Bark pH and susceptibility to toxic air pollutants as independent causes of changes in epiphytic lichen composition in space and time

By C. M. V. Herk. The Lichenologist, 2001

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Long-Term Monitoring in the Netherlands Suggests that Lichens Respond to Global Warming (2002, methodology): “Data collected during lichen surveys in 1979 (van der Knaap 1980), 1984 (van der Knaap 1984; fieldwork partly carried out by A. Aptroot), 1989 (Aptroot 1990), 1995 (van Herk 1996) and 2001 (van Herk 2001b) were used, all based on monitoring sites with usually 10 trees of the same species.”
The distribution of epiphytic bryophyte and lichen species in relation to phorophyte characters in Latvian natural old-growth broad leaved forests (2008, background): “Tree bark pH is known to be associated with epiphytic cryptogam species richness (Weibull, 2001; van Herk, 2001; Mežaka & Znotiņa, 2006; Löbel et al., 2006).”
Detecting changes in epiphytic lichen communities at sites affected by atmospheric ammonia from agricultural sources (2006, background): “In the Netherlands an increase in pH due to NH3 is associated with an increase in nitrophytic communities of the Xanthorion (van Herk 1999, 2001).”