Impacts of gold mine waste disposal on a tropical pelagic ecosystem.
We used a comparative approach to investigate the impact of the disposal of gold mine tailings into the ocean near the Lihir mine (Niolam Island, Papua New Guinea). We found abundance and diversity of zooplankton, micronekton and pelagic fish to be similar or higher in the mine region compared to the reference site. We also found relatively high trace metal concentrations in lower trophic level groups, especially zooplankton, near the mine discharge, but few differences in tissue concentrations of micronekton, baitfish and pelagic fish between the two regions. Biomagnification of some trace metals by micronekton, and of mercury by fish was evident in both regions. We conclude that ocean mine waste disposal at Niolam Island has a local impact on the smaller and less mobile pelagic communities in terms of trace metal concentrations, but has little effect on the abundance and biodiversity of the local food web.
CSIRO Marine and Atmospheric Research, Ecosciences Precinct, 41 Boggo Road, Dutton Park, Qld 4102, Australia. david.brewer@csiro.au
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D000818:Animals; D044822:Biodiversity; D017753:Ecosystem; D004784:Environmental Monitoring; D005399:Fishes / Q000378:metabolism; D020387:Food Chain; D006046:Gold; D008628:Mercury / Q000032:analysis / Q000378:metabolism; D008670:Metals / Q000032:analysis / Q000378:metabolism; D008906:Mining; D010219:Papua New Guinea; D012037:Refuse Disposal; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism; D015048:Zooplankton / Q000145:classification* / Q000254:growth & development / Q000378:metabolism
D008670:Metals; D014874:Water Pollutants, Chemical; D006046:Gold; D008628:Mercury