Long-Term Persistence of Pesticides and TPs in Archived Agricultural Soil Samples and Comparison with Pesticide Application

Chiaia‐Hernández, Aurea C.; Keller, Armin; Wächter, Daniel; Steinlin, Christine; Camenzuli, Louise; Hollender, Juliane; Krauß, Martin

doi:10.1021/acs.est.7b02529

Cited by 129 publications

(94 citation statements)

References 58 publications

(130 reference statements)

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“…This is especially relevant within a region experiencing warming temperatures and drier conditions [32], where pollutants can be further concentrated due to lower water levels. Some especially promising approaches to tracking pollution histories in lakes include the use of stable isotope ratios of PAHs that can then be used to further 'fingerprint' the provenance of contaminants [33], and the application of non-target high-resolution mass spectrometry to help characterize chemical contamination [34], as well as '-Omics' screening methods for source identification [35]. Furthermore, given that lakes are often common features of many landscapes worldwide, there is considerable potential to extend sedimentary analyses to encompass broad spatial scales, such as examining trends in mercury deposition across large regions of the Arctic, far from any local sources [36], or tracking the deposition of fly ash particles [37], which are by-products of fossil fuel combustion, or emerging water quality issues such as the accumulation of microplastics [38].…”

Section: Forensic Palaeolimnology: Finding the 'Smoking Guns' In Retrmentioning

confidence: 99%

Under the radar: long-term perspectives on ecological changes in lakes

Smol

2019

Proc. R. Soc. B.

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Aquatic ecosystems are constantly changing due to natural and anthropogenic stressors. When dealing with such ‘moving targets’, one of the greatest challenges faced by scientists, managers and policy makers is to use appropriate time scales for environmental assessments. However, most aquatic systems lack monitoring data, and if a programme does exist, rarely have data been collected for more than a few years. Hence, it is often difficult or impossible to determine the nature and timing of ecosystem changes based on these short-term datasets. Furthermore, as environmental assessments are typically performed after a problem is identified, critical data regarding pre-disturbance (or reference) conditions are rarely available. Here, I summarize some recent studies employing lake sediment analyses (i.e. palaeolimnology) that have provided retrospective assessments of ecosystem changes that have been emerging slowly and often innocuously ‘under the radar’. My examples include the identification of legacy effects of acid rain and logging, namely long-term declines in calcium concentrations in softwater lakes, which have led to significant repercussions for ecosystem services. I then show that past trajectories of aerial pollution from the burgeoning oil sands operations of western Canada can be tracked using environmental proxies preserved in dated sediment cores, and how these data can be used to determine the relative contributions of natural versus industrial sources of pollutants. I conclude by reviewing how palaeolimnological analyses have linked climate change with the proliferation of harmful blue-green algal (cyanobacterial) blooms, even without the addition of limiting nutrients. Collectively, these studies show that effective ecosystem management, particularly for incremental environmental stressors, requires temporal sampling windows that are not readily available with standard monitoring, but can be supplemented with high-resolution lake sediment analyses.

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Section: Forensic Palaeolimnology: Finding the 'Smoking Guns' In Retrmentioning

confidence: 99%

Under the radar: long-term perspectives on ecological changes in lakes

Smol

2019

Proc. R. Soc. B.

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“…The s-triazine herbicide atrazine is one of the world's most heavily applied herbicides, in particular used on crops such as maize, sugarcane and sorghum. Atrazine and its degradation products can be found in the soil for decades after application [24,25], often leading to widespread contamination of both water and soils [26,27]. Even at very low concentrations atrazine may act as endocrinedisrupting chemical in frogs [28], among other effects leading to sexual transformation [29,30].…”

Section: Introductionmentioning

confidence: 99%

Modeling microbial communities from atrazine contaminated soils promotes the development of biostimulation solutions

et al. 2018

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Microbial communities play a vital role in biogeochemical cycles, allowing the biodegradation of a wide range of pollutants. The composition of the community and the interactions between its members affect degradation rate and determine the identity of the final products. Here, we demonstrate the application of sequencing technologies and metabolic modeling approaches towards enhancing biodegradation of atrazine-a herbicide causing environmental pollution. Treatment of agriculture soil with atrazine is shown to induce significant changes in community structure and functional performances. Genome-scale metabolic models were constructed for Arthrobacter, the atrazine degrader, and four other non-atrazine degrading species whose relative abundance in soil was changed following exposure to the herbicide. By modeling community function we show that consortia including the direct degrader and non-degrader differentially abundant species perform better than Arthrobacter alone. Simulations predict that growth/degradation enhancement is derived by metabolic exchanges between community members. Based on simulations we designed endogenous consortia optimized for enhanced degradation whose performances were validated in vitro and biostimulation strategies that were tested in pot experiments. Overall, our analysis demonstrates that understanding community function in its wider context, beyond the single direct degrader perspective, promotes the design of biostimulation strategies.These authors contributed equally:

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“…The function allowing consumption of the resource must be i) costly, ii) essential and iii) leaky. Atrazine is one of the most heavily applied herbicide worldwide which is relatively persistent and mobile in soil, and whose degradation products can be traced in soils decades after application 13,14 . Atrazine can be mineralized by microorganisms and is a source of nitrogen.…”

Section: Textmentioning

confidence: 99%

“…We then evaluated the atrazine mineralization potential, using 14 C-atrazine either labelled on the ethylamino chain or on the s -triazinic cycle, of the consortia that have evolved in the four atrazine containing environments (Fig 3) and compared them to the ancestral ones. Interestingly, we observed a significant increase of the mineralization potential of the ethylamino chain in evolved consortia compared to ancestors in all but the three nitrogen sources supplemented medium.…”

Section: Textmentioning

confidence: 99%

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Labour sharing promotes coexistence in atrazine degrading bacterial communities

Billet

Devers

Rouard

et al. 2019

Preprint

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SUMMARYMicrobial communities exert a pivotal role in the biodegradation of xenobiotics including pesticides1. In the case of atrazine, multiple studies have shown that its degradation involved a consortia rather than a single species2,3,4,5, but little is known about how interdependency between the species composing the consortium is set up. The Black Queen Hypothesis (BQH) formalized theoretically the conditions leading to the evolution of dependency between species6: members of the community called ‘helpers’ provide publicly common goods obtained from the costly degradation of a compound, while others called ‘beneficiaries’ take advantage of the public goods, but lose access to the primary resource through adaptive degrading gene loss. Here, we test whether liquid media supplemented with the herbicide atrazine could support coexistence of bacterial species through BQH mechanisms. We observed the establishment of dependencies between species through atrazine degrading gene loss. Labour sharing between members of the consortium led to coexistence of multiple species on a single resource and improved atrazine degradation potential. Until now, pesticide degradation has not been approached from an evolutionary perspective under the BQH framework. We provide here an evolutionary explanation that might invite researchers to consider microbial consortia, rather than single isolated species, as an optimal strategy for isolation of xenobiotics degraders. Also, we anticipate that future research should focus on the bioaugmentation with stabilized and tightly structured microbial degrading consortia as an effective solution for in situ bioremediation of sites polluted with recalcitrant compounds.

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Long-Term Persistence of Pesticides and TPs in Archived Agricultural Soil Samples and Comparison with Pesticide Application

Cited by 129 publications

References 58 publications

Under the radar: long-term perspectives on ecological changes in lakes

Under the radar: long-term perspectives on ecological changes in lakes

Modeling microbial communities from atrazine contaminated soils promotes the development of biostimulation solutions

Labour sharing promotes coexistence in atrazine degrading bacterial communities

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