Physiological response to chlorination of the unicellular marine alga Dunaliella primolecta Butcher

Videau, Christiane; Khalanski, M.; Penot, Michel

doi:10.1016/0022-0981(80)90106-9

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…The dramatic increases in chlorophyll-specific phosphatase activities after the chlorine had been added differed from the results of Pratt et al ( 1988), who found significant declines in proteinspecific phosphatase activity at chlorine concentrations >0.002 mg!L. Where chlorine does inhibit nutrient uptake, the mechanism appears to be membrane mediated, perhaps due to enzyme inactivation, alteration to membrane permeability, or membrane disruption (Toetz et al 1977, Videau et al 1980. Leakage of nutrients from disrupted or oxidized cells may increase nutrient availability, thereby stimulating nutrient cycling in the periphyton mat.…”

Section: Treatment Effects On Resiliencementioning

confidence: 77%

“…Chlorine also can influence nutrient dynamics in systems. Videau et al (1980) reported that a chlorine concentration of 0.1 mg/L reduced phosphate uptake by phytoplankton 25%, but did not influence algal mor-'tality. At a chlorine concentration of 0.4 mg/L, inhibition of P uptake and mortality both increased, although surviving cells reestablished their pre-disturbance uptake rates within 30 h after dosing stopped.…”

Section: Comparative Effects Of Chlorinementioning

confidence: 97%

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Lotic Ecosystem Response to a Chlorine Disturbance

Steinman¹,

Mulholland²,

Palumbo³

et al. 1992

Ecological Applications

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The influence of repeated chlorine additions on the resistance and resilience of laboratory stream ecosystems was investigated. Prior to the disturbance, four treatments were imposed on eight laboratory streams in a 2 x 2 factorial design, resulting in two replicate streams per treatment. Treatments included two circulation regimes (once-through or 98% recirculated) and two levels of grazer density (1000 individuals/m or 0 individuals/m , using the snail Elimia clavaeformis). Resistance of periphyton biomass to an initial set of chlorine additions was greater in once-through than recirculated streams. Periphyton resistance following a second set of chlorine additions was greater in streams without snails compared to those with snails. This appeared to be a biomass-mediated response; the greater biomass levels in no-snail streams provided a larger buffer to the oxidizing action of chlorine. Resilience of most structural parameters and area-specific carbon-fixation rates was not influenced to a significant degree either by flow regime or snail density. Resilience of chlorophyll-specific carbon fixation and exoproteolytic activity (an index of microbial activity) was greater in recirculated streams compared to once-through streams, but only when snails were present. Over the entire experimental period (15 wk), most structural parameters and area-specific carbon fixation rates were significantly greater in (1) streams without snails compared to those with them and (2) streams with once-through circulation compared to those that were recirculated, but only for those streams with snails. Our chlorine additions appeared to have relatively little influence on snails, and snail growth over the experiment was significantly greater in once-through compared to recirculated streams. These data are consistent with other findings that total residual chlorine concentrations of <1.0 mg/L can significantly affect periphyton structure and function. However, nutrient cycling rates appeared to be little affected by the chlorine perturbation, which allowed recirculated systems to recover faster than predicted. The findings from this study suggest the periphyton mat physiognomy and integrity strongly influence system resistance (due to buffering capacity) and resilience (because of nutrient cycling).

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Section: Treatment Effects On Resiliencementioning

confidence: 77%

Section: Comparative Effects Of Chlorinementioning

confidence: 97%

Lotic Ecosystem Response to a Chlorine Disturbance

Steinman¹,

Mulholland²,

Palumbo³

et al. 1992

Ecological Applications

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“…These results are consistent with the Stenger-Kovács et al's (2013) study, which reports low abundances of the high profile guild at high conductivities and an increase of motile diatoms at high chloride levels. Among the different ions, chloride is an important parameter, as it can inhibit photosynthesis (Dionisio-Sese and Miyachi, 1992) and growth (Videau et al, 1980) in a number of diatoms.…”

