Lavoie, Isabelle ORCID: https://orcid.org/0000-0002-2918-6297, Morin, Soizic, Laderriere, Vincent et Fortin, Claude
ORCID: https://orcid.org/0000-0002-2479-1869
(2018).
Freshwater Diatoms as Indicators of Combined Long-Term Mining and Urban Stressors in Junction Creek (Ontario, Canada).
Environments
, vol. 5
, nº 2.
p. 30.
DOI: 10.3390/environments5020030.
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Résumé
Sudbury (Ontario, Canada) has a long mining history that has left the region with a distinctive legacy of environmental impacts. Several actions have been undertaken since the 1970s to rehabilitate this deteriorated environment, in both terrestrial and aquatic ecosystems. Despite a marked increase in environmental health, we show that the Junction Creek system remains under multiple stressors from present and past mining operations, and from urban-related pressures such as municipal wastewater treatment plants, golf courses and stormwater runoff. Water samples have elevated metal concentrations, with values reaching up to 1 mg.L ⁻¹ Ni, 40 μg.L ⁻¹ Zn, and 0.5 μg.L ⁻¹ Cd. The responses of diatoms to stressors were observed at the assemblage level (metal tolerant species, nutrient-loving species), and at the individual level through the presence of teratologies (abnormal diatom frustules). The cumulative criterion unit (CCU) approach was used as a proxy for metal toxicity to aquatic life and suggested elevated potential for toxicity at certain sites. Diatom teratologies were significantly less frequent at sites with CCU values <1, suggesting “background” metal concentrations as compared to sites with higher CCU values. The highest percentages of teratologies were observed at sites presenting multiple types of environmental pressures.
Type de document: | Article |
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Mots-clés libres: | biomonitoring; cumulative criterion units; diatoms; metals; mines; multi-stress; streams; nutrients; teratologies; urban stressors |
Centre: | Centre Eau Terre Environnement |
Date de dépôt: | 06 avr. 2018 15:49 |
Dernière modification: | 11 févr. 2022 14:12 |
URI: | https://espace.inrs.ca/id/eprint/6888 |
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