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[active properties and therapeutic effects of san giovanni spa mud (portoferraio, elba island)].the authors describe the most important chemical-physical characteristics of the slime of the terme san giovanni in elba island, both with reference to the inorganic component, and especially to the organic one. the latter principally comes from the presence in the extraction basin of green algae of caulerpa genus and of two sea plants, zoostera marina and posidonia oceanica. the presence of sulphur, in the organic components of slime, and of iron, in the inorganic one, provide the peloid peculi ...19968975182
heavy metals contents in organic amendments based on beached posidonia oceanica. 200011218262
biological invasions as a component of global change in stressed marine ecosystems.biological invasions in marine environment are the lesser known aspect of global change. however, recent events which occurred in the mediterranean sea demonstrate that they represent a serious ecological and economical menace leading to biodiversity loss, ecosystem unbalancing, fishery and tourism impairment. in this paper we review marine bioinvasions using examples taken from the mediterranean/black sea region. particular attention is given to the environmental status of the receiving area as ...200312735951
underwater acoustic positioning systems as tool for posidonia oceanica beds survey.the study of the dynamics of posidonia oceanica beds, and more particularly, the position of their lower limit, are usually carried out by the installation and monitoring of markers set on the sea bottom. acoustic telemetry could constitute an interesting alternative solution to the marking of the lower limit seagrass beds. in order to test the potentialities of this system, an experiment was conducted in the natural marine reserve of cerbère-banyuls (eastern pyrenees, france). the possibility o ...200515714881
first assessment of the caulerpa racemosa (caulerpales, chlorophyta) invasion along the french mediterranean coast.the introduced green alga caulerpa racemosa var. cylindracea has been rapidly spreading in the mediterranean sea since 1990. it was first observed in france in 1997 (marseilles). in early 2004, the stretch of the french mediterranean coastline and the surface area affected by the invasion were estimated at about 83 km and 4014 ha, respectively. the depth range of colonized areas was usually 10-35 m depth. shallow (0-10 m) and deep (down to 40 m) dense meadows were rarely observed. in contrast to ...200515893332
posidonia oceanica as a historical monitor device of lead concentration in marine environment.we show that posidonia oceanica is able to reliably monitor the variability of environmental lead (pb). we analyze lead concentration measured in the scales and rhizomes of posidonia oceanica collected in seven sites along the coasts of the sicily island and subsequently fractioned them according to a lepidochronological analysis. we measure lead concentration in posidonia oceanica tissues by using the flame atomic absorption spectrophotometry technique. we compare the measured lead concentratio ...200515926545
effects of fish farming on flavonoids in posidonia oceanica.this work is a first approach to flavonoid responses (total proanthocyanidins and total and simple flavonols) in posidonia oceanica in function of nutrient enrichment (aquaculture activities - fish farming), in the western mediterranean sea (calvi-corsica-france). the first result is the presence of total and simple flavonoids in p. oceanica. the second result shows an increase in total proanthocyanidin and total flavonol concentrations near cages, which would be linked to the high grazing press ...200616890273
trace metal concentrations in posidonia oceanica of north corsica (northwestern mediterranean sea): use as a biological monitor?within semi-closed areas like the mediterranean sea, anthropic wastes tend to concentrate in the environment. metals, in particular, are known to persist in the environment and can affect human health due to accumulation in the food chain. the seagrass posidonia oceanica, widely found in mediterranean coastal waters, has been chosen as a "sentinel" to quantify the distribution of such pollutants within the marine environment. using a technique similar to dendrochronology in trees, it can act as ...200616965615
