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Variation in Physiological Stress between Bridge- and Cave-Roosting Brazilian Free-Tailed Bats

机译:栖于栖于洞中的巴西无尾蝙蝠之间的生理压力变化

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Abstract: Since the late 1980s, Brazilian free-tailed bats (Tadarida brasiliensis) have increasingly used bridges as roosts in the southern United States. We examined differences in blood cortisol levels, body condition, and parasite load, as measures of physiological stress in bats roosting in bridges and bats roosting in caves. We collected data during three periods, coinciding with female phases of reproduction. For all measures, bats were captured during the nightly emergence from the roost and immediately sampled. Cortisol levels were significantly higher during pregnancy and lactation and in individuals with lower body-condition scores (length of forearm to mass ratio) and significantly higher in bats roosting in caves than in those roosting in bridges. Thus, we concluded that individuals of this species that roost in bridges are not chronically stressed and seem to be unaffected by human activities present at bridges. This is a rare documented instance where a human-dominated environment does not appear to be adversely affecting the physiological health of a free-ranging animal.
机译:摘要:自1980年代后期以来,巴西的无尾蝙蝠(Tadarida brasiliensis)在美国南部越来越多地将桥梁用作栖息地。我们检查了血皮质醇水平,身体状况和寄生虫负荷的差异,以此作为蝙蝠栖息在桥梁和蝙蝠栖息在洞穴中的生理应激指标。我们在三个时期收集数据,这与女性生殖阶段相吻合。对于所有措施,蝙蝠都是在夜间从栖息地中捕获的,并立即对其进行采样。在怀孕和哺乳期间以及身体状况评分较低(前臂长度与质量之比)较低的个体中,皮质醇水平显着较高,而在洞穴中栖息的蝙蝠中的皮质醇水平明显高于在桥梁中栖息的蝙蝠。因此,我们得出的结论是,栖居于桥梁中的该物种的个体不会受到长期压力,似乎不受桥梁中人类活动的影响。这是极少数有记录的实例,其中以人为主导的环境似乎对放养动物的生理健康没有不利影响。

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