Search

While restrictions imposed by the COVID-19 pandemic have strongly limited and affected the work of scientists and communicators, the pandemic has also encouraged the development of new ways of networking and public engagement. People have had to resort to virtual events, with a subsequent proliferation of webinars, online meetings, and digital resources. In this situation we have had to find new ways of measuring the impact of these activities. Using the activities of the Italian Lichen Society (Società Lichenologica Italiana, SLI), Google Trends and colleagues’ contributions, we evaluated the performances and impacts of virtual tools on lichenological literacy. We compared the relative success of virtual and in-person events and the effort required; we evaluated followers’ appreciation of various categories of posts on SLI Facebook page; and designed a questionnaire to collate information on individual experiences of in-person and virtual events linked to lichens. As expected, online events generally required less effort to put together and deploy than in-person events and engaged more people, especially when recorded and made available online for a long time. Using online searches for the word “lichens” we found an association with national events, and there was a notable increase in membership of SLI over the last 10 years, demonstrating an increasing interest by people in lichens. Without excluding the positive effects of in-person experiences, we believe that online events offer a powerful tool to help increase interest in, and knowledge about lichens. This interest may help to mitigate the impact of anthropogenic activities on this sensitive component of the ecosystem and help human-lichen relationships. Supplementary Information The online version contains supplementary material available at 10.1007/s13199-021-00780-6.

This study was carried out to investigate changes in lichen photosynthetic pigments induced by different combinations of light irradiance and water availability during a Mediterranean summer. To this purpose, thalli of three epiphytic lichens with a markedly different ecology concerning photo-hygrophytism, namely Evernia prunastri (hygro-mesophytic), Flavoparmelia caperata (mesophytic) and Xanthoria parietina (xero-mesophytic), were transplanted for 30 days to N- and S-facing cardinal exposures in central Italy. To investigate the effect of thallus hydration, at each cardinal exposure 50% of thalli were hydrated daily with deionised water. The results showed that changes in the concentrations of photosynthetic pigments are species-specific and consist in a general depression of photosynthetic pigments only in the hygro-mesophytic species E. prunastri. The pattern of photosynthetic pigments was also investigated in spontaneous samples along contrasting aspects. In this case, X. parietina from S-facing slopes, adapted to direct solar influx, showed higher pigment content than N-facing thalli; F. caperata and E. prunastri avoid direct extreme solar radiation and assimilation pigments were influenced more by the shadowing of tree canopies than by the cardinal exposure. The influence of drought on lichen photosynthetic pigments in the Mediterranean area is discussed.

In the present study we report some preliminary results concerning the evaluation of antiproliferative activity on murine myeloma cells (P3X63-Ag8.653) of crude extracts of two common lichen species, Evernia prunastri and Xanthoria parietina.