2.5 Statistical analyses
We used ANOVA to test for a significant difference in the dietary
diversity and composition between different seasons. The frequency of
occurrence (the number of pellets containing that foods divided by the
total number of pellets in the species sample, FO) and the numbers of
foods during different seasons were compared statistically using
Dunnett’s T3 multiple comparisons test by SPSS 20.0 software. The
Manne−Whitney U test was also adopted to assess the difference in
relative abundance of food items between different seasons following our
previous study (Tang et al. 2019). Heat maps, box plots and taxa summary
bar charts were generated using the “ggplot2” package of R software
(Wickham 2009).