期刊
RIVER RESEARCH AND APPLICATIONS
卷 33, 期 3, 页码 353-363出版社
WILEY
DOI: 10.1002/rra.3100
关键词
climatic fluctuations; historic hydrologic fluctuations; flow regime; freshwater fisheries; Middle Parana River (Argentina)
资金
- Universidad Nacional del Litoral (CAI + D)
- Agencia Nacional de Promocion Cientifica y Tecnica (PICT) of Argentina [1855]
- Comision de Financiamiento de Actividades Academicas (Direccion de Investigacion e Innovacion) of the Universidad Catolica de la Santisima Concepcion (UCSC, Chile)
We analysed the effects of decadal and annual hydrologic fluctuations on freshwater fisheries catches in the Middle Parana River for a period of six decades from the 1930s to the 1980s. The climatic fluctuations in this period strongly affected the hydrology of the Middle Parana River and the characteristics of its flow regime. The magnitude of floods as well as maximum, minimum and mean water levels increased progressively from 1930s until the 1980s concomitantly with increasing frequency and intensity of El Nio Southern Oscillation events that resulted in differentiation of distinct hydrological periods. The flood pulses were significantly more frequent and of greater magnitudes during the 1970s and 1980s. These large floods resulted in increased commercial fish catches in the 1980s, possibly because of enhanced recruitment. Specifically, large floods increased the commercial fish catches 2 years later. This effect was stronger for species that use floodplain habitats as areas of reproduction and larval nurseries, such as Prochilodus lineatus. We conclude that the natural flow regime of the Parana River and perhaps other large subtropical rivers must be preserved in order to sustain their productive fisheries. Copyright (C) 2016 John Wiley & Sons, Ltd.
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