Spatiotemporal and teratological analyses of diatom assemblages from sediments contaminated with industrial effluents in the St. Lawrence River near Cornwall (Ontario, Canada)

Moir, Katherine E.; Ridal, Jeffrey J.; Cumming, Brian F.

doi:10.1007/s10750-021-04792-7

Cited by 5 publications

(2 citation statements)

References 78 publications

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“…The absence could be driven by high Hg concentrations, as the detrimental effect of Hg on chironomid life history responses has been shown in laboratory studies (Vermeulen et al 2000; Azevedo-Pereira and Soares 2010). Organic e uent from pulp-and-paper mills is associated with detrimental responses in chironomids due to its high biological oxygen demand (Brodersen and Quinlan 2006), and diatoms from a previous Zone 1 sediment core indicate eutrophic conditions pre-1970 (Moir et al 2022). While many chironomids can survive periods of anoxia, prolonged anoxic conditions can extirpate even tolerant taxa (Hynynen et al 2004).…”

Section: Chironomid Absence In the Cornwall Waterfrontmentioning

confidence: 99%

Subfossil Chironomid Assemblages as Indicators of Remedial Efficacy in the Historically Contaminated St. Lawrence River at Cornwall, Ontario

Armstrong,

Moir,

Ridal

et al. 2023

Arch Environ Contam Toxicol

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Long-term data are required to quantify the impacts of historic industrial pollution and subsequent remedial action on the nearshore benthic community in the St. Lawrence River Area of Concern at Cornwall, Ontario. Speci cally, high-quality temporal records are needed to understand changes in benthic invertebrate assemblages in response to multiple possible drivers including industrial pollution, environmental heterogeneity, and climate warming. We compare long-term records of subfossil chironomid assemblages and geochemical variables among sediment cores from two Cornwall sites with differing pollution histories and a minimally disturbed downstream reference site. Chironomids were functionally absent from the Cornwall sediment cores when mercury and zinc concentrations were elevated. As metal concentrations decreased in more recent sediment intervals, chironomid abundance and the relative abundance of pollution-sensitive taxa increased. Recently deposited sediment in all three sediment cores display increased relative abundance of warm-water, macrophyte-associated taxa. We conclude that these temporal changes in chironomid assemblages provide evidence for ecological recovery for both of the impacted sites, consistent with the objectives of the current management strategy. These ndings advance our understanding of industrial impacts on uvial chironomid ecology, directly inform local management strategies, and further develop the application of chironomids as bioindicators for contaminated sediments.

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Section: Chironomid Absence In the Cornwall Waterfrontmentioning

confidence: 99%

Subfossil Chironomid Assemblages as Indicators of Remedial Efficacy in the Historically Contaminated St. Lawrence River at Cornwall, Ontario

Armstrong,

Moir,

Ridal

et al. 2023

Arch Environ Contam Toxicol

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“…Diatoms can accumulate high concentrations of metals, which may cause disturbances in their metabolism and photosynthesis. The consequence of these processes is possible deformations in the structure of diatom valves, known as teratologies (Moir et al 2022 ). Most likely, teratological forms appear a few days after the first metal contamination and are early detection biomarkers (Pandey and Bergey 2018 ; Falasco et al 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Responses of diatom composition and teratological forms to environmental pollution in a post-mining lake (SW Poland)

Sienkiewicz,

Gąsiorowski,

Sekudewicz

et al. 2023

Environ Sci Pollut Res

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Various types of environmental stressors, such as heavy metals, lignite residues, or extremely low water pH, cause the formation of teratological forms of diatoms during the reproductive cycle. The damage mainly includes an abnormal diatom valve outline, changes in the striation pattern, anomalies in the raphe line/sternum, reduction in the cell size, metabolism alterations, or combined deformities. Diatom remains with such morphological deformities occur in the sediments of post-mining lake ŁK-46 (SW Poland). This lake was formed by excavation after the end of lignite exploitation in the mid-1960s. The percentage of teratological valves in the studied lake ranged from 12 to 33% of the relative abundance. The majority of abnormal diatoms have been observed in species of Eunotia. The reconstruction of the diatom-inferred pH (DI-pH), together with the concentration of heavy metals in the sediments and contemporary measurements of the water pH, indicates that the lake was contaminated to varying degrees and was acidic from the beginning of lake creation until today. The lake is located in an area of acid mine drainage (AMD), and in its vicinity, there are overburden heaps containing lignite residues, which are eroded and supplied to the lake, constantly acidifying the water. In the youngest sediments, the concentration of heavy metals increased, while the percentage of abnormal diatoms decreased. Determining which factor, i.e., extremely low water pH and the presence of lignite or heavy metals, was responsible for the formation or reduction of teratogenic forms of diatoms is very difficult.

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Qualitative and quantitative assessment of diatom deformities and protoplasmic condition under metal and metalloid stress

et al. 2023

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Spatiotemporal and teratological analyses of diatom assemblages from sediments contaminated with industrial effluents in the St. Lawrence River near Cornwall (Ontario, Canada)

Cited by 5 publications

References 78 publications

Subfossil Chironomid Assemblages as Indicators of Remedial Efficacy in the Historically Contaminated St. Lawrence River at Cornwall, Ontario

Subfossil Chironomid Assemblages as Indicators of Remedial Efficacy in the Historically Contaminated St. Lawrence River at Cornwall, Ontario

Responses of diatom composition and teratological forms to environmental pollution in a post-mining lake (SW Poland)

Qualitative and quantitative assessment of diatom deformities and protoplasmic condition under metal and metalloid stress

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