Effect of Medium Phosphate Levels on the Sensitivity of Selenastrum capricornutum to Chemicals

Kamaya, Yasushi; Takada, Toshio; Suzuki, Keijiro

doi:10.1007/s00128-004-0524-8

Cited by 21 publications

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“…While the increased effective concentrations reported here at low nutrient and triclosan exposure potentially indicate variable effects when exposure occurs over a nutrient gradient, the implications of physiological responses induced by nutrient stress on the effects of toxicant is unknown. This has been highlighted previously for autrophic co-exposure to nutrients and toxicants [35,68] and remains an important area for future research concerning nutrient-toxicant interactions.…”

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confidence: 74%

“…Similarly, growth rates obtained using standardized growth endpoints are also different across standardized media used for toxicity assessment [26]. Whereas variable toxicological effects of algae exposed to a multitude of toxicants across a nutrient gradient are widespread throughout the literature [34][35][36][37][38][39][40], the potential for nutrient-toxicant interaction for higher plants, particularly Lemna, has received comparatively less attention and has focused on metals [41][42][43]. Others have recognized this paucity of data and identified the need to understand potential interactive effects between nutrients and toxicant exposure to aquatic vascular plants [44].…”

Section: Introductionmentioning

confidence: 99%

“…Composition of algal nutrient media, particularly N and P, is previously reported to have significant influences on results derived from standardized assays [34][35][36]. This potentially leads to variable thresholds of adverse effect measures, and ultimately uncertainty, under different nutrient conditions experienced in the field.…”

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confidence: 99%

“…For example, depending on the combination of three green alga species, chemical, and growth media, Millington et al [36] showed that adverse effects were significantly different among but inconsistently linked to nutrient concentrations. Kamaya et al [35] showed a Selenastrum capricornutum 72-h protocatechuic acid median inhibition concentration to increase by a factor of 3.75 when P was decreased from 6.0 mM to 1.5 mM; amelioration of toxicity is reflected by the decreased numerical sensitivity (effect Table 5. Coefficients and model parameters for 7-d and 14-d Lemna gibba specific growth rate regression against triclosan for plants cultured and exposed to triclosan at control, low, and high phosphorus Nutrient modulation of triclosan toxicity in Lemna gibba Environ.…”

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Influence of nitrogen and phosphorus concentrations and ratios on Lemna gibba growth responses to triclosan in laboratory and stream mesocosm experiments

Fulton

Brain

Usenko

et al. 2009

Enviro Toxic and Chemistry

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Abstract-The effects of co-occurring nutrient and contaminant stressors are very likely to interact in aquatic systems, particularly at the level of primary producers. Site-specific nitrogen (N) and phosphorus (P) concentrations are often much lower and differ in relative availability than those used in nutrient-saturated laboratory assays for aquatic plants, which can introduce uncertainty in prospective ecological hazard and risk assessments. Because triclosan, an antimicrobial agent included in personal care products, potentially presents high relative risk among antimicrobial agents to aquatic plants and algae, we performed laboratory experiments with the model aquatic macrophyte Lemna gibba across a gradient of environmentally relevant N:P levels with and without triclosan coexposure. Frond numbers (7 d) were significantly higher in N:P treatments of 16 and 23 but were lower in N:P of 937 and 2,500 treatments relative to standardized control media (N:P 5 3). When triclosan co-exposure occurred at high nutrient concentrations, frond number median effective concentration values at N:P 0.75, 3, and 16 were more than twofold lower than triclosan median effective concentration values in low nutrient media N:P ratios. However, a triclosan median effective concentration for frond number was twofold lower at N:P of 2,500 than at other N:P ratios in low concentration media. Influences of P enrichment on triclosan toxicity to L. gibba were further explored during a 14-d outdoor experimental stream mesocosm study. Effects of 2.6 and 20.8 mg L 21 triclosan on L. gibba growth rates were more pronounced with increasing P treatment levels, which was generally consistent with our laboratory observations. Findings from these laboratory and field studies indicate that site-specific nutrient concentrations and ratios should be considered during assessments of primary producer responses to chemical stressors.

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confidence: 74%

Section: Introductionmentioning

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Influence of nitrogen and phosphorus concentrations and ratios on Lemna gibba growth responses to triclosan in laboratory and stream mesocosm experiments

Fulton

Brain

Usenko

et al. 2009

Enviro Toxic and Chemistry

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“…Quite another aspect of macronutrient interference is that surplus of metals (e.g. Zn) may induce P-deficiency in algae (Kamaya et al 2004, Guasch et al 2004, Rijstenbil et al 1998Paulsson et al 2000, Paulsson et al 2002.…”

Section: Data Compilation and Selection (Chapter 2)mentioning

confidence: 99%

Critical Review of "Metals Environmental Risk Assessment Guidance for Metals" (MERAG)

Parkman¹

2007

TemaNord

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Response of the green alga Oophila sp., a salamander endosymbiont, to a PSII‐inhibitor under laboratory conditions

Baxter

Brain

Rodríguez‐Gil

et al. 2014

Enviro Toxic and Chemistry

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In a rare example of autotroph-vertebrate endosymbiosis, eggs of the yellow-spotted salamander (Ambystoma maculatum) are colonized by a green alga (Oophila sp.) that significantly enhances salamander development. Previous studies have demonstrated the potential for impacts to the salamander embryo when growth of the algae is impaired by exposure to herbicides. To further investigate this relationship, the authors characterized the response of the symbiotic algae (Oophila sp.) alone to the photosystem II (PSII) inhibitor atrazine under controlled laboratory conditions. After extraction of the alga from A. maculatum eggs and optimization of culturing conditions, 4 toxicity assays (96 h each) were conducted. Recovery of the algal population was also assessed after a further 96 h in untreated media. Average median effective concentration (EC50) values of 123 µg L(-1) (PSII yield), 169 µg L(-1) (optical density), and 299 µg L(-1) (growth rate) were obtained after the 96-h exposure. Full recovery of exposed algal populations after 96 h in untreated media was observed for all endpoints, except for optical density at the greatest concentration tested (300 µg L(-1) ). Our results show that, under laboratory conditions, Oophila sp. is generally less sensitive to atrazine than standard test species. Although conditions of growth in standard toxicity tests are not identical to those in the natural environment, these results provide an understanding of the tolerance of this alga to PSII inhibitors as compared with other species.

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Effect of Medium Phosphate Levels on the Sensitivity of Selenastrum capricornutum to Chemicals

Cited by 21 publications

References 0 publications

Influence of nitrogen and phosphorus concentrations and ratios on Lemna gibba growth responses to triclosan in laboratory and stream mesocosm experiments

Influence of nitrogen and phosphorus concentrations and ratios on Lemna gibba growth responses to triclosan in laboratory and stream mesocosm experiments

Critical Review of "Metals Environmental Risk Assessment Guidance for Metals" (MERAG)

Response of the green alga Oophila sp., a salamander endosymbiont, to a PSII‐inhibitor under laboratory conditions

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