2.3.2. Generalised Linear Models
GLM were used to examine the effect of habitat heterogeneity on bird species richness using the
statistical software GenStat 12.1 [50]. GLM assumes independent or at least uncorrelated observations
which were identified using PCA in this study [51]. Because the numbers of bird species observed are
counts, GLM were based on a Poisson distribution with a log (ln) link function.