ecological data in integrated coastal zone management: case study of posidonia oceanica meadows along the corsican coastline (mediterranean sea).integrated coastal zone management (iczm) contributes towards maximizing the benefits provided by the coastal zone and minimizing conflicts and the harmful effects of activities upon each other. the coastal zone includes highly productive and biologically diverse ecosystems, but ecological data (including structure and processes) seem to be neglected. the purpose of this article is to present a case study of posidonia oceanica meadows (seagrass beds) along the corsican coastline (mediterranean s ...200617001505
a multivariate index based on the seagrass posidonia oceanica (pomi) to assess ecological status of coastal waters under the water framework directive (wfd).we propose here a multivariate index based on structural and functional attributes of the posidonia oceanica ecosystem (posidonia oceanica multivariate index: pomi) to assess the ecological status of coastal waters following wfd requirements. pomi is based on the combination, through principal component analysis, of physiological, morphological, structural and community level seagrass descriptors (or metrics), univocally related to environmental quality. scores on the first axis are normalised t ...200717045301
posidonia oceanica: a tracer of past mercury contamination.the aim of this study is to assess the relevance and the potential of posidonia oceanica as a tracer of past mercury contamination. shoots were collected on two sites, an impacted site, rosignano (tuscany, italy), and a pristine site, tonnara (corsica, france). lepidochronology was used to measure mercury concentrations in living sheaths and in the corresponding dead sheaths. the results show that there is an overestimation of mercury concentrations in dead sheaths (because of the degradation of ...200717240020
sediment characteristics and macrofauna distribution along a human-modified inlet in the gulf of oristano (sardinia, italy).we studied the spatial variability and within-year temporal changes in hydrological features, grain size composition and chemical characteristics of sediments, as well as macrofaunal assemblages, along a heavily modified inlet in the gulf of oristano (western sardinia, italy). the inlet connects the cabras lagoon to the gulf through a series of convoluted creeks and man-made structures, including a dam and fish barriers built in the last three decades. sediments were muddy and mainly composed of ...200717335856
trace metals assessment in water, sediment, mussel and seagrass species--validation of the use of posidonia oceanica as a metal biomonitor.the accumulation of trace metals (cd, co, cr, hg, ni and pb) was measured in water, sediment, the mussel mytilus galloprovincialis and the seagrass posidonia oceanica. samples were collected in three locations of the north-western mediterranean (canari, livorno and porto-torres) which present different levels and sources of human impact. analyses in the different compartments (water, sediment, m. galloprovincialis and p. oceanica) have allowed to identify canari as the most cd, co, cr and ni con ...200717420038
metal contamination of posidonia oceanica meadows along the corsican coastline (mediterranean).the aim of this study is to determine metal (cd, co, cr, hg, ni, pb) concentrations in posidonia oceanica tissues along the corsican coastline. the results show that except for cr, all the metals are preferentially accumulated in the blades; this is particularly interesting as it means that future metal analyses may be carried out only on the blades avoiding thus the removal of the shoots. moreover, they show that metal concentrations may reflect the "background noise" of the mediterranean sea. ...200817428593
spectrum of genetic diversity and networks of clonal organisms.clonal reproduction characterizes a wide range of species including clonal plants in terrestrial and aquatic ecosystems, and clonal microbes such as bacteria and parasitic protozoa, with a key role in human health and ecosystem processes. clonal organisms present a particular challenge in population genetics because, in addition to the possible existence of replicates of the same genotype in a given sample, some of the hypotheses and concepts underlying classical population genetics models are i ...200717472906
phenols content and 2-d electrophoresis protein pattern: a promising tool to monitor posidonia meadows health state.the endemic seagrass posidonia oceanica (l.) delile colonizes soft bottoms producing highly productive meadows that play a crucial role in coastal ecosystems dynamics. human activities and natural events are responsible for a widespread meadows regression; to date the identification of "diagnostic" tools to monitor conservation status is a critical issue. in this study the feasibility of a novel tool to evaluate ecological impacts on posidonia meadows has been tested. quantification of a putativ ...200717663776
