当暴露于它们的两宿主的度可变的上热极限时,肠道微生物在很大程度上没有变化
Grace J Vaziri1, Bryanna Caicedo1, Nicole Dahrouge2
1University of Connecticut, Department of Ecology and Evolutionary Biology, 75 North Eagleville Road, Storrs, CT 06269, United States of America.
概括
气候变化对温度极端的影响. 来自更高度的木的热耐受性降低,但它们的肠道微生物组在很大程度上不受短暂的热暴露的影响.
科学领域:
- 生态生态学 生态生态学
- 环境生理学环境生理学
- 微生物组研究 微生物组研究
背景情况:
- 气候变化正在增加极端温度,可能影响宿主微生物群相互作用.
- 肠道微生物组影响宿主生理学,而外热微生物组对逐渐变暖很敏感.
- 急性热应激对宿主微生物群的影响,特别是在临界热极限时,尚不清楚.
研究的目的:
- 为了研究急性热应激 (CTmax) 对木 (Lithobates sylvaticus) 的肠道微生物群的影响.
- 为了确定热耐受度的度变化是否会影响微生物对热的反应.
- 评估恢复时间的热后暴露对肠道微生物群特征的影响.
主要方法:
- 在横跨度梯度的木中测试的临界热最大值 (CTmax).
- 在CTmax暴露后的两个时间点的特征性肠道微生物群组成和稳定性.
- 青之间微生物组指标的比较,具有不同的恢复时间和热容忍度.
主要成果:
- 来自高度的木的CTmax较低,而来自低度的木的CTmax则较低.
- 对CTmax的急性暴露对肠道微生物群的丰富性,稳定性或组成产生了最小的可检测影响.
- 微生物群的多样性下降,而稳定性随着更长的恢复期 (4天而不是1天) 而增加,而不管暴露于热量.
结论:
- 在木中存在热耐受度的度变化,但它们的肠道微生物群体表现出对短暂的高温压力有弹性.
- 压力后恢复时间,而不是热量暴露本身,显著影响肠道微生物群的稳定性和多样性.
- 这些发现表明,在急性压力条件下,宿主生理界限可能比它们的相关肠道微生物群对变暖更敏感.
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