| seasonal variation of zn, pb, cu and cd concentrations in the root-sediment system of spartina maritima and halimione portulacoides from tagus estuary salt marshes. | concentrations of zn, pb, cu and cd have been determined in leaves, stems and roots of spartina maritima and halimione portulacoides from the tagus estuary salt mash (corroios) and in the sediments between their roots. biological materials and sediments were sampled every 2 months, between july 1991 and july 1992. root biomass increased from july to september and from january to march. the greatest metal concentrations occurred in the roots, with lowest levels in january and increasing levels du ... | 2000 | 11285730 |
| activity and growth efficiency of heterotrophic bacteria in a salt marsh (ria de aveiro, portugal). | bacterial utilization of monomers is recognized as an important step in the biogeochemical cycling of organic matter. in this study we have compared the heterotrophic activity of bacterial communities from different micro-habitats within a salt marsh environment (ria de aveiro, portugal) in order to establish spatial patterns of bacterial abundance, monomer turnover rates (tr) and bacterial growth efficiency (bge). differences in bacterial abundance and activity could be found between distinct p ... | 2005 | 16035240 |
| responses of halophytes to high salinities and low water potentials. | the effects of nonsaline polyethylene glycol (peg)-6000 and saline seawater solutions of comparable osmotic potential on the concentrations of organic solutes and inorganic ions in the tissues of halophytes (plantago maritima l., triglochin maritima l., limonium vulgare mill., halimione portulacoides (l.) aell) have been investigated. studies were made to determine whether high salinities induce specific ion effects that are absent in plants grown in nonsaline solutions of comparable osmotic pot ... | 1979 | 16661119 |
| halophyte vegetation influences in salt marsh retention capacity for heavy metals. | we analysed concentrations of cu, cd and pb in above and belowground tissues of the halophyte species halimione portulacoides and spartina maritima, as well as in sediments and pore water between the roots in a tagus estuary salt marsh (portugal). from these results we calculated the pools of metals in the compartments mentioned above. relative percentages of accumulation in each pool were also determined. our aim was to determine how the type of vegetation in the salt marsh affects overall meta ... | 2007 | 16996176 |
| decomposition of belowground litter and metal dynamics in salt marshes (tagus estuary, portugal). | the concentrations of c, fe, mn, zn, cu, pb and cd were determined monthly in decomposing roots of halimione portulacoides, using litterbag experiments, in two salt marshes of the tagus estuary with different levels of contamination. although carbon concentrations varied within a narrow interval during the experiment, litter decomposed rapidly in the first month (weight loss between 0.051 and 0.065 g d(-1)). the time variation of metals was examined in terms of me/c ratios and metal stocks. rati ... | 2007 | 17316771 |
| mercury mobility in a salt marsh colonised by halimione portulacoides. | the present study intends to increase the knowledge on the mobility of mercury in a salt marsh colonised by halimione portulacoides. mercury distribution in the sediment layers and its incorporation into the plant biomass were assessed, as well as the potential export of mercury from the contaminated area to the adjacent environment. mercury pools in the sediments ranged from 560 to 943 mg m(-2) and are largely associated with the solid fraction, with just a small amount being associated with th ... | 2008 | 18555514 |
| influence of a salt marsh plant (halimione portulacoides) on the concentrations and potential mobility of metals in sediments. | influence of halimione portulacoides, commonly found in temperate salt marshes, on sediment metal contents, speciation and potential mobility in case of sediment re-suspension was evaluated. both colonized and non-colonized sediments were studied for total cd, cu, pb and zn contents and metal fraction exchangeable to water collected in situ. sediment elutriates, prepared with water collected from each site, were used to simulate a sediment re-suspension phenomenon. as the characteristics and deg ... | 2008 | 18606437 |
| contribution of primary producers to mercury trophic transfer in estuarine ecosystems: possible effects of eutrophication. | there is an ongoing eutrophication process in the ria de aveiro coastal lagoon (portugal), with progressive replacement of rooted primary producers for macroalgae. taking advantage of a well-defined environmental contamination gradient, we studied mercury accumulation and distribution in the aboveground and the belowground biomass of several salt marsh plants, including the seagrass species zostera noltii and the dominant green macroalgal species enteromorpha sp. the results of these experiments ... | 2009 | 19062048 |
| accumulation and biological cycling of heavy metal in four salt marsh species, from tagus estuary (portugal). | pools of zn, cu, cd and co in leaf, stem and root tissues of sarcocornia fruticosa, sarcocornia perennis, halimione portulacoides and spartina maritima were analyzed on a bimonthly basis, in a tagus estuary salt marsh. all the major concentrations were found in the root tissues, being the concentrations in the aboveground organs neglectable for sediment budget proposes, as seen by the low root-aboveground translocation. metal annual accumulation, root turnovers and cycling coefficients were also ... | 2010 | 20036450 |
