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Rawson C.A.,University of Technology, Sydney | Rawson C.A.,Curtin University Australia | Lim R.P.,Landcare Research | Tremblay L.A.,CSIRO | And 5 more authors.
Ecotoxicology | Year: 2010

To investigate potential high organisational level impacts of persistent organic pollution in the wetlands in the Sydney Olympic Park (SOP) remediated site, the benthic macroinvertebrate assemblages of seven wetlands within SOP and two off-site reference wetlands were examined. Sediment cores were collected, stained and preserved from each study site and the macroinvertebrates identified to the appropriate taxonomic level (Class, Order, Family, Subfamily). Data were analysed for taxon richness and macroinvertebrate abundance and multivariate techniques were used to identify chemical/physical characteristics of the sediment, which were important influences on the differences in the assemblage between study sites. Macroinvertebrate abundance was highly variable between study sites and taxon richness was low across all sites. Oligochaetes, nematodes, ostracods and chironomids were the most common taxa found and were the most important in influencing differences between the macroinvertebrate assemblages among the study sites. Sediment grain size and chemical characteristics of the sediments (RPAH, RPCB, TCDDeq and heavy metal concentrations) were important in separating the study sites based on taxon richness and abundance. Canonical correspondence analysis separated the macroinvertebrate assemblages at newly two created wetlands from those at other study sites including the urban reference sites. Increased sediment POP contamination (particularly as measured TCDDeq and RDDT concentrations) is a likely contributor in excluding pollution sensitive taxa and, therefore, alterations to benthic macroinvertebrate assemblages. Further, the influence of TOC suggests the significance of catchment inputs in contributing to changes in macroinvertebrate assemblage. The SOP remediation led to the establishment of wetlands with benthic communities representative of those expected in urban wetlands. © Springer Science+Business Media, LLC 2010.

Hong Y.-T.,State Key Laboratory of Environmental Geochemistry | Zeng Y.-P.,State Key Laboratory of Organic Geochemistry | Feng X.-B.,State Key Laboratory of Environmental Geochemistry | Xiao H.-Y.,State Key Laboratory of Environmental Geochemistry | And 9 more authors.
Bulletin of Mineralogy Petrology and Geochemistry | Year: 2012

A great research progress of environmental geochemistry had been achieved during the past decade. Based on the contents of the Symposium on Environmental Geochemistry held in April 2011 in Guangzhou, some of research progresses, problems, and directions of development on several fields of environmental geochemistry, including environmental geochemistry of nitrogen, mercury, non-traditional stable isotopes, organic matter, karst environment, and climate change, are outlined in this paper.

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