Erratum to: Litter breakdown for ecosystem integrity assessment also applies to streams affected by pesticides

Brosed, Magali; Lamothe, Sylvain; Chauvet, Éric

doi:10.1007/s10750-016-2728-4

Cited by 19 publications

(18 citation statements)

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“…Additionally, our detailed study at the scale of microhabitats allowed us to document chlorpyrifosinduced effects on invertebrate communities inhabiting leaf packs, along with lower leaf decomposition rates. These results are in keeping with field studies correlating leaf breakdown inhibition with pesticide exposures (Sch€ afer et al 2007, 2012, Rasmussen et al 2012b, Brosed et al 2016, and offer a mechanistic explanation for such impacts, underscoring the indirect effects of insecticides through invertebrate decomposers at sublethal concentrations. Moreover, our results strongly support the notion that leaf decomposition is a useful early indicator of ecological impairment in stream ecosystems and should complement the suite of structural measurements already employed in biomonitoring (Gessner and Chauvet 2002, Pestana et al 2009, Sch€ afer et al 2012, Brosed et al 2016).…”

Section: Discussionsupporting

confidence: 82%

“…Furthermore, Cuppen et al (1995) detected reduced decomposition rates due to detritivore mortality in similar freshwater mesocosms. More generally, these results contribute to a growing body of literature reporting indirect impacts of insecticide contamination on leaf breakdown in field and mesocosm studies (Lauridsen et al 2006, Kreutzweiser et al 2008, Pestana et al 2009, Sch€ afer et al 2012, Brosed et al 2016).…”

Section: Single Stressor Effectssupporting

confidence: 60%

“…, Brosed et al. ), and offer a mechanistic explanation for such impacts, underscoring the indirect effects of insecticides through invertebrate decomposers at sublethal concentrations. Moreover, our results strongly support the notion that leaf decomposition is a useful early indicator of ecological impairment in stream ecosystems and should complement the suite of structural measurements already employed in biomonitoring (Gessner and Chauvet , Pestana et al.…”

Section: Discussionmentioning

confidence: 99%

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Chlorpyrifos interacts with other agricultural stressors to alter stream communities in laboratory microcosms

Chará‐Serna

Richardson

2017

Ecological Applications

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Abstract. Chlorpyrifos is one of the most widely used agricultural insecticides in the world, but to date there is limited empirical information about its potential to interact with other common agricultural stressors. We conducted a 15-d, community-level, microcosm experiment evaluating individual and combined effects of chlorpyrifos, nutrient enrichment, and sedimentation on stream invertebrate communities (abundance, biomass, richness, size structure, composition) and ecosystem processes (primary productivity and leaf decomposition). We found that sedimentation was the most detrimental stressor, with significant negative impacts on most invertebrate community and ecosystem function variables. Even though chlorpyrifos did not cause significant invertebrate mortality in the microcosms, it still altered ecosystem function by lowering leaf decomposition rates, probably through sublethal inhibition of invertebrate shredders. Furthermore, we observed a significant reversal interaction between chlorpyrifos and sediment for small-sized invertebrates collected in gravel (abundance in sediment 9 insecticide microcosms was 2.4 times lower than predicted by additivity), as well as an antagonistic interaction with nutrients on invertebrate richness in the same microhabitat (richness in nutrient 9 insecticide microcosms was 1.6 times higher than predicted by additivity). Our results suggest that chlorpyrifos has the potential to alter freshwater ecosystem function and interact non-additively with other common agricultural stressors. These findings are in keeping with a growing body of research highlighting that multiple stressor interactions and ecosystem processes should be considered when evaluating the impacts of organic toxicants on freshwater ecosystems.

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Section: Discussionsupporting

confidence: 82%

Section: Single Stressor Effectssupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

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Chlorpyrifos interacts with other agricultural stressors to alter stream communities in laboratory microcosms

Chará‐Serna

Richardson

2017

Ecological Applications

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“…This reality copes with the still increasing fertilizers (including NO 3 , P 2 O 5 ad K 2 O) and pesticides consumption across Europe (FAOSTAT). In this context, the evaluation of the threat posed by such a chemical multi-contamination on aquatic organisms and stream ecosystems integrity and the ecological functions and services they provide has become a central preoccupation for societies, stream managers and scientists ( Brosed et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Interactive Effects of Pesticides and Nutrients on Microbial Communities Responsible of Litter Decomposition in Streams

