Efectos del herbicida Paraquat sobre el zooplancton

Abstract

EFFECTS OF PARAQUAT HERBICIDE ON ZOOPLANKTON. The effects of 0.1; 0.2; 0.4 and 0.8 mlPQ/L were analized on a zooplankton community, to determine the most sensitive species and to analize the occurence of physical abnormalities. A total of 40 taxa were determined. Paraquat affected significantly the zooplankton density but not the species richness. A progressive state of deformation of these organisms was also observed. Paraquat showed to be highly toxic for the zooplankton, so this herbicide should be strictly regulated in aquatic and terrestrial ecosystems.

Zooplankton community responses to the mixture of imazethapyr with imazapic and bispyribac-sodium herbicides under rice paddy water conditions

“…According to GAGNETEN (2002), herbicides can provoke zooplankton density reduction, especially among herbivorous crustaceans (Cladocers and Copepods), determine feeding decrease and algae community structure exchanges, presenting toxic effects.…”

The Impact of Herbicides on Benthic Organisms in Flooded Ricefields in Southern Brazil

“…This possible influence was also recorded by Reimche et al (2008), where the cladoceran assemblage showed a density variation caused by the stress of the application of this herbicide. The use of pesticides reduces the availability of food for the benthic macroinvertebrates and changes the structure of the algae community, and the toxic effect on these food resources may also be associated with this (Gagneten, 2002). Some studies have suggested the possibility that the toxic agents to non-target organisms, in the case of herbicides, are the adjuvants and the surfactants used in the commercial formulation of each pesticide (Tatum 2004;Kitulagodage et al, 2007).…”

Cladocers, Copepods and Rotifers in rice-fish culture handled with metsulfuron-methyl and azimsulfuron herbicides and carbofuran insecticide

“…Moreover, these organisms are frequently employed in ecotoxicologic assays since they are one of the most sensitive groups to the effects of toxic chemical products, as well as they are in a central position in the lentic food chain (HANAZATO, 2001;GAGNETEN, 2002).…”