Changes in species richness and composition of boreal waterbird communities: a comparison between two time periods 25 years apart.

Results Changes at community and guild levels In general, species richness in local communities was lower in 2016 than in 1990/1991, although the difference was not quite significant when controlling for multiple comparisons (Fig. 1a ; Wilcoxon signed-rank test, Z = −2.263, p = 0.024; the critical p - value using the B-Y method is p = 0.0219).

also in 653 other papers