Understanding the combined influence of fine sediment and glyphosate herbicide on stream periphyton communities

Magbanua, Francis S.; Townsend, Colin R.; Hageman, Kimberly J.; Lange, Katharina; Lear, Gavin; Lewis, Gillian; Matthaei, Christoph D.

doi:10.1016/j.watres.2013.05.046

Cited by 41 publications

(44 citation statements)

References 52 publications

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“…Sediment addition did not affect bacterial community evenness but increased taxon richness at the phylum and order levels, in contrast with previous findings in the same mesocosm setup. Magbanua et al 42. and Piggott et al 43.…”

Section: Discussionmentioning

confidence: 97%

“…These mesocosms, which have been used to investigate multiple-stressor effects on stream periphyton, invertebrates and organic matter decomposition35414243, permit studying stressor effects under tightly controlled, statistically powerful yet highly realistic ecological conditions. They allow natural immigration and emigration of stream biota and experience the same environmental conditions as the river feeding them, a key strength of our study compared to laboratory experiments.…”

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confidence: 99%

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High-throughput amplicon sequencing and stream benthic bacteria: identifying the best taxonomic level for multiple-stressor research

Salis

Bruder

Piggott

et al. 2017

Sci Rep

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Disentangling the individual and interactive effects of multiple stressors on microbial communities is a key challenge to our understanding and management of ecosystems. Advances in molecular techniques allow studying microbial communities in situ and with high taxonomic resolution. However, the taxonomic level which provides the best trade-off between our ability to detect multiple-stressor effects versus the goal of studying entire communities remains unknown. We used outdoor mesocosms simulating small streams to investigate the effects of four agricultural stressors (nutrient enrichment, the nitrification inhibitor dicyandiamide (DCD), fine sediment and flow velocity reduction) on stream bacteria (phyla, orders, genera, and species represented by Operational Taxonomic Units with 97% sequence similarity). Community composition was assessed using amplicon sequencing (16S rRNA gene, V3-V4 region). DCD was the most pervasive stressor, affecting evenness and most abundant taxa, followed by sediment and flow velocity. Stressor pervasiveness was similar across taxonomic levels and lower levels did not perform better in detecting stressor effects. Community coverage decreased from 96% of all sequences for abundant phyla to 28% for species. Order-level responses were generally representative of responses of corresponding genera and species, suggesting that this level may represent the best compromise between stressor sensitivity and coverage of bacterial communities.

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Section: Discussionmentioning

confidence: 97%

mentioning

confidence: 99%

High-throughput amplicon sequencing and stream benthic bacteria: identifying the best taxonomic level for multiple-stressor research

Salis

Bruder

Piggott

et al. 2017

Sci Rep

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“…Since multiple stressor occurrence can be considered the rule rather than exception (Lange et al, 2011;Wagenhoff et al, 2011Wagenhoff et al, , 2013Magbanua et al, 2013;Piggott et al, 2015), diatom based water quality assessment in tropical streams requires the simultaneous quantification of variation in diatom taxonomic composition across multiple stressor gradients to improve the predictive capacity of inference models. The compromise has the potential to become more useful for 'pristine' streams where nutrient enrichment and organic pollution have been historically low.…”

Section: Variation Partitioning Of Diatom Species Data Matricesmentioning

confidence: 99%

“…Few studies have been carried out in temperate regions (e.g. Lange et al, 2011;Wagenhoff et al, 2011Wagenhoff et al, , 2013Magbanua et al, 2013;Piggott et al, 2015). Thus, a major challenge facing water quality managers in tropical regions is how to deal with multiple environmental factors.…”

Section: Introductionmentioning

confidence: 99%

Variation partitioning of diatom species data matrices: Understanding the influence of multiple factors on benthic diatom communities in tropical streams

Bere

Mangadze

Mwedzi

2016

Science of The Total Environment

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“…In addition, the response of sediment microorganisms to pesticide exposure depends to some extent on environmental conditions, e.g. supplies of inorganic nutrients, quantity and quality of organic matter, salinity and metals (Pratt and Barreiro, 1998;Garcia-Ortega et al, 2011;Muturi et al, 2013;Magbanua et al, 2013).…”

Section: Current Knowledge On Effects Of Pesticides On Sediment Micromentioning

confidence: 99%

Scientific Opinion on the effect assessment for pesticides on sediment organisms in edge‐of‐field surface water

2015

EFS2

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The EFSA Panel on Plant Protection Products and their Residues (PPR Panel) was tasked to revise the Guidance Document (GD) on Aquatic Ecotoxicology under Council Directive 91/414/EEC (SANCO/3268/2001 rev. 4 (final), 17 October 2002. This scientific opinion of the PPR Panel is the second of three requested deliverables within this mandate. The scientific background for the risk assessment on sediment organisms in edge-of-field surface waters is provided, with reference to benthic ecology and ecotoxicology, available test protocols and current knowledge on exposure and effects of sediment-bound plant protection products (PPPs). The scientific opinion provides approaches on how to derive regulatory acceptable concentrations (RACs) for sediment organisms and exposure to active substances of PPPs and transformation products of these substances, and how to link them in a tiered approach to predicted environmental concentrations (PECs) for the sediment compartment. A list of uncertainties in relation to such approaches is given. SUMMARYSediment Environmental Risk Assessment (ERA) is a combination of exposure and effect assessment. Proposals for these assessments are provided. The opinion describes specific protection goals (SPGs) for sediment-inhabiting organisms based on two options (1) the ecological threshold option (ETO), accepting negligible population effects only, and (2) if applicable, the ecological recovery option (ERO), accepting some population-level effects if ecological recovery takes place within an acceptable time period.Triggers for sediment ecotoxicity testing are proposed together with a decision scheme for when additional testing may be required. The ecotoxicologically relevant concentrations (ERCs) for sediment organisms are proposed, as this will be influenced by the choice of sediment layer, exposure metric and test duration.The current Forum for the co-ordination of pesticide fate models and their use (FOCUS) methodology for surface water does not consider the effect of multi-year applications, which could possibly lead to accumulation of pesticides in sediment. To account for this deficit, a proposed methodology for introducing an accumulation factor that can be used until an updated FOCUS methodology becomes available is presented in this opinion. The accumulation factor can be considered a conservative approach, since it does not include any possible transport processes, such as leaching or volatilisation, which may reduce the accumulation in sediment in the real field situation.A tiered effect assessment approach is proposed for different sediment organisms and how to link regulatory acceptable concentrations (RACs) to predicted environmental concentration (PECs). The assessment of bioaccumulation, biomagnification and secondary poisoning is discussed, as well as the prospect of improving ERA for sediment microorganisms.Transformation products from active substances also may need to be assessed, as well as mixture toxicity of formulations of plant protection products (PPPs). The op...

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Understanding the combined influence of fine sediment and glyphosate herbicide on stream periphyton communities

Cited by 41 publications

References 52 publications

High-throughput amplicon sequencing and stream benthic bacteria: identifying the best taxonomic level for multiple-stressor research

High-throughput amplicon sequencing and stream benthic bacteria: identifying the best taxonomic level for multiple-stressor research

Variation partitioning of diatom species data matrices: Understanding the influence of multiple factors on benthic diatom communities in tropical streams

Scientific Opinion on the effect assessment for pesticides on sediment organisms in edge‐of‐field surface water

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