Longitudinal changes in microbial planktonic communities of a French river in relation to pesticide and nutrient inputs

Pesce, Stéphane; Fajon, Céline; Bardot, Corinne; Bonnemoy, Frédérique; Portelli, Christophe; Bohatier, Jacques

doi:10.1016/j.aquatox.2007.11.016

Cited by 65 publications

(51 citation statements)

References 33 publications

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“…Its intensive use in urban and agricultural areas during the recent decades has led to frequent surface water contamination, as confirmed by several recent studies highlighting the presence of diuron in various rivers draining agricultural watersheds (e.g. Pesce et al, 2008a, Schuler and Rand, 2008and Stork et al, 2008. There is now evidence from many experimental studies that environmentally realistic concentrations of diuron (i.e.…”

Section: Introductionmentioning

confidence: 79%

Freshwater sediment pesticide biodegradation potential as an ecological indicator of microbial recovery following a decrease in chronic pesticide exposure: A case study with the herbicide diuron

Pesce¹,

Margoum²,

Rouard³

et al. 2013

Ecological Indicators

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The aim of this study was to evaluate the use of freshwater sediment biodegradation potential as an ecological indicator for monitoring microbial recovery following a decrease in chronic pesticide exposure. For this purpose, a four-year case study (2008)(2009)(2010)(2011) was conducted in a small stream (Morcille river) long exposed to high diuron concentrations, increasing from upstream to downstream. Our results show that the ban on diuron in December 2008 resulted in a progressive decrease in its concentrations in the Morcille river over the survey period. However, diuron remained present in the water three years after the ban. The spatio-temporal variations in the sediment biodegradation potential were assessed by radiorespirometry using [ring-U-14C] diuron to estimate diuron mineralization potentials. Between autumn 2008 and autumn 2011, mean diuron mineralization percentage after 15 weeks of incubation decreased by 65% downstream and by 82% in the intermediate sector, and mean 10% diuron dissipation time values increased between 143% (downstream) and 210% (intermediate). Thus the decrease in the level of chronic diuron exposure in the river also caused a fall in sediment diuron-mineralizing capacities, revealing a corresponding recovery of microbial communities. Our results show that the use of freshwater sediment biodegradation potential may be useful for assessing microbial recovery after a decrease in chronic exposure to pollutants, opening prospects for developing a new class of ecological indicator to monitor the recovery of biological quality of water resources. In this way, the use of molecular approaches based on direct extraction of nucleic acids from environmental matrices and their subsequent analysis by PCR-based approaches to quantify the abundance of pesticide-degrading communities could represent a promising alternative. Highlights► We performed a 4-year survey in a river long exposed to diuron. ► The ban on diuron resulted in a gradual fall in its concentrations in the river. ► Sediment diuron biodegradation potential decreased throughout the survey. ► Degradation capacities can be an ecological indicator to gauge microbial recovery.

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Section: Introductionmentioning

confidence: 79%

Freshwater sediment pesticide biodegradation potential as an ecological indicator of microbial recovery following a decrease in chronic pesticide exposure: A case study with the herbicide diuron

Pesce¹,

Margoum²,

Rouard³

et al. 2013

Ecological Indicators

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“…Due to its high water solubility and extensive use, glyphosate exposure of non-target aquatic organisms is a growing concern (Tsui and Chu, 2003). While glyphosate has been detected in many aquatic systems it rarely exceeds a few micrograms per liter (Pesce et al, 2008(Pesce et al, , 2009), which could be related to its rapid degradation to its major metabolite, aminomethylphosphonic acid (AMPA) (Kolpin et al, 2006;Borggaard and Gimsing, 2008). In surface waters, concentrations ranging from 1 to 50 µg glyphosate l −1 and from 4 to 48.9 µg AMPA l −1 were reported in Europe (Horth and Blackmore, 2009), while in Canada, concentrations observed were ≤ 40.8 and ≤ 1.1 µg l −1 for glyphosate and AMPA, respectively (Giroux, 2015).…”

Section: Case Of Glyphosate and Temperaturementioning

confidence: 99%

Temperature and Light Modulation of Herbicide Toxicity on Algal and Cyanobacterial Physiology

Gomes

Juneau

2017

Front. Environ. Sci.

