between mercury (Hg) and organic carbon contents. This is an unusual result for a metal with well-known affinity to organic matter. A dilution of Hg concentrations by autochthonous organic matter explained this observation, as revealed by carbon stable isotopes signatures (δ(13)C). Mercury dilution by the predominant mangrove-derived organic matter counterbalanced the positive influences of algal-derived organic matter and clay contents on Hg levels, suggesting that deleterious effects of Hg may be attenuated. Considering the current paradigm on the positive effect of organic matter on Hg concentrations in coastal sediments and the expected increase in mangrove organic matter burial due to natural and anthropogenic stimulations of primary production, predictions on the influences of organic matter on Hg accumulation in mangrove wetlands deserve caution.
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Affiliation(s)
- Wilson Machado
- Departamento de Geoquímica, Instituto de Química, Universidade Federal Fluminense, Niterói, RJ, 24020-150, Brazil.
| | - Christian J Sanders
- National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, P.O. Box 157, Coffs Harbour, NSW, 2540, Australia
| | - Isaac R Santos
- National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, P.O. Box 157, Coffs Harbour, NSW, 2540, Australia
| | - Luciana M Sanders
- Southern Cross Geoscience, School of Environment, Science and Engineering, Southern Cross University, Lismore, NSW, 2480, Australia
| | - Emmanoel V Silva-Filho
- Departamento de Geoquímica, Instituto de Química, Universidade Federal Fluminense, Niterói, RJ, 24020-150, Brazil
| | - Wanilson Luiz-Silva
- Instituto de Geociências, Universidade Estadual de Campinas, Campinas, SP, 13083-970, Brazil
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