Turbidity mitigates lead toxicity to cladocerans (Cladocera)

García-García, G.; Nandini, S.

doi:10.1007/s10646-006-0064-6

Cited by 20 publications

(14 citation statements)

References 20 publications

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“…The sensitivity of planktonic invertebrates towards heavy metals and pesticides depends on the physic-chemical conditions (Garcı´a-Garcı´ et al, 2006), the trophic status of the reservoir (Serra et al, 2010), the presence of detergent components (Sobrino-Figueroa, 2016), as well as on relat ion to the species (Wang et al, 2009;Sakamoto et al, 2010), their neonatal size (Vesela & Vijverberg, 2007), the number of single-celled algae (Sarma et al, 2000) which have mechanis ms for heavy metals detoxification (Macfie & Welbourn, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Krupa¹,

Barınova²,

Asylbekova³

et al. 2018

Turk. J. Fish. Aquat. Sci.

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The Shardara reservoir is located in southernmost Kazakhstan, in the zone of intensive farming and industrial development. Zooplankton and basic parameters of the environment have been studied in the summer of 2015. Zooplankton was represented by 60 species. The average abundance of the community amounted to 92.9 thous. specimens m -3 , with biomass of 966.0 mg m -3 . Copepods and rotifers dominated. The Shannon index values were equal to 2.24 bit specimen -1 and 1.23 bit mg -1 . The average individual mass of a specimen reached 0.0082 mg. Nonparametric and multivariate analysis of the data showed that macrophytes, nitrates, total nitrogen, organic polyphosphates, and copper favorably influenced Rotifera. Possible reasons for a positive relationship between quantitative indicators of Cladocera and zinc content are discussed. The main negative factors for Copepoda were organic polyphosphates, nitrites, total nitrogen, cadmium, and lead. Decrease in the Shannon index values under the influence of cadmium, ammonium, HCCH isomers is associated with increased dominance of Acanthocyclops trajani in the contaminated areas. There was no significant impact of heavy metals and pesticides on most of the structural indicators of zooplankton which can be due to the complex nature of contamination of the reservoir.

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Section: Introductionmentioning

confidence: 99%

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Krupa¹,

Barınova²,

Asylbekova³

et al. 2018

Turk. J. Fish. Aquat. Sci.

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“…From the demographic study conducted here and from literature, it appears that in M. macrocopa the reproductive output is more metal-sensitive than mortality (Kammenga and Laskowski 2000). When quantifying the direct effects of toxicants to zooplankton, the duration of exposure , García-García et al 2006). Survivorship curves of cladocerans under favorable conditions show a Type 1 pattern in which at younger age groups the mortality is relatively low, but increases with time, due to physiological aging (Krebs 1985).…”

Section: Discussionmentioning

confidence: 99%

Exposure time-dependent cadmium toxicity to Moina macrocopa (Cladocera): a life table demographic study

Gama-Flores

Sarma

2007

Aquat Ecol

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In this work, we quantified the life table demographic responses of Moina macrocopa daily exposed to three concentrations, 0, 0.08, 0.16, and 0.32 mg l À1 of CdCl 2 for 3, 6, 12, and 24 h. These cadmium levels represented 10-50% of the median lethal concentration known for M. macrocopa. In general, increase in CdCl 2 concentration and increase in the exposure time had a negative impact on the both survivorship and reproduction variables of M. macrocopa. The survivorship curves showed drastic mortality of M. macrocopa exposed for 24 h per day at all three concentrations used. The survival of animals was distinctly lower than in controls for the 3-h exposure at 0.08 mg l À1 of CdCl 2 . The cladocerans ceased to reproduce when exposed to 0.32 mg l À1 CdCl 2 for 6 h or longer. Depending on the heavy metal concentration and the duration of exposure, the average lifespan, net reproductive rate, generation time, and the rate of population increase varied from 3 to 10 days, 1 to 30 offspring female À1 , 4 to 8 days, and À0.20 to +0.59 day À1 , respectively. Even the lowest CdCl 2 concentration for an exposure time of 3 h had an adverse effect on M. macrocopa, which suggested the importance of including pulsed exposure times in ecotoxicological evaluations.

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“…Sediment levels were quantified gravimetrically using a Cahn 33 electrobalance and later converted into turbidity units (NTU) using a turbidimeter (Model Hanna, HI 93703). Previous work showed that sediment concentrations of 50 and 500 mg l À1 corresponded to 17 and 170 NTU, respectively (García-García et al, 2006).…”

Section: Methodsmentioning

confidence: 96%

“…Sediments may retain heavy metals by adsorption and thus lower levels in the water column. Consequently, turbidity levels in polluted waterbodies influence the toxicity of heavy metals to zooplankton (García-García et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Combined effects of sediment and lead (PbCl2) on the demography of Brachionus patulus (Rotifera: Brachionidae)

García-García¹,

Picazo-Paez

Nandini

2007

Hydrobiologia

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We studied the response of Brachionus patulus to different concentrations of the heavy metal Pb in the presence and absence of sediments. We conducted acute (LC 50 ) and chronic (life table demography and population growth) toxicity tests using sediment levels of 0, 30 and 280 mg l À1 (=0, 17 and 170 NTU) and Pb at 0, 0.06 and 0.6 mg l À1 . Experiments were conducted at 20 ± 1°C on a horizontal shaker and algal food (Chlorella vulgaris) was added at a density of 1.0 · 10 6 cells ml À1 . The median lethal concentration (LC 50 ± 95% Confidence intervals) of PbCl 2 for B. patulus was 6.15 ± 1.08 mg l À1 . Age-specific survivorship and fecundity curves showed increase in turbidity level resulted in decreased survival and offspring production of the rotifers. Increase in Pb concentration too had a negative effect on the survival and reproductive output of B. patulus. Statistically, average lifespan, life expectancy at birth, gross and net reproductive rates and the rate of population increase were all significantly influenced by the concentration of Pb, turbidity level as well as the interaction of Pb concentration · turbidity level. Rotifers exposed to 170 NTU did not grow regardless of the heavy metal concentration in the medium. Similarly, B. patulus exposed to 0.6 mg l À1 Pb did not survive beyond 10 days regardless of the turbidity level in the medium. The rate of population increase of B. patulus derived from the growth experiments was negative in all treatments containing Pb as low as 0.06 mg l À1 or turbidity level as low as 17 NTU. In treatments containing Pb or sediments, there existed no relation between the egg ratio and the population density.

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Turbidity mitigates lead toxicity to cladocerans (Cladocera)

Cited by 20 publications

References 20 publications

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Exposure time-dependent cadmium toxicity to Moina macrocopa (Cladocera): a life table demographic study

Combined effects of sediment and lead (PbCl2) on the demography of Brachionus patulus (Rotifera: Brachionidae)

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