info:eu-repo/semantics/article
Effects of glyphosate formulations on the population dynamics of two freshwater cladoceran species
Fecha
2018-09Registro en:
Reno, Ulises; Doyle, Santiago Raúl; Momo, Fernando Roberto; Regaldo, Luciana María; Gagneten, Ana María; Effects of glyphosate formulations on the population dynamics of two freshwater cladoceran species; Springer; Ecotoxicology; 27; 7; 9-2018; 784-793
0963-9292
1573-3017
CONICET Digital
CONICET
Autor
Reno, Ulises
Doyle, Santiago Raúl
Momo, Fernando Roberto
Regaldo, Luciana María
Gagneten, Ana María
Resumen
The general objective of this work is to experimentally assess the effects of acute glyphosate pollution on two freshwater cladoceran species (Daphnia magna and Ceriodaphnia dubia) and to use this information to predict the population dynamics and the potential for recovery of exposed organisms. Five to six concentrations of four formulations of glyphosate (4-Gly) (Eskoba®, Panzer Gold®, Roundup Ultramax® and Sulfosato Touchdown®) were evaluated in both cladoceran species through acute tests and 15-day recovery tests in order to estimate the population dynamics of microcrustaceans. The endpoints of the recovery test were: survival, growth (number of molts), fecundity, and the intrinsic population growth rate (r). A matrix population model (MPM) was applied to r of the survivor individuals of the acute tests, followed by a Monte Carlo simulation study. Among the 4-Gly tested, Sulfosato Touchdown® was the one that showed higher toxicity, and C. dubia was the most sensitive species. The Monte Carlo simulation study showed an average value of λ always <1 for D. magna, indicating that its populations would not be able to survive under natural environmental conditions after an acute Gly exposure between 0.25 and 35 a.e. mg L−1. The average value of λ for C. dubia was also <1 after exposure to Roundup Ultramax®: 1.30 and 1.20 for 1.21 and 2.5 mg a.e. L−1,respectively. The combined methodology—recovery tests and the later analysis through MPM with a Monte Carlo simulation study—is proposed to integrate key demographic parameters and predict the possible fate of microcrustacean populations after being exposed to acute 4-Gly contamination events.