A Critical Review of Procedures and Approaches Used for Assessing Pollution-Induced Community Tolerance (PICT) in Biotic Communities

Blanck, Hans

doi:10.1080/1080-700291905792

Cited by 290 publications

(221 citation statements)

References 72 publications

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“…In exposure scenario 2 (Fig. 2d) the biomass was seven times greater in the controls compared to that of sequentially exposed cultures at 145 h. This loss in biomass production might influence the competitiveness of species in surface water communities, e.g., periphyton (Blanck 2002). Single-pulse exposure (24 and 48 h) to the triazine metribuzin was shown to induce a change in species composition and a loss of biomass by different algal groups (Gustavson et al 2003).…”

Section: Resultsmentioning

confidence: 99%

Effect of Sequential Isoproturon Pulse Exposure on Scenedesmus vacuolatus

Vallotton

Eggen

Chèvre

2008

Arch Environ Contam Toxicol

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Aquatic organisms are typically exposed to fluctuating concentrations of herbicides in streams. To assess the effects on algae of repeated peak exposure to the herbicide isoproturon, we subjected the alga Scenedesmus vacuolatus to two sequential pulse exposure scenarios. Effects on growth and on the inhibition of the effective quantum yield of photosystem II (PSII) were measured. In the first scenario, algae were exposed to short, 5-h pulses at high isoproturon concentrations (400 and 1000 lg/l), each followed by a recovery period of 18 h, while the second scenario consisted of 22.5-h pulses at lower concentrations (60 and 120 lg/l), alternating with short recovery periods (1.5 h). In addition, any changes in the sensitivity of the algae to isoproturon following sequential pulses were examined by determining the growth rate-EC 50 prior to and following exposure. In both exposure scenarios, we found that algal growth and its effective quantum yield were systematically inhibited during the exposures and that these effects were reversible. Sequential pulses to isoproturon could be considered a sequence of independent events. Nevertheless, a consequence of inhibited growth during the repeated exposures is the cumulative decrease in biomass production. Furthermore, in the second scenario, when the sequence of long pulses began to approach a scenario of continuous exposure, a slight increase in the tolerance of the algae to isoproturon was observed. These findings indicated that sequential pulses do affect algae during each pulse exposure, even if algae recover between the exposures. These observations could support an improved risk assessment of fluctuating exposures to reversibly acting herbicides.

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Section: Resultsmentioning

confidence: 99%

Effect of Sequential Isoproturon Pulse Exposure on Scenedesmus vacuolatus

Vallotton

Eggen

Chèvre

2008

Arch Environ Contam Toxicol

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“…Induced Community Tolerance (PICT) approach was proposed by Blanck et al (2002). PICT 45 uses tolerance acquisition at the community level as a biological response to exposure to a toxic 46…”

Section: Introduction 39mentioning

confidence: 99%

Pollution-induced community tolerance of freshwater biofilms: measuring heterotrophic tolerance to Pb using an enzymatic toxicity test

Fechner¹,

Dufour²,

Gourlay-Francé³

2012

Ecotoxicology

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“…The yield of marine phytoplankton has been shown to decrease significantly when micro-algae are exposed to metal 2 solutions of zinc, copper and cadmium (Miao et al 2005). Disturbances can also change composition of assemblages, enabling more tolerant species to dominate benthic biofilms 4 (Blanck 2002), resulting in restored yield and primary production (Alsterberg et al 2007). …”

Section: Discussionmentioning

confidence: 99%

Effects of zinc on microalgal biofilms in intertidal and subtidal habitats

Mayer‐Pinto¹,

Coleman²,

Underwood³

et al. 2011

Biofouling

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(152 words)Biofilms are sensitive to environmental conditions. Impacts of contaminants on 2 assemblages are often investigated in laboratories or in meso-cosms. Such experiments are rarely representative of effects of contaminants on biofilms under natural conditions. Studies in 4 real field situations, with enough power to detect impacts, are necessary to develop better understanding of the effects of contaminants on ecological processes. Metals are a common 6 estuarine contaminant and can cause disturbances to the assemblages. Using a new technique to experimentally deliver contaminants to micro-algal assemblages, we tested hypotheses about 8 the effects of zinc on micro-algal biofilm growing on settlement panels in subtidal and intertidal habitats. Control panels deployed for one month in each habitat had significantly 10 greater amounts of biofilm than those exposed to zinc. After three months of deployment, results varied with location. The observed effects on the biofilm did not, however, cause 12 significant changes in the fouling assemblages that developed on the panels.

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A Critical Review of Procedures and Approaches Used for Assessing Pollution-Induced Community Tolerance (PICT) in Biotic Communities

Cited by 290 publications

References 72 publications

Effect of Sequential Isoproturon Pulse Exposure on Scenedesmus vacuolatus

Effect of Sequential Isoproturon Pulse Exposure on Scenedesmus vacuolatus

Pollution-induced community tolerance of freshwater biofilms: measuring heterotrophic tolerance to Pb using an enzymatic toxicity test

Effects of zinc on microalgal biofilms in intertidal and subtidal habitats

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