Heavy Metals in Macroalgae from the Rocky Intertidal Coastline and Beach Sands of Morrocoy National Park, Venezuela

A biomonitoring study: Heavy metals in macroalgae from eastern Aegean coastal areas

Freshwater Ulva (Chlorophyta) as a bioaccumulator of selected heavy metals (Cd, Ni and Pb) and alkaline earth metals (Ca and Mg)

Benthic macroalgae as biological indicators of heavy metal pollution in the marine environments: A biomonitoring approach for pollution assessment

Copper, iron, lead, manganese, and zinc contents were determined in various phyla of macroalgae typical of the rocky mesolittoral zone of Cuba and widely distributed in the Caribbean Region. the samples were collected in different zones along the shores of Havana City which are more or less influenced by anthropogenic activities. Differences in metal contents were observed due to seasonal variations and differences between sampling sites. of the analyzed species, only one brown alga, Padina vickersiae is considered as a suitable candidate for the monitoring of metal contamination.

The bio-accumulation of heavy metals in macroalgae poses significant risks to marine ecosystems and human health. In this study, heavy metal distributions of macroalgae and potential health risk assessment in the Mersin inner Bay were determined from macroalgae (Stypopodium schimperi, Padina pavonica, Laurencia obtusa, Dictyota sp., Sargassum vulgare, Jania rubens, Halopithys sp., Osmundea sp., Halopithys incurve, Ulva intestinalis, Entromorpha flexuosa, Ulva linza) samples collected between February and September 2021. The levels of heavy metals were found as 1.24-5.93 g/kg for aluminum, 0.61-5.26 g/kg for iron, 1.17-7.61 mg/kg for cobalt, 0.03-0.21 mg/kg for cadmium, 4.26-43.10 mg/kg for chromium, 0.28-437.52 mg/kg for cupper, 17.90-139.08 mg/kg for manganese, 2.78-79.25 mg/kg for nickel, 0.75-3.49 mg/kg for lead and 1.71-70.34 mg/kg for zinc, respectively. The potential risk assessment of macroalgal species using the calculated total cancer risk (TCR) suggested high carcinogenic risk from the carcinogenic chromium, copper and nickel (TCR>1.00E-04).

Heavy metals in the aquatic environment of the Southern Adriatic Sea, Italy: Macroalgae, sediments and benthic species

Notes on Sea Beach Ecology. Food Sources on Sandy Beaches and Localized Diatom Blooms Bordering Gulf Beaches

Studies of heavy metal (copper, lead, zinc and iron) in two species of red macroalgae Gracilariopsis carolinensis Liao and Hommersand and Hypnea musciformis (Wulfen) Lamouroux were carried out to monitor the level of bioavailable metals in coastal areas. The macroalgae and hydrological data were sampled in two areas, at the north and south littoral of Pernambuco (Brazil). The metal concentrations were measured by Atomic Emission Spectrophotometer with Inductive Coupled Plasma. Water temperature ranged from 28 to 31C, salinity from 26.4 to 36.9 UPS and dissolved oxygen from 2.43 to 6.37 mL.L. Higher metal concentrations were detected in the south coast, where Hypnea musciformis presented greater retention capacity. A Principal Components Analysis was performed and explained 50.45% of the total data variability. Rainfall presented an important role in the algae metal content. The median metal concentrations of G. carolinensis in the North area were: iron 141 g.g, lead 3.50 g.g, copper 0.95 g.g and zinc 33.14 g.g; in the South area: iron 347 g.g, lead 2.99 g.g, copper 1.57 g.g and zinc 28.57 g.g; and to H. musciformis in the North area: iron 675 g.g, lead 8.90 g.g, copper 1.85 g.g and zinc 49.93 g.g; in the South area: iron 806 g.g, lead 5.49 g.g, copper 2.35 g.g and zinc 44.57 g.g. No significant (p<0.05) seasonal changes in metal concentration and no distribution pattern were observed in the studied area.

We studied the use of two genera of green macroalgae, Ulva and Enteromorpha, as indicators of heavy metal contamination on the northwest coast of Spain. We evaluated the extent of external contamination by fine particles adhering to the algal thallus and found that although not a problem in Ulva, it may be in Enteromorpha samples. The mean levels of metals in both seaweeds were in accordance with previously reported levels in different species of the genera in clean areas. A large number of significant correlations between levels of metals in macroalgae and in sediment (for both the total and labile fractions) were found. However, almost all of the coefficients of correlation decreased after geochemical normalization of sediment metal concentrations.

Peculiarities of migration and accumulation of heavy metals in the system «ground-plant» by the example of the National natural park «Beloberezhye Svyatoslava»

Crates and small canoes along the rocky beach - Nunavut (NWT)-1496

Large group of dogs on rocky beach - Nunavut (NWT)-1511

The present study was designed to detect the effect of heavy metals in two zones of the Metropolitan Area of Mexico City (MAMC), the Centro de Ciencias de la Atmósfera (CCA), and the Altzomoni station in the Iztaccíhuatl-Popocatépetl National Park. Taraxacum officinale was selected as the indicator organism of responses to atmospheric contamination by heavy metals. Determinations of heavy metals were performed, and total mRNA was extracted to quantify the expression of microRNA398 (miR398), superoxide dismutase 2 (CSD2), and the amounts of free radicals using the bromide of 3-(4,5-dimethylthiazole-2-ilo)-2,5-diphenyltetrazole (MTT) salts reduction assay. Results from the Altzomoni station showed high concentrations of five heavy metals, especially Aluminum, while three heavy metals were identified in the CCA-UNAM zone, most importantly, Vanadium, both in the dry season; miR398 expression presented subtle changes but was greater in the leaves from the stations with higher concentrations of heavy metals. Observations included a significant expression of CSD2, mainly in the dry season in both study zones, where levels were significant with respect to controls (p < 0.05). Reduced MTT was also higher in the dry season than in the rainy season (p < 0.05). In conclusion, the increase in heavy metals on the leaves of Taraxacum officinale induces increased expression of the CSD2 gene and reduced MTT; thus, they can be used as indicators for biomonitoring heavy metal concentrations.

Heavy metals removal by sand filters inoculated with metal sorbing and precipitating bacteria

The paper presents results of screening analysis of all Polish national parks (23) contamination with Cd, Cu, Pb and Zn on the basis of a three-level characteristic of heavy metal presence in Norway spruce stands: accumulation on the needle surface, concentration of heavy metals in spruce needles and concentration of bioavailable heavy metals in the soil. Based on the obtained results, the classification of forest ecosystem hazard in national parks with heavy metals was made using synthetic indicators. It was found out that Babiogórski, Magurski, Ojcowski and Gorczański National Parks, located in the southern part of the country, were the most polluted with heavy metals. It is probably due to a higher industrial activity in this part of Poland and the transboundary transport of air pollutants. A little lower level of pollution was observed in Kampinoski National Park located in the middle of the country. The concentration of heavy metals found in needles from national parks does not seem to be harmful for the health status of the trees. Statistically significant correlation between all parameters, which was found for cadmium--the most mobile of the analysed elements--shows that this metal can be proposed as a marker to reflect present effect of industrial emission on forests.