et al. 2018

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Global contamination of streams by a large variety of compounds, such as nutrients and pesticides, may exert a high pressure on aquatic organisms, including microbial communities and their activity of organic matter decomposition. In this study, we assessed the potential interaction between nutrients and a fungicide and herbicide [tebuconazole (TBZ) and S-metolachlor (S-Met), respectively] at realistic environmental concentrations on the structure (biomass, diversity) and decomposition activity of fungal and bacterial communities (leaf decay rates, extracellular enzymatic activities) associated with Alnus glutinosa (Alnus) leaves. A 40-day microcosm experiment was used to combine two nutrient conditions (mesotrophic and eutrophic) with four pesticide treatments at a nominal concentrations of 15 μg L-1 (control, TBZ and S-Met, alone or mixed) following a 2 × 4 full factorial design. We also investigated resulting indirect effects on Gammarus fossarum feeding rates using leaves previously exposed to each of the treatments described above. Results showed interactive effects between nutrients and pesticides, only when nutrient (i.e., nitrogen and phosphorus) concentrations were the highest (eutrophic condition). Specifically, slight decreases in Alnus leaf decomposition rates were observed in channels exposed to TBZ (0.01119 days-1) and S-Met (0.01139 days-1) than in control ones (0.01334 days-1) that can partially be explained by changes in the structure of leaf-associated microbial communities. However, exposition to both TBZ and S-Met in mixture (MIX) led to comparable decay rates to those exposed to the pesticides alone (0.01048 days-1), suggesting no interaction between these two compounds on microbial decomposition. Moreover, stimulation in ligninolytic activities (laccase and phenol oxidase) was observed in presence of the fungicide, possibly highlighting detoxification mechanisms employed by microbes. Such stimulation was not observed for laccase activity exposed to the MIX, suggesting antagonistic interaction of these two compounds on the ability of microbial communities to cope with stress by xenobiotics. Besides, no effects of the treatments were observed on leaf palatability for macroinvertebrates. Overall, the present study highlights that complex interactions between nutrients and xenobiotics in streams and resulting from global change can negatively affect microbial communities associated with leaf litter, although effects on higher trophic-level organisms remains unclear.

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“…Litter breakdown plays a pivotal role in regulating the availability and transport of allochthonous organic matter that supports stream foodwebs and energetics (Gessner and Chauvet 2002). As litter breakdown is sensitive to environmental stressors and relatively easy to measure, it is one of the most widely used functional indicators to assess the impacts of anthropogenic disturbances in watersheds (von Schiller et al 2017), such as forestry activities (see references in Chauvet et al 2016), nutrient and pesticide contamination (Woodward et al 2012, Brosed et al 2016, flow regulation (Moll a et al 2017), and urbanization (Chadwick et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Relations of interannual differences in stream litter breakdown with discharge: bioassessment implications

et al. 2018

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Ecosystem‐level processes are increasingly used by researchers and managers as indicators of ecological integrity for bioassessment, particularly in streams. However, processes like litter breakdown integrate multiple mechanistic pathways, which can vary differentially even under natural, unimpacted conditions. In particular, weather‐driven hydrologic variations may strongly influence invertebrate shredder feeding and physical abrasion, inducing high natural variability of litter breakdown rates, which may obscure the effects of anthropogenic disturbances. Yet, such variability is rarely assessed to refine benchmarks of ecological status. Here, we quantified how interannual hydrologic differences contributed to the spatio‐temporal variability of litter breakdown rate and its components (fragmentation, λF; and dissolution and microbial decomposition, λm), in low‐order unimpacted, perennial streams across three climatically similar regions in temperate Canada. We measured litter breakdown rates in coarse (5 or 10 mm; kc)‐ and fine‐mesh (0.5 mm; kf) leaf bags during fall for 2–4 yr and used variance partitioning to disentangle the variation of kc, λF, and λm, as explained by hydrologic indices (during and prior to leaf bag incubation), decomposer‐related variables, and water chemistry. Contrary to our hypotheses, interannual hydrologic variability was unrelated to λF, and poorly predicted λm and kc within regions. Within‐region spatial (i.e., across sites in a year) and temporal (across years at a site) differences in kc approximated or exceeded the range of natural variability suggested to characterize reference conditions by a popular bioassessment framework. Accordingly, we recommend site‐ and region‐specific modifications of benchmarks for reference conditions that account for interannual variability, while cautioning about their potential non‐stationarity under climate change. Composite parameters such as kc/kf and λF/λm were substantially more variable across sites, and hence are not robust assessment parameters. As the range of natural variability of litter breakdown revealed in this study can overlap with the average impacts of certain anthropogenic disturbances (e.g., nutrient enrichment) on this parameter reported by previous research, we emphasize the need to include other structural and functional indicators to ensure comprehensive stream bioassessments.

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Erratum to: Litter breakdown for ecosystem integrity assessment also applies to streams affected by pesticides

Cited by 19 publications

References 0 publications

Chlorpyrifos interacts with other agricultural stressors to alter stream communities in laboratory microcosms

Chlorpyrifos interacts with other agricultural stressors to alter stream communities in laboratory microcosms

Interactive Effects of Pesticides and Nutrients on Microbial Communities Responsible of Litter Decomposition in Streams

Relations of interannual differences in stream litter breakdown with discharge: bioassessment implications

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