Half a century of dynamic coastal change affecting mangrove shorelines of French Guiana. A case study based on remote sensing data analyses and field surveys

Fromard, François; Vega, Cédric; Proisy, Christophe

doi:10.1016/j.margeo.2004.04.018

Cited by 197 publications

(132 citation statements)

References 42 publications

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“…The first two minerals are the least soluble, and may precipitate, so only the next three, NaCl, MgSO 4 and MgCl 2 , are found in excess in the studied groundwater. In a few low altitude areas of this mangrove forest, some small patches remain without vegetation, but retain a white and brown deposit on the surface, and these could be precipitates of these salts.…”

Section: Evaporitesmentioning

confidence: 95%

“…A more complete analysis of some samples was undertaken to determine the anion amount (Cl À and SO 4 2À by highperformance liquid chromatography (HPLC)) and the cation amount (Na þ , K þ , Ca 2þ and Mg 2þ by inductively coupled plasma atomic emission (ICP-AES) spectroscopy). …”

Section: Ion Analysismentioning

confidence: 99%

“…There is also almost no difference in ion content between the shoreline non-evaporated seawater and a sample taken from 20 km offshore. Compared with seawater, groundwater samples taken in the piezometers of the Sinnamary mangrove forest had higher ion concentrations of Na, Mg, Cl and SO 4 , and lower concentrations of K and Ca (Fig. 4).…”

Section: Water Ion Analysismentioning

confidence: 99%

“…2 Since this time, mangrove forest has developed on the moving mud banks, 3 and the formation of these features over time is controlled by the erosiondeposition processes. 4 A succession of four main types of vegetation occurring on these features in the studied area is given in Fig. 1.…”

mentioning

confidence: 99%

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Mangrove trees growing in a very saline condition but not using seawater

Lambs

Muller

Fromard

2008

Rapid Comm Mass Spectrometry

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Mangrove trees, which develop along tropical coasts, are known to use saline water uptake. In French Guiana, the high salinity condition is the result of seawater evaporation on mud banks formed from the Amazon sediment flumes. In the back mangrove a few kilometres inland, groundwater, soil water and the xylem sap uptake in the trees remain highly salty, and only very tolerant plants like Avicennia germinans can flourish, whereas the less salt-tolerant Rhizophora mangle is more difficult to find. Curiously, the same Avicennia trees propagate on the seafront. However, stable isotope ratio mass spectrometry (IRMS) measurements and ion analysis (high-performance liquid chromatography (HPLC) and inductively coupled plasma atomic emission (ICP-AES) spectroscopy reveal that the origin of the water in the back mangrove is not seawater. It is freshwater percolating into the sand bars from the inland marshes and rainwater during the wet season that redissolves a marine evaporite and gives a saline groundwater. The absence of barren saltine areas ('tanne') in French Guiana could be explained by this freshwater inflow, the aquifer being no longer linked with the ocean.

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Section: Evaporitesmentioning

confidence: 95%

Section: Ion Analysismentioning

confidence: 99%

Section: Water Ion Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Mangrove trees growing in a very saline condition but not using seawater

Lambs

Muller

Fromard

2008

Rapid Comm Mass Spectrometry

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“…O aumento do nível médio relativo do mar (NMRM) poderá ser uma das maiores ameaças ao ecossistema manguezal nas próximas gerações (Duke, 2001;Fromard et al, 2004;Duke et al, 2007;Giri et al, 2011;.…”

Section: Introductionunclassified