Table 2. Types of vegetation transitions (1958-2002) grouped into presence of cork oak (Quercus suber L.) persistence or absence of cork oak persistence (Fo: forest; Sa: savanna; Sr: shrubland; Gr: grassland)

Presence of cork oak persistence
(maintenance or increase in tree cover)
Absence of cork oak persistence
(absence or decrease in tree cover)
Type of transition % from the total sampling units classified as presence of oak persistence Type of transition % from the total sampling units classified as absence of oak persistence
Fo→Fo 48 Fo→Sr 33
Sa→Sa 13 Sa→Sr 17
Sa→Fo 13 Sa→Gr 8
Sr→Fo 9 Sr→Sr 17
Sr→Sa 4 Gr→Sr 17
Gr→Sa 13 Gr→Gr 8