Accumulation of trace metals in grey mangrove Avicennia marina fine nutritive roots: The role of rhizosphere processes
TL;DR: Investigation of mangrove sediments and associated fine nutritive roots collected from five major embayments of Sydney estuary (Australia) for geochemical studies finds a strong linear correlation between metal concentrations in fine nutritives roots vs. total and bio-available contents in sediments.
About: This article is published in Marine Pollution Bulletin.The article was published on 2014-02-15. It has received 87 citations till now. The article focuses on the topics: Avicennia marina & Rhizosphere.
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TL;DR: Trace element contamination assessment, using different environmental contamination indices, reveals that As, Sb, Th and U are low to moderately contaminated while Cd is moderately to severely contaminated in the sediments of this area.
95 citations
TL;DR: Assessment of the distribution of some trace metals in the tissues of various mangrove plants developing downstream highly weathered ferralsols in New Caledonia found Cu and Zn metals had a greater mobility in the plant, and were characterized by high bioconcentration and translocation factors compared to the other metals.
88 citations
Cites background from "Accumulation of trace metals in gre..."
...Chaudhuri et al. (2014) observed a strong linear relationship between metal concentrations in fine nutritive roots of Avicennia and the total concentration in the sediment....
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TL;DR: In this paper, the authors have attempted to develop an improved index, which utilizes the information from the Normalized Difference Vegetation Index (NDVI) and the normalized Difference Water Index(NDWI) of Bhitarkanika mangrove forest of Odisha, India.
81 citations
TL;DR: Results found that the surface sediment in Nansha mangrove was severely contaminated with heavy metals, probably due to the discharge of industrial sewage into the Pearl River Estuary, indicating that heavy metal pollution has been deteriorating since 1979.
75 citations
TL;DR: This work developed a bioinformatic toolkit that includes BLAST databases, hidden Markov models and resources for gene-targeted assembly of nine arsenic resistance and metabolism genes and inferred their potential for horizontal and vertical transfer.
Abstract: Environmental resistomes include transferable microbial genes. One important resistome component is resistance to arsenic, a ubiquitous and toxic metalloid that can have negative and chronic consequences for human and animal health. The distribution of arsenic resistance and metabolism genes in the environment is not well understood. However, microbial communities and their resistomes mediate key transformations of arsenic that are expected to impact both biogeochemistry and local toxicity. We examined the phylogenetic diversity, genomic location (chromosome or plasmid), and biogeography of arsenic resistance and metabolism genes in 922 soil genomes and 38 metagenomes. To do so, we developed a bioinformatic toolkit that includes BLAST databases, hidden Markov models and resources for gene-targeted assembly of nine arsenic resistance and metabolism genes: acr3, aioA, arsB, arsC (grx), arsC (trx), arsD, arsM, arrA, and arxA. Though arsenic-related genes were common, they were not universally detected, contradicting the common conjecture that all organisms have them. From major clades of arsenic-related genes, we inferred their potential for horizontal and vertical transfer. Different types and proportions of genes were detected across soils, suggesting microbial community composition will, in part, determine local arsenic toxicity and biogeochemistry. While arsenic-related genes were globally distributed, particular sequence variants were highly endemic (e.g., acr3), suggesting dispersal limitation. The gene encoding arsenic methylase arsM was unexpectedly abundant in soil metagenomes (median 48%), suggesting that it plays a prominent role in global arsenic biogeochemistry. Our analysis advances understanding of arsenic resistance, metabolism, and biogeochemistry, and our approach provides a roadmap for the ecological investigation of environmental resistomes.
64 citations
References
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TL;DR: In this article, a modified ignition loss method is described for determining organic and carbonate carbon in calcareous sedimentary materials using equipment found in most laboratories and has been found to equal or excel the accuracy and precision of other methods tested and has the advantage of being considerably faster if large numbers of samples are to be analyzed.
Abstract: A modified ignition loss method is described for determining organic and carbonate carbon in calcareous sedimentary materials using equipment found in most laboratories. The method has been found to equal or excel the accuracy and precision of other methods tested and has the advantage of being considerably faster if large numbers of samples are to be analyzed.
2,939 citations
"Accumulation of trace metals in gre..." refers background in this paper
...Organic carbon was determined on air-dried and powdered samples by loss-on-ignition (LOI; at 550 C for 2 h) following Dean (1974)....
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TL;DR: In this paper, two basic strategies of plant response are suggested, accumulators and excluders, which do not generally suppress metal uptake but result in internal detoxification, and indicators are seen as a further mode of response where proportional relationships exist between metal levels in the soil, uptake and accumulation in plant parts.
Abstract: Plants colonizing metalliferous soils have evolved physiological mechanisms which enable them to tolerate metal toxicity. These mechanisms do not generally suppress metal uptake but result in internal detoxification. Two basic strategies of plant response are suggested, accumulators and excluders. In the former, metals can be concentrated in plant parts from low or high background levels. By contrast, differential uptake and transport between root and shoot in excluders, lead to more or less constant low shoot levels over a wide range of external concentration. ‘Indicators’ are seen as a further mode of response where proportional relationships exist between metal levels in the soil, uptake and accumulation in plant parts. The physiological properties of accumulator and excluder species are considered in relation to metal tolerance mechanisms.
