NDLI: Acute and chronic effects of sodium and potassium on the tropical freshwater cladoceran Pseudosida ramosa

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Acute and chronic effects of sodium and potassium on the tropical freshwater cladoceran Pseudosida ramosa

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Freitas, Emanuela Cristina Rocha, Odete
Description	Country affiliation: Brazil Author Affiliation: Freitas EC ( Department of Ecology and Evolutionary Biology, Federal University of São Carlos, Rodovia Washington Luis, km 235, São Carlos, SP, CEP 13565-905, Brazil. emanuelacfreitas@gmail.com)
Abstract	In this study, the toxicities of sodium and potassium to the tropical freshwater cladoceran Pseudosida ramosa were assessed. Acute toxicity tests on this species showed that the 48-h $LC_{50}$ of $Na^{+}$ was $556 mg l^{−1},$ while that of $K^{+}$ was $17.7 mg l^{−1}.$ Long-term exposure of female P. ramosa to sodium reduced the total number of survivors from 10 to 6 at a concentration of $249 mg l^{−1},$ 21-day fecundity from 20.4 to 14.3 eggs $female^{−1}$ at concentrations ranging from 72 to $249 mg l^{−1},$ 21-day fertility from 20.1 to 6.5 neonates $female^{−1}$ at concentrations ranging from 25 to $249 mg l^{−1}.$ Furthermore, fecundity of each brood from the second to the fifth was significantly lower at $249 mg l^{−1}$ and fertility of each brood from the first to the fifth at concentrations ranging from 25 to $249 mg l^{−1}.$ A significant decrease in fertility was associated with an increase in the number of aborted eggs. Long-term exposure to potassium decreased the 21-day fecundity of P. ramosa from 14.2 to 10.8 eggs $female^{−1}$ at a concentration of $11 mg l^{−1}$ and fertility (fourth brood only) at 6.2 and $11 mg l^{−1}.$ Tropical reservoirs located near areas where the soil is overloaded with fertilizers and ferti-irrigation with vinasse already show concentrations of $Na^{+}$ and $K^{+}$ very close to those producing sub-lethal long-term effects on P. ramosa. A possible consequence is that organisms of the aquatic biota cannot adapt and freshwater taxa may become locally extinct, transferring dominance to salt-tolerant taxa.
File Format	HTM / HTML
ISSN	09639292
Issue Number	1
Volume Number	20
e-ISSN	15733017
Journal	Ecotoxicology
Language	English
Publisher	Springer
Publisher Date	2011-01-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Ecology Discipline Environmental Health Discipline Toxicology Cladocera Drug Effects Fresh Water Chemistry Potassium Toxicity Sodium Water Pollutants Animals Female Fertility Male Time Factors Toxicity Tests, Acute Tropical Climate Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Medicine Toxicology Management, Monitoring, Policy and Law

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