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7 International Journal of Ecohydrology and Hydrobiology

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Threats for biodiversity in the floodplain of the Upper Parana River: effects of hydrological regulation by dams

100%

Agostinho A. A. , Thomaz S. M. , Gomes L. C.

International Journal of Ecohydrology and Hydrobiology

2004

tom 04

nr 3

267-280

Factory affecting fish diversity and abundance in drying ponds and lagoons in the upper Parana River basin, Brazil

100%

Okada E. K. , Agostinho A. A. , Petrere M.,Jr. , Penczak T.

International Journal of Ecohydrology and Hydrobiology

2003

tom 03

nr 1

97-110

Effects of water quantity on connectivity: the case of the upper Parana River floodplain

100%

Agostinho A. A. , Bonecker C. C. , Gomes L. C.

International Journal of Ecohydrology and Hydrobiology

2009

tom 09

nr 1

The hydrological regime is the main force driving processes in river-floodplain systems. The flood pulse concept serves as a base from which to study the processes acting in such a system. However, when the flood pulse is regulated and there is a need to re-establish the hydrography at close to natural conditions, the best way to achieve this is via ecohydrology, a newly emerging paradigm. In this paper, we use principles of ecohydrology to evaluate the effect of water quantity on the limnology, biota and fishery of the upper Paraná River systems, where a UNESCO demonstration site on ecohydrology is located. In addition, we argue that dam operation can be crucial for restoring the hydrography of the Paraná River to near natural conditions. The data used were collected between 1986 and 2006 in several habitats of the floodplain. The limnology, biota (periphyton, phytoplankton, zooplankton, benthic invertebrates, fish, macrophytes and riparian vegetation) and fishery (ecosystems services) were all influenced by the alteration in the hydrography prompted by the functioning of the dams located upstream from the demonstration site area. Moreover, the observed deterioration of the water quality due to the presence of toxic cyanobacteria is another strong argument for adjusting the dam’s operation to reestablish the timing of the floods to match critical periods of the biota in order to restore ecosystem biodiversity and services.

Patterns of fish assemblages in tropical streamlets using SOM algorithm and conventional statistical methods

100%

Penczak T. , Lek S. , Godinho F. , Agostinho A. A.

International Journal of Ecohydrology and Hydrobiology

2004

tom 04

nr 1

139-146

The importance of floodplains for the dynamics of fish communities of the upper river Parana

100%

Agostinho A. A. , Gomes L. C. , Zalewski M.

International Journal of Ecohydrology and Hydrobiology

2001

tom 01

nr 1-2

The last free stretch of the River Paraná inside of Brazilian territory, about 230 km of the former 810 km, runs in a wide floodplain, which flood regime is controlled in part by upstream dams. Aim to evaluate the impacts of different levels of hydrological control on the regional fish diversity, nutritional condition, trophic categories proportion, reproduction and young abundance monthly sampling were carried, between 1986 and 1993, during three annual periods with different flood duration and intensity. Lagoons, secondary channels and river channel was sampled with gillnet of different mesh size and standardized effort. Diversity, evenness indexes and number of species increased with the occurrence of floods. The trophic category proportions varied among the periods considered, with a decrease in piscivores participation and an increase of iliophages, herbivores and insectivores (terrestrial) participation in big flood years. The tendencies for piscivores guild were not uniform to every pecies. The variations on the nutritional condition reveal that the absence of flooding has a negative effect on greater migratory species and positive on sedentary ones. The young abundance shows, however, that fail in the flooding has a strong negative impact on de recruitment of all the reproductive strategies. It’s stressed the operational procedures in the upstream dams and the maintenance of the floodplain integrity is essential to preserve the regional biodiversity, fisheries and particularly the greater migratory fishes population.

Application of the ecohydrological concept for sustainable development of tropical floodplains: the case of the upper Parana River basin

88%

Agostinho A. A. , Gomes L. C. , Pelicice F. M. , Souza-Filho E. E. , Tomanik E. A.

International Journal of Ecohydrology and Hydrobiology

2008

tom 08

nr 2-4

205-223

Ecohydrology towards the sustainable development: An approach based on South American case studies

88%

Souza C. F. , Tassi R. , da Motta Marques D. , Collischonn W. , Agostinho A. A.

International Journal of Ecohydrology and Hydrobiology

2008

tom 08

nr 2-4

225-235