The “entrance” zone is climatically variable and is affected by the environmental conditions prevailing in the immediate external environment of the cave while the “low light” zone (part more interior of the cave) is characterized by weak or non-existent light; Additionally, the temperature is relatively stable throughout the year and relative humidity levels reach the maximum values ​​recorded in the cave. Another area between the entrance and the low-light zone (i.e. the “transition” zone) has characteristics of either the entrance or the low-light zone (Christodoulou et al. 2015). Photosynthetic microorganisms are capable of using light at different wavelengths between 400 and 700 nm for primary production; we can thus conclude that the progressive reduction of natural light controls the growth of photosynthetic microflora (Pantazidou 1996, Ascencio and Aboal 2000, Beltran and Ascencio 2009, Lamprinou et al. 2009, Roldan and Hernandez-Marine 2009, Christodoulou et al. 2011, Alberta