Structural and functional responses of leaf‐associated fungal communities to chemical pollution in streams

Rossi, Florent; Artigas, Joan; Mallet, Clarisse

doi:10.1111/fwb.12937

Cited by 7 publications

(2 citation statements)

References 70 publications

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“…This kind of approach could thus be viewed as a powerful tool for developing predictive functional ecotoxicology in the sediment compartment, by considering the ecological role of both microorganisms and benthic invertebrates as consumers of organic matter. Reaching further forward, it should be possible to dissociate microbial-driven decomposition from invertebrate feeding, for example by enclosing the tablets in small-mesh-size bags (barring access to invertebrates) and large-mesh-size bags (giving access to invertebrates), as frequently used in studies assessing leaf-litter breakdown (Brosed et al, 2016;Rossi et al, 2017Rossi et al, , 2019. Finally, the methods tested here could be proposed for standardization to further improve sediment ERA protocol, as already done in the soil compartment through the TRIAD approach (ISO 19204, 2017).…”

Section: How Can Artificial Organic Matter Substrates Improve the Ecological Relevance Of Sediment Environmental Risk Assessment?mentioning

confidence: 99%

Towards simple tools to assess functional effects of contaminants on natural microbial and invertebrate sediment communities

Pesce

Campiche

Casado-Martínez

et al. 2019

Environ Sci Pollut Res

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Surface sediments can accumulate contaminants that affect microorganisms and invertebrates and disturb benthic ecological functions. However, effects of contaminants on ecological functions supported by sediment communities are understudied. Here, we tested the relevance of two simple tools to assess the ecotoxicological effects of metal contamination on natural sediment communities using particulate organic matter breakdown and decomposition as a functional descriptor. To this aim, we performed a 21-day laboratory microcosm experiment to assess the individual and combined effects of Cu and As (nominal concentration of 40 mg kg−1 dw each) using the bait-lamina method (cellulose, bran flakes, and active coal in PVC strips) as well as artificial tablets (cellulose, bran flakes and active coal embedded in an agar matrix). Sediment toxicity was also evaluated using the standardized ostracod toxicity test. Both the bait-lamina and artificial tablet methods showed low effects of As on organic matter breakdown and decomposition but strong effects of Cu on this important ecological function. Both also showed that the presence of Cu and As in mixture in the sediment induced total inhibition of organic matter breakdown and decomposition. The ostracod toxicity test also showed high toxicity of Cu-spiked and Cu-plus-As-spiked sediments and low toxicity of As-spiked sediments. Besides confirming that artificial organic matter substrates are relevant and useful for assessing the functional effects of contaminants on sediment micro-and macro-organism communities, these results suggest that the proposed methods offer promising perspectives for developing tools for use in assessing functional ecotoxicology in the sediment compartment.

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Section: How Can Artificial Organic Matter Substrates Improve the Ecological Relevance Of Sediment Environmental Risk Assessment?mentioning

confidence: 99%

Towards simple tools to assess functional effects of contaminants on natural microbial and invertebrate sediment communities

Pesce

Campiche

Casado-Martínez

et al. 2019

Environ Sci Pollut Res

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“…Fernández et al (2015) found a correlation between structural changes in microbial communities as well as fungal biomass with increasing predicted fungicide toxicity based on the chemical analysis and toxic unit calculation by combining fungicide monitoring with field studies on fungal communities. Rossi et al (2017) found differences in fungi community structure between alder leaves exposed in a pristine part of a stream and those exposed at a downstream site where several fungicides were detected by chemical analysis. Gardeström et al (2016) observed that fungal communities from an agriculturally influenced stream were more tolerant to azoxystrobin than a community without a history of pesticide exposure, indicating a shift in community composition toward tolerant species, also known as pollution induced community tolerance (Molander et al, 1990).…”

Section: Exposure and Effects Of Fungicides On Freshwater Fungimentioning

confidence: 85%

Aquatic Fungi: A Disregarded Trophic Level in Ecological Risk Assessment of Organic Fungicides

Ittner

Junghans

Werner

2018

Front. Environ. Sci.

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Freshwater fungi are a diverse group of organisms and fulfill important functions in the food web dynamics of surface water ecosystems. Ascomycetic and basidiomycetic hyphomycetes play key roles in leaf litter breakdown in rivers and creeks, while parasitic chytrids are an important food source for small invertebrates in lakes. Field studies indicate that fungal communities are affected by fungicides at environmentally relevant concentrations. However, despite their ecological importance, freshwater fungi are currently not specifically addressed in the EU regulatory frameworks with respect to the protection of surface waters. Specifically, the prospective risk assessment of fungicides does not evaluate adverse effects on non-target aquatic fungi. This paper aims to describe important functions of freshwater fungi, provides an overview of adverse effect levels of fungicides on this organism group, and proposes to integrate the fungal community of freshwater ecosystems as an additional trophic level in the current fungicide risk assessment frameworks. Results of a literature review on the effects of fungicides on aquatic fungi revealed that information on the toxicity of fungicides to non-target aquatic fungi is limited. This is, in part, due to the lack of standardized bioassays using aquatic fungi as test species. Although there is an encouraging number of bioassays focusing on the degradation of dead organic material by hyphomycetes, studies on fungicide effects on other important ecological functions, like the control of algal blooms in lentic surface waters by parasitic chytrid fungi, or on mutualistic fungi living in the guts of aquatic arthropods are largely missing. Thus, the further development and standardized of different fungi bioassays is recommended.

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Quantitative Real-Time PCR (qPCR) to Estimate Molecular Fungal Abundance

Baschien

Carl

2020

Methods to Study Litter Decomposition

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Structural and functional responses of leaf‐associated fungal communities to chemical pollution in streams

Cited by 7 publications

References 70 publications

Towards simple tools to assess functional effects of contaminants on natural microbial and invertebrate sediment communities

Towards simple tools to assess functional effects of contaminants on natural microbial and invertebrate sediment communities

Aquatic Fungi: A Disregarded Trophic Level in Ecological Risk Assessment of Organic Fungicides

Quantitative Real-Time PCR (qPCR) to Estimate Molecular Fungal Abundance

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