Lucinda, I; Matsumura-Tundisi, T; Melao, MGG; Moreno, IH
The composition of the Rotifera was investigated, in 19 water bodies in the Upper Tiete system (SP, Brazil), as an integral part of a survey of zooplankton across the State of Sao Paulo, planned to include the 22 Water Resource Management Units of the State, which forms part of the BIOTA program, the exhaustive survey of Sao Paulo flora and fauna organised by the state research funding agency, FAPESP. The rotifer samples were caught in a plankton net of mesh 35 mu m, swept horizontally and vertically in the littoral and limnetic zones of freshwater bodies, and then fixed in 4% formaldehyde. Netted material was sorted under a stereo-microscope and the rotifers identified by optical microscopy. One hundred nine taxa belonging to 20 families in subclass Monogononta were catalogued. The families that predominated were Lecanidae, Brachionidae, Trichocercidae, Notommatidae and Lepadellidae, all of which are common in the tropics. Conochilus unicornis, Keratella cochlearis, Lecane bulla, Polyarthra aff. vulgaris and Trichocerca similis, as well as the bdelloid rotifers, were found at almost all the collection sites. The presence of certain species seemed to correlate with a higher trophic level in the water, these being: Brachionus angularis, B. calyciflorus, B. havanaensis havanaensis, Filinia opoliensis, Kellicottia bostoniensis, Keratella cochlearis var. tecta and Trichocerca capucina multicrinis. Eight novel occurrences in Sao Paulo State were recorded, one being novel in South America, and diagnoses and plates are provided for some of these species.Original Abstract: A composicao da fauna de Rotifera em 19 corpos de agua do alto Tiete (Sao Paulo, Brasil) foi estudada como parte integrante de um levantamento zooplanctonico proposto para as 22 Unidades de Gerenciamento de Recursos Hidricos do Estado de Sao Paulo (UGRHIs), dentro do Programa BIOTA/FAPESP. As amostras para analise da fauna de rotiferos foram obtidas utilizando-se rede de plancton de abertura de malha de 35 mu m, envolvendo arrastos horizontais e verticals na area limnetica e litoranea e, posteriormente, fixadas em formol 4%. O material obtido foi triado em microscopio estereoscopio e os rotiferos identificados em microscopic optico. Foram catalogados 109 taxons pertencentes a 20 familias da subclasse Monogononta. A composicao da fauna de rotiferos foi predominantemente constituida por taxons das familias Lecanidae, Brachionidae, Trichocercidae, Notommatidae e Lepadellidae, comuns em ambientes tropicais. Conochilus unicornis, Keratella cochlearis, Lecane bulla, Polyarthra aff. vulgaris e Trichocerca similis, alem dos bdeloideos, estiveram presentes na quase totalidade das localidades amostradas. A ocorrencia de algumas especies parece estar relacionada ao maior grau de trofia das aguas, sendo elas: Brachionus angularis, B. calyciflorus, B. havanaensis havanaensis, Filinia opoliensis, Kellicottia bostoniensis, Keratella cochlearis var. tecta e Trichocerca capucina multicrinis. Foram registradas oito novas ocorrencias para o Estado de Sao Paulo, sendo uma nova ocorrencia para a America do Sul. Sao apresentadas pranchas e diagnoses para algumas especies.
Rotifers; Water Resources Abstracts; ASFA 1: Biological Sciences & Living Resources; Water management; Kellicottia bostoniensis; Brachionus angularis; Filinia opoliensis; Aquatic Habitats; Lepadellidae; Keratella cochlearis; Trichocerca similis; Brazil, Sao Paulo, Tiete R. basin; Freshwater; Notommatidae; Plankton; Trichocercidae; Habitat; Rotifera; Plankton surveys; Community composition; Littoral zone; Lecanidae; Lecane bulla; River Basins; Trophic Level; Freshwater crustaceans; Surveys; Brachionidae; Polyarthra; Microscopy; Trichocerca capucina; Conochilus unicornis; Water Resources Management; Zooplankton