Several species of bats have faced strong population declines in Europe during the last century. However, an increase in some bat populations has been recently found in some parts of western Europe. We monitored wintering bats in the underground caves of north-western Italy (Piedmont, Valle d’Aosta and Liguria regions), with the aim of estimating long-term population variations. Over 28 years (from 1992 to 2019), 52 hibernation sites were monitored where 14 species of bats were present. Altogether, 97% of individuals belonged to Rhinolophus euryale, Rhinolophus ferrumequinum, Rhinolophus hipposideros, Barbastella barbastellus, Myotis emarginatus, and to the large Myotis group (Myotis myotis/blythii). We found a positive population trend for these six most common species with an average annual increase ranging between 3.5% (R. ferrumequinum) and 15.0% (B. barbastellus), which is in congruence with what has occurred in central and western Europe in the last 20 years. The species R. hipposideros showed a significant increase during the first 10 years, followed by a stable trend thereafter.

在上个世纪，几种蝙蝠在欧洲的种群数量急剧下降。但是，最近在西欧的某些地区发现一些蝙蝠的数量有所增加。我们监测了意大利西北部（皮埃蒙特，瓦莱达奥斯塔和利古里亚地区）地下洞穴中的越冬蝙蝠，目的是估计长期的人口差异。在过去的28年中（从1992年到2019年），对52个冬眠场所进行了监视，那里有14种蝙蝠。总之，个人的97％属于菊头芡，菊头ferrumequinum，菊头蹄，Barbastella barbastellus，鼠耳emarginatus，并以大鼠耳组（Myotis myotis / blythii）。我们发现这六个最常见物种的种群呈正增长趋势，年均增长在3.5％（R. ferrumequinum）和15.0％（B. barbastellus）之间，这与中欧和西欧的情况一致。最近20年。在最初的10年中，河马R. hipposideros物种显示出显着增加，此后呈稳定趋势。