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Brazilian Journal of Biology

versão impressa ISSN 1519-6984versão On-line ISSN 1678-4375

Braz. J. Biol. v.63 n.2 São Carlos maio 2003

http://dx.doi.org/10.1590/S1519-69842003000200005 

Rotifers of the upper Paraná River floodplain: additions to the checklist

 

Rotíferos da planície de inundação do alto rio Paraná: novas ocorrências

 

 

Serafim, M. Jr.I; Bonecker, C. C.II; Rossa, D. C.I; Lansac-Tôha, F. A.II; Costa, C. L.III

IUniversidade Estadual de Maringá, Curso de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais
IINupélia, Curso de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá, Av. Colombo, 5790, CEP 87020-900, Maringá, PR, Brazil
IIINupélia, Departamento de Biologia da Universidade Estadual de Maringá

Correspondence

 

 


ABSTRACT

Rotifers present a high diversity in freshwater ecosystems. This study registered 11 genera and 42 species, new records for the Upper Paraná River floodplain. These results showed an increase in rotifer diversity in this ecosystem from 184 to 230 species. Among them some were registered only in the rivers and others in the lagoons. Thirty-seven species occurred in the littoral zone and 34 species in the pelagic; 3 species were registered only in the former zone and 2 species only in the latter. The lagoons presented the greatest richness, probably because of the greater stability, low current velocity, and the extensive aquatic macrophyte banks in the littoral zone of these environments as compared to those of the rivers. The highest number of species in the littoral habitats occurred due to the greater influence of shoreline vegetation, which allows greater habitat diversification. This fact contributed to the occurrence of non-planktonic species in the zooplankton samples.

Key words: rotifers, floodplain, richness, new records, Paraná river.


RESUMO

Os rotíferos apresentam elevada diversidade em ambientes aquáticos continentais. Este estudo mostra novas ocorrências de 12 gêneros e 42 espécies desse grupo na planície de inundação do alto rio Paraná, o que incrementa o registro de 184 espécies para 230 espécies nesse ecossistema. Entre esses novos registros, algumas espécies ocorreram somente em lagoas e outras, apenas em rios. Foram encontradas 37 espécies na região litorânea e 34 na região pelágica dos ambientes estudados, dentre estas 3 espécies foram registradas apenas na primeira região e somente 2 na segunda região. As lagoas apresentaram os maiores valores de riqueza, provavelmente em razão da grande estabilidade, menor velocidade de corrente e presença de extensos bancos de macrófitas aquáticas. A presença de vegetação marginal permite grande diversificação de habitats, contribuindo para a ocorrência de um número expressivo de espécies na região litorânea. Esse fato contribuiu para a ocorrência de espécies não planctônicas no zooplâncton.

Palavras-chave: rotífero, planície de inundação, riqueza, novas ocorrências, rio Paraná.


 

 

INTRODUCTION

Biodiversity is the variety of organisms considered at all levels and includes genetic and ecosystem variants, which comprise arrays of species, genera, and families, as well as communities of organisms within particular habitats and the physical conditions under which they live (Wilson, 1992).

Rotifers present a high diversity in freshwater ecosystems. According to Nogrady (1993), early rotifer distribution studies show that all rotifers are cosmopolitan, but recent research considers that endemism is significant in several genera, e.g., Notholca, and describes latitudinal zonation in certain planktonic rotifers and restricted distribution for some species (Green, 1972; Pjeler, 1977; Dumont, 1983).

The Paraná River segment discussed in this paper presents a wide braided channel with a low gradient (0.09 m/km) and a wide floodplain in Mato Grosso do Sul State. This segment extends 480 km and may reach up to 20 km in width. It is the last non-dammed section of the Paraná River in Brazil (Agostinho et al., 1995).

New records from lagoons and rivers of the Upper Paraná River floodplain are included in this study following research developed by Bonecker et al. (1994, 1998a), and Lansac-Tôha et al. (1997).

 

MATERIAL AND METHODS

Rotifers were collected at different depths from the littoral (surface) and pelagic (surface, middle, and bottom) regions in nine lagoons (Guaraná, Aurélio, Fechada, Patos, Peroba, Cervo, Jacaré, Capivara, and Clara) and two rivers (Baía and Ivinheima) in the floodplain (Fig. 1). The samples were preserved immediately with buffered 4% formalin. Identification was based on Koste (1978), Koste & Robertson (1983), José de Paggi (1989), Nogrady (1993), and Segers (1995).

 

 

RESULTS

A total of 11 genera (Kellicotia, Aspelta, Paradicranophorus, Encentrum, Lancinularia, Limnias, Sinantherina, Octotrocha, Lindia, Itura, and Tetrasyphons) and 42 species are new records for the Upper Paraná River floodplain (Table 1).

 

 

According to families, the greatest species richness increase was observed for Lecanidae (8 species), Brachionidae (6 species), and Notommatidae (6 species) (Table 1).

