Grisolia M L, de Freitas J R
Mem Inst Oswaldo Cruz. 1985 Apr-Jun;80(2):237-44. doi: 10.1590/s0074-02761985000200016.
Samples of water and snails collected through aleatory scoops in a small dam were done to obtain data concerning the physical and chemical characteristics of the water and their possible influence on biological aspects of the life cycle of snails. Among the 17 analysed parameters, Alkalinity and Conductivity showed a positive correlation with the density of B. tenagophila (r = +0.224 and r = +0.290), while CO2 and Acidity were negatively correlated with this populacional parameter (r = -0.592 and 0.601). Alkalinity and Total Hardness values were slightly higher than 100 mg/l CaCO3. Chlorides and Conductivity showed means of 94.9 +/- 38.7 and 680.1 +/- 643 microS/cm; these values are very high for that region. Other factors like pH and OD are according to the pattern for provision untreated waters. The density of B. tenagophila declined in the 6th month after a long period of torrential rains and in the rainy summers. In the colder months of the following year the density was higher (until 124 individuals/months/90 scoops). The monthly mean of the diameters of the snails was always larger than 13 mm, reaching 21.4 +/- 4.1 mm, but the mode was about 17 mm. There was no correlation between diameter/density (r = 0.037) and density/temperature (r = 0.065).
在一个小型水坝中通过随机采样收集水和蜗牛样本，以获取有关水的物理和化学特性及其对蜗牛生命周期生物学方面可能影响的数据。在17个分析参数中，碱度和电导率与嗜气管螺的密度呈正相关（r = +0.224和r = +0.290），而二氧化碳和酸度与该种群参数呈负相关（r = -0.592和0.601）。碱度和总硬度值略高于100mg/l碳酸钙。氯化物和电导率的平均值分别为94.9±38.7和680.1±643微西门子/厘米；这些值在该地区非常高。其他因素如pH值和溶解氧符合未经处理水的模式。在长时间暴雨后的第6个月以及多雨的夏季，嗜气管螺的密度下降。在次年较冷的月份，密度较高（直至124只个体/月/90次采样）。蜗牛直径的月平均值始终大于13毫米，达到21.4±4.1毫米，但众数约为17毫米。直径/密度（r = 0.037）和密度/温度（r = 0.065）之间没有相关性。
