KOPPRIO German Adolfo
congresos y reuniones científicas
Management of brackish water resources in semiarid grasslands of Argentina: Past environmental changes and future perspectives of a highly productive coastal lake.
KOPPRIO, G.; LARA, R. J.; FREIJE, R. H.; KATTNER, G.; HOFFMEYER, M. S.; POPOVICH, C. A.
Conferencia; The Fourth International Conference of the Egyptian Society for Environmental Sciences. Impacts of Climate Change on Natural Resources.; 2009
DAAD, ACGSS, ESES, FSSCU
Since 1970 several pampean lakes have experienced extreme floods related with El Niño phenomenon. Generally, inundations damaged substantially agriculture and tourism. However, an unexpected positive effect occurred in the Chasicó lake due to the decrease in salinity: the commercial fish pejerrey (Odontesthes bonariensis) found optimum salinities that favored an exceptional growth. The fish biomass exceeded typical values of protein production by cattle in the humid pampa of 80 kg/ha/yr. The main objectives of this study are to understand the links between current hydrological oscillations, nutrient cycles, plankton and fish dynamics of this lake, and to contribute to the prediction of its future condition in a changing environment. After three decades of rainfall above historical average, an extremely dry period associated with La Niña event is now sensibly changing the hydrological system. On-going climate change can induce stronger and/or extended ENSO events resulting in droughts (La Niña) or floods (El Niño) in coastal ecosystems of the southwest Atlantic. Besides the risks of salinity and temperature oscillations for pejerrey growth and sexual differentiation, Chasicó and other lakes in the semiarid region are eutrophic and periodically suffer mass fish mortalities due to toxic blooms, which are expected to intensify due to global warming.