Functional recovery of biofilm bacterial communities after copper exposure

Boivin, Marie-Elène Y.; Massieux, Boris; Breure, A.M.; Greve, Gerdit D.; Rutgers, Michiel; Admiraal, Wim

doi:10.1016/j.envpol.2005.07.014

Cited by 31 publications

(20 citation statements)

References 26 publications

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“…Copper concentrations in biofilms also decreased significantly, leading to a release of Cu in water as shown by the increase in dissolved Cu concentrations between each water renewal together with biomass accrual. Boivin et al (2006) observed similar Cu partitioning and exchange between water and biofilms in another recovery study. In our work, most of the release was due to a decrease in the external fraction of Cu, which is more easily desorbable than the fraction that is sequestered intracellularly.…”

Section: Changes In Cu Exposure Conditions During the Recovery Periodmentioning

confidence: 59%

“…Boivin et al (2006) also recorded high Cu concentrations after 28 days of recovery in biofilms previously exposed to Cu, despite weekly water change. Dissipation would probably have been faster in an open experimental system or in a non-polluted river section, but a translocation experiment by Dorigo et al (2010a) showed that a 9-week recovery period was not sufficient for complete biofilm Cu removal.…”

Section: Changes In Cu Exposure Conditions During the Recovery Periodmentioning

confidence: 99%

“…These include individual acclimation (physiological or genetic adaptation) and loss of sensitive species. This increase in Cu tolerance following a chronic exposure was previously described in experimental studies considering phototrophic ( [Soldo and Behra, 2000] and ) and heterotrophic ( [Boivin et al, 2006] and ) activities as microbial endpoints.…”

Section: Introductionmentioning

confidence: 99%

“…Despite an increasing number of studies on the impact of toxicants on biofilm microbial communities, knowledge on their recovery dynamics following a decrease in exposure levels remains scarce (e.g. [Boivin et al, 2006] , [Dorigo et al, 2010a] , [Dorigo et al, 2010b] , [Morin et al, 2010] and [Rotter et al, 2011] ).…”

Section: Introductionmentioning

confidence: 99%

“…Chronic exposure to Cu is known to result in structural and functional effects in autotrophic and heterotrophic biofilm microbial communities ( [Soldo and Behra, 2000] , [Boivin et al, 2006] and [Serra and Guasch, 2009] ). The resulting changes in microbial communities generally lead to an increase in community tolerance to Cu, in line with the pollution-induced community tolerance (PICT) concept introduced by Blanck et al (1988).…”

Section: Introductionmentioning

confidence: 99%

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Structural and functional recovery of microbial biofilms after a decrease in copper exposure: Influence of the presence of pristine communities

Lambert¹,

Morin²,

Artigas³

et al. 2012

Aquatic Toxicology

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The present study aimed at assessing the recovery of phototrophic and heterotrophic biofilm communities after a decrease in copper exposure. An original experiment was designed to evaluate the possible influence of non-exposed (i.e. pristine) communities (e.g. via immigration processes) in recovery dynamics. Laboratory channels were used to study the structural and functional changes in microbial communities after a 4-week Cu exposure period in the presence and absence of pristine biofilms. When pristine biofilms were present, phototrophic communities recovered within 6 weeks, both in terms of biomass, structure and photosynthetic activity. Recovery processes were also detected using the PICT approach. In contrast, in the absence of pristine communities, all of the Cu-induced changes recorded in the phototrophic communities remained throughout the recovery period.Regardless of the presence or absence of pristine biofilms, the decrease in Cu exposure did not abolish Cu-induced changes in bacterial community structure, whereas functional recovery (based on beta-glucosidase activity) was complete in both recovery contexts.These results revealed that microbial community response to a decrease in Cu exposure differs between phototrophic and heterotrophic communities. The presence of pristine communities greatly influences the structural and functional recovery of phototrophic communities, suggesting an important role of microbial immigration processes, but have far less influence on the recovery trajectory of heterotrophic communities. Highlights► We tested the influence of microbial immigration in biofilm recovery after a Cu exposure.► Recovery dynamics differed between phototrophic and heterotrophic communities.► Microbial immigration enhanced the recovery of phototrophic communities.► Heterotrophic community recovery slightly depended on microbial immigration processes.

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Section: Changes In Cu Exposure Conditions During the Recovery Periodmentioning

confidence: 59%

Section: Changes In Cu Exposure Conditions During the Recovery Periodmentioning

confidence: 99%