Fig. 3From: Area, isolation, disturbance and age effects on species richness of summer waterbirds in post-mining subsidence lakes, Anhui, ChinaLinear regression of summer waterbird species richness against 38 post-mining subsidence lakes’ area (a), disturbance (b), isolation (c) and lake age (d), Anhui, China, 2016. Figures with black line showed independent variable has a significant effect on species richness (p < 0.05)Back to article page