Fig. 4From: Bird diversity and waterbird habitat preferences in relation to wetland restoration at Dianchi Lake, south-west Chinat-value biplots of the five main environmental variables. a DF, b WL, c MF, d LG and e SB. The arrows indicated each sub species groups, and empty boxes represented environmental variables. The circles filled with gray color represented negative correlation while the transparent ones represented positive correlationBack to article page