| water-soluble fraction of mercury, arsenic and other potentially toxic elements in highly contaminated sediments and soils. | the water-soluble contents of mercury, arsenic and other potentially toxic elements in highly contaminated sediment and soil samples from portugal were determined. mercury and arsenic concentrations were detectable and reproducible among replicate experiments. despite the acidic ph, the low organic carbon content and the exceptionally high levels of contamination of certain samples (total mercury contents varied between 0.15 and 3180 mg kg(-1) while total arsenic concentrations ranged from 11 to ... | 2010 | 20122712 |
| ability of salt marsh plants for tbt remediation in sediments. | the capability of halimione portulacoides, spartina maritima, and sarcocornia fruticosa (halophytes very commonly found in salt marshes from mediterranean areas) for enhancing remediation of tributyltin (tbt) from estuarine sediments was investigated, using different experimental conditions. | 2010 | 20217262 |
| effects of monospecific banks of salt marsh vegetation on sediment bacterial communities. | the aim of this study was to understand if two species of salt marsh plants, widely distributed in european estuaries (spartina maritima and halimione portulacoides) differently influence the distribution, activity, and metabolic physiology of sediment bacterial communities in monospecific banks, in comparison with uncolonized sediment (control). microbiological descriptors of abundance and activity were assessed along vertical profiles of sediments. rates of activity of the extracellular enzyme ... | 2010 | 20495797 |
| microbacterium proteolyticum sp. nov. isolated from roots of halimione portulacoides. | an endophytic actinobacterial strain rz36t, isolated from roots of the salt-marsh plant halimione portulacoides, was subjected to a polyphasic taxonomic characterization. 16s rrna gene sequence analysis revealed that this strain belonged to the genus microbacterium. the closest phylogenetic relative was microbacterium hominis dsm 12509t, with a pairwise 16s rrna gene sequence similarity of 98.8 %. the dna-dna hybridization value between strain rz36t and m. hominis dsm 12509t was 16 %. the affili ... | 2015 | 25744585 |
| diversity of endophytic pseudomonas in halimione portulacoides from metal(loid)-polluted salt marshes. | phytoremediation assisted by bacteria is seen as a promising alternative to reduce metal contamination in the environment. the main goal of this study was to characterize endophytic pseudomonas isolated from halimione portulacoides, a metal-accumulator plant, in salt marshes contaminated with metal(loid)s. phylogenetic analysis based on 16s rrna and gyrb genes showed that isolates affiliated with p. sabulinigri (n = 16), p. koreensis (n = 10), p. simiae (n = 5), p. seleniipraecipitans (n = 2), p ... | 2016 | 27023813 |
| screening of 18 species for digestate phytodepuration. | this experiment assesses the aptitude of 18 species in treating the digestate liquid fraction (dlf) in a floating wetland treatment system. the pilot system was created in ne italy in 2010 and consists of a surface-flow system with 180 floating elements (tech-ia®) vegetated with ten halophytes and eight other wetland species. the species were transplanted in july 2011 in basins filled with different proportions of dlf/water (dlf/w); periodic increasing of the dlf/w ratio was imposed after transp ... | 2015 | 25005162 |
| effects of the inoculant strain pseudomonas sp. spn31 nah (+) and of 2-methylnaphthalene contamination on the rhizosphere and endosphere bacterial communities of halimione portulacoides. | the aim of this study is to evaluate the effects of the inoculation of the saltmarsh plant (halimione portulacoides) with pseudomonas sp. spn31 nah+ combined with exposure to 2-methylnaphthalene (2-mtn) on the plant rhizosphere and endosphere bacterial communities as well as on plant health. to achieve this goal, microcosm experiments were set up. denaturing gradient gel electrophoresis (dgge) profiles and statistical analysis showed that rhizosphere and endosphere bacterial communities had dist ... | 2017 | 28260118 |
| microbacterium diaminobutyricum sp. nov., isolated from halimione portulacoides, which contains diaminobutyric acid in its cell wall, and emended description of the genus microbacterium. | three actinobacterial strains were isolated from roots of the salt-marsh plant halimione portulacoides collected in ria de aveiro, portugal. molecular typing using enterobacterial repetitive intergenic consensus eric-pcr fingerprinting showed the strains to be highly similar. phylogenetic analyses based on the 16s rrna gene sequence and multilocus sequence analysis (mlsa) using gyrb, rpob, reca and ppk and 16s rrna genes sequences showed that the strains represented a member of the genus microba ... | 2016 | 27498827 |
| microbacterium endophyticum sp. nov. and microbacterium halimionae sp. nov., endophytes isolated from the salt-marsh plant halimione portulacoides and emended description of the genus microbacterium. | fifteen actinobacterial isolates retrieved from the endophytic community of the salt-marsh plant halimione portulacoides were characterised in this study. eric-pcr fingerprinting analysis divided these isolates into two groups represented by strains pa15(t) and pa36(t), respectively. 16s rrna gene sequence analyses showed the isolates belonged to the genus microbacterium, with microbacterium saccharophilum ncimb 14782(t) as the closest phylogenetic relative to which they have pairwise sequence s ... | 2014 | 25239238 |