Fig. 4.

a Bulinus truncatus and B. forskalii modelled mean abundance by locality, a significant predictor of abundance for both species: B. truncatus (χ² = 107, df = 18, P < 0.001); B. forskalii (χ² = 34, df = 19, P < 0.001). b B. truncatus and B. forskalii modelled mean abundance by site type, a significant predictor of abundance for both species: B. truncatus (χ² = 33.2, df = 6, P < 0.001); B. forskalii (χ² = 27.8, df = 6, P < 0.001). c B. truncatus and B. forskalii modelled mean abundance by month, a significant predictor of abundance for both species: B. truncatus (χ² = 85.4, df = 11, P < 0.001); B. forskalii (χ² = 32.4, df = 11, P < 0.001. Bk Bangou Koirey, Di Diambala, Dk Doguel Kaina, Do Dokimana, Gb Gantchi Bassarou, Ka Karma, Kg Kohan Garantche, Kz Koutoukale Zeno, Li Libore, Lk Lata Kabia, Na Namaro, Ng Namari Goungou, Sa Say, Se Seberi, i Tagabati, Ti Tiaguirire, To Tokoye, I Yoreize Koira, Yo Youri, Zk Zama Koira Tegui, canal.2 secondary irrigation canal, canal.3 tertiary irrigation canal; rice rice paddy