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

Gomes, Marcelo Pedrosa; Juneau, Philippe

doi:10.3389/fenvs.2017.00050

Cited by 43 publications

(24 citation statements)

References 120 publications

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“…It is well known that temperature and incident light are two of the main environmental factors able to modulate primary production (Dodds et al, 1996;Gomes & Juneau, 2017;Staehr & Sand-Jensen, 2006). In temperate regions, both factors change seasonally, subjecting primary production to seasonal variations.…”

Section: Introductionmentioning

confidence: 99%

Light and temperature influence on diuron bioaccumulation and toxicity in biofilms

et al. 2020

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Variations of temperature and photoperiod throughout different seasons can affect aquatic communities such as biofilms. Biofilms, generally present at the base of trophic chains in freshwaters, are also subject to organic contamination, and are especially affected by herbicides.Many studies have investigated the effect and interactions of herbicides and environmental factors on biofilms, but never with a toxicokinetic point of view.The objective of this study was to assess structural and functional changes in biofilms exposed to diuron, and to link them with contaminant accumulation, under the influence of temperature and light variations. To this aim, biofilms were exposed to all possible combinations of three concentrations (0, 5 and 50 µg.L -1 ) of diuron, two temperatures (10 and 26°C), and two light/dark photoperiods (16/8, 10/14), for durations of 0, 1 and 3 days. Diuron accumulation in biofilms was quantified and structural descriptors (protein and polysaccharide contents, dry weight) and functional endpoints (photosynthetic and enzymatic activities) were analysed.The results obtained mainly highlighted the influence of temperature on diuron bioaccumulation and the associated toxic impact on biofilms. Bioaccumulation in biofilms exposed during three days at 10°C, at the highest diuron concentration, was in average 1.4 times higher than bioaccumulation on biofilms exposed to 26°C. Accordingly, the photosynthetic yield was more inhibited at lower than at higher temperatures. Temperature was also the highest impacting factor for metabolism regulation;for example, at 26°C after three days of exposure, polysaccharide production was boosted under both photoperiods tested.

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Section: Introductionmentioning

confidence: 99%

Light and temperature influence on diuron bioaccumulation and toxicity in biofilms

et al. 2020

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“…The bioavailable concentration is defined as the concentration that is freely available for uptake, crossing an organism's cellular membrane from the medium the organism inhabits at a given time (Semple et al 2004). The bioavailability of herbicides depends on the molecular characteristics of the herbicide and on environmental conditions (Landrum et al 1996;Delle Site 2001), but is also greatly influenced by the test species and their physiology (Gomes and Juneau 2017). Furthermore, after entering the environment, bioavailability of herbicides is altered by the prevailing environmental conditions of the soil, surface waters and sediments (Delle Site 2001;Semple et al 2013).…”

Section: Bioavailability Of Herbicides To Aquatic Primary Producersmentioning

confidence: 99%

“…In addition to cell characteristics, also environmental conditions influence the uptake of herbicides by aquatic primary producers. Temperature and light conditions alter the uptake of herbicides by phytoplankton species mainly through changes in cell size and photosynthetic activity, although responses to interactions between light, temperature and herbicides are species-specific (Gomes and Juneau 2017). Moreover, the uptake of herbicides by phytoplankton species can occur extremely rapid, with nearly 90% of the total uptake occurring within the first hour of exposure of the algae (Tang et al 1998), indicating that short pulse exposures occurring after runoff or spill events can rapidly affect phytoplankton communities.…”

Section: Uptake Of Herbicides By Aquatic Primary Producersmentioning

confidence: 99%

“…In this way, there is an interaction between the influence of exposure of aquatic primary producers to herbicides and the removal of herbicides by these species. Differences in sensitivity and mechanisms to deal with herbicides can therefore influence overall species composition in areas prone to herbicide exposure (Gomes and Juneau 2017).…”

Section: Uptake Of Herbicides By Aquatic Primary Producersmentioning

confidence: 99%

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Herbicide Exposure and Toxicity to Aquatic Primary Producers

Vonk

Kraak

2020

Reviews of Environmental Contamination and Toxicology

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The aim of the present review was to give an overview of the current state of science concerning herbicide exposure and toxicity to aquatic primary producers. To this end we assessed the open literature, revealing the widespread presence of (mixtures of) herbicides, inevitably leading to the exposure of non-target primary producers. Yet, herbicide concentrations show strong temporal and spatial variations. Concerning herbicide toxicity, it was concluded that the most sensitive as well as the least sensitive species differed per herbicide and that the observed effect concentrations for some herbicides were rather independent from the exposure time. More extensive ecotoxicity testing is required, especially considering macrophytes and marine herbicide toxicity. Hence, it was concluded that the largest knowledge gap concerns the effects of sediment-associated herbicides on primary producers in the marine/estuarine environment. Generally, there is no actual risk of waterborne herbicides to aquatic primary producers. Still, median concentrations of atrazine and especially of diuron measured in China, the USA and Europe represented moderate risks for primary producers. Maximum concentrations due to misuse and accidents may even cause the exceedance of almost 60% of the effect concentrations plotted in SSDs. Using bioassays to determine the effect of contaminated water and sediment and to identify the herbicides of concern is a promising addition to chemical analysis, especially for the photosynthesis-inhibiting herbicides using photosynthesis as endpoint in the bioassays. This review concluded that to come to a reliable herbicide hazard and risk assessment, an extensive catch-up must be made concerning macrophytes, the marine environment and especially sediment as overlooked and understudied environmental compartments.

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“…Plants are capable of acclimation, whereby they adjust to environmental changes and maintain adequate levels of performance. Under low light, cell components are adjusted to improve light absorption efficiency (Gomes and Juneau, 2017). Its high concentrations of chlorophyll a and b suggest that weedy rice generally has higher photosynthetic capacity than cultivated rice (Dai et al, 2016), thus justifying its greater competitive ability under restricted light.…”

Section: (B) (A) (C) (D)mentioning

confidence: 99%

Relative Competitiveness Between Cultivated and Weedy Rice under Full and Low Light

et al. 2020

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ABSTRACT: Cultivated and weedy rice biotypes exhibit morphophysiological variations under low light, affecting competition between plants. The aim of this study was to assess relative competitiveness between cultivated and weedy rice under full and low light. Three experiments were conducted in a greenhouse, using a completely randomized design with four repetitions. The treatments in the experiment I were arranged in additive series while in the experiments II and III treatments were arranged in replacement series. Experiments II and III were carried out concomitantly to assess coexistence between the rice cultivar and weedy rice. The treatments consisted of different plants proportions: 100:0 (cultivated rice monoculture), 75:25, 50:50, 25:75 and 0:100 (weedy rice monoculture), keeping the total plant population obtained in experiment I (240 plants m-2) constant. Experiment II was conducted with full solar radiation and III under 50% light. The variables analyzed were shoot dry weight and plant height, 35 days after emergence (DAE). Competition among plants was evaluated via graphs and by interpreting competition indices. Concerning shoot dry weight, mutual losses were recorded between competitors, whereas equal competition for resources was observed for plant height. Weedy rice was more competitive than cultivated rice regardless of the light environment assessed, indicating the need for integrated methods to control this weed.

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

Cited by 43 publications

References 120 publications

Light and temperature influence on diuron bioaccumulation and toxicity in biofilms

Light and temperature influence on diuron bioaccumulation and toxicity in biofilms

Herbicide Exposure and Toxicity to Aquatic Primary Producers

Relative Competitiveness Between Cultivated and Weedy Rice under Full and Low Light

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