2,035 citations
Old Dominion University1, University of Plymouth2, The Nature Conservancy3, University of Queensland4, Harvard University5, University of Tasmania6, New England Wild Flower Society7, University of the Philippines Los Baños8, Annamalai University9, Vrije Universiteit Brussel10, Tohoku Gakuin University11, University of New Hampshire12, Ho Chi Minh City University of Agriculture and Forestry13, Universiti Sains Malaysia14, Southeast Asian Fisheries Development Center15, Central Luzon State University16, Indonesian Institute of Sciences17, Shandong University18, Nanyang Technological University19
TL;DR: Across the globe, mangrove species found primarily in the high intertidal and upstream estuarine zones are the most threatened because they are often the first cleared for development of aquaculture and agriculture.
Abstract: Mangrove species are uniquely adapted to tropical and subtropical coasts, and although relatively low in number of species, mangrove forests provide at least US $1.6 billion each year in ecosystem services and support coastal livelihoods worldwide. Globally, mangrove areas are declining rapidly as they are cleared for coastal development and aquaculture and logged for timber and fuel production. Little is known about the effects of mangrove area loss on individual mangrove species and local or regional populations. To address this gap, species-specific information on global distribution, population status, life history traits, and major threats were compiled for each of the 70 known species of mangroves. Each species' probability of extinction was assessed under the Categories and Criteria of the IUCN Red List of Threatened Species. Eleven of the 70 mangrove species (16%) are at elevated threat of extinction. Particular areas of geographical concern include the Atlantic and Pacific coasts of Central America, where as many as 40% of mangroves species present are threatened with extinction. Across the globe, mangrove species found primarily in the high intertidal and upstream estuarine zones, which often have specific freshwater requirements and patchy distributions, are the most threatened because they are often the first cleared for development of aquaculture and agriculture. The loss of mangrove species will have devastating economic and environmental consequences for coastal communities, especially in those areas with low mangrove diversity and high mangrove area or species loss. Several species at high risk of extinction may disappear well before the next decade if existing protective measures are not enforced.
1,108 citations
"Accumulation of trace metals in gre..." refers background in this paper
...Currently, mangroves are increasingly threatened due to anthropogenic chemicals sourced from uncontrolled agricultural runoff, urban and industrial effluent and wastewaters, as well as with urbanization and population growth (MacFarlane et al., 2007; Vane et al., 2009; Polidoro et al., 2010)....
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TL;DR: Although mangroves evidently saved fewer lives than an early warning issued by the government, the retention of remaining mangrove in Orissa is economically justified even without considering the many benefits they provide to human society besides storm-protection services.
Abstract: Protection against coastal disasters has been identified as an important service of mangrove ecosystems. Empirical studies on this service have been criticized, however, for using small samples and inadequately controlling for confounding factors. We used data on several hundred villages to test the impact of mangroves on human deaths during a 1999 super cyclone that struck Orissa, India. We found that villages with wider mangroves between them and the coast experienced significantly fewer deaths than ones with narrower or no mangroves. This finding was robust to the inclusion of a wide range of other variables to our statistical model, including controls for the historical extent of mangroves. Although mangroves evidently saved fewer lives than an early warning issued by the government, the retention of remaining mangroves in Orissa is economically justified even without considering the many benefits they provide to human society besides storm-protection services.
490 citations
"Accumulation of trace metals in gre..." refers background in this paper
...…and estuaries in tropical and subtropical regions (e.g., Harbison, 1986; Lacerda et al., 1988; MacFarlane et al., 2003; Marchand et al., 2011; Wang et al., 2013) protecting coastlines from the devastating effects of erosion, storm surges and flooding (Das and Vincent, 2009; Zhang et al., 2012)....
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TL;DR: In this article, the inherent physical and chemical properties of mangrove muds confer an extraordinary capacity to accumulate materials discharged to the nearshore marine environment, and the sheltered, slack water environment of tidal swamps allows deposition of the finest clay, silt, and detrital particles which provide optimum surfaces for trace metal transport.
334 citations
"Accumulation of trace metals in gre..." refers background in this paper
...…mangrove rhizosphere sediments have a large potential to sequester trace metals and assist in protecting coastal marine environments from pollution (Harbison, 1986; Lacerda et al., 1988; Clark et al., 1998), changes in physico-chemical conditions may trigger release of accumulated trace metals to…...
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...…form a unique group of intertidal ecosystems that dominate over large extents of shorelines and estuaries in tropical and subtropical regions (e.g., Harbison, 1986; Lacerda et al., 1988; MacFarlane et al., 2003; Marchand et al., 2011; Wang et al., 2013) protecting coastlines from the devastating…...
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