Freshwater snails of biomedical importance in the Niger River Valley: evidence of temporal and spatial patterns in abundance, distribution and infection with Schistosoma spp.

Table 3 Summary statistics of all glmmTMB models for B. truncatus and B. forskalii abundance, reporting χ² df and P-values, all negative binomial apart from binomial for prevalence models

Term	B. truncatus			BT positive			BT prevalence			B. forskalii			BF positive			BF prevalence
Term	χ ²	df	P	χ ²	df	P	χ ²	df	P	χ ²	df	P	χ ²	df	P	χ ²	df	P
Precipitation	0.4	1	0.548							0.6	1	0.427
Site type	33.2	6	< 0.0001	15	6	0.02	92.9	6	< 0.0001	27.8	6	< 0.0001	4.3	7	0.742	9.5	7	0.219
Locality	107	18	< 0.0001	41.7	19	0.002	139.4	13	< 0.0001	34	19	0.018	2	19	1	13.5	9	0.139
Month	85.4	11	< 0.0001	62.3	11	0	18.9	11	0.063	32.4	11	0.001	0.1	1	0.781	29.4	11	0.002
BT positive total	33.8	1	< 0.0001
BF positive total										2.4	1	0.119

Key: Headers: names for given model, BT/BF positive: model of abundance of shedding snails for B. truncatus, B. forskalii and Bi. pfeifferi, respectively; BT/BF prevalence: model of Schistosoma spp. prevalence (proportion of snails shedding) in the given species; precipitation, WMO weather station precipitation data

ISSN: 1756-3305