Table 1. Viper occurrence data (N) and Partial ROC analyses results (Mean Ratio = MR, standard deviation = SD, significance = P).

		Partial ROC
Species	N	MR	SD	P
A. nummifer	14	1.977	0.008	<0.001***
B. asper	273	1.406	0.029	<0.001***
C. atrox	851	1.262	0.025	<0.001***
C. intermedius	15	1.449	0.078	<0.001***
C. molossus	336	1.146	0.018	<0.001***
C. ravus	41	1.340	0.095	<0.001***
C. simus	53	1.660	0.035	<0.001***
C. totonacus	24	1.964	0.004	<0.001***
C. triseratus	58	1.938	0.029	<0.001***
Total	1665		-	-

*** = <0.001, ** = <0.01, * = <0.05.