evaluation of antidiabetic, antioxidant and vasoprotective effects of posidonia oceanica extract.the aim of this study is to evaluate antidiabetic, antioxidant and vasoprotective effects of posidonia oceanica extract (poe) in alloxan diabetic rats. posidonia oceanica (l) delile (posidoniaceae), is a widely allocated phanerogam in mediterranean and aegean sea. up to date, no published data relevant to use of the plant in traditional medicine are available. however, decoction of the leaves has been quoted to be used as a remedy for diabetes mellitus and hypertension by villagers living by the ...200817977678
physiological responses of the seagrass posidonia oceanica as indicators of fish farm impact.the development of aquaculture along the mediterranean coastline degrades the marine environment, in particular posidonia oceanica meadows, which, in extreme cases, show high mortality. here we studied the effects of organic matter and nutrient input from the effluents of three fish farms, located along the mediterranean coast, on p. oceanica physiology. for this purpose, we measured physiological variables such as total nitrogen (n) content, free amino acid (faa) concentration and composition, ...200818334257
network analysis identifies weak and strong links in a metapopulation system.the identification of key populations shaping the structure and connectivity of metapopulation systems is a major challenge in population ecology. the use of molecular markers in the theoretical framework of population genetics has allowed great advances in this field, but the prime question of quantifying the role of each population in the system remains unresolved. furthermore, the use and interpretation of classical methods are still bounded by the need for a priori information and underlying ...200819022909
utilization of the seagrass posidonia oceanica to evaluate the spatial dispersion of metal contamination.metal concentrations have been measured in blades of the endemic mediterranean seagrass posidonia oceanica, along transects from three different contaminant point sources (the former asbestos mine of canari - corsica, france; the chemical plant of solvay/rosignano - livorno, italy; and the industrial harbour of porto-torres - sardinia, italy). the aim of this study was to evaluate the spatial extent of the impact of these sources in terms of metal contamination. the results showed that metal con ...200919081604
assessment of the ecological status of mediterranean french coastal waters as required by the water framework directive using the posidonia oceanica rapid easy index: prei.this paper describes the prei (posidonia oceanica rapid easy index), a method used to assess the ecological status of seawater along mediterranean french coasts. the prei was drawn up according to the requirements of the water framework directive (wfd 2000/60/ec) and was tested on 24 and 18 stations in paca (provence-alpes-côtes d'azur) and corsica, respectively. the prei is based on five metrics: shoot density, shoot leaf surface area, e/l ratio (epiphytic biomass/leaf biomass), depth of lower ...200919700176
226ra activity in the mullet species liza aurata and south adriatic sea marine.(226)ra activity in the south adriatic sea-water, surface sediment, mud with detritus, seagrass (posidonia oceanica) samples and the mullet (mugilidae) species liza aurata, as well as soil and sand from the montenegrin coast-was measured using the six-crystal gamma-coincidence spectrometer pripyat-2m. the results are used for calculation of the absorbed (and annual effective) dose rates in air due to the (226)ra gamma radiation. the absorbed dose rates ranged from 5.94 to 97.16 ngy h(-1) (soil) ...201020403816
variability in the structure of epiphytic assemblages of posidonia oceanica in relation to human interferences in the gulf of gabes, tunisia.in this study we evaluate whether the pattern of spatial variability of the macro-epiphyte assemblages of leaves of posidonia oceanica differed in relation to anthropogenic interference in the gulf of gabes (southern coast of tunisia). a hierarchical sampling design was used to compare epiphytic assemblages at 5 m depth in terms of abundance and spatial variability at disturbed and control locations. the results indicate that the biomass and mean percentage cover decreased at locations near the ...201020851462
