钉螺在水体中运动特征的实验研究

EXPERIMENTAL STUDY ON THE BIOLOGICAL FEATURES OF MOVEMENT OF ONCOMELANIA SNAILS IN THE WATER BODY

目的：阐明钉螺在静水与动水中的运动方式与特征，探索新的防止钉螺扩散的途径。方法：运用水力学、泥沙运动力学和钉螺生物学的理论和方法。结果：首次提出钉螺在水中运动状态－流速关系的阈值，获得有关钉螺运动特征的５个参数，并推导出相应的７个数学公式。结论：提供了研究钉螺在水体中的运动特征。

AIM: To clarify the mode and features of dispersal movement of Oncomelania snails in the static and running water and to explore new approaches of controlling snail dispersal. METHOD: The study was performed by using the methods and theories on hydraulics, silt motion mechanics and snail biology. RESULTS: The threshold value of the relationship between the snail movement in the running water and the water current velocity was obtained for the first time. Meanwhile, five parameters that indicate the movement characteristics of the snails in the water body including the snail sedimentation rate in static water (range: 0.94- 17.1 cm/s), the snail sedimentation rate in running water (range: 8.6- 43.7 cm/s),and the current velocity for starting movement of snails (range: 30- 40 cm/s) were obtained and seven relevant mathematical formulas were deduced. CONCLUSION: The features of the movement of snails in the water body were provided.