Mixtures of co-occurring chemicals in freshwater systems across the continental US

Marshall, Melanie M.; McCluney, Kevin E.

doi:10.1016/j.envpol.2020.115793

Cited by 7 publications

(3 citation statements)

References 107 publications

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“…Moreover, there is a need to examine these effects for other chemicals, or for mixtures of chemicals (Bernhardt, Rosi, & Gessner, 2017;Marshall & McCluney, 2021) which may simultaneously include added nutrients. In addition, future studies need to examine dynamics across a broad range of light levels and seek to differentiate the impacts of caffeine on autotrophic and heterotrophic components of biofilms.…”

Section: Discussionmentioning

confidence: 99%

“…Future work is needed to determine the different mechanisms of effects of caffeine on emergent insects, including the relative importance of direct exposure to caffeine versus indirect effects, through changes in stream biofilm, a key food source at the base of food webs. Moreover, there is a need to examine these effects for other chemicals, or for mixtures of chemicals (Bernhardt, Rosi, & Gessner, 2017; Marshall & McCluney, 2021) which may simultaneously include added nutrients. In addition, future studies need to examine dynamics across a broad range of light levels and seek to differentiate the impacts of caffeine on autotrophic and heterotrophic components of biofilms.…”

Section: Discussionmentioning

confidence: 99%

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Caffeine and canopy cover interact to alter biofilm nutrient content, benthic invertebrates, and insect emergence

Marshall

Metzner

McCluney

2022

River Research & Apps

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The addition of trace contaminants to surface waters is recognized as a rising environmental concern and caffeine is among those most commonly detected. Classic toxicological analyses of single organisms have described some of the impacts of caffeine on freshwater organisms, but few have examined ecological interactions, food webs, or aquatic‐terrestrial linkages, especially in natural aquatic systems. This study used an in situ manipulative experiment to effects of caffeine addition on aquatic biofilms and biomass of aquatic and emergent insects. We used chemical diffusing substrata to introduce small concentrations of caffeine to streams and analyzed effects on downstream biofilm nutrient content, benthic macroinvertebrates, and emergent insects. We found that caffeine addition decreased the biomass of emergent insects by 56% and altered biofilm nutrient content in complex ways that interact with canopy cover, with stronger effects of caffeine addition under low canopy cover (higher light). Thus, the impacts of this common aquatic contaminant may influence the linked riparian food web by decreasing emergent insects, an important food source for riparian insectivores.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Caffeine and canopy cover interact to alter biofilm nutrient content, benthic invertebrates, and insect emergence

Marshall

Metzner

McCluney

2022

River Research & Apps

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“…Anthropogenic chemical pollution has profound impacts on the ecological status of surface waters at a continental scale (Malaj et al, 2014), and is therefore increasingly recognised as a driving force behind biodiversity loss (Balvanera et al, 2019;Groh et al, 2022;Sigmund et al, 2023). However, especially diffuse pollution is characterised by the presence of complex multi-component mixtures (Finckh et al, 2022;Kandie et al, 2020;Marshall and McCluney, 2021). These mixtures comprise a diverse array of organic chemicals, including pharmaceuticals and personal care products (PPCPs), pesticides, surfactants, industrial chemicals, and transformation products, collectively referred to as chemicals of emerging concern (CECs) (Ankley et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

A multi-scenario risk assessment strategy applied to mixtures of chemicals of emerging concern in the River Aconcagua basin in Central Chile

Inostroza,

Elgueta,

Krauss

et al. 2023

Preprint

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Streams and rivers are characterised by the presence of various chemicals of emerging concern (CECs), including pesticides, pharmaceuticals, personal care products, and industrial chemicals. While these chemicals are found usually only in low (ng/L) concentrations, they might still harm aquatic life and disrupt the ecological balance of aquatic ecosystems due to their high ecotoxicological potency. Environmental risk assessments that account for the complexity of exposures are needed in order to evaluate the toxic pressure of these chemicals, which also provide suggestions for risk mitigation and management, if necessary. Currently, most studies on the co-occurrence and environmental impacts of CECs are conducted in countries of the Global North, leaving massive knowledge gaps in countries of the Global South. In this study, we implement a multi-scenario risk assessment strategy to improve the assessment of both the exposure and hazard components in the chemical risk assessment process. Our strategy incorporates a systematic consideration and weighting of CECs that were not detected, as well as an evaluation of the uncertainties associated with Quantitative Structure-Activity Relationships (QSARs) predictions for chronic ecotoxicity. Furthermore, we present a novel approach to identifying mixture risk drivers. To expand our knowledge beyond well-studied aquatic ecosystems, we applied this multi-scenario strategy to the River Aconcagua basin of Central Chile. The analysis revealed that the concentrations of CECs exceeded acceptable risk thresholds for selected organism groups and the most vulnerable taxonomic groups. Streams flowing through agricultural areas and sites near the river mouth exhibited the highest risks. Notably, the eight risk drivers among the 153 co-occurring chemicals accounted for 66-92% of the observed risks in the river basin. Six of them are pesticides and pharmaceuticals, chemical classes known for their high biological activity in specific target organisms.

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Characterization of the contamination fingerprint of wastewater treatment plant effluents in the Henares River Basin (central Spain) based on target and suspect screening analysis

Lopez-Herguedas

González-Gaya

Castelblanco-Boyacá

et al. 2022

Science of The Total Environment

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Mixtures of co-occurring chemicals in freshwater systems across the continental US

Cited by 7 publications

References 107 publications

Caffeine and canopy cover interact to alter biofilm nutrient content, benthic invertebrates, and insect emergence

Caffeine and canopy cover interact to alter biofilm nutrient content, benthic invertebrates, and insect emergence

A multi-scenario risk assessment strategy applied to mixtures of chemicals of emerging concern in the River Aconcagua basin in Central Chile

Characterization of the contamination fingerprint of wastewater treatment plant effluents in the Henares River Basin (central Spain) based on target and suspect screening analysis

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