Lichen Monitoring in The Netherlands

In the Netherlands the provincial authorities are in charge for this type of monitoring of lichen. I am responsible for the actual data collection and owner of the data. Eight provinces (out of twelve) are involved, I give the size of the datasets and the years of investigation:

• Friesland 18.268 records (1991, 1996, 2003)
• Drenthe 56.549 records (1991, 1998, 2004, 2010)
• Gelderland 31.264 records (1990, 1994, (1997), 2003)
• Groningen 4.908 records (1991, 1996)
• Overijssel 42.568 records (1989, 1994, 1999, 2005)
• Utrecht 64.870 records (1979, 1984, 1989, 1995, 2001)
• Zeeland 17.268 records (1997, 2000, 2003, 2006)
• Noord-Brabant 8.410 records (1993, (1997))

Data on lichen abundance are collected on an ordinal scale.