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Artículo

Effects of decadal changes in the hydrological regime of the middle reach of the Paraná River (Argentina) on fish densities

Espínola, Luis AlbertoIcon ; Amsler, Mario LuisIcon ; Paira, Aldo RaulIcon ; Drago, Edmundo Carlos E.Icon ; Blettler, Martin Cesar MariaIcon ; Agostinho, Angelo A.
Fecha de publicación: 07/2014
Editorial: Springer
Revista: Environmental Biology of Fishes
ISSN: 0378-1909
e-ISSN: 1573-5133
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Oceanografía, Hidrología, Recursos Hídricos; Bioquímica y Biología Molecular

Resumen

Changes in fish densities recorded over 14 years (1996-2009) were studied for effects of long-term variation of the hydrologic regime. We collected field data with an echo sounder in scour holes of minor channels draining an area of floodplain in the middle reach of the Paraná River. Fish densities in 2000-2009 were significantly lower than in the previous decade. The decrease was associated with a marked reduction of water levels, flood magnitudes and connectivity of channels with the nearby floodplain lakes. This distortion of the flood pulse likely had an effect on the life history strategies of the fishes. The effects of damming in the upstream basin and other man-made perturbations are minor in the middle reach. However, the decadal alterations of regime are intimately linked to climate fluctuations in the Paraná River basin during the past century. Tendencies of observed fish densities are similar to results reported in literature on the influence on fishes for similar long-term alterations of the flood regime in river flood plain systems.
Palabras clave: Climate Fluctuations , Echo Sounding , Fish Density , Flood Pulse , Scour Holes
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/22762
DOI: http://dx.doi.org/10.1007/s10641-013-0177-8
URL: https://link.springer.com/article/10.1007%2Fs10641-013-0177-8
Colecciones
Articulos(INALI)
Articulos de INST.NAC.DE LIMNOLOGIA (I)
Citación
Espínola, Luis Alberto; Amsler, Mario Luis; Paira, Aldo Raul; Drago, Edmundo Carlos E.; Blettler, Martin Cesar Maria; et al.; Effects of decadal changes in the hydrological regime of the middle reach of the Paraná River (Argentina) on fish densities; Springer; Environmental Biology of Fishes; 97; 7; 7-2014; 757-771
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