Most species, such as Brachionus caudatus austrogenitus, Brachionus caudatus insuetus, Brachionus quadridentatus melheni, Trichocerca longiseta, Lecane bulla goniata, Lecane cornuta rotunda, Lepadella acuminata, Aspelta cf. angusta, Sinantherina spinosa, Sinantherina procera, Gastropus hyptopus, Mytilinia ventralis macracantha, Mytilinia ventralis brevispinus, Cephalodella forficula, Cephalodella gibba, Cephalodella stenroosi, Cephalodella tenuiseta, Monommata cf. longiseta, Lindia sp., Itura sp.,and Tetrasyphons hydrocora occurred in the Patos Lagoon and Ivinheima River. Brachionus mirus reductus occurred in Guaraná and Patos lagoons and the Ivinheima River. Euchlanis lyra was registered in Guaraná Lagoon and Baía River.

Others species occurred only in the lagoons: Brachionus forficula forficula (Jacaré, Capivara, and Fechada), Kellicotia bostoniensis (Aurélio and Jacaré), Trichocerca macera (Cervo and Peroba), Trichocerca dixon nutalli (Clara),and Trichocerca cf. tigris, Lecane unguitata, Lepadella quinquecostata, Octotrocha sp., Dicranophorus cf. robustus, Scaridium longicaudium, and Epiphanes cf. macrourus (Patos).

Finally, some species were registered only in the Ivinheima River: Lecane elegans, Lecane ludiwigii ohiensis, Lecane hastata, Paradicranophorus wockei, and Mytilinia cf. unguipes.

Based on the horizontal distribution in each environment, some differences were verified. Thirty-seven species occurred in the littoral zone and 34 species in the pelagic. Among these, 3 (Trichocerca cf. tigris, Lecane unguitata, Mytilinia cf. unguipes) species were registered only in the former zone and 2 (Lecane elegans, Paradicranophorus cf. wockei) only in the latter (Table 1).

Comparing the environments, the lagoons presented the greatest richness, is probably owing to the greater stability and low current velocity of these environments compared to that of the rivers.

 

DISCUSSION

The richness results increased rotifer diversity in the Upper Paraná floodplain from 184 species (Bonecker et al., 1994; Lansac-Tôha et al., 1997; Bonecker et al., 1998a) to 230 species.

The higher diversity observed for the Lecanidae and Brachionidae families was also true for these families in the Pantanal Matogrossense (States of Mato Grosso do Sul and Mato Grosso) (Turner & da Silva, 1992; Bonecker et al., 1998b; Martínez et al., 2000), the floodplains of the Middle Paraná River (Argentine stretch) (José de Paggi, 1996), the Upper Paraná River (Brazilian stretch) (Sendacz, 1993), and the rivers Amazon (Robertson & Hardy, 1984; Bozelli, 1992), Orinoco (Twombly & Lewis Jr., 1987; Vásquez & Rey, 1989), Upper Orthon (Bolívia, Barbosa et al., 1999), and the Niger (Nigeria, Segers et al., 1993). The greatest occurrence of species of the genus Lecane in tropical regions was also mentioned by Koste & Shiel (1983), Bozelli (1992), Bonecker et al. (1994), Dussart et al. (1984), Dabés (1995), Koste (1999), Sharma & Sharma (2001). This genus and Brachiouns were best represented in Southeast Asia (Segers, 2001).

As for some limnological characteristics of the environments in the various floodplain environments, the lagoons are shallow (1.5-5.0 m) and present lowest mean values for temperature, conductivity, and dissolved oxygen, and the highest mean chlorophyll-a concentrations (Thomaz et al., 1992). They also have extensive banks of aquatic macrophytes in the littoral region, principally Eichhornia azurea (Schwartz) Kunth. These lowland lagoons occupy depressions formed by active or inactive channels, and have constant or intermittent communication with the Paraná River or secondary channels (Souza Filho & Stevaux, 1997).

The rivers also present aquatic macrophytes in the littoral area, chiefly Eichhornia azurea (Schwartz) Kunth. The Baía River is characterized by low current velocity (0.11-0.50 m/s) and high concentration of dissolved humic substances. The Ivinheima River has neutral to alkaline pH, high conductivity, complete alkalinity, dissolved oxygen, and low chlorophyll-a concentrations (Thomaz et al., 1991; Bonecker & Lansac-Tôha, 1996).

Although there is no great difference in rotifer richness between the habitats of these environments, the highest number of species in the littoral habitats occurred due to the greater influence of shoreline vegetation, which allows greater habitat diversification (Green, 1972). This fact contributed to non-planktonic species occurrence in the zooplankton samples (Bonecker et al., 1998a). The important role of emergent and submerged aquatic macrophytes in the community composition of rotifers was also verified in small lagoons and temporary ponds in the Pantanal Matogrossense (Bonecker et al., 1998b), in an artificial lake (Martínez et al., 2000) in the State of Mato Grosso do Sul, and in a New Zealand lake (Duggan et al., 1998).

The higher diversity observed in the lagoons was related to some characteristics of these environments, e.g., low velocity of current. According to Ward (1994), the reproducing populations of planktonic organisms are restricted to the slow-flowing lower reaches of these environments.

Acknowledgments – We thank CNPq, CAPES, and Nupélia for financial and logistical support. Dr. John Jervis Stanley Junior revised the english text.

 

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Correspondence to
Claudia Costa Bonecker, Nupélia
Curso de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá
Av. Colombo, 5790, Maringá, PR
CEP 87020-900, Brazil
E-mail: bonecker@nupelia.uem.br

Received May 9, 2002 – Accepted July 11, 2002 – Distributed May 31, 2003

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