Trace metal dynamics in soils and plants along intertidal gradients in semi-arid mangroves (New Caledonia)

Bourgeois, Carine; Bisson, Estelle; Alcius, Steevensen; Marchand, Cyril

doi:10.1016/j.marpolbul.2020.111274

Cited by 12 publications

(12 citation statements)

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“…In addition, Xyn11-29 shares high similarity with GH11 enzymes from the Agaricomycetes class, within the Agaricomycotina sub-phylum. In a previous study, the same mangrove sediments showed a predominance of Ascomycota (76.8–94.5% of total ITS) and Basidiomycota (5.3–18.3% of total ITS) [ 3 ]. In addition, the most abundant OFU identified in the same mangrove sediments using DyP as an alternative enzymatic marker was attributed to a fungus belonging to the Agaricomycetes class, in agreement with our present results [ 6 ].…”

Section: Discussionmentioning

confidence: 99%

“…Sediment samples were collected from a mangrove wetland located in Saint Vincent Bay (21°55′58″ S, 166°4′30″ E) on the west coast of New Caledonia. As previously described [ 3 ], sediment samples were collected in three independent 10 m 2 plots (A, B, C) located 50 m apart and defined in Avicennia marina (A) and Rhizophora stylosa (R) pristine areas. Three sediment cores (50 cm deep) were collected in 2016 at low tide with a stainless-steel corer (diameter 8 cm) in each 10 m 2 plot during the wet (March) and dry (November) seasons.…”

Section: Methodsmentioning

confidence: 99%

“…In this hostile environment, mangrove fungi contribute to the degradation of particulate organic matter into dissolved organic matter, including the lignocellulosic biomass [ 2 ]. In New Caledonia, mangrove zonation is typical of the semi-arid climate, with Rhizophora stylosa colonizing the lower intertidal zone and Avicennia marina growing at higher elevation with higher pore-water salinity and lower organic accumulation in sediments [ 3 ]. The fungi abundantly present within these mangroves constitute a very diverse ecological group (~100 to 1000 different taxa depending on the sample, many of them undescribed) characterized by a strong host specificity, the fungal communities associated with A. marina being very different from those associated with R. stylosa [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

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Screening New Xylanase Biocatalysts from the Mangrove Soil Diversity

et al. 2021

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Mangrove sediments from New Caledonia were screened for xylanase sequences. One enzyme was selected and characterized both biochemically and for its industrial potential. Using a specific cDNA amplification method coupled with a MiSeq sequencing approach, the diversity of expressed genes encoding GH11 xylanases was investigated beneath Avicenia marina and Rhizophora stylosa trees during the wet and dry seasons and at two different sediment depths. GH11 xylanase diversity varied more according to tree species and season, than with respect to depth. One complete cDNA was selected (OFU29) and expressed in Pichia pastoris. The corresponding enzyme (called Xyn11-29) was biochemically characterized, revealing an optimal activity at 40–50 °C and at a pH of 5.5. Xyn11-29 was stable for 48 h at 35 °C, with a half-life of 1 h at 40 °C and in the pH range of 5.5–6. Xyn11-29 exhibited a high hydrolysis capacity on destarched wheat bran, with 40% and 16% of xylose and arabinose released after 24 h hydrolysis. Its activity on wheat straw was lower, with a release of 2.8% and 6.9% of xylose and arabinose, respectively. As the protein was isolated from mangrove sediments, the effect of sea salt on its activity was studied and discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Screening New Xylanase Biocatalysts from the Mangrove Soil Diversity

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“…The transfer of TM from mangrove soils to mangrove trees depend on the bioavailability of the TM in the soil as plants can only assimilate TM in the soluble form (Tremel-Schaub and Feix, 2005). Soil factors such as redox potential, pH, and cationic exchange capacity drive TM bioavailability in mangrove soils, and therefore transfer to mangrove trees (Batty, 2000;Bourgeois et al, 2020;Fritioff et al, 2005;Huang X et al, 2020;Marchand et al, 2016;Robin et al, 2021). TM transfer to mangrove plants differs greatly between TM, tissues, and species since it depends on metabolic requirements (He et al, 2014;Marchand et al, 2016;Rezaei et al, 2021;Robin et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…While the human population density is low (17 inhabitants per km 2 ) (Insee, 2020), and the island is relatively pristine, anthropogenic activities still threaten these ecosystems to various degrees. Due to the lateritic nature of one-third of the soil on the island (e.g., rich in oxides and TM) (Tardy and Roquin, 1992), most studies were interested in the impact of mining activities, that increase erosional processes, and lateritic sediments inputs on mangrove forests (Marchand et al, 2016(Marchand et al, , 2012Bourgeois et al, 2020;Robin et al, 2021). Few studies have also considered the impact of aquaculture and its discharge (Marchand et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Distribution and bioaccumulation of trace metals in urban semi-arid mangrove ecosystems

Robin

Marchand

Mathian

et al. 2022

Front. Environ. Sci.

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Mangrove ecosystems are known to act as filters for contaminants between land and sea. In New Caledonia, urbanization has increased along the coastline during the last decades. However, the impact of urbanization on contaminant cycling in mangrove forests has remained unexplored. In this study, we investigated trace metals (TM) dynamics in an urban mangrove soil and their transfer to mangrove tissues for the two dominant mangrove species in New Caledonia: Avicennia marina and Rhizophora stylosa. The results suggest that decades of urban rainwater runoff from an upper neighborhood induced large variations of mangrove soil physico-chemical properties compared to a control mangrove site sharing the same geological watershed. The urban mangrove site had a neutral pH and low salinity in the upper soil, while the control mangrove site presented acidic pH and a salinity ranging from 24 to 62 g L−1. Most TM were significantly less concentrated in the urban mangrove soil varying from 1.3 ± 0.3 μg g−1 at the urban site and 1.9 ± 0.5 μg g−1 at the control site for Cd, to 30 ± 8 mg g−1 and 49 ± 11 mg g−1 for Fe at the urban and control site, respectively. However, higher root bioconcentration factors were measured for As, Cd, Co, Cr, Fe, Mn, Ni, and Pb in the urban mangrove soil (1.7 ± 0.9, 0.14 ± 0.06, 0.23 ± 0.13, 0.042 ± 0.026, 0.088 ± 0.057, 0.47 ± 0.39, 0.21 ± 0.12, and 0.25 ± 0.09, respectively) compared to the control mangrove soil (0.11 ± 0.03, 0.041 ± 0.016, 0.045 ± 0.021, 0.010 ± 0.004, 0.013 ± 0.007, 0.094 ± 0.030, 0.022 ± 0.011, and 0.12 ± 0.03, respectively). The bioavailability of TM in the urban mangrove soil may be favored by suboxic conditions associated to less Cl-TM complexes and pyrite-TM complexes in the soil. Only Cu, Pb, Ti, and Zn, usually associated with urbanization, were more concentrated in the urban mangrove soil with mean concentrations of 27 ± 4, 17 ± 2, 4,571 ± 492, and 62 ± 12 μg g−1 at the urban site, respectively, and 21 ± 4, 10 ± 3, 2,834 ± 541, and 57 ± 12 μg g−1 at the control site, respectively. No significant difference in translocation factors was measured between the two sites, evidencing a regulation of TM translocation to the upper tissues by mangrove trees.

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