Table 2. A regression analysis between metal distributions in the selected specimens.

Species and metals	Regression equation	Standard error	Pearson’s r	P values	R2 (%)
A. bato
As	y = 8.66+0.99x	0.404	0.774	0.070	58.1
Pb	y = 11.88+0.09x	0.511	0.088	0.867	0.8
Cd	y = 13.44–0.31x	5.166	-0.029	0.955	0.01
Cr	y = 12.70+0.16x	1.25	0.063	0.904	0.4
Cu	y = 11.56+0.11x	0.168	0.313	0.545	9.8
P. chinensis
As	y = 4.19 + 0.55x	0.449	0.522	0.287	27.3
Pb	y = 5.14 + 0.13x	0.243	0.257	0.621	6.6
Cd	y = 5.72 + 2.81x	3	0.425	0.4	18.1
Cr	y = 5.75 + 0.34x	0.8	0.205	0.695	4.2
Cu	y = 4.58 + 0.18x	0.157	0.502	0.309	25.3
L. parsia
As	y = -0.96 + 0.73x	0.16	0.914	0.01	83.7
Pb	y = 7.79 + 0.84x	0.711	0.51	0.301	26.0
Cd	y = 0.12 + 0.03x	0.036	0.378	0.459	14.3
Cr	y = 1.86 + 0.2x	0.139	0.58	0.227	33.7
Cu	y = 4.24 + 0.72x	0.346	0.719	0.107	51.7
M. cephalus
As	y = 2.08+0.11x	0.09	0.5	0.311	25.0
Pb	y = 23.98–0.42x	0.309	-0.557	-0.557	31.0
Cd	y = 0.87–0.02x	0.016	-0.547	0.26	30.0
Cr	y = 4.04–0.03x	0.075	-0.217	0.68	4.7
Cu	y = 16.95–0.21x	0.257	-0.364	0.477	13.3
H. limbatus
As	y = -4.63+0.89x	0.309	0.821	0.045	67.5
Pb	y = 1.09+1.156x	0.778	0.596	0.211	35.6
Cd	y = 0.36–0.001x	0.048	-0.014	0.978	0.01
Cr	y = -0.6+0.38x	0.238	0.620	0.189	38.5
Cu	y = 2.54+0.91x	0.749	0.519	0.291	26.9
T. toli
As	y = 0.48+ 0.16x	0.059	0.8	0.05	63.9
Pb	y = 3.74+0.32x	0.012	0.997	1.11E-5	99.5
Cd	y = 0.35–0.01x	0.013	-0.042	0.936	0.2
Cr	y = -1.22+ 0.14x	0.08	0.662	0.152	43.8
Cu	y = 0.37 + 0.34x	0.237	0.581	0.227	33.7