caa a22 4500 475746163 CHVBK 20180406123514.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1007/s002849910015 doi (NATIONALLICENCE)springer-10.1007/s002849910015 Phototrophic Biofilms on Ancient Mayan Buildings in Yucatan, Mexico [Elektronische Daten] [Otto Ortega-Morales, Jean Guezennec, Guillermo Hernández-Duque, Christine C. Gaylarde, Peter M. Gaylarde] Abstract.: Buildings at the important archaeological sites of Uxmal and Kabah, Mexico, are being degraded by microbial biofilms. Phospholipid fatty acid (PLFA) and chlorophyll a analyses indicated that phototrophs were the major epilithic microorganisms and were more prevalent on interior walls than exterior walls. Culture and microscopical techniques showed that Xenococcus formed the major biomass on interior surfaces, but the stone-degrading genera Gloeocapsa and Synechocystis were also present in high numbers. Relatively few filamentous algae and cyanobacteria were detected. The fatty acid analysis also showed that complex biofilms colonize these buildings. Circular depressions observed by scanning electron microscopy (SEM) on stone and stucco surfaces beneath the biofilm corresponded in shape and size to coccoid cyanobacteria. SEM images also demonstrated the presence of calcareous deposits on some coccoid cells in the biofilm. Phototrophic biofilms may contribute to biodegradation by (1) providing nutrients that support growth of acid-producing fungi and bacteria and (2) active "boring” behavior, the solubilized calcium being reprecipitated as calcium carbonate. Springer-Verlag New York Inc., 2000 Ortega-Morales Otto Laboratoire de Biochimie des Molécules Marines, DRV/VP/BMM, IFREMER, B.P. 70, 29280, Plouzané, France, FR aut Guezennec Jean Laboratoire de Biochimie des Molécules Marines, DRV/VP/BMM, IFREMER, B.P. 70, 29280, Plouzané, France, FR aut Hernández-Duque Guillermo Facultad de Ingeniería, Universidad del Mayab, Car. Mérida-Progreso km.15.5, Cordemex 97310, Mérida, Yucatán, Mexico, MX aut Gaylarde Christine C. MIRCEN, Dept. Soils, UFRGS, Cx.P. 776, Porto Alegre, RS, 90001-970, Brazil, BR aut Gaylarde Peter M. MIRCEN, Dept. Soils, UFRGS, Cx.P. 776, Porto Alegre, RS, 90001-970, Brazil, BR aut https://doi.org/10.1007/s002849910015 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s002849910015 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ortega-Morales Otto Laboratoire de Biochimie des Molécules Marines, DRV/VP/BMM, IFREMER, B.P. 70, 29280, Plouzané, France, FR aut NATIONALLICENCE 700 1- Guezennec Jean Laboratoire de Biochimie des Molécules Marines, DRV/VP/BMM, IFREMER, B.P. 70, 29280, Plouzané, France, FR aut NATIONALLICENCE 700 1- Hernández-Duque Guillermo Facultad de Ingeniería, Universidad del Mayab, Car. Mérida-Progreso km.15.5, Cordemex 97310, Mérida, Yucatán, Mexico, MX aut NATIONALLICENCE 700 1- Gaylarde Christine C. MIRCEN, Dept. Soils, UFRGS, Cx.P. 776, Porto Alegre, RS, 90001-970, Brazil, BR aut NATIONALLICENCE 700 1- Gaylarde Peter M. MIRCEN, Dept. Soils, UFRGS, Cx.P. 776, Porto Alegre, RS, 90001-970, Brazil, BR aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer