Multivariate Analysis

The first function of the correspondence analysis (CCA) for the vegetation parameters of the Afrophlaeoba data set (including P. arachniformis) explained 64.7% of the variance and the second function 13.1% (Fig. 3). The grasshopper species were significantly correlated with the vegetation matrix (P < 0.001), but the resolution was relatively low (R2=0.106). The Afrophlaeoba species were plotted gradually along the first axis, while P. arachniformis was mainly found at patches with a great amount of leaf litter. For the complete data set (East Usambara grasshoppers combined with the Afrophlaeoba species), the CCA explained 68.6% of the variance and the second axis 31.4% (Fig. 4). Again, the species were significantly correlated with the vegetation data (P < 0.001), but with a greater resolution (R2=0.276). In the ordination plot (Fig. 4), the distance between the sympatric species was greater than between the Afrophlaeoba species.

Was this article helpful?

0 0

Post a comment