Example of field observations at typical schistosomiasis transmission sites.

The measurements and estimates in the field were taken in the study site Ziniaré in Burkina Faso during the dry season in March 2011. NA indicates that this measure was not applicable. The typical transmission sites are illustrated in Fig 2. The habitat variable vegetation coverage was assessed based on the standard FAO LCCS form, flow velocity was categorized based on visual inspection, water temperature was measured using a hand-held digital thermometer, and estimation of the overall suitability of the transmission site resulted from knowledge on habitat preferences of species from the literature.

本研究于2011年3月旱季期间，在布基纳法索齐尼亚雷（Ziniaré）研究样地开展了野外实地测量与评估工作。NA表示对应测量项不适用。典型传播位点详见图2。生境变量中的植被覆盖度，依据联合国粮食及农业组织（Food and Agriculture Organization of the United Nations，FAO）土地覆盖分类系统（Land Cover Classification System, LCCS）标准表格进行评估；流速通过目视观测完成分级；水温采用手持式数字温度计进行测定；传播位点整体适宜性的评估，则基于文献中记载的物种生境偏好相关知识得出。