Abstract

3,4 Abstract: Protozoa are important members of ecosystems, but protozoa that inhabit caves are poorly known worldwide. In this work, we present data on the record and distribution of thirteen protozoa species in four underground biotopes (water, soil, bat guano, and moss), at Cueva de Los Riscos. The samples were taken in six different months over more than a year. Protozoa species were ciliates (eight species), flagellates (three species), amoeboid (one species), and heliozoan (one species). Five of these species are reported for the first time inside cave systems anywhere, and an additional three species are new records for Mexican caves. Colpoda was the ciliate genera found in all cave zones sampled, and it inhabited the four biotopes together with Vorticella. The biotopes with the highest specific richness were the moss, sampled near the main cave entrance, and the temporary or permanent water bodies, with ten species each. The greatest number of species was observed in April 2006 (dry season). With the exception of water, all biotopes are studied for the first time.

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