Protozooplankton and its relationship with environmental conditions in 13 water bodies of the Mogi-Guaçu basin - SP, Brazil

Biota Neotropica

Inessa Lacativa Bagatini¹  Ana Lúcia Gerardi Spínola¹  Bianca De Miranda Peres¹  Adrislaine Da Silva Mansano¹  Mafalda Alexandra Antunes Rodrigues¹  Marco Antônio Portugal Luttembarck Batalha¹  José Valdecir De Lucca¹  Mirna Januária Leal Godinho¹  Takako Matsumura Tundisi¹  Mirna Helena Regali Seleghim¹ 

关键词: ciliates;    amoebae;    plankton;    environmental variables;    freshwater;    ciliados;    amebas;    plâncton;    variáveis ambientais;    água doce;   

DOI  :  10.1590/S1676-06032013000400016

来源: SciELO

【 摘 要 】

Protozooplankton is an important component of the aquatic microbial food webs and its composition, density, and distribution reflect the chemical, physical, and biological aspects of the environment. Considering the scarce literature on freshwater protozoans in Brazil and on protozoan ecology in subtropical environments, we listed the ciliates and amoebae taxa found in 13 water bodies in São Paulo State and analyzed their abundance in relation to the environmental variables. We collected two samples in each environment, fixed immediately with mercuric chloride and stained with bromophenol blue. After microscopical analysis, 74 protozoan genera were identified and the Ciliophora were dominant in the majority of the environments. The Stichotrichia, represented mostly by the genus Halteria, occurred in all environments, and was the dominant subclass in five of them. The canonic correspondence analysis of the most frequent genera and the environmental variables showed that nitrite and nitrate were the variables that better explained the distribution of Limnostrombidium, Urotricha, and Vorticella. The densities of the genera Halteria, Coleps, and of the species Cinetochilum margaritaceum were positively affected by increasing concentrations of dissolved oxygen, particulate phosphate, conductivity, and temperature. C. margaritaceum were also negatively affected by increasing concentrations of nitrite and nitrate. Considering that we made only one sampling in each environment, the richness was high compared to the mean diversity of lakes in the São Paulo State. The Diogo Lake, located in an ecological reserve, was the richest one, confirming the need of more research on the biodiversity of more preserved environments.

【 授权许可】

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