Waste water discharge from a large Ni-Zn open cast mine degrades benthic integrity of Lake Nuasjärvi (Finland)

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dc.contributor.author Luoto, Tomi P.
dc.contributor.author Leppänen, Jaakko Johannes
dc.contributor.author Weckström, Jan
dc.date.accessioned 2021-09-19T22:24:25Z
dc.date.available 2021-12-18T03:45:11Z
dc.date.issued 2019-12
dc.identifier.citation Luoto , T P , Leppänen , J J & Weckström , J 2019 , ' Waste water discharge from a large Ni-Zn open cast mine degrades benthic integrity of Lake Nuasjärvi (Finland) ' , Environmental Pollution , vol. 255 , no. Part 2 , 113268 . https://doi.org/10.1016/j.envpol.2019.113268
dc.identifier.other PURE: 126992791
dc.identifier.other PURE UUID: df3e9a53-ae6e-45c1-b731-3d8e577c5f97
dc.identifier.other RIS: urn:91C0C519274E40693FD57A19BE2808EA
dc.identifier.other WOS: 000498340400050
dc.identifier.other ORCID: /0000-0001-6925-3688/work/66365355
dc.identifier.other ORCID: /0000-0001-5604-617X/work/66367486
dc.identifier.uri http://hdl.handle.net/10138/334444
dc.description.abstract The Talvivaara/Terrafame multi-metal mining company is Europe’s largest nickel open cast mine, it is also known for the largest wastewater leakage in the Finnish mining history and a series of other accidents. In this paleolimnological study, influences of a recently constructed treated waste water discharge pipeline into Lake Nuasjärvi were investigated by analyzing past (pre-disturbance) and present community compositions of key aquatic organism groups, including diatoms, Cladocera and Chironomidae, along spatial (distance, water depth) gradients. In addition to defining ecological changes and impacts of saline mine waters in the lake, chironomids were used to quantitatively reconstruct bottom water oxygen conditions before and after the pipe installation (in 2015). The diatom and cladoceran communities, which reflect more the open-water habitat, showed only relatively minor changes throughout the lake, but a general decrease in diversity was observed within both groups. Chironomids, which live on substrates, showed more significant changes, including complete faunal turnovers and deteriorated benthic quality, especially at the sites close to the pipe outlet, where also chironomid diversity was almost completely lost. Furthermore, the reconstructed hypolimnetic oxygen values indicated a major oxygen decline and even anoxia at the sites near the pipe outlet. The limnoecological influence of the pipe decreased at sites located counter-flow or behind underwater barriers suggesting that the waste waters currently have location-specific impacts. Our study clearly demonstrates that whereas the upper water layers appear to have generally maintained their previous state, the deep-water layers close to the pipe outlet have lost their ecological integrity. Furthermore, the current hypolimnetic anoxia close to the pipe indicates enhanced lake stratification caused by the salinated mine waters. This study clearly exhibits the need to investigate different water bodies at several trophic levels in a spatiotemporal context to be able to reliably assess limnoecological impacts of mining. en
dc.format.extent 11
dc.language.iso eng
dc.relation.ispartof Environmental Pollution
dc.rights cc_by_nc_nd
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 1172 Environmental sciences
dc.subject Chironomidae
dc.subject Cladocera
dc.subject diatoms
dc.subject mine impact
dc.subject paleolimnology
dc.subject Mine impact
dc.subject Diatoms
dc.subject Paleolimnology
dc.subject CLIMATE
dc.title Waste water discharge from a large Ni-Zn open cast mine degrades benthic integrity of Lake Nuasjärvi (Finland) en
dc.type Article
dc.contributor.organization Ecosystems and Environment Research Programme
dc.contributor.organization Helsinki Institute of Sustainability Science (HELSUS)
dc.contributor.organization Environmental Change Research Unit (ECRU)
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1016/j.envpol.2019.113268
dc.relation.issn 0269-7491
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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