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Fig. 5 | Ecological Processes

Fig. 5

From: Effect of complex hydraulic variables and physicochemical factors on freshwater mussel density in the largest floodplain lake, China

Fig. 5

Correlation between density of freshwater mussel species and hydraulic (a, b) and physicochemical variables (c, d) based on heat map analysis and redundancy analysis (RDA). The clustering dendrograms of heat maps including the distance metrics of density of freshwater mussel species, hydraulic and physicochemical variables used to produce it. Horizontal coordinates are hydraulic and physicochemical variables in heat map analysis, vertical coordinates are density of freshwater mussel species. Red shows positive correlation between density of freshwater mussel species and hydraulic and physicochemical variables. Blue shows negative correlation between density of freshwater mussel species and hydraulic and physicochemical variables. The color patch gradient is used to show the value of R2. The clustering dendrograms on the left and top are the result of clustering of species density (left), hydraulic and physicochemical variables (top), respectively. Significant results are in * (*p < 0.05; **p < 0.01; *** p < 0.001). Dissolved oxygen (DO; mg/L), hydrogen ions (pH), salinity (Sal; mg/L), turbidity (TURB; NTU), and water temperature (T; °C), chlorophyll-a (Chl-a; mg/L), water velocity (V; m/s), water depth (WD; m), Total nitrogen (TN; mg/L) and total phosphorus (TP; mg/L), D (mm), Sorting index (So, unitless), Bed roughness (ks, mm), Froude number (Fr, unitless), Reynolds number (Re, unitless), Boundary Reynolds number (Re*, unitless), Shear velocity (V, m/s), Shear stress (τ, N/m2), Critical shear stress (τc, N/m2). Code of freshwater mussel species see Additional file 2: Table S2

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