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

Rabone, Muriel; Wiethase, Joris Hendrik; Allan, Fiona; Gouvras, Anouk Nathalie; Pennance, Tom; Hamidou, Amina Amadou; Webster, Bonnie Lee; Labbo, Rabiou; Emery, Aidan Mark; Garba, Amadou Djirmay; Rollinson, David

doi:10.1186/s13071-019-3745-8

Table 2 Snail survey species data broken down by locality, site type and month

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

	n	Bul.r	Bul	Bul+	BT.r	BT	BT+	BT.p	BF.r	BF	BF+	BF.p
Locality
Bangou Koirey	55	8.2	453	10	7.4	406	10	2.46	0.6	31	0	0.00
Diambala	250	30.1	7529	32	26.0	6506	32	0.49	3.7	914	0	0.00
Doguel Kaina	134	5.3	704	6	2.2	296	6	2.03	3.0	397	0	0.00
Dokimana	50	12.1	606	14	5.8	290	13	4.48	6.3	316	1	0.32
Gantchi Bassarou	59	1.3	75	5	0.1	3	0	0.00	1.2	72	5	6.94
Karma	87	6.2	542	2	1.5	128	2	1.56	4.7	409	0	0.00
Kohan Garantche	35	7.3	254	0	5.1	179	0	0.00	2.1	75	0	0.00
Koutoukale Zeno	130	20.8	2708	5	13.8	1789	5	0.28	6.7	867	0	0.00
Lata Kabia	179	22.6	4046	10	15.6	2787	9	0.32	7.0	1259	1	0.08
Libore	270	30.8	8320	150	24.8	6694	143	2.14	5.8	1565	7	0.45
Namari Goungou	233	54.1	12,594	11	47.2	10,987	9	0.08	6.6	1530	1	0.07
Namaro	99	10.2	1009	3	8.1	798	2	0.25	2.1	211	1	0.47
Say	94	7.3	683	1	2.7	258	1	0.39	4.3	402	0	0.00
Seberi	255	43.6	11,123	46	35.0	8929	43	0.48	8.6	2194	3	0.14
Tagabati	52	3.0	155	0	2.7	142	0	0.00	0.3	13	0	0.00
Tiaguirire	69	9.7	670	0	7.2	496	0	0.00	2.4	163	0	0.00
Tokoye	112	13.1	1470	60	10.0	1117	57	5.10	3.2	354	3	0.85
Yoreize Koira	102	4.3	437	0	0.6	66	0	0.00	3.6	371	0	0.00
Youri	99	8.6	850	3	5.0	497	2	0.40	3.6	352	1	0.28
Zama Koira Tegui	132	4.7	626	9	1.0	132	8	6.06	3.7	494	1	0.20
Total	2496	22	54,854	367	17.0	42,500	342	0.80	4.8	11,989	24	0.20
Site type
Canal 2	924	30.4	28,094	137	25.3	23,362	131	0.56	5.0	4590	5	0.11
Canal 3	715	28.5	20,349	114	22.0	15,715	112	0.71	6.3	4518	2	0.04
Pond	209	11.6	2422	81	6.4	1347	71	5.27	4.9	1024	10	0.98
Rice	215	7.7	1659	14	2.7	571	7	1.23	5.0	1078	7	0.65
River	208	5.3	1105	4	3.9	815	4	0.49	1.4	284	0	0.00
Rivulet	141	5.0	705	16	4.4	624	16	2.56	0.5	64	0	0.00
Spillway	84	6.2	520	1	0.8	66	1	1.52	5.1	431	0	0.00
Total	2496	22	54,854	367	17.0	42,500	342	0.80	4.8	11,989	24	0.20
Month
January	232	17.0	3951	17	14.7	3405	16	0.47	2.3	536	1	0.19
February	224	27.5	6157	66	21.9	4895	64	1.31	5.6	1261	2	0.16
March	216	47.4	10,242	109	38.6	8330	100	1.20	8.9	1913	9	0.47
April	41	56.2	2305	20	45.9	1882	20	1.06	10.3	423	0	0.00
May	185	30.6	5652	21	24.4	4522	20	0.44	6.1	1130	1	0.09
June	173	32.3	5592	52	26.0	4502	51	1.13	5.2	895	1	0.11
July	227	17.1	3887	22	14.2	3221	18	0.56	2.6	595	4	0.67
August	197	12.0	2355	4	7.8	1543	3	0.19	4.0	797	1	0.13
September	215	17.6	3782	8	9.4	2026	6	0.30	7.9	1704	2	0.12
October	279	12.7	3551	18	8.7	2433	16	0.66	4.0	1118	1	0.09
November	232	15.7	3648	11	12.1	2810	11	0.39	3.6	838	0	0.00
December	275	13.6	3732	19	10.7	2931	17	0.58	2.8	779	2	0.26
Total	2496	22	54,854	367	17.0	42,500	342	0.80	4.8	11,989	24	0.20

