Is Cr(VI) toxicity to Daphnia magna modified by food availability or algal exudates? The hypothesis of a specific chromium/algae/exudates interaction

Gorbi, Gessica; Corradi, Maria Grazia; Invidia, Marion; Rivara, Laura; Bassi, Maria

doi:10.1016/s0043-1354(01)00403-1

Cited by 29 publications

(10 citation statements)

References 32 publications

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“…A reduction of free Cu 2+ ions in the presence of humic substances is in agreement with other studies that investigated the effects of DOM on copper speciation and toxicity (Meador 1991;Kim et al 1999;Ma et al 1999;Lorenzo et al 2002;Gorbi et al 2002;Cao et al 2004;Nogueira et al 2005). It is known that copper-DOM complexes dominate copper speciation in natural waters even in the presence of excess of major competing cations, such as Ca 2+ (Reuter and Perdue 1977) and that the sequestering of copper ions from solution by coppercomplexing ligands leads to a reduction of free Cu 2+ ions concentration (Morel and Hering 1993).…”

Section: Discussionsupporting

confidence: 91%

“…Copper is a common environmental contaminant and usually presents high stability constants with natural dissolved organic materials (DOM), as discussed in Morel and Hering (1993). Therefore environmental factors which act upon metal speciation, among them pH, water hardness (Heijerick et al 2003), ionic strength (Cao et al 2004) and natural DOM Gorbi et al 2002;Nogueira et al 2005) affects metal bioavailability to aquatic organisms.…”

Section: Introductionmentioning

confidence: 99%

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The effects of humic substances on copper toxicity to Ceriodaphnia silvestrii Daday (Crustacea, Cladocera)

2008

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A major question in the field of ecotoxicology is how DOM affects copper accumulation and toxicity in planktonic organisms; copper acute toxicity and bioaccumulation in Ceriodaphnia silvestrii were investigated in the presence and absence of humic substances (HS) under controlled laboratory conditions. Copper was determined as free Cu2+ ions in the media and total copper in the animals; metal ion buffers were used for ion selective electrode calibration, extending the lower detection limit to 10(-11) mol l(-1). Groups of 20 adult females of similar sizes were exposed (24 h) to a range of nominal copper concentrations. Based on total added copper, LC50 was 4.4 x 10(-8) mol l(-1) without HS, whereas with 20 mg l(-1) HS, it was 25 times higher (1.1 x 10(-6) mol l(-1)). Based on free Cu2+ ions LC50 was statistically similar either with (2.8 x 10(-8) mol l(-1)) or without HS (3.3 x 10(-8 )mol l(-1)). The present results showed that natural DOM reduced copper toxicity and that free Cu2+ ions correlates to the bioavailable fraction to zooplankton. Nevertheless, copper bioaccumulation by C. silvestrii was similar either in the presence or absence of humic substances, suggesting that C. silvestrii regulates its body copper content up to 3.0 x 10(-8) mol l(-1) free Cu2+ ions in the media. The organisms were not able to deal with higher free Cu2+ ions concentrations in the media.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

The effects of humic substances on copper toxicity to Ceriodaphnia silvestrii Daday (Crustacea, Cladocera)

2008

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“…1.32 Â 10 5 1.29 Â 10 5 1.26 Â 10 5 1.30 Â 10 5 1.15 Â 10 5 1.02 Â 10 5 1.04 Â 10 5 1.07 Â 10 5 a -0.16 2.10 À 0.34 because these elements can be adsorbed to and taken up by algae before organisms ingest them through filtering processes (Rodgher and Gaeta Espíndola, 2008). Another study has shown that the toxicity of Cr(VI) to D. magna is significantly different when comparing exposed organisms to different food levels, making the metal more toxic in low food concentrations and less toxic as the concentration increases (Gorbi et al, 2002). In addition, and according to Koivisto et al (1992) cited by Gorbi et al (2002), different species of cladoceran showed less resistance to copper when exposed to low concentrations of food and suggested that the difference may be due to metal adsorption to the algae or to lower tolerance to copper when exposed to starvation conditions.…”