exploring the utility of posidonia oceanica chlorophyll fluorescence as an indicator of water quality within the european water framework directive.the european water framework directive commits partner countries to evolve uniform protocols for monitoring the environmental condition of natural water bodies, crucially integrating biological and ecological criteria from the associated ecosystems. this has encouraged considerable research on the development of bioindicator-based systems of water quality monitoring. a critical step towards this end is providing evidence that the proposed bioindicator system adequately reflects the human pressur ...201121785841
a novel methylated sesquiterpene from seagrass posidonia oceanica (l.) delile.phytochemical investigation of chloroform extract from the leaves of the marine plant posidonia oceanica (l.) delile (posidoniaceae), yielded posidozinol, a new methylated sesquiterpene along with β-sitosterol and four known fatty acids: palmitic, palmitoleic, oleic and linoleic acids. the structure elucidation has been established on the basis of 1d- and 2d-nmr spectroscopy, gs/ms and es mass spectrometry. antibacterial effects of crude extracts from p. oceanica were evaluated against: pseudomo ...201322978670
description of five new marinomonas species from the microbiota of the seagrass posidonia oceanica.gram negative aerobic marine bacteria with dna g+c content below 50 mol% were isolated from the seagrass posidonia oceanica. 16s rrna sequence analysis indicated that they belong to the genus marinomonas. major fatty acid composition (c(10:0) 3-0h, c(16:0) , c(16:1)ω7c and c(18:1)ω7c) supported the affiliation of these strains to the genus marinomonas. ivia-po-14b(t), ivia-po-145(t) and ivia-po-155(t) were phylogenetically related to m. pontica 46-16(t), according to phylogenetic analysis. howev ...201020935088
regulation of the marinomonas mediterranea antimicrobial protein lysine oxidase by l-lysine and the sensor histidine kinase ppos.some gram-negative bacteria express a novel enzyme with lysine-epsilon-oxidase (lod) activity (ec 1.4.3.20). the oxidation of l-lys generates, among other products, hydrogen peroxide, which confers antimicrobial properties to this kind of enzyme and has been shown to be involved in cell death during biofilm development and differentiation. in addition to lod, the melanogenic marine bacterium marinomonas mediterranea, which forms part of the microbiota of the marine plant posidonia oceanica, expr ...201020656878
remote influence of off-shore fish farm waste on mediterranean seagrass (posidonia oceanica) meadows.the aim of this study was estimating the remote influence of waste dispersed from a large off-shore fish farm complex (6197 ton year(-1)) on the near-shore posidonia oceanica meadow (26-27 m deep) located at a distance of 3 km. measurements of isotopic nitrogen content in epiphytes and seagrass leaf tissues, epiphyte biomass, shoot size, herbivory pressure, shoot density and seagrass meadow cover, performed in this meadow (fa area) were compared with those obtained in an undisturbed control mead ...201019846214
first results on the study of metal contamination along the corsican coastline using posidonia oceanica.this study aims at determining the metal concentrations in blades and sheaths of posidonia oceanica adult leaves, in 16 stations of the corsican coastline. it shows that except for cr, all the metals are preferentially accumulated in the blades. this result is particularly interesting as it means that trace metals analyses may be carried out only on the blades avoiding thus the removal of the shoots. moreover, this study shows that metal concentrations generally fall within the range of the lowe ...200818035378
urban seagrass: status of posidonia oceanica facing the genoa city waterfront (italy) and implications for management.a system of five adjacent posidonia oceanica meadows facing the waterfront of genoa city (ligurian sea, nw mediterranean) was investigated over different spatial scales (meters-kilometers) using three environmental indices: conservation index (ci), substitution index (si) and phase-shift index (psi). ci revealed differences mostly at large spatial scale, distinguishing the poor condition of the meadows closest to genoa centre and harbour from the comparatively healthy condition of the farthest m ...200717113606
resource translocation within seagrass clones: allometric scaling to plant size and productivity.the allometric scaling of resource demand and translocation within seagrass clones to plant size (i.e. shoot mass and rhizome diameter), shoot production and leaf turnover was examined in situ in eight seagrass species (cymodocea nodosa, cymodocea serrulata, halophila stipulacea, halodule uninervis, posidonia oceanica, thalassodendron ciliatum, thalassia hemprichii and zostera noltii), encompassing most of the size range present in seagrass flora. one fully developed shoot on each experimental r ...200616944245