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HIGHLIGHTS• We reviewed the interaction between light, temperature and herbicides on algal and cyanobacterial physiology.• Temperature is the main factor affecting herbicide toxicity to algae and cyanobacteria.• Changes in light environment may modulate the effects of photosynthesis-targeting herbicides.Important interactions between climatic parameters and herbicide toxicity have been discussed in the literature. As climate changes are expected to influence the growth conditions of aquatic photosynthetic organisms over the next century by modifying the physicochemical parameters of the environment (such as temperature and incident light characteristics), the following questions arise: How will variations in climatic conditions influence herbicide toxicity in algae and cyanobacteria? Are these coupled effects on aquatic photosynthetic organism physiology antagonistic, additive, or synergistic?We discuss here the physiological responses of algae and cyanobacteria to the combined effects of environmental changes (temperature and light) and herbicide exposure. Both temperature and light are proposed to influence herbicide toxicity through acclimation processes that are mainly related to cell size and photosynthesis. Algal and cyanobacterial responses to interactions between light, temperature, and herbicides are species-specific, making it difficult today to establish a single model of how climate changes will affect toxicity of herbicides. Acclimation processes could assure the maintenance of primary production but total biodiversity should decrease in communities exposed to herbicides under changing temperature and light conditions. The inclusion of considerations on the impacts of environmental changes on toxicity of herbicides in water quality guidelines directed toward protecting aquatic life is now urgently needed.Keywords: environment, toxicity, hazardous, pollutants, algae, cyanobacteria Gomes and JuneauHerbicides/Climate Changes on PhytoplanktonGraphical Abstract | Changes in temperature and light conditions in water systems over the next century will drive physiological responses of algal and cyanobacterial community to herbicides, by antagonistic, additive, or synergic effects with these pollutants.

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“…Other studies have been reported that used TTGE from 16S PCR products to monitor pesticide toxicity on natural riverine microbial communities, using either pooled DNA extracts from replicates before PCR (Pesce et al, 2006), or no replication (Pesce et al, 2008). In our study, three or four replicates per treatment were extracted, amplified and separated.…”

Section: Roundup Impact On Prokaryote Communitiesmentioning

confidence: 99%

“…More recently, these methods were successfully applied to detect disturbances in microbial communities exposed to pollution (Petersen et al, 2004;Kostanjšek et al, 2005;Pesce et al, 2006Pesce et al, , 2008.…”

Section: Introductionmentioning

confidence: 99%

“…Toxicity effects on natural communities can be assessed in several ways: by sampling at different natural sites and/or times to look for pollution-related characteristics (Kostanjšek et al, 2005;Pesce et al, 2008); by sampling natural communities from the field and maintaining them in microcosms under controlled laboratory conditions (DeLorenzo et al, 1999b;Seguin et al, 2001); and, finally, by running studies using in situ microcosms. Recently, de la Broise and Palenik (2007) showed that such microcosms immersed in "average water column conditions", with partial water renewal, can be considered as good experimental models for natural nano-and picophytoplankton from coastal waters.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Roundup on the marine microbial community, as shown by an in situ microcosm experiment

et al. 2008

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The effects of the herbicide Roundup® (glyphosate) on natural marine microbial communities were assessed in a 7 day field experiment using microcosms. Bottles were maintained underwater at 6 m depth, and 10% of their water content was changed every other day.The comparison of control microcosms and surrounding surface water showed that the microcosm system tested here can be considered as representative of the natural surrounding environment. A Temporal Temperature Gradient gel Electrophoresis (TTGE) was run on 16S This study demonstrates that a disturbance was caused to the marine microbial community exposed to 1 µg L -1 Roundup concentration, a value typical of those reported in coastal waters during a run-off event.

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Longitudinal changes in microbial planktonic communities of a French river in relation to pesticide and nutrient inputs

Cited by 65 publications

References 33 publications

Freshwater sediment pesticide biodegradation potential as an ecological indicator of microbial recovery following a decrease in chronic pesticide exposure: A case study with the herbicide diuron

Freshwater sediment pesticide biodegradation potential as an ecological indicator of microbial recovery following a decrease in chronic pesticide exposure: A case study with the herbicide diuron

Temperature and Light Modulation of Herbicide Toxicity on Algal and Cyanobacterial Physiology

Impact of Roundup on the marine microbial community, as shown by an in situ microcosm experiment

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