Trace element storage capacity of sediments in deadPosidonia oceanicamat from a chronically contaminated marine ecosystem
| Autor: | Andrew B. Cundy, Cecilia Doriana Tramati, Rossella Di Leonardo, Antonio Mazzola, Salvatrice Vizzini |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Total organic carbon chemistry.chemical_classification biology Ecology 010604 marine biology & hydrobiology Health Toxicology and Mutagenesis Trace element Sediment 010501 environmental sciences biology.organism_classification 01 natural sciences Dredging chemistry Posidonia oceanica Environmental chemistry Environmental Chemistry Environmental science Organic matter Bioindicator Bay 0105 earth and related environmental sciences |
| Zdroj: | Environmental Toxicology and Chemistry. 36:49-58 |
| ISSN: | 0730-7268 |
| Popis: | Posidonia oceanica mat is considered a long-term bioindicator of contamination. Storage and sequestration of trace elements and organic carbon (Corg) were assessed in dead P. oceanica mat and bare sediments from a highly polluted coastal marine area (Augusta Bay, central Mediterranean). Sediment elemental composition and sources of organic matter have been altered since the 1950s. Dead P. oceanica mat displayed a greater ability to bury and store trace elements and Corg than nearby bare sediments, acting as a long-term contaminant sink over the past 120?yr. Trace elements, probably associated with the mineral fraction, were stabilized and trapped despite die-off of the overlying P. oceanica meadow. Mat deposits registered historic contamination phases well, confirming their role as natural archives for recording trace element trends in marine coastal environments. This sediment typology is enriched with seagrass-derived refractory organic matter, which acts mainly as a diluent of trace elements. Bare sediments showed evidence of inwash of contaminated sediments via reworking; more rapid and irregular sediment accumulation; and, because of the high proportions of labile organic matter, a greater capacity to store trace elements. Through different processes, both sediment typologies represent a repository for chemicals and may pose a risk to the marine ecosystem as a secondary source of contaminants in the case of sediment dredging or erosion. Environ Toxicol Chem 2016;9999:1–10. © 2016 SETAC |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text