Table 3. Analysis of covariance of shell crushing resistance by snail species using shell length as covariate.

Location	F	DF	P	Mn vs Nm	Mn vs Mc	Nm vs Mc
JS	6.49	2,56	0.003	0.315	0.014	0.002
CH	13.68	2,56	<0.0001	0.433	<0.001	<0.001
LRN	4.43	2,47	0.017	0.520	0.013	0.048
LRB	17.52	2,56	<0.0001	0.975	<0.001	<0.001
MEA	19.59	2,56	<0.0001	0.079	<0.001	0.001
MEB	11.22	2,66	<0.0001	0.004	0.103	< 0.001
MO	23.05	2,55	<0.0001	0.897	<0.0001	<0.0001
RM	11.35	2,56	<0.0001	0.018	<0.001	<0.001
TB	13.39	2,57	<0.0001	0.538	<0.0001	<0.0001
TCS	3.62	2,60	0.033	0.762	0.088	0.026
TCN	3.18	2,56	0.049	0.987	0.034	0.049

P-values of multiple comparisons among snail species are shown. Species specific size-adjusted crushing resistance values are shown in Table 2. Abbreviations are shown in Table 1.