## 3 Results and Discussion
### Microalgae Identification
\begin{table}
\begin{tabular}{c c c c} \hline \hline  & **Fountain** & \multicolumn{2}{c}{**Most Common Genera**} \\ \hline  & & **Green Algae** & **Cyanobacteria** & **Diatoms** \\ \hline  & & & _Symplox_ (1-1), \\
6. & _Patio de la_ & & _Leptolyngbya_ (5-4), \\  & _Reja_ fountain & _Chlorosarcina_ (7-5) & _Chamanesibron_ (3-2), \\  & & & _Calothrix_ (2-1) \\ \hline  & _Patio de_ & _Chlorococcum_ (4-2), \\  & _Lindaraja_ fountain & _Chlorosarcinopsis_ (4-1), \\  & _Klebsormidium_ (5-2) & & _Chamanesibron_ (6-3), \\ \hline  & & _Phormidium_ (2-2) & \\
8. & Ladies Tower (_Torre_ & & _Pismola_ (3-2), \\  & _de las Damas_) & _Pleurastrum_ (2-2) & _Phormidium_ (3-2), \\  & & & _Leptolyngbyu_ (2-1) \\ \hline  & _Mirador del_ & & _Navicula_ (2-1) \\  & _Partal_ basin & _Bracteacoccus_ (4-4) & & _Navicula_ (2-1) \\ \hline  & & & \\
10. & Inner fountain of & & _Symplox_ (3-2), \\  & the court & & _Phormidium_ (3-2), \\  & with oranges & & _Leptolyngbyu_ (2-1) \\ \hline  & & & \\
11. & _Jardin de los Adarves_ & _Bracteacoccus_ (3-2), \\  & east basin & _Chlorystis_ (1-1) & \\ \hline  & & & \\
12. & _Glorieta del_ & & _Chamanesibron_ (2-1), \\  & _Secano_ fountain & _Bracteacoccus_ (4-3) & _Cyanosarcina_ (1-1) \\ \hline  & & & \\
13. & _Jardines Bajos_ & & _Phormidium_ (2-2) \\  & South fountain & & _Phormidium_ (2-2) \\ \hline  & & & \\
14. & _Patio de la sultana_ & _Gongrosira_ (3-1), \\  & central fountain & _Bracteacoccus_ (3-3) & _Phormidium_ (3-1), \\  & & & _Lyngbyu_ (1-1) \\ \hline  & & & \\
15. & _Escalera del_ & _Pseudopleurococcus_ (1-1), \\  & _Agua_ handrail & _Leptolyng_ (2-1), \\  & _Chlorosarcina_ (2-2) & & _Chlorosarcina_ (1-1) \\ \hline  & & & \\
16. & _Fuente del tomato_ & _Bracteacoccus_ (2-1) & _Chlorosleva_ (1-1), \\  & & & _Phormidium_ (2-1) \\ \hline  & & & \\
17. & Angel Ganivet & & \\  & pool fountain & _Bracteacoccus_ (2-2) & _Leptolyngbyu_ (1-1) \\ \hline  & & & \\
18. & Carlos V basin & _Bracteacoccus_ (3-1) & _Chamanesibron_ (2-1) \\ \hline  & & & \\
19. & Washington & & \\  & Irving basin & _Bracteacoccus_ (2-1) & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: _Cont._In general, diatoms are the least common type of microalgae of the three groups studied. The most common genera are _Navicula_, _Nitzschia_, _Cymbella_ and _Achnanthes_, all of which are unicellular; in other words, the cells appear individually and do not form aggregates adhering strongly to surfaces. Of these four genera, _Navicula_, _Nitzschia_ and _Cymbella_ were the ones that generally appeared most often. All of these diatoms appear to a greater or lesser extent as part of more complex communities of cyanobacteria or green algae, except one specific case in which a monospecific community of _Achnanthes_ sp. was found on the surface of the basin at the Fountain of the Lions in a submerged environment. Among the green algae, the unicellular coccoid algae were very widespread in many fountains. The most common genera were _Chlorococcus_, _Bracteacoccus_, _Chlorosarcina_ and _Chlorosarcinopsis_ (Figure 6a). The latter two are able to form generally compact cellular aggregates; less frequent (but still common) were the _Chlorella_ and _Choricytis_ genera. In addition to the coccoid algae, we also found pseudoparenchymatic green algae--_Pleurastrum_ sp. appears on the \"guuitar\" of the Ladies Tower and _Gongrosira_ sp. appears in the pool of the central fountain of the Court of the Sultana, both in submerged zones; while _Leptosira_ sp. and _Pseudopleurococcus_ sp. grow in the Water Stairway's handrail in amphibious and submerged zones. As for filamentous algae, the _Klebsornidium_ genus is common, which is also capable of growing in aerial zones. The filamentous alga _Cladophora_ sp. has also been found sporadically (in the Lindaraja fountain and the _mirador del Partal_ basin), as has _Stigeeconium_ sp. (_Ratio de los Arrayanes_ southern \"guitar\" fountain). _Stichococcus_ sp. appears in amphibious and aerial zones of the Fountain of the Lions and in the handrail of the _Escalera del Agua_, although not abundantly.