2004
DOI: 10.1021/es049932j
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Influence of the Sea Rush Juncus maritimus on Metal Concentration and Speciation in Estuarine Sediment Colonized by the Plant

Abstract: Metal accumulation by Juncus maritimus and the role of this plant on the physical and chemical composition of sediments, from the Douro river estuary (NW Portugal), were investigated. The contents of Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn were determined (by atomic absorption spectrophotometry) in sediments, rhizosediments (those among plant roots and rhizomes), and different plant tissues (roots, rhizomes, leaves, and stems). Metal fractionation in sediments through sequential extraction was carried out and used … Show more

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Cited by 121 publications
(79 citation statements)
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“…Concentrations of Cr in plants vary widely according to tissue type and growth stage, and the pattern of Cr variation appears to be irregular (Mertz et al, 1974;Kabata-Pendias & Pendias, 2001). We found a high translocation of Cr from roots to shoots in both Spartina species, which concurs with various studies demonstrating that roots retain small quantities of Cr (Windham et al, 2003;Almeida et al, 2004). Luque et al (1999) found similar concentrations of Cr in S. densiflora and S. maritima at Odiel marshes.…”
Section: Metal Content and Distribution In Plant Tissuessupporting
confidence: 89%
“…Concentrations of Cr in plants vary widely according to tissue type and growth stage, and the pattern of Cr variation appears to be irregular (Mertz et al, 1974;Kabata-Pendias & Pendias, 2001). We found a high translocation of Cr from roots to shoots in both Spartina species, which concurs with various studies demonstrating that roots retain small quantities of Cr (Windham et al, 2003;Almeida et al, 2004). Luque et al (1999) found similar concentrations of Cr in S. densiflora and S. maritima at Odiel marshes.…”
Section: Metal Content and Distribution In Plant Tissuessupporting
confidence: 89%
“…Higher sedimentation rates in areas colonised by halophytes compared to unvegetated areas are likely to be related to the observed pattern in metal concentration (1 and 0.6 cm year -1 , respectively, at Corroios, according to Caçador et al (2004)). In addition, activity of roots liberates oxygen and organic matter to sediments, and thus it is able to modify characteristics as Eh, pH and microbial activity which will eventually modify metal retention capacity (Williams et al, 1994a;Doyle & Otte, 1997;Kamnev & van der Lelie, 2000;Almeida et al, 2004). Spartina maritima has a well-developed arenchyma and therefore presents the ability to oxidise the rhizosphere, being able to colonise anoxic environments.…”
Section: Discussionmentioning
confidence: 99%
“…Furthermore, speciation of Pb and Zn in sediments colonised by these two species has been found to be different, and such differences might be a result of both the type of colonising species and the location (own unpublished results). Studies made in several estuaries have shown that speciation of metals in salt marsh sediments depends greatly on local factors, such as sediment redox potential or grain size, in addition to metal nature or presence of roots (Allen et al, 1990;Caçador et al, 1996b;Mortimer & Rae, 2000;Otero et al, 2000;Sáenz et al, 2003;Almeida et al, 2004).…”
Section: Introductionmentioning
confidence: 99%
“…Estuaries are often considered sinks for contaminants, receiving important anthropogenic inputs from the upstream catchments and from metropolitan areas and industries located on or near those areas (Almeida et al 2004). Estuaries are dynamic, complex and unique systems that present both seasonal and spatial variability (Chapman and Wong 2001).…”
Section: Introductionmentioning
confidence: 99%