Three tropical seagrasses as potential bio-indicators to trace metals in Xincun Bay, Hainan Island, South China
- 205 Downloads
Concentrations of the trace metals Cu, Cd, Pb, and Zn were measured in seawater, rhizosphere sediments, interstitial water, and the tissues of three tropical species of seagrasses (Thalassia hemprichii, Enhalus acoroides and Cymodocea rotundata) from Xincun Bay of Hainan Island, South China. We analyzed different environmental compartments and the highest concentrations of Pb and Zn were found in the interstitial and seawater. The concentrations of Cd and Zn were significantly higher in blades compared with roots or rhizomes in T. hemprichii and E. acoroides, respectively. A metal pollution index (MPI) demonstrated that sediment, interstitial water, and seagrasses in the sites located nearest anthropogenic sources of pollution had the most abundant metal concentrations. There was obvious seasonal variation of these metals in the three seagrasses with higher concentrations of Cu, Pb and Zn in January and Cd in July. Furthermore, the relationships between metal concentrations in seagrasses and environmental compartments were positively correlated significantly. The bioconcentration factors (BCF) demonstrated that Cd from the tissues of the three seagrasses might be absorbed from the sediment by the roots. However, for C. rotundata, Zn is likely to be derived from the seawater through its blades. Therefore, the blades of T. hemprichii, E. acoroides and C. rotundata are potential bio-indicators to Cd content in sediment, and additionally Zn content (C. rotundata only) in seawater.
Keywordmetal contamination seagrass bioaccumulation bio-indicator South China Sea
Unable to display preview. Download preview PDF.
- Alvarez-Legorreta T, Mendoza-Cozatl D, Moreno-Sanchez R, Gold-Bouchot G. 2008. Thiol peptides induction in the seagrass Thalassia testudinum (Banks ex König) in response to cadmium exposure. Aquat. Bot., 86:12–19.Google Scholar
- Calmano W, Ahlf W, Forstner U. 1996. Sediment quality assessment: chemical and biological approaches. In: Calmano W, Forstner U eds. Sediments and Toxic Substances. Springer, Berlin. p.1–35.Google Scholar
- Dawes C J, Phillips R C, Morrison G. 2004. Seagrass communities of the gulf coast of florida: status and ecology. Florida Fish and Wildlife Conservation Commission Fish and Wildlife Research Institute, and the Tampa Bay Estuary Program, St. Petersburg, Florida.Google Scholar
- den Hartog C. 1970. The Sea-Grasses of the World. North-Holland, Amsterdam.Google Scholar
- Green E P, Short F T. 2003. World Atlas of Seagrass. University of California Press, Berkeley.Google Scholar
- Lafabrie C, Pergent G, Pergent-Martini C. 2009. Utilization of the seagrass Posidonia oceanica to evaluate the spatial dispersion of metal contamination. Sci. Total Environ., 407: 2 440–2 446.Google Scholar
- Pulich W M. 1980. Heavy metal accumulation by selected Halodule wrightii Asch. populations in the Corpus Christi Bay area. Contrib. Mar. Sci. Univ. Tex., 23: 89–100.Google Scholar
- Thangaradjou T, Nobi E P, Dilipan E, Sivakumar K, Susila S. 2010. Heavy metal enrichment in seagrasses of Andaman Islands and its implication to the health of the coastal ecosystem. Indian J. Mar. Sci., 39: 85–91.Google Scholar
- Virnstein R W. 1987. Seagrass-associated invertebrate communities of the southeastern USA: a review. In: Durako M J, Phillips R C, Lewis R R eds. Proceedings of the Symposium on Subtropical—Tropical Seagrasses of the Southeastern United States. Florida Department of Natural Resources, Florida Marine Research Publications, Tallahassee. p.89–116.Google Scholar
- Waycott M, Duarte C M, Carruthers T J B, Orth R J, Dennison W C, Olyarnik S, Calladine A, Fourqurean J W, HeckJr K L, Hughes A R, Kendrick G A, Kenworthy W J, Short F T, Williams S L. 2009. Accelerating loss of seagrasses across the globe threatens coastal ecosystems. Proc. Natl. Acad. Sci., 106: 12 377–12 381.CrossRefGoogle Scholar