Reconstruction of centennial-scale fluxes of chemical elements in the Australian coastal environment using seagrass archives

Oscar Serrano, Grace Davis, Paul S. Lavery, Carlos M. Duarte, Antonio Martinez-Cortizas, Miguel Angel Mateo, Pere Masqué, Ariane Arias-Ortiz, Mohammad Rozaimi, Gary A. Kendrick

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The study of a Posidonia australis sedimentary archive has provided a record of changes in element concentrations (Al, Fe, Mn, Pb, Zn, Cr, Cd, Co, As, Cu, Ni and S) over the last 3000 years in the Australian marine environment. Human-derived contamination in Oyster Harbor (SW Australia) started ~. 100 years ago (AD ~. 1900) and exponentially increased until present. This appears to be related to European colonization of Australia and the subsequent impact of human activities, namely mining, coal and metal production, and extensive agriculture. Two contamination periods of different magnitude have been identified: Expansion period (EXP, AD ~. 1900-1970) and Establishment period (EST, AD ~. 1970 to present). Enrichments of chemical elements with respect to baseline concentrations (in samples older than ~. 115 cal. years BP) were found for all elements studied in both periods, except for Ni, As and S. The highest enrichment factors were obtained for the EST period (ranging from 1.3-fold increase in Cu to 7.2-fold in Zn concentrations) compared to the EXP period (1.1-fold increase for Cu and Cr to 2.4-fold increase for Pb). Zinc, Pb, Mn and Co concentrations during both periods were 2- to 7-fold higher than baseline levels. This study demonstrates the value of Posidonia mats as long-term archives of element concentrations and trends in coastal ecosystems. We also provide preliminary evidence on the potential for Posidonia meadows to act as significant long-term biogeochemical sinks of chemical elements.
Original languageEnglish (US)
Pages (from-to)883-894
Number of pages12
JournalScience of The Total Environment
StatePublished - Oct 2 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the ECU Faculty Research Grant Scheme, the ECU Early Career Research Grant Scheme, and the CSIRO Flagship Marine & Coastal Carbon Biogeochemical Cluster with funding from the CSIRO Flagship Collaboration Fund. PM was supported by a Gledden Visiting Fellowship and AAO by Obra Social "la Caixa". The authors are grateful to N. MarbA, G. Bastyan and D. Kyrwood for their help in field and/or laboratory tasks, as well as to L. Lopez-Merino and four anonymous reviewers for their comments.


Dive into the research topics of 'Reconstruction of centennial-scale fluxes of chemical elements in the Australian coastal environment using seagrass archives'. Together they form a unique fingerprint.

Cite this