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2011). Under such conditions the oligotrophic nature of cave environments is expected to change through organic inputs that alter both the food web, and the abundance and distribution of cave organisms (Hoyos et al., 1998; Fernández-Cortés et al., 2006; Saiz-Jimenez et al., 2011; Saiz-Jimenez, 2012). Additionally, the artificial lighting system in the show caves affects the photosynthetic microflora in areas around the installed illumination equipment. The photosynthetic community thriving in proximity to artificial lighting is known as ‘Lampenflora’ – a term introduced by Dobàt (1963) – and it was first studied in Austrian caves (Kyrle, 1923; Morton and Gams, 1925). Further research has shown that the growth and distribution of these floristic aggregations depend on abiotic factors such as light quality and intensity, temperature, relative humidity, as well as type and coherence of the underlying substratum (Roldán e