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• Rev. Bras. Zool. 15 (2) • 1998 • https://doi.org/10.1590/S0101-81751998000200006   copy

Species composition and abundance of rotifers in different environments of the floodplain of the upper Paraná river, Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The purpose of this study was to describe the composition and abundance of rotifers in different environments: one lotie (the Ivinheima River) and another lentic (the Patos Lake) located in the floodplain of the Upper Paraná River. The influence of limnological variables on the structure and dynamics of rotifers was also examined. Samples were taken monthly from March 1992 through February 1993, in the open water region of the lake and river and in the channel between them and, in the littoral region of the lake and river. Of the 96 species identified, the best represented families were: Brachionidae (20 species), Lecanidae (18 species), and Trichocercidae (15 species). 55 species were widely distributed, 13 were pantropical, 16 neotropical (8 endemic to South America). Trichocerca gracilis was a new record for this floodplain. Dipleuchlanis propatula propatula, Lecane curvicornis, L. leontina, L. bulla, Plationus patulus patulus, Platyias quadricornis quadricornis, Testudinella patina, and T. mucronata hauriensis were consistently present. More species were recorded during the high water period, probably because of the interconnection among the different environments of the floodplain that allows fauna exchange and an increase in available habitats. Rotifer densities were higher mainly in the lake, during the high water. Using principal components analysis, was identified four variables that influence the seasonal variation in the rotifer densities: water level, dissolved oxygen, chlorophyll-a concentration, and water temperature.

Rotifera; Paraná River; floodplain; neotropics

Species composition and abundance of rotifers in different environments of the floodplain of the upper Paraná river, Brazil

Aparecida Paula Perez Garcia; Fábio Amodêo Lansac-Tôha; Cláudia Costa Bonecker

Curso de Pós-graduação em Ambientes Aquáticos Continentais, Departamento de Biologia, Nupélia, Universidade Estadual de Maringá. Avenida Colombo 5790, 87020-900 Maringá, Paraná, Brasil.

ABSTRACT

The purpose of this study was to describe the composition and abundance of rotifers in different environments: one lotie (the Ivinheima River) and another lentic (the Patos Lake) located in the floodplain of the Upper Paraná River. The influence of limnological variables on the structure and dynamics of rotifers was also examined. Samples were taken monthly from March 1992 through February 1993, in the open water region of the lake and river and in the channel between them and, in the littoral region of the lake and river. Of the 96 species identified, the best represented families were: Brachionidae (20 species), Lecanidae (18 species), and Trichocercidae (15 species). 55 species were widely distributed, 13 were pantropical, 16 neotropical (8 endemic to South America). Trichocerca gracilis was a new record for this floodplain. Dipleuchlanis propatula propatula, Lecane curvicornis, L. leontina, L. bulla, Plationus patulus patulus, Platyias quadricornis quadricornis, Testudinella patina, and T. mucronata hauriensis were consistently present. More species were recorded during the high water period, probably because of the interconnection among the different environments of the floodplain that allows fauna exchange and an increase in available habitats. Rotifer densities were higher mainly in the lake, during the high water. Using principal components analysis, was identified four variables that influence the seasonal variation in the rotifer densities: water level, dissolved oxygen, chlorophyll-a concentration, and water temperature.

Key words: Rotifera, Paraná River, floodplain, neotropics

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ACKNOWLEDGEMENTS. We thank Dr. Janet W. Reid for assistence with the English text. Thanks are due to our colleagues Dr. Susana José de Paggi for the identification of some species; Dr. Sérgio Luiz Costa Bonecker, Dr. Sidinei Magela Thomaz, Luiz Felipe Machado Velho and Luis Maurício Bini for their suggestions and their help in data analysis; to the staff of the Center for Research in Limnology, Ichthyology and Aquaculture (Nupélia, Universidade Estadual de Maringá) for technical and scientific support; to PADCT/CIAMB for the necessary financial support, to CAPES for several scholarships grants.

Recebido em 27.III.1997; aceito em 14.V.1998.

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Publication Dates

  • Publication in this collection
    10 July 2009
  • Date of issue
    1998

History

  • Received
    27 Mar 1997
  • Accepted
    14 May 1998
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