Resumo

LOPEZ-SANDOVAL, Óscar et al. Algal diversity from extreme environment: the geothermal spring Los Hervideros, Mexico. Rev. Mex. Biodiv. [online]. 2016, vol.87, n.1, pp.1-9. ISSN 2007-8706.  https://doi.org/10.1016/j.rmb.2016.01.004.

In this work we describe the algal diversity, which is in Los Hervideros geothermal spring, in Michoacán, Mexico, and its spatial distribution related with the thermal gradient. This spring forms a part of Los Azufres system, which is affected by volcanic activity from the Transversal Neovolcanic Belt. The species identification was morphological and physical and chemical parameters were measured as temperature, specific conductivity and pH. The temperature recorded was between 22.2 to 85.2 °C. The specific conductivity is as high as 3,400 to 4,430 μS cm-1, while the pH is 7.5 to 8.0. The growth were dominated by the next Cyanophyceae species: Arthrospira sp., Synechococcus sp. and Synechocystis sp. in temperatures from 22 to 76 °C, respectively. As far as the Bacillariophyceae, we registered: Achnanthidium exiguum, Halamphora veneta, Anomoeoneis costata, Diploneis elliptica and Pinnularia viridis in temperatures from 22 to 55 °C. We also registered one Chlorophyceae species, Oedogonium sp. (30 to 35 °C). This spring is characterized by the presence of great changes of temperate in a few centimeters, which is reflected in a heterogeneous distribution of the algal species.

Palavras-chave : Bacillariophyceae; Chlorophyceae; Cyanophyceae; Gradient; Temperature; Tolerance; Hydrothermal.

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