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Life-cycle phases of a zinc- and cadmium-resistant ecotype of Silene vulgaris in risk assessment of polymetallic mine soils
2000
Ernst, W.H.O. | Nelissen, H.J.M.
Spatial and temporal distribution of toxic compounds in sediments and potential ecological effects on macrobenthic faunal species in Hangzhou Bay from 2003 to 2015
2021
Bao, Cong | Huang, Bei | Shao, Junbo | Cai, Qiang | Mu, Qinglin | Murk, A.J.
The development of toxic compounds in sediment and macrobenthos species in Hangzhou bay (2003–2015) was evaluated. Concentrations were compared to Chinese sediment quality guidelines (CN-SQG) and risk assessed by the ecological risk index (ERI) and t-Distributed Stochastic Neighbour Embedding (t-SNE). To study seafood contamination, sediment and swimming crabs were collected. Chromium, copper, and arsenic exceeded CN-SQG. Organic contaminants did not exceed CN-SQG; however, t-SNE revealed a negative relationship with benthic species numbers. Since 2003, half of the benthic species have disappeared. Species sensitive to contamination were not observed after 2003–2007, while crustacea species are more tolerant: cadmium levels in crabs were 5–17 times those in the sediment, demonstrating strong bioaccumulation. These results suggest that metals and organic pollutants pose ecological and seafood risks. For good environmental management in HZB, it is important to analyze sediment, benthic biota, and seafood species for compounds known to pose toxic risks.
Mostrar más [+] Menos [-]Spatial and temporal distribution of toxic compounds in sediments and potential ecological effects on macrobenthic faunal species in Hangzhou Bay from 2003 to 2015
2021
Bao, Cong | Huang, Bei | Shao, Junbo | Cai, Qiang | Mu, Qinglin | Murk, A.J.
The development of toxic compounds in sediment and macrobenthos species in Hangzhou bay (2003–2015) was evaluated. Concentrations were compared to Chinese sediment quality guidelines (CN-SQG) and risk assessed by the ecological risk index (ERI) and t-Distributed Stochastic Neighbour Embedding (t-SNE). To study seafood contamination, sediment and swimming crabs were collected. Chromium, copper, and arsenic exceeded CN-SQG. Organic contaminants did not exceed CN-SQG; however, t-SNE revealed a negative relationship with benthic species numbers. Since 2003, half of the benthic species have disappeared. Species sensitive to contamination were not observed after 2003–2007, while crustacea species are more tolerant: cadmium levels in crabs were 5–17 times those in the sediment, demonstrating strong bioaccumulation. These results suggest that metals and organic pollutants pose ecological and seafood risks. For good environmental management in HZB, it is important to analyze sediment, benthic biota, and seafood species for compounds known to pose toxic risks.
Mostrar más [+] Menos [-]Impacts of microplastics and heavy metals on the earthworm Eisenia fetida and on soil organic carbon, nitrogen, and phosphorus
2023
Mai, Huong | Thien, Nguyen Danh | Dung, Nguyen Thuy | Valentin, Christian
Microplastics (MPs) are increasingly being studied because they have become ubiquitous in aquatic and terrestrial environments. However, little is known about the negative effects of co-contamination by polypropylene microplastic (PP MPs) and heavy metal mixtures on terrestrial environment and biota. This study assessed the adverse effects of co-exposure to PP MPs and heavy metal mixture (Cu2+, Cr6+, and Zn2+) on soil quality and the earthworm Eisenia fetida. Soil samples were collected in the Dong Cao catchment, near Hanoi, Vietnam, and analyzed for changes in extracellular enzyme activity and carbon, nitrogen, and phosphorus availability in the soil. We determined the survival rate of earthworms Eisenia fetida that had ingested MPs and two doses of heavy metals (the environmental level — 1 × — and its double — 2 ×). Earthworm ingestion rates were not significantly impacted by the exposure conditions, but the mortality rate for the 2 × exposure conditions was 100%. Metal-associated PP MPs stimulated the activities of β-glucosidase, β-N-acetyl glucosaminidase, and phosphatase enzymes in soil. Principle component analysis showed that these enzymes were positively correlated with Cu2+ and Cr6+ concentrations, but negatively correlated with microbial activity. Zn2+ showed no correlation with soil extracellular enzyme activity or soil microbial activity. Our results showed that co-exposure of earthworms to MPs and heavy metals had no impact on soil nitrogen and phosphorus but caused a decrease in total soil carbon content, with a possible associated risk of increased CO2 emissions.
Mostrar más [+] Menos [-]Invertebrates in woodlands polluted by heavy metals: an evaluation using canonical correspondence analysis
1998
Read, H.J. (Bristol Univ. (United Kingdom). Dept. of Botany) | Martin, M.H. | Rayner, J.M.V.
Heavy metals in allotment gardens close to an oil refinery in Plock
1997
Mikula, W. (Warsaw Agricultural Univ., Warszawa (Poland). Faculty of Horticulture, Dept. of Environmental Protection) | Indeka, L.
Metal extractability and availability in a soil after heavy application of either nickel or lead in different forms
1997
Nogales, R. (Estacion Experimental del Zaidin CSIC, Granada (Spain).) | Gallardo-Lara, F. | Benitez, E. | Soto, J. | Hervas, D. | Polo, A.
Immunohistochemical localization of metallothionein in plant tissues
1991
Chongpraditnun, P. (Tokyo Univ. (Japan). Dept. of Agricultural Chemistry) | Suzuki, K. | Kawaharada, U. | Nakajima, K. | Chino, M.
Heavy metal contamination of the marine biota along the Rio de Janeiro coast, SE-Brazil
1991
Carvalho, C.E.V. (Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Geoquimica) | Lacerda, L.D. | Gomes, M.P.
Heavy metals in fish from a series of metal-contaminated lakes near Sudbury, Ontario
1985
Bradley, R.W. (Guelph Univ., Ontario (Canada). Dept. of Zoology) | Morris, J.R.