turkish freshwater and marine macrophyte extracts show in vitro antiprotozoal activity and inhibit fabi, a key enzyme of plasmodium falciparum fatty acid biosynthesis.the ethanolic extracts of a number of turkish freshwater macrophytes (potamogeton perfoliatus, ranunculus tricophyllus and cladophora glomerata) and marine macroalgae (dictyota dichotoma, halopteris scoparia, posidonia oceanica, scinaia furcellata, sargassum natans and ulva lactuca) were assayed for their in vitro antiprotozoal activity. trypanosoma brucei rhodesiense, trypanosoma cruzi, leishmania donovani and plasmodium falciparum were used as test organisms. the cytotoxicity of the extracts w ...200616697632
response of benthic protozoa and thraustochytrid protists to fish farm impact in seagrass (posidonia oceanica) and soft-bottom sediments.we investigated the impact of fish farm biodeposition on benthic bacteria, thraustochytrid protists, and heterotrophic protozoa (nanoflagellates and ciliates) in an oligotrophic area of the mediterranean sea. the fish farm impact was investigated both on a seagrass (posidonia oceanica) bed and on soft bottom sediments. in both systems, sediment samples were collected with a multicontrol sampling strategy (i.e., beneath the fish farm and at three control sites per system). the uneaten food pellet ...200516195830
effects of climate, invasive species and anthropogenic impacts on the growth of the seagrass posidonia oceanica (l.) delile in liguria (nw mediterranean sea).eight shallow water posidonia oceanica meadows were sampled in june 1999 along 300 km of the ligurian coast and were compared through shoot density and lepidochronology. the growth of the seagrass was examined in the light of climate fluctuations and local stresses, colonisation by alien, invasive alga caulerpa taxifolia, and effects of the oil spill from the tanker "haven", and other anthropogenic impacts. both shoot density and lepidochronology pointed to a generalised state of regression of a ...200516115499
posidonia oceanica as a biomonitor of trace elements in the gulf of naples: temporal trends by lepidochronology.levels of hg, cd, pb, cu, zn, fe, and mn were assessed by using posidonia oceanica as a bioindicator in the gulf of naples (southern italy). lepidochronology, which enables retroactive dating of scales and rhizomes of this seagrass, was combined with atomic spectrometry to assess temporal trends of trace elements in dated scales and rhizomes over a 10-year period. lepidochronology occasionally has been used to monitor hg in dated scales, but never has been used to determine concentrations of oth ...200415180358
[molecular characterization of variable tandem repeat sequence determined during rapd analysis among posidonia oceanica insular and coastline populations].the seagrass posidonia oceanica plays a multifunctional role in the coastal area as an important and productive component of ecosystems in the mediterranean sea. we detected by rapd analysis with two arbitrary primers genetic differences in p. oceanica collected from several sites in the southern mediterranean. by amova analysis we observed a level of about 20% genetic difference among individuals within a population and 80% among populations. a common band of 200 bp was found in all the amplifi ...200212138781
effects of fish farm loadings on seagrass (posidonia oceanica) distribution, growth and photosynthesis.the spatial extent and timing of the impact of fish farms on the distribution and performance of a posidonia oceanica meadow were examined in an embayment of the south-eastern coast of spain (hornillo bay, murcia). changes in seagrass distribution were determined using available seagrass mapping (from 1988, i.e., before the onset of aquaculture activities and 1998) and by successive sampling in 1994 and 1998. environmental variables (light attenuation coefficient, water-column dissolved nutrient ...200111585068
distribution and dynamics of posidonia oceanica beds along the albères coastline.the location and dynamics of posidonia oceanica beds were studied in the marine natural reserve of cerbère-banyuls-sur-mer (eastern pyrenees, france), through the mapping of bottom assemblages (transects and image processing) and the monitoring of fixed markers installed at the posidonia oceanica lower limit. the surface area occupied by continuous beds is relatively limited and localized, whereas the presence of important areas of dead 'matter' would seem to indicate that bottom cover by posido ...200010803353
mixed-function oxygenase enzymes as tools for pollution monitoring: field studies on the french coast of the mediterranean sea.1. mfo enzyme activities were measured in microsomes from whole mussels (mytilus galloprovincialis) comber livers (serranus cabrilla), or posidonia oceanica etiolated tissues, and pah contents were determined in sediments collected in coastal locations of the french riviera and corsica during 3 oceanographic cruises in 1987-1988. 2. bap activities in mussel and erod activities measured in fish were strongly correlated to the log of pah content in sediments. the first results for ca4h in posidoni ...19911677868
tracing sewage and natural freshwater input in a northwest mediterranean bay: evidence obtained from isotopic ratios in marine organisms.elemental carbon and nitrogen levels and isotope ratios were assessed in different biological compartments of a northwest (nw) mediterranean bay to trace the various sources of nutrient input from natural (river runoffs) and anthropogenic (harbor outflows, fish farms and urban sewage outfall) sources. samples from transplanted mussels and natural sea grass communities (posidonia oceanica leaves and epiphytes) were harvested from different locations throughout the bay during the touristic summer ...201020171702
anthropogenic chemical cues can alter the swimming behaviour of juvenile stages of a temperate fish.human pressure on coastal areas is affecting essential ecosystems including fish nursery habitats. among these anthropogenic uses, the seasonal increment in the pressure due to leisure activities such as coastal tourism and yachting is an important environmental stressor in many coastal zones. these pressures may elicit understudied impacts due to, for example, sunscreens or other seasonal pollutants. the island of majorca, northwest mediterranean sea, experiences one of the highest number of to ...201728103523
permanent genetic resources added to molecular ecology resources database 1 december 2012-31 january 2013.this article documents the addition of 268 microsatellite marker loci to the molecular ecology resources database. loci were developed for the following species: alburnoides bipunctatus, chamaerops humilis, chlidonias hybrida, cyperus papyrus, fusarium graminearum, loxigilla barbadensis, macrobrachium rosenbergii, odontesthes bonariensis, pelteobagrus vachelli, posidonia oceanica, potamotrygon motoro, rhamdia quelen, sarotherodon melanotheron heudelotii, sibiraea angustata, takifugu rubripes, ta ...201323521844
diversity, ecological role and potential biotechnological applications of marine fungi associated to the seagrass posidonia oceanica.the marine environment is characterized by high salinity and exerts a strong selective pressure on the biota, favouring the development of halo-tolerant microorganisms. part of this microbial diversity is made up of fungi, important organisms from ecological and biotechnological points of view. in this study, for the first time, the qualitative and quantitative composition of the mycoflora associated to leaves, rhizomes, roots and matte of the seagrass posidonia oceanica was estimated. a total o ...201323410985
modelling of escherichia coli concentrations in bathing water at microtidal coasts.monitoring of the quality of bathing water in line with the european commission bathing water directive (directive 2006/7/ec) is a significant economic expense for those countries with great lengths of coastline. in this study a numerical model based on finite elements is generated whose objective is partially substituting the microbiological analysis of the quality of coastal bathing waters. according to a study of the concentration of escherichia coli in 299 spanish mediterranean beaches, it w ...201728346898
characterization and expression of dna sequences encoding putative type-ii metallothioneins in the seagrass posidonia oceanica.posidonia oceanica is a marine phanerogam, largely widespread in the mediterranean sea, representing an important food substrate for many marine organisms. a progressive reduction of p. oceanica meadows has been reported, due to anthropogenic coastal activity. studying mechanisms by which this species responds to environmental stresses, three dna sequences putatively encoding metallothioneins (mts) have been isolated, by pcr. two sequences, pomt2a (accession no. aj249603) and pomt2b (accession n ...200010938373
