Relación entre la abundancia y estructura de la comunidad de peces y el régimen hidrológico, en lagunas de la alta cuenca del río Salado

Rosso, J.J. (2008) Relación entre la abundancia y estructura de la comunidad de peces y el régimen hidrológico, en lagunas de la alta cuenca del río Salado. PhD Thesis, Universidad de Buenos Aires. Facultad de Agronomía., 115pp.

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Abstract

This thesis explored the relationship between hydrological variability and associated changes in fish communities in the upper Salado river lakes (Pampa plain, Argentina). The sampling design included five sites along the river connected lakes being explored for fish, hydrological and environmental data during different hydrological conditions. The temporal dynamic of main environmental characteristics of these lakes show that hydrology largely regulates some of the most important factors influencing fish ecology. Changes in fish communities associated with this hydrological and environmental dynamic allow to speculate a first approach towards the functioning of the system as a whole. Following oscillation between droughts and floods, study lakes have shown significant changes on abundance of major fish species, as well as on their recruitment success, which finally leaded to marked changes in fish community structure. Interestingly, trophic structure of communities did not change as much. iOdontesthes bonariensis/i was more abundant during droughts and in saltier sites but also displayed an improvement in recruitment success during these harsh abiotic conditions. Conversely, the abundance of iParapimelodus valenciennis, Cyphocharax voga/i and iCyprinus carpio/i as well as its recruitment success, were largely favoured by lower water residence times and total salinity. This dichotomy is mainly based on different life history strategies of these species against flor and environmental variability and it support the existence of different functional groups among the fish species of upper Salado river lakes. iOligosarcus jenynsii/i did not showed as evident functional response. In conclusion, hydrological and environmental variability can be considered as one of the main factors regulating the functioning and structure of fish communities in these very shallow lowland river lakes of the Pampa plain. Following these results some implications for an eventual regulation of the river regime are discussed.

Item Type: Thesis
Title: Relación entre la abundancia y estructura de la comunidad de peces y el régimen hidrológico, en lagunas de la alta cuenca del río Salado
Personal Creator/Author:
CreatorsEmail
Rosso, J.J.plurosso@yahoo.com.ar
Number of Pages: 115
Date: 2008
Department: Escuela para graduados Alberto Soriano.
Institution: Universidad de Buenos Aires. Facultad de Agronomía.
Issuing Agency: Universidad de Buenos Aires. Facultad de Agronomía.
Uncontrolled Keywords: Odontesthes bonariensis, Parapimelodus valenciennis, Cyphocharax voga, Cyprinus carpio, Oligosarcus jenynsii, freshwater fish, abundance, population structure, Recruitment, Environmental factors, hydrology, Inland lagoons, peces de agua dulce, abundancia, estructura poblacional, factores ambientales, hidrología, Argentina, Buenos Aires, Río Salado
Subjects: Biology
Limnology
Item ID: 3560
Depositing User: Librarian Gabriela Silvoni
Date Deposited: 19 Jun 2010 07:12
Last Modified: 29 Sep 2011 17:12
URI: http://aquaticcommons.org/id/eprint/3560

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