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首页> 外文期刊>Journal of Molluscan Studies >A century after introduction: variability in Cepaea hortensis (Muller, 1774) in Sibiu, central Romania
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A century after introduction: variability in Cepaea hortensis (Muller, 1774) in Sibiu, central Romania

机译：介绍后的一个世纪：Cepaea Hortensis（Muller，1774）在罗马尼亚锡比乌的变异性

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摘要

The polymorphic land snail Cepaea hortensis was introduced to the city of Sibiu, central Romania, in the first decade of the 20th century and has spread widely across the city. A total of 97 locations were examined in 2017 across the city to determine the habitat preferences and variation in shell size, shape, colour and banding polymorphism of C. hortensis, and to relate these to the same features in the likely source population from Mannheim, Germany, and the first established population in Sibiu. We found that C. hortensis was largely restricted to sites with some woody vegetation cover and showed a marked preference for abandoned and overgrown private gardens. Mean adult shell size in present-day populations was almost always smaller than in both the presumed population of origin from Germany and the first recorded population from Sibiu. Populations showed a wide range of variation in frequencies of shell colours and banding morphs. This variation was not related to habitat or cover, and there was no evident geographical structure in the patterns. Comparisons with a smaller-scale sampling in 2004/5 showed that some populations had gone extinct, some remained stable and in some morph frequencies had changed drastically, but in no consistent direction. These results are similar to those obtained for the related species C. nemoralis in comparable circumstances, but differ from those obtained from regions where C. hortensis is long established and where habitats have been stable. The patterns we observed most likely reflect the effect of passive dispersal by humans, genetic drift and founder effects.
机译：在20世纪的第一个十年内，将多态土地蜗牛Cepaea Hortensis引入了罗马尼亚中部的锡比乌市，并在整个城市广泛传播。整个城市共审查了97个地点，以确定C. Hortensis的壳体大小，形状，颜色和带状多态性的栖息地偏好和变化，并将这些与来自Mannheim的可能源人群相同的特征相关，德国，以及锡比乌的第一个已建立的人口。我们发现C. Hortensis在很大程度上仅限于带有一些木质植被覆盖的地点，并为被遗弃和过度的私人花园显示出明显的偏好。当今人口的平均成人壳体大小几乎总是比德国的推定产地和来自辛迪的第一个录制的人口小。群体显示出壳体颜色和带状变形频率的广泛变化。这种变异与栖息地或覆盖无关，模式中没有明显的地理结构。 2004/5中具有较小规模抽样的比较显示，一些人群已经灭绝，有些人保持稳定，并且在一些变形频率发生巨大变化，但没有一致的方向。这些结果与在可比情况下与相关物种C. Nemoralis获得的结果类似，但与从C. Hortensis长期确定的地区获得的那些，栖息地稳定的那些不同。我们观察到的模式最有可能反映人类，遗传漂移和创始效果的被动分散的影响。

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  • 来源
    《Journal of Molluscan Studies》 |2019年第2期|共7页
  • 作者

    Gheoca Voichita; Benedek Ana Maria; Cameron Robert A. D.; Stroia Radu Camil;

  • 作者单位

    Lucian Blaga Univ Sibiu Fac Sci Appl Ecol Res Ctr 5-7 Dr Ioan Ratiu St Sibiu Romania;

    Lucian Blaga Univ Sibiu Fac Sci Appl Ecol Res Ctr 5-7 Dr Ioan Ratiu St Sibiu Romania;

    Univ Sheffield Dept Anim &

    Plant Sci Sheffield S10 2TN S Yorkshire England;

    Lucian Blaga Univ Sibiu Fac Sci Appl Ecol Res Ctr 5-7 Dr Ioan Ratiu St Sibiu Romania;

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  • 正文语种 eng
  • 中图分类 动物学;
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