Pollution of the ‘el carpincho’ pond (pampasic region, Argentina) and its effects on plankton and fish communities
1973; Elsevier BV; Volume: 4; Issue: 1 Linguagem: Inglês
10.1016/0013-9327(73)90029-3
ISSN1878-2450
Autores Tópico(s)Fish biology, ecology, and behavior
ResumoA pond in the Southern Pampasic region of Argentina, ‘El Carpincho’, with highly developed fishing and other recreational activities, has been polluted since 1969 by the effluents from three industrial plants. The effects of this on the plankton and fish communities were investigated by the Institute of Limnology at La Plata University. Changes in the Mg/Ca ratio caused a reduction in the density of zooplankton, and in the numbers of the freshwater argentine silverside fish (Basilichthys bonariensis). On the other hand, an explosive increase in catfish (Parapimelodus valenciennesi) was observed. The diversity index for the relative composition of the fish fauna rose from 0·3093 in 1966 to 1·9384 in 1970. Efforts to rehabilitate the pond are being made.
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