The aim of this study was to investigate vertical migration behaviors in two species of hygrophilous micro‐snails, Vertigo moulinsiana and Vertigo angustior, in relation to the time of the year (spring and summer) at two sites that differ in ground water level (periodically inundated site and non‐inundated site). The study shows different patterns of vertical migrations in the studied species. Vertigo angustior demonstrated a strong affinity to the litter layer (a weak tendency for vertical movements), independent of the time of year and site studied. By contrast, V. moulinsiana showed a clear tendency for vertical migrations, which differed depending on the time of year and site. These differences may be related to the spatial segregation of microhabitats used by these two species at the sites studied and to differences in the ability to resist inundation. Vertigo angustior is associated with microhabitats which are not subjected to prolonged inundation and tolerates a brief submersion. The periodic character of vertical migrations may suggest the effect of endogenous factors related to reproduction in V. moulinsiana. Some plasticity of this behavior in relation to habitat conditions demonstrated by this species may be an adaptation to live in unpredictably flooded environments.

中文翻译：

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与一年中的时间和栖息地类型相关的两种吸水微蜗牛物种的垂直迁移

这项研究的目的是调查在两种地下水位不同的地点（春季和夏季）相对于一年中的时间（春季和夏季），两种潮性微蜗牛Vertigo moulinsiana和Vertigo angustior的垂直迁移行为。受淹站点和非受淹站点）。研究显示了所研究物种的垂直迁移的不同模式。Vertigo angustior对垫料层表现出强烈的亲和力（垂直运动趋势较弱），与一年中的时间和研究地点无关。相反，V。moulinsiana表现出明显的垂直迁移趋势，根据年份和地点的不同而不同。这些差异可能与这两个物种在研究地点使用的微生境的空间隔离以及抵抗淹没能力的差异有关。眩晕与微生境有关，这些微生境不会长期淹没，并且可以短暂浸没。垂直迁移的周期性特征可能暗示了与V. moulinsiana繁殖有关的内源性因素的影响。这种行为与该物种所表现出的栖息地条件有关的某些可塑性可能是适应在无法预料的洪水环境中生活。