Discriminating the pH toxicity to Poecilia reticulata Peters, 1859 in the Dunas Lake (Camaçari, BA, Brazil)

Araújo, Cristiano V.M.; Cohin-de-Pinho, Salomão J.; Chastinet, Carla B.A.; Santos, Jéssica Souza; Silva, Eduardo M. da

doi:10.1016/j.chemosphere.2008.05.061

Cited by 8 publications

(19 citation statements)

References 30 publications

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“…For toxicity tests, the median lethal time (LT 50 : time at which 50% of the test animals were dead) was determined by Probit Analysis. Considering that pH seemed to be the toxicity factor most determinant (Araújo et al, 2008a), to verify the presence of seasonal fluctuations and the interannual data trend, a moving average of the pH values was employed, as they are to identify trends in a given measurement and to eliminate unwanted fluctuations in time series analysis (Spiegel, 1981). In this procedure, a data subset was chosen from the data set collected over a given period.…”

Section: Discussionmentioning

confidence: 99%

“…Fish mortality was checked every 10 min in the first 3 h of the tests, 30 min of the third until the 10th h, and at longer time intervals in the following hours. Living animals were recorded and dead fish removed (da Silva et al 2000;Araújo et al 2006Araújo et al , 2008aAraújo et al , 2008b.…”

Section: Toxicity Assaysmentioning

confidence: 99%

“…The basic focus of the current review is the ecotoxicological studies that were conducted over eighteen years to monitor the reduction in toxicity and the role played by pH in producing the toxicity. Because the pH was determined to be the factor primarily responsible for the toxicity (Araújo et al, 2008a), we also decided to verify the existence of seasonal fluctuations and interannual trends of the pH data using moving average analysis.…”

Section: Introductionmentioning

confidence: 99%

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The natural rehabilitation of an anthropogenically acidified tropical Lake: Two decades of monitoring

et al. 2013

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The rehabilitation of a pond after approximately 20 years of strong acidified conditions due to industrial and domestic waste deposition in its catchment basin is reviewed. We describe in this study the acidification process that occurred in a tropical pond in Northeast Brazil (Dunas Lake), the rehabilitation plan for the pond and the subsequent monitoring conducted over two decades. After the contamination assessment by the late 80s, a rehabilitation plan was carried out in the early 90s, in which the contaminated soil and water have been removed and reduced, respectively. No further attempt to neutralize the water or any remediation has been carried out. A toxicity monitoring plan based on toxicity assays with the fish Poecilia reticulata was employed to verify the natural rehabilitation of the pond. The data on toxicity, pH, conductivity, sulphate and dissolved iron recorded from 1994 to 2010 were also compiled and discussed. The collected data in 2003 and 2004 indicated changes in water quality and from them complementary management actions, namely improvement in the containment plant, were conducted in 2005. Results for toxicity assays and pH results indicated interannual changes in the water quality similar to rainy-dry periods. Moving average approach using pH data clearly showed the recovery process of Dunas Lake as well as the importance of the containment plan to reduce the contamination. Finally, a summary of the recent situation after two decades of rehabilitation is provided.

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Section: Discussionmentioning

confidence: 99%

Section: Toxicity Assaysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The natural rehabilitation of an anthropogenically acidified tropical Lake: Two decades of monitoring

et al. 2013

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“…Young fry take $3-4 months to reach maturity. Guppies have previously been used in studies examining the impact of altered environmental conditions (Araujo et al, 2008;Fialho et al, 2008;Karayucel et al, 2008) pesticides (Baatrup and Junge, 2001;De Silva and Samayawardhena, 2002;Viran et al, 2003), heavy metals (Pierson, 1981;Khunyakari et al, 2001;Clearwater et al, 2002;Senatori et al, 2008), and estrogenic compounds (Toft and Baatrup, 2003;Nielsen and Baatrup, 2006). Predator responses in guppies differ between males and females, as females increase schooling, are more cautious (Magurran et al, 1992), and inspect the predator more often (Magurran and Nowak, 1991) than males.…”

Section: Introductionmentioning

confidence: 96%

Chronic exposure to environmentally-relevant concentrations of fluoxetine (Prozac) decreases survival, increases abnormal behaviors, and delays predator escape responses in guppies

Pelli

Connaughton

2015

Chemosphere

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“…The pH variation also affects the toxicity of nickel mainly due to metal speciation [13]. Since these effects multiply and affect the bioassay depending on the tested water quality [14,15], the basic evaluation of the influences of the pH level on the bioassay in specific lake is necessary.…”

Section: Introductionmentioning

confidence: 99%

Short-term Chronic Toxicity Tests on Acidified Lake Tazawa Using Responses of Three Trophic Levels of Aquatic Organisms

Kim

Masuda

Harada

et al. 2020

J. of Wat. & Envir. Tech.

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Lake Tazawa in Akita Prefecture, Japan, is an acidic lake caused by the inflow of low-pH water from Tamagawa Hot Springs. Because of this anthropogenic acidification, many indigenous fish species and aquatic ecosystem have perished. Although several counter-measures such as artificial neutralization have been implemented against the acidic waters of Tamagawa River flowing into Lake Tazawa, the pH level of the lake remained low. Therefore, a bioassay evaluation of the low-pH lake water is necessary for ecosystem restoration. In this study, short-term chronic toxicity tests were applied to observe biological responses of three trophic levels of aquatic organisms using water samples of Lake Tazawa. As a result, Lake Tazawa water has toxic effect on all tested aquatic organisms. Especially, the fish embryo/larvae was directly affected by low-pH water, while algae and crustaceans were affected not only by low pH but other factors such as fluorine ion and metals. In order to improve the water quality management of Lake Tazawa for ecosystem restoration, further efforts are needed to reduce multiple toxic substances in addition to the pH neutralization of lake water.

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Discriminating the pH toxicity to Poecilia reticulata Peters, 1859 in the Dunas Lake (Camaçari, BA, Brazil)

Cited by 8 publications

References 30 publications

The natural rehabilitation of an anthropogenically acidified tropical Lake: Two decades of monitoring

The natural rehabilitation of an anthropogenically acidified tropical Lake: Two decades of monitoring

Chronic exposure to environmentally-relevant concentrations of fluoxetine (Prozac) decreases survival, increases abnormal behaviors, and delays predator escape responses in guppies

Short-term Chronic Toxicity Tests on Acidified Lake Tazawa Using Responses of Three Trophic Levels of Aquatic Organisms

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