Section: Discussionmentioning

confidence: 99%

Modelling diatom life forms and ecological guilds for river biomonitoring

Marcel¹,

Berthon²,

Castets³

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-Biomonitoring is central to the European Union's Water Framework Directive (WFD) and to the French water and aquatic environmental law, but most diatom indices do not separate different anthropogenic impacts. To address this gap, the effect of water chemistry on diatom ecological guilds and life forms was assessed in order to indicate stream perturbations. Generalised additive models (GAMs) were built on a large-scale data set of 1571 samples from the French monitoring network. The relationships between diatom ecological guild and life form metrics were investigated by Principal components analysis and the results predicted by GAMs. The models characterised eight chemical parameters that modified adaptive strategies (ecological guilds) and growth morphology (life forms). Total phosphorus, conductivity, nitrate and pH are the main influencing factors, followed by temperature, dissolved oxygen and organic matter. The findings confirm three groups of diatoms with different adaptive strategies: 1 -fast moving species, 2 -species growing close to the substrate and 3 -species extending to the surface layers of the biofilm. Thirteen diatom metrics displayed a variety of responses to different ranges of the eight chemical parameters. These metrics could be used to help to identify and quantify which chemical alterations are caused by polluted effluents in rivers.Keywords: benthic diatoms / ecological guilds / biological traits / biomonitoring / generalised additive model Résumé -Modélisation des formes de vie et guildes écologiques des diatomées pour la bioindication en rivières. La bioindication est centrale dans la directive cadre européenne sur l'eau et la loi française sur l'eau, mais la plupart des indices diatomiques ne séparent pas les différents impacts anthropiques. Pour combler ce manque, l'effet de la physico-chimie de l'eau sur les guildes écologiques et formes de vies des diatomées a été étudié pour indiquer des perturbations des cours d'eau. Des modèles additifs généralisés (GAMs) ont été construits sur un jeu de données de 1571 échantillons des réseaux de suivi des cours d'eau français. Les relations entre les métriques de guildes écologiques et formes de vie des diatomées ont été étudiées par une ACP et les résultats prédits par des GAMs. Les modèles ont caractérisé huit paramètres physico-chimiques qui modifient les stratégies adaptatives (guildes écologiques) et morphologies de croissance (formes de vie). Le phosphore total, la conductivité, les nitrates et le pH sont les facteurs les plus influents, suivis par la température, l'oxygène dissous et la matière organique. Les résultats confirment trois groupes de diatomées avec des stratégies adaptatives différentes : 1 -les espèces se déplaçant rapidement, 2 -les espèces proches du substrat et 3 -les espèces s'étendant vers la surface du biofilm. Quatorze métriques diatomiques ont montré une variété de réponses à différentes gammes de valeurs des huit paramètres physico-chimiques. Ces métriques pourraient être utilisées pour aider à identifier ...

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“…Studies carried out using individual diatom species (Videau et al, 1980) have demonstrated the negative effects of chlorine on diatom growth and development. The negative influence of chlorination on the production, biomass and community composition of periphytic algae has also been studied from both non-chlorinated (Napolitano et al, 1994) and chlorinated environments (Boston et al, 1991).…”

Section: Effects Of Ionic Strength and Conductivitymentioning

confidence: 99%

Influence of ionic strength and conductivity on benthic diatom communities in a tropical river (Monjolinho), São Carlos-SP, Brazil

Bere

Tundisi

2010

Hydrobiologia

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Benthic diatoms are important indicators of ecological conditions in lotic systems. The objective of this study was to elucidate the confounding effects of eutrophication, organic pollution and ionic strength and conductivity on benthic diatom communities. Benthic diatoms and water quality sampling was done at 10 sites during summer base flow period (2008 and 2009). Detrended correspondence analysis (DCA) and canonical correspondence analysis (CCA) were used to determine environmental gradients along which species vary with respect to ionic strength and conductivity and other environmental variables. Using variance partitioning, we assessed the individual importance of a set of environmental variables (eutrophication and organic pollution) versus ionic strength and conductivity on diatom community structure. The effects of ionic strength and conductivity and organic pollution, eutrophication and other environmental variables were integrated into overall resultant benthic diatom communities. Through partial CCA, we partitioned the variance in diatom data between two sets of exploratory variables, i.e. ionic strength and conductivity (26.9%); other variables, particularly eutrophication and organic pollution (23.0%); shared variance (11.3%) and unexplained variance (38.8%). Due to the interaction of the effects of ionic strength and conductivity and other variables in this study, laboratory experiments must be performed to confirm the observed effects of ionic strength and conductivity.

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Physiological response to chlorination of the unicellular marine alga Dunaliella primolecta Butcher

Cited by 4 publications

References 12 publications

Lotic Ecosystem Response to a Chlorine Disturbance

Lotic Ecosystem Response to a Chlorine Disturbance

Modelling diatom life forms and ecological guilds for river biomonitoring

Influence of ionic strength and conductivity on benthic diatom communities in a tropical river (Monjolinho), São Carlos-SP, Brazil

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