2.6 Statistical analyses
Depending on normality and homoscedasticity of data, either t.test or Mann-Whitney U -test was used to compare the results of
the indices VI, SF, Levin’s index and symmetric niche overlap of exoticO. niloticus and native C. rendalli species (Sokal &
Rohlf, 1995). These statistical analyses were performed using R software
version 3.6.0 (R Core Team, 2019).