Environmental and biotic factors affecting freshwater snail intermediate hosts in the Ethiopian Rift Valley region

Table 3 The frequency and percentages of the categorical predictor variables used to assess the occurrence and abundance freshwater snail species in the Ethiopian Rift Valley

Predictor variable	Category	Tropical rainy climate zone		Warm temperate rainy climate zone
Predictor variable	Category	Frequency	Percentage	Frequency	Percentage
Emergent macrophyte cover	Very low	32	34	11	13
	Low	13	14	7	8
	Moderate	15	16	25	29
	High	19	20	13	15
	Very high	10	11	29	34
Submerged macrophyte cover	Very low	44	47	40	47
	Low	45	48	44	52
	Moderate	0	0	0	0
	High	0	0	0	0
	Very high	0	0	1	1
Floating macrophyte cover	Very low	30	32	30	35
	Low	38	41	40	47
	Moderate	9	10	7	8
	High	6	7	3	4
	Very high	6	75	5	6
Substrate type	Grass	50	56	72	85
	Silt	25	28	7	8
	Detritus	14	16	6	7
Predators occurrence	Absent	6	6	6	7
Predators occurrence	Present	83	86	79	85
Competitors occurrence	Absent	87	90	81	87
Competitors occurrence	Present	2	2	4	4
Farming	Absent	71	80	62	73
Farming	Present	18	20	23	27
Solid waste dumping	Absent	82	92	69	81
Solid waste dumping	Present	7	8	16	19
Grazing	Absent	52	58	34	40
Grazing	Present	37	42	51	60
Silviculture	Absent	73	82	64	75
Silviculture	Present	16	18	21	25
Drainage of land	Absent	80	90	73	86
Drainage of land	Present	9	10	12	14
Open defecation	Absent	86	97	77	91
Open defecation	Present	3	3	8	9
Effluent discharge	Absent	88	99	83	98
Effluent discharge	Present	1	1	2	2
Fishing	Absent	75	84	70	82
Fishing	Present	14	16	15	18
Bathing and swimming	Absent	80	90	72	85
Bathing and swimming	Present	9	10	13	15
Clothes washing	Absent	81	91	71	84
Clothes washing	Present	8	9	14	17
Car washing	Absent	85	96	84	99
Car washing	Present	4	5	1	1
Boating	Absent	82	92	84	99
Boating	Present	7	8	1	1
Settlement	Absent	63	71	79	93
Settlement	Present	26	29	6	7

ISSN: 1756-3305