Abstract

Little is known about the distribution of dormouse species in the Middle Volga region. The habitats of the Edible Dormouse Glis glis L. and the Hazel Dormouse Muscardinus avellanarius L. are fragmented and mainly lost in the agricultural landscape of the right bank of the Volga River and in the coniferous forests of the right bank of the Lower Oka River in Nizhny Novgorod oblast. New data are given of features of the habitats of two sympatric dormouse species from a patch of a lime–oak forest surrounded by coniferous forests. Within the area studied, 80 wooden nestboxes were put up in places with well-connected tree canopies and well-developed understory. Over the three years of our study (2016–2018), preliminary data were obtained on the dynamics of nestbox use and the relative abundance and reproduction of both dormouse species. The patch of the lime–oak forest with an area of approximately 20 ha is divided into two parts by a road and a 50 m-wide glade. Both parts did not differ in vegetation, but the Edible Dormouse was found only in the southern part. The Hazel Dormouse was found throughout the whole lime–oak patch, except for woodplot no. 1 (1.5 ha), which was occupied by the Edible Dormice with a high density. On the basis of the data obtained, management actions are suggested to raise the level of connectivity and immigration in the population of isolated broad-leaved patches in coniferous forests, in particular, to develop a network of “key habitats.”

中文翻译：

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下诺夫哥罗德州两个寄居物种（格里科，啮齿类）的生境破碎化和阔叶林的生物多样性保护

摘要

关于伏尔加河中部地区睡鼠物种的分布知之甚少。食用睡鼠Glis glis L.和榛睡鼠Muscardinus avellanarius的栖息地L.被破碎，主要在下诺夫哥罗德州伏尔加河右岸的农业景观和下奥卡河右岸的针叶林中消失。给出了新的数据，该数据来自被针叶林包围的一片石灰橡木林中的两个同栖睡鼠物种的栖息地特征。在所研究的区域内，在树冠连接良好且地下空间发达的地方放置了80个木制巢箱。在我们研究的三年中（2016-2018年），获得了关于巢箱使用动态以及两种睡鼠物种相对丰度和繁殖的初步数据。石灰橡木森林面积约20公顷，被道路和50 m宽的林间空地分为两部分。这两部分的植被没有不同，但食用睡鼠仅在南部发现。榛树睡鼠在整个石灰橡木斑块中均被发现，除了木图号。1（1.5公顷），被高密度的食用睡鼠占据。根据获得的数据，建议采取管理措施以提高针叶林中孤立的阔叶斑块种群的连通性和移民水平，特别是建立“关键栖息地”网络。