Cell surface area as a major parameter in the uptake of cadmium by unicellular green microalgae

Khoshmanesh, Aazam; Lawson, F.; Prince, I.G.

doi:10.1016/s1385-8947(96)03091-4

Cited by 33 publications

(13 citation statements)

References 2 publications

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“…Small algae achieve higher rates of photosynthesis and have higher specific growth rates, and, also a faster transport of nutrients per unit of biomass (Hein et al, 1995). The smallest microalgae, having the largest surface to volume ratios, are often the most effective in sequestering metals (Khoshmanesh et al, 1997); for e.g. small cells (with large surface area to volume ratios) are reported to be more sensitive to copper than larger species (Quigg et al, 2006).…”

Section: Size and Volume Of Microalgaementioning

confidence: 99%

Microalgae – A promising tool for heavy metal remediation

Kumar

Dahms‬

Won

et al. 2015

Ecotoxicology and Environmental Safety

673

115

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Section: Size and Volume Of Microalgaementioning

confidence: 99%

Microalgae – A promising tool for heavy metal remediation

Kumar

Dahms‬

Won

et al. 2015

Ecotoxicology and Environmental Safety

673

115

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“…The tube-forming life-form is a type of colonial lifeform: diatoms live in a protective mucous substance within which they can move freely. The pioneer diatoms are able to colonise bare substrates faster than other species, probably because they are generally small in size and so their exposure to toxic substances is minimal, as is their assimilation (Koshmanesh et al, 1997). Table 2 shows the taxa composition of the different life-forms, one taxon may appear in more than one life-form group.…”

Section: Diatoms and Biological Traits Life-forms And Size Classesmentioning

confidence: 99%

Using diatom life-forms and ecological guilds to assess organic pollution and trophic level in rivers: a case study of rivers in south-eastern France

Berthon¹,

Bouchez²,

Rimet³

2011

Hydrobiologia

181

130

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The European Union's Water Framework Directive has set a target of achieving good ecological status for all aquatic environments in Europe by 2015. In order to determine the quality of aquatic environments, biological indicators such as diatoms are often used. However, biotic diatom indices can be difficult and time consuming to use because of complexity of species determination. We investigated whether the biological traits of diatoms in rivers (life-forms, size classes and ecological guilds) could be used to assess organic pollution and trophic level. We worked on a data set comprising 315 diatom species, determined at 328 river stations of south-east France and a variety of parameters. The abundances of some biological traits differed significantly between the different organic pollution and trophic levels, particularly stalked diatoms, and the motile and low-profile guilds.

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“…Previous studies suggested that communities under chemical stress would tend to be dominated by small species (e.g., E. minima) (Pérès et al 1996;Ivorra et al 1999). Khoshmanesh et al (1997) showed that smaller algal cells have proportionally larger surface area and more sites for metal binding than larger algal cells, allowing them to be more tolerant to high concentrations of metals. Our results confirmed these observations, and showed that Zn contamination exerted a selection pressure proportional to both exposure level and biofilm age on the diatom communities, leading to the partial proliferation of some tolerant species in the low and intermediately-polluted sites and total elimination of the sensitive species in the high-pollution sites.…”

Section: Effects Of Zn Contamination On the Induced Tolerance Of The mentioning

confidence: 99%

In situ spatio-temporal changes in pollution-induced community tolerance to zinc in autotrophic and heterotrophic biofilm communities

Tlili¹,

Corcoll

Bonet

et al. 2011

Ecotoxicology

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Pollution-induced community tolerance (PICT) uses increased tolerance in populations at contaminated sites as an indicator of contaminant effects. However, given the broad structural and functional complexity that characterizes biological communities, the acquisition of PICT could vary with (i) target community, (ii) intensity of toxicant exposure, (iii) the species succession stage, and (iv) the physicochemical characteristics of the studied site. To assess the spatio-temporal changes of zinc-induced tolerance in fluvial biofilm communities, we conducted an in situ study in Osor River (North-East Catalonia, Spain), which has zinc contamination. Biofilms were developed for 5 weeks in a non-metal-polluted site, and were then transferred to different sites in Osor River with different levels of zinc contamination. The spatio-temporal changes of biofilm PICT to zinc was determined using photosynthetic activity bioassays and respiration-induced aerobic bioassays at T(0), and at 1, 3 and 5 weeks of exposure. We also performed physicochemical characterization of the sites, taxonomic analysis of diatoms, bacterial and fungal diversity and profiled pigments of phototrophic communities. We used multivariate ordination to analyze results. In addition to natural species succession, the intensity of metal pollution exerted structural pressure by selecting the most metal-tolerant species, but differently depending on the type of biofilm. Zn-tolerance values indicated that exposure to high levels of zinc had effects that were similar to a longer exposure to lower levels of zinc.

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Cell surface area as a major parameter in the uptake of cadmium by unicellular green microalgae

Cited by 33 publications

References 2 publications

Microalgae – A promising tool for heavy metal remediation

Microalgae – A promising tool for heavy metal remediation

Using diatom life-forms and ecological guilds to assess organic pollution and trophic level in rivers: a case study of rivers in south-eastern France

In situ spatio-temporal changes in pollution-induced community tolerance to zinc in autotrophic and heterotrophic biofilm communities

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