We use data on the elevation of sampling sites where supplied
(in northwestern Thailand this is available for 70% of records)
to investigate altitudinal stratification. We categorized records
as ‘lowland’ (≤600 m), ‘intermediate’ (601–1699 m) or
‘montane’ (≥1700 m), and classified species as elevationspecific
if they were only recorded in one of these zones (the
number of records per elevation-specific species varied
between one and 158, median = 8).