Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 142, Issue -, Pages 151-159Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2019.05.011
Keywords
Bioreceptivity index (BI); Conservation; Lichen removal procedure; Non-destructive techniques; Colour measurements; Chlorophyll fluorescence
Funding
- Spanish government (AEI/FEDER,UE) [CGL2011-22789, CGL2016-79778-R]
- Xunta de Galicia [ED431C 2018/32]
- MICINN-FPI [BES-2017-079927]
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Schist weathering induced by the presence of lichen is one of the main concerns in the Goa Valley (northeast Portugal) and Siega Verde (northwest Spain) Archaeological Parks. In this study, different types of lichens, including mainly crustose forms (Caloplaca pellodella, Candelariella vitellina, Circinaria hoffmanniana, Diploschistes actinostomus and Lecidea fuscoatra) as well as some foliose forms (Parmelina tiliacea and Xanthoparmelia conspersa), were removed from schistose samples of both lithotypes in different locations. The lichens were removed by treatment with Biotin T-center dot biocide or by laser treatment with the first (1064 nm, IR) and fourth (266 nm, UV) harmonics of a Nd:YAG laser. To assess the effects of the treatments, a recolonization experiment was carried out with biofilm-forming phototrophic microorganisms, and a bioreceptivity index (BI) was calculated for each lithotype and treatment. A water-based treatment (the removal method currently used in both parks) was used as a control cleaning treatment in the bioreceptivity experiment. The study findings show the importance of bioreceptivity studies for evaluating the effectiveness of cleaning treatments. Treatment of the schist samples with the chemical biocide significantly decreased the bioreceptivity (complete inhibition of biofilm formation), whereas laser treatments (especially IR laser) significantly increased the tertiary bioreceptivity. Moreover, the tertiary bioreceptivity of the schists depended on both the treatment applied and the nature of the substrate.
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