complete genome sequence of marinomonas posidonica type strain (ivia-po-181(t)).marinomonas posidonica ivia-po-181(t) lucas-elío et al. 2011 belongs to the family oceanospirillaceae within the phylum proteobacteria. different species of the genus marinomonas can be readily isolated from the seagrass posidonia oceanica. m. posidonica is among the most abundant species of the genus detected in the cultured microbiota of p. oceanica, suggesting a close relationship with this plant, which has a great ecological value in the mediterranean sea, covering an estimated surface of 38 ...201223458837
diel activity and variability in habitat use of white sea bream in a temperate marine protected area.fish populations are often comprised of individuals that use habitats and associated resources in different ways. we placed sonic transmitters in, and tracked movements of, white sea bream (diplodus sargus sargus) in the no-take zone of a mediterranean marine protected area: the torre guaceto marine protected area, (adriatic sea, italy). tagged fish displayed three types of diel activity patterns in three different habitats: sand, rocky reefs and "matte" of the seagrass posidonia oceanica. indiv ...201626922044
evaluation of cytotoxic compounds in different organs of the sea bream sarpa salpa as related to phytoplankton consumption: an in vitro study in human liver cell lines hepg2 and wrl68.the present study was aimed to assess the cytotoxic effects of not-yet identified compounds present in organ extracts of sarpa salpa, collected in autumn, the period with a peak in health problems. in addition, we studied the cytotoxicity of extracts of epiphytes found in the stomach content of s. salpa collected in summer and of epiphytes collected from the sea in the sfax area at the end of spring. we tested these fractions in two human hepatic cell lines: hepg2 and wrl68. we observed a signif ...201222821630
an evaluation of a macroalgal bioassay tool for assessing the spatial extent of nutrient release from offshore fish farms.in this study we develop and evaluate a macroalgal bioassay tool for monitoring the spatial extent of dissolved wastes loaded from offshore fish farms into the marine coastal ecosystem. this tool is based on the analysis of the nitrogen stable isotope ratio (delta(15)n) in tissues of several benthic primary producers (macroalgae and posidonia oceanica epiphytes) incubated, by means of incubation devices, in the water column at increasing distances (from 0 m to 1000 m) from the fish cages. the bi ...201020621769
redox agents regulate ion channel activity in vacuoles from higher plant cells.the ability of redox agents to modulate certain characteristics of voltage- and calcium-activated channels has been recently investigated in a variety of animal cells. we report here the first evidence that redox agents regulate the activation of ion channels in the tonoplast of higher plants. using the patch-clamp technique, we have demonstrated that, in tonoplasts from the leaves of the marine seagrass posidonia oceanica and the root of the sugar beet, a variety of sulphydryl reducing agents, ...19999928987
taxonomic study of marinomonas strains isolated from the seagrass posidonia oceanica, with descriptions of marinomonas balearica sp. nov. and marinomonas pollencensis sp. nov.novel aerobic, gram-negative bacteria with dna g+c contents below 50 mol% were isolated from the culturable microbiota associated with the mediterranean seagrass posidonia oceanica. 16s rrna gene sequence analyses revealed that they belong to the genus marinomonas. strain ivia-po-186 is a strain of the species marinomonas mediterranea, showing 99.77 % 16s rrna gene sequence similarity with the type strain, mmb-1(t), and sharing all phenotypic characteristics studied. this is the first descriptio ...201019648336
benthic input rates predict seagrass (posidonia oceanica) fish farm-induced decline.fish farms represent a growing source of anthropogenic disturbance to benthic communities, and efficient predictors of such impacts are urgently needed. we explored the effects of fish farm benthic organic and nutrient inputs on the population dynamics of a key seagrass species (posidonia oceanica) in four mediterranean deep meadows adjacent to sea bream and sea bass farms. we performed two annual plant censuses on permanent plots at increasing distance from farms and measured benthic sedimentat ...200818511087
diversity, structure and function of fish assemblages associated with posidonia oceanica beds in an area of the eastern mediterranean sea and the role of non-indigenous species.temporal and spatial variation in density, biomass and body size of littoral fish species associated with nearshore posidonia oceanica meadows was studied over an annual cycle in an area of the eastern mediterranean sea. a total of 109,350 littoral fishes were collected, belonging to 34 families and 88 species. density of fishes peaked during the summer due to high numbers of juveniles. season was a significant factor determining density, although number of species and biomass did not show any o ...201021155787
short-term response of the slow growing seagrass posidonia oceanica to simulated anchor impact.experimental evaluations about the impact of anchors of small vessels have previously shown that each anchoring can on average damage up to six shoots of posidonia oceanica, removing small amount of biomass and, at the same time, interrupting continuity among shoots. the aim of the paper was to investigate the response of p. oceanica to different damage intensity at two levels of substrata compactness. three treatments were considered: control (no damage); low damage (simulated anchor damage by ...200717175019
effects of posidonia oceanica beach-cast on germination, growth and nutrient uptake of coastal dune plants.seagrass meadows play an important role in marine ecosystems. a part of seagrass production is also exported to adjacent coastal terrestrial systems, possibly influencing their functioning. in this work we experimentally analyzed the effect of posidonia oceanica beach-cast on plant germination, growth, and nutrient uptake of two plant species (cakile maritima and elymus farctus) that grow on upper beaches and fore dunes along the mediterranean coasts. we compared plants growing in simple sand (c ...201323894678
posidonia oceanica banquettes as a substitute for straw in dairy goat rations: metabolic and productive effects.the marine plant posidonia oceanica (l.) delile can be a source of fibre to increase the efficiency of product costs. the aim of the present study was to assess the productive (milk production and performance) and metabolic (blood metabolites) effects of p. oceanica in the ration of dairy goats as a substitute for straw. posidonia oceanica was used at 225 and 450 g day(-1) per goat in lieu of barley straw.201625678018
lulwoana sp., a dark septate endophyte in roots of posidonia oceanica (l.) delile seagrass.posidonia oceanica is the most common, widespread and important monocotyledon seagrass in the mediterranean basin, and hosts a large biodiversity of species, including microorganisms with key roles in the marine environment. in this study, we ascertain the presence of a fungal endophyte in the roots of p. oceanica growing on different substrata (rock, sand and matte) in two sicilian marine meadows. staining techniques on root fragments and sections, in combination with microscope observations, w ...201525262834
determination of trace metal baseline values in posidonia oceanica, cystoseira sp., and other marine environmental biomonitors: a quality control method for a study in south tyrrhenian coastal areas.in this study, we investigated cd, cr, cu, pb, and zn in the seagrass posidonia oceanica (l.) delile leaves and in the brown algae cystoseira sp. sampled along a 280-km transect in the tyrrhenian sea, from the ustica to linosa islands (sicily, italy) with the aim to determine their control charts (baseline levels). by applying the johnson's (biometrika 36:149-175, 1949) probabilistic method, we determined the metal concentration overlap ranges in a group of five biomonitors. here, we propose the ...201525253055
baseline trace metals in seagrass, algae, and mollusks in a southern tyrrhenian ecosystem (linosa island, sicily).trace elements were analyzed in organisms collected at five sampling stations along coastal areas of linosa island, sicily (southern tyrrhenian sea, italy). concentrations of cd, cr, cu, pb, and zn were measured in posidonia oceanica l. delile tissues, the two brown algae padina pavonica (l.) thivy and cystoseira sp., and the two gastropod mollusks monodonta turbinata born and patella caerulea l. seawater samples were also collected at each site to assess soluble metal concentrations and to gain ...201019458990
variations in the concentration of phenolic compounds in the seagrass posidonia oceanica under conditions of competition.the concentration of phenolic compound was measured in the seagrass posidonia oceanica when interacting with two bryopsidophyceae, caulerpa taxifolia and caulerpa racemosa, between may 1999 and may 2000. these measurements were performed on adult and intermediate leaves and in sheaths of the seagrass. sampling was carried out at three stations subject to increasing levels of interaction with caulerpa. the number of tannin cells was also analysed. five phenolic compounds were identified in p. oce ...200415643707
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