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The Distribution of Fox Squirrel (Sciurus niger) Leaf Nests within Forest Fragments in Central Indiana

机译：福克斯松鼠（sciurus niger）叶片的分布在印第安纳州中部的森林碎片中筑巢

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We examined the abundance and placement of leaf nests by fox squirrels in six urban woodlots in central Indiana ranging in size from 1.06 to 8.28 ha. Four of the woodlots were disturbed, or subject to extensive human impact, whereas the remaining two were nature preserves. We counted all leaf nests present in each woodlot and recorded nest tree characteristics. We then conducted a quantitative vegetation analysis of trees present and estimated percentages of herbaceous and shrub cover along a minimum of two 100 m transects at each site. Fox squirrels showed a preference to build nests in certain species of trees. However, preference for nest tree species was not consistent across sites. Fox squirrels preferred to build nests in large trees with vines in the canopy at all sites. Characteristics of nests and nest trees did not differ among sites, but nest density was greater in the disturbed sites compared to the nature preserve sites. The nature preserve sites differed from the disturbed sites only with regard to the amount of shrub and herbaceous cover; shrub cover was greater and herbaceous cover was less at the disturbed sites. Results of this study suggest that fox squirrels are flexible with regard to nest tree species used and that the choice of a nest tree is dependent, in part, on tree size and the presence of vines. Further, a higher density of leaf nests in disturbed woodlots suggests that habitat disturbance and fragmentation due to urbanization may not have detrimental effects on the abundance and persistence of fox squirrels.
机译：我们研究了印第安纳州中部6个城市林地中狐松鼠的巢巢数量和位置，其大小从1.06到8.28公顷不等。四个林地受到干扰，或受到广泛的人类影响，而其余两个则是自然保护区。我们计算了每个林地中存在的所有叶巢，并记录了巢树的特征。然后，我们在每个站点至少两个100 m样带进行了对树木的定量植被分析，并估计了草本和灌木覆盖的百分比。狐狸松鼠表现出偏好在某些树种上筑巢。但是，在不同地点对巢树物种的偏好不一致。狐狸松鼠更喜欢在所有地点的树冠上都筑有葡萄树。巢和巢树的特征在不同地点之间没有差异，但是与自然保护区相比，受干扰地点的巢密度更高。自然保护区和受干扰区的区别仅在于灌木和草本覆盖物的数量。在受干扰的地方灌木覆盖较大，而草本覆盖较少。这项研究的结果表明，狐狸松鼠在所使用的巢树种类方面是灵活的，而巢树的选择部分取决于树的大小和藤蔓的存在。此外，受干扰的林地中较高的叶巢密度表明，由于城市化引起的栖息地干扰和破碎化可能不会对狐松鼠的数量和持久性产生不利影响。

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