INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Impact of interaction between Limnoperna fortunei and Roundup Max ® on freshwater phytoplankton: An in situ approach in Salto Grande reservoir (Argentina)
Autor/es:
ESPINOSA, MARIELA SOLEDAD; DE STEFANO, LUCÍA GABRIELA; PIZARRO, HAYDÉE; VINOCUR, ALICIA; CATALDO, DANIEL; BORDET, FACUNDO; GATTÁS, FLORENCIA; ESPINOSA, MARIELA SOLEDAD; DE STEFANO, LUCÍA GABRIELA; PIZARRO, HAYDÉE; VINOCUR, ALICIA; CATALDO, DANIEL; BORDET, FACUNDO; GATTÁS, FLORENCIA
Revista:
CHEMOSPHERE
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2018 vol. 209 p. 748 - 757
ISSN:
0045-6535
Resumen:
The joint impact of the glyphosate-based commercial formulation Roundup Max® and the invasivemussel Limnoperna fortunei on phytoplankton and water quality was assessed in Salto Grande reservoir, ascenario were both stressors coexist. We performed an in situ mesocosm approach, through a 7-dayexperiment using 400-L enclosures. The following treatments were applied by triplicate: addition of250 mussels (M); addition of 5mg L1 of active ingredient (a.i.) in Roundup Max® (R); addition of 250mussels and 5mg L1 of a.i. in Roundup Max® (MR), and controls, without any addition (C). R showedhigher total phosphorus (TP) and ammonium nitrogen (NeNH4þ) concentrations due to the herbicideinput, and a significant increase in algal abundance, biovolume and chlorophyll a levels (Chl-a). In Mmussels grazed on phytoplankton, which resulted in subsequent phosphates (SRP) release. A decrease inspecies diversity was observed in R and M with respect to C. In MR, there were higher TP and NeNH4þconcentrations, a decrease in biovolume, an antagonistic effect on Chl-a and a synergistic effect onphytoplankton abundance. Species diversity and evenness showed a significant decrease due to theexplosive growth of a small and opportunistic Chlorophyta, Spermatozopsis exsultans. The dominance ofthis species may be due to negative selectivity for S. exsultans and/or release of potential competitors byL. fortunei, and to the input of nutrients by Roundup Max® and/or removal of competitors by its toxicity.