3.4. Disappearance and appearance trends related to orchid ecology
Based on null model 2, SESdisp was positive for 27 species and significant for 13 of them, with the highest value of disappearance for Anacamptis coriophora subsp. coriophora(P < 0.001, Table 2). SESapp was found to be positive for 31 species and significant for 11 of them, with the highest value for A. papilionacea subsp. papilionacea (P < 0.001, Table 2). SESdisp was significant for seven species of humid zones (wetland and humid grassland), three species of forest and shrubland, and three species of dry grassland, whereas the SESapp was significant for nine species of forest and shrubland, and two species of humid zones (Table 2). However, no significant differences of SESdisp and SESapp were detected among species of different habitat types (Tukey test, P > 0.05). Note that three species (A. papilionacea subsp. papilionacea, A. palustris and Ophrys speculum) are concerned by both significant disappearance and appearance ( Table 2).
Table 2.