Section: Binary Combination Toxicity Testsmentioning

confidence: 99%

“…Another study has shown that the toxicity of Cr(VI) to D. magna is significantly different when comparing exposed organisms to different food levels, making the metal more toxic in low food concentrations and less toxic as the concentration increases (Gorbi et al, 2002). In addition, and according to Koivisto et al (1992) cited by Gorbi et al (2002), different species of cladoceran showed less resistance to copper when exposed to low concentrations of food and suggested that the difference may be due to metal adsorption to the algae or to lower tolerance to copper when exposed to starvation conditions. Therefore the organisms' fitness due to starvation or low food availability can also be considered crucial.…”

Section: Binary Combination Toxicity Testsmentioning

confidence: 99%

Changes of chemical chronic toxicity to Daphnia magna under different food regimes

Pavlaki

Ferreira

Soares

et al. 2014

Ecotoxicology and Environmental Safety

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“…These results suggest that dietary copper, at the levels used in this study, have stimulated C. cornuta's growth and reproduction. Other studies have also reported growth or reproduction stimulation as response of water or diet-borne copper exposure (Bossuyt and Janssen 2003;, and similar results were obtained for chromium (Gorbi and Corradi 1993;Gorbi et al 2002) and zinc (Muyssen and Janssen 2002;. Although physiological mechanisms underlying diet-borne metal toxicity has still to be better understood, De Schamphelaere and Janssen (2004) hypothesised that the stimulatory effects of copper on D. magna growth and reproduction could have been due to enhanced digestive enzyme activity, especially proteases.…”

Section: Discussionmentioning

confidence: 56%

Effects of Dietary Copper on Life-History Traits of a Tropical Freshwater Cladoceran

Gusso-Choueri

Choueri

Lombardi

et al. 2011

Arch Environ Contam Toxicol

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Life-history parameters of Ceriodaphnia cornuta (Cladocera: Daphniidae) fed on Pseudokirchneriella subcapitata (Chlorophyceae) exposed to different copper concentrations were investigated. C. cornuta individuals were reared in four treatments: (a) reconstituted water and non-contaminated algae (RW); (b) reconstituted water and copper-contaminated algae with either 1.28 × 10(-13) (10(-7)Cu) or (c) 1.93 × 10(-13) g Cu cell(-1) (10(-6)Cu); and (d) natural water from a local reservoir and non-contaminated algae (NW). Copper content in C. cornuta individuals increased as diet-borne exposure increased (RW < 10(-7)Cu < NW < 10(-6)Cu), except for NW individuals, which exhibited higher copper body burden than RW and 10(-7)Cu individuals, suggesting that some copper was available in the natural water. The results suggest that subacute levels of dietary copper stimulated C. cornuta's growth and reproduction, whereas organisms reared on reconstituted water showed nutritional deficiency. Depending on copper exposure concentration, either growth (lower Cu concentration) or reproduction (higher Cu concentration) was further stimulated, suggesting that an alteration of resource allocation is involved in diet-borne copper exposure. Because differences among treatments were only significantly different after day 12 of the experiment, our results reinforce that full life-cycle tests are more appropriate than the standard 7 day or three-brood chronic bioassays used to evaluate dietary copper effects at low, chronic copper inputs and that the use of standard test-organisms may not address site-specific situations for tropical environments.

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Is Cr(VI) toxicity to Daphnia magna modified by food availability or algal exudates? The hypothesis of a specific chromium/algae/exudates interaction

Cited by 29 publications

References 32 publications

The effects of humic substances on copper toxicity to Ceriodaphnia silvestrii Daday (Crustacea, Cladocera)

The effects of humic substances on copper toxicity to Ceriodaphnia silvestrii Daday (Crustacea, Cladocera)

Changes of chemical chronic toxicity to Daphnia magna under different food regimes

Effects of Dietary Copper on Life-History Traits of a Tropical Freshwater Cladoceran

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