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Multi‐Scale Assessment of Male Northern Yellow Bat Roost Selection
Journal of Wildlife Management ( IF 2.3 ) Pub Date : 2020-02-25 , DOI: 10.1002/jwmg.21843
Steven B. Castleberry 1 , Craig R. Bland 1 , Jacalyn M. Beck 2 , Elizabeth Kurimo‐Beechuk 1 , Katrina M. Morris 3 , Jeff Hepinstall‐Cymerman 1
Affiliation  

Knowledge of roost selection by northern yellow bats (Lasiurus intermedius) is limited to a small number of known roost locations. Yet knowledge of basic life history is fundamental to understanding past response to anthropogenic change and to predict how species will respond to future environmental change. Therefore, we examined male northern yellow bat roost selection on 2 Georgia, USA, barrier islands with different disturbance histories. Sapelo Island has a history of extensive disturbance and is dominated by pine (Pinus spp.) forests; Little Saint Simons Island has a limited disturbance history with maritime oak (Quercus spp.) forest as the dominant cover type. From March–July 2012 and 2013, we radio‐tracked 35 adult male northern yellow bats to diurnal roosts and modeled roost characteristics at the plot and landscape scales. We located 387 roosts, of which 95% were in Spanish moss (Tillandsia usneoides) hanging in hardwood trees. On both islands, bats selected roost trees with larger diameters than surrounding trees and selected roost locations with greater open flight space (i.e., low midstory clutter) underneath. Roosts were located farther from open areas on Sapelo and closer to fresh water on Little Saint Simons compared to random locations. Lower availability of hardwood forest on Sapelo may have resulted in small‐scale roost site selection (i.e., plot level) despite potential increased costs of commuting to water and open areas for foraging. In contrast, greater availability of hardwood forest on Little Saint Simons likely allowed selection of roosts closer to fresh water, which provides foraging and drinking opportunities. Our results indicate that mature hardwood trees in areas with low midstory clutter are important in male northern yellow bat roost selection, but landscape‐level features have varying influences on roost selection, likely as a result of differences in disturbance history. Therefore, management will differ depending on the landscape context. Further research is needed to examine roost selection by females, which may have different habitat requirements. © 2020 The Wildlife Society.

中文翻译:

男性北方黄蝙蝠栖息地选择的多尺度评估

北部黄色蝙蝠(Lasiurus intermedius)对栖息地选择的了解仅限于少数已知的栖息地。然而,基本的生活史知识对于理解过去对人为变化的反应以及预测物种对未来环境变化的反应至关重要。因此,我们研究了美国佐治亚州2个屏障历史不同的雄性北方雄性蝙蝠的栖息地选择。萨佩洛岛(Sapelo Island)有广泛的扰乱历史,以松树林(Pinus spp。)为主;小圣西蒙斯岛的海上橡木桶骚扰历史有限(栎属spp。)森林作为主要覆盖类型。在2012年3月至7月之间,我们对35只成年雄性北黄蝙蝠进行了昼夜栖息地无线电跟踪,并在样地和景观尺度上模拟了栖息地特征。我们找到了387个栖息地,其中95%位于西班牙的苔藓(铁兰))挂在硬木树上。在这两个岛上,蝙蝠都选择了直径比周围树木大的栖息树,并在下面选择了具有较大开放飞行空间(即中层低杂波)的栖息地。与随机位置相比,栖息地离Sapelo的空旷区域更远,而在Little Saint Simons的离淡水更近。尽管可能增加通勤水和觅食的通勤成本,但Sapelo硬木林的可利用性较低可能导致小规模的栖息地选择(即地块水平)。相比之下,小圣西蒙地区硬木森林的可利用性可能允许选择接近淡水的栖息地,从而提供觅食和饮水的机会。我们的结果表明,中层杂波低的地区成熟的硬木树对于雄性北黄蝙蝠的栖息地选择很重要,但是景观水平特征对栖息地的选择有不同的影响,这可能是由于干扰历史的不同所致。因此,管理将取决于景观环境而有所不同。需要进一步研究以检查雌性对栖息地的选择,雌性对栖息地的要求可能不同。©2020野生动物协会。
更新日期:2020-02-25
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