	BG	BS	BP.r	BP	BP+	BP.p	RN.r	RN
Locality
Bangou Koirey	16	0	0.0	0	0		1.3	70
Diambala	109	0	0.8	210	3	1.43	0.0	7
Doguel Kaina	11	0	0.0	0	0		0.6	78
Dokimana	0	0	0.0	0	0		7.3	365
Gantchi Bassarou	0	0	0.0	0	0		1.1	63
Karma	5	0	0.0	0	0		0.6	51
Kohan Garantche	0	0	0.0	0	0		0.1	3
Koutoukale Zeno	0	52	0.0	0	0		0.0	0
Lata Kabia	0	0	0.0	0	0		0.0	6
Libore	61	0	0.0	0	0		0.1	32
Namari Goungou	77	0	8.9	2080	76	3.65	6.1	1432
Namaro	0	0	0.0	0	0		0.1	12
Say	0	23	0.0	0	0		0.0	1
Seberi	0	0	0.0	0	0		0.0	1
Tagabati	0	0	0.0	0	0		0.3	15
Tiaguirire	11	0	0.0	0	0		0.3	23
Tokoye	0	0	0.0	0	0		2.0	225
Yoreize Koira	0	0	0.0	0	0		1.2	124
Youri	0	1	0.0	0	0		0.1	6
Zama Koira Tegui	0	0	0.0	0	0		0.1	16
Total	290	76	0.9	2290	79	3.45	1.0	2530
Site type
Canal 2	142	0	2.0	1819	46	2.53	0.1	53
Canal 3	116	0	0.7	471	33	7.01	2.2	1541
Pond	0	52	0.0	0	0		2.9	610
Rice	10	0	0.0	0	0		0.8	168
River	5	1	0.0	0	0		0.3	69
Rivulet	17	0	0.0	0	0		0.6	88
Spillway	0	23	0.0	0	0		0.0	1
Total	290	76	0.9	2290	79	3.45	1.0	2530
Month
January	10	0	1.1	262	10	3.82	0.6	134
February	0	1	2.9	656	13	1.98	2.5	554
March	0	0	3.0	646	10	1.55	4.0	870
April	0	0	2.0	80	5	6.25	9.0	368
May	0	0	0.8	154	5	3.25	0.8	156
June	195	0	0.6	102	9	8.82	0.8	137
July	0	71	0.1	15	2	13.33	0.3	74
August	11	4	0.1	16	0	0.00	0.1	23
September	52	0	0.4	78	2	2.56	0.1	15
October	0	0	0.1	25	2	8.00	0.1	20
November	0	0	0.9	206	17	8.25	0.1	25
December	22	0	0.2	50	4	8.00	0.6	154
Total	290	76	0.9	2290	79	3.45	1.0	2530

Abbreviations: n, total count i.e. total number of site visits per category (e.g. 84 records in total from site visits to spillway sites); Bul.r, total count divided by n; Bul, Bulinus spp. raw count; Bul+, Bulinus spp. total shedding i.e. positive for Schistosoma spp. infection; BT.r, B. truncatus count divided by n; BT, B. truncatus raw count, BT+, B. truncatus total positive for Schistosoma spp. infection; BT.p, B. truncatus prevalence; BF.r, B. forskalii count divided by n; BF, B. forskalii raw count; BF+, B. forskalii total positive for Schistosoma spp. infection; BF.p, B. forskalii prevalence; BG, B. globosus; BS, B. senegalensis; BP.r, Bi. pfeifferi total count divided by n; BP, Bi. pfeifferi raw count; BP+, Bi. pfeifferi positive for Schistosoma spp. infection; BP.p, Bi. pfeifferi prevalence; RN, R. natalensis; RN.r, total count divided by n

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ISSN: 1756-3305

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