Ferrer López J R, Perera de Puga G, Cong M Y, Amador Ravelo O
Rev Cubana Med Trop. 1989 Sep-Dec;41(3):341-54.
A study of the density of river mollusks in six watercress groves is made. It is seen how densities of F. cubensis, intermediate host of fascioliasis in Cuba, is maintained with relative stability. The poor effectiveness of P. duryi as an agent of biologic control is demonstrated. The high density of P. cubensis, which seems to exert a certain regulatory effect on F. cubensis--particularly in the months of reproductive peaks (August and September)--is emphasized. Densities of B. havanensis and B. helophila may be affected by the density of F. cubensis and P. cubensis, which may exert certain influence in the decrease of pulmonate density. F. cubensis and P. parvulus are morphometrically compared and a high correlation between length and width of the shell (r = 0.9) is emphasized; such correlation was smaller in P. parvulus (r = 0.7).
对六个水田芥种植园中的河螺密度进行了研究。观察了古巴肝片吸虫病中间宿主古巴小泡螺的密度如何保持相对稳定。证明了杜氏扁螺作为生物防治剂的效果不佳。强调了古巴扁螺的高密度，它似乎对古巴小泡螺有一定的调节作用——尤其是在繁殖高峰期（8月和9月）。哈瓦那扁螺和嗜喜扁螺的密度可能受古巴小泡螺和古巴扁螺密度的影响，这可能对肺螺类密度的降低有一定影响。对古巴小泡螺和微小扁螺进行了形态测量比较，并强调了壳长与壳宽之间的高度相关性（r = 0.9）；微小扁螺的这种相关性较小（r = 0.7）。
