Resumo

MORALES, Eduardo A.; RIVERA, Sinziana F.; AYALA, Rosemary  e  ACOSTA, Francisca. On the occurrence of  Cyclotella meduanae Germain (Bacillariophyta) in Alalay Pond, a saline and eutrophic water body (Cochabamba, Bolivia). RevActaNova. [online]. 2013, vol.6, n.1-2, pp.82-93. ISSN 1683-0789.

The occurrence in year 2005 of the centric diatom Cyclotella meduanae Germain in Alalay Pond, a saline, highly eutrophic ecosystem in the city of Cochabamba, Bolivia is reported. The naturally small sizes attained by the cells of this taxon do not allow their reliable identification at magnifications given by the light microscope. Therefore, the use of scanning electron microscopy (SEM) is required to observe the diagnostic features that separate C. meduanae from morphologically similar taxa: the relatively flat central area lacking strutted processes, the undulated valve face perimeter, presence of strutted processes with three satellite pores and presence of non-alveolate striae. Previous South American records of the taxon are discussed, as is its ecology in the context of available literature.

Palavras-chave : Alalay Pond; Bacillariophyta; Bolivia; centric diatom; distribution; South America; taxonomy.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )