Exploring climate-related gut microbiome variation in bumble bees: An experimental and observational perspective

IF 4.4 2区 环境科学与生态学 Q1 ECOLOGY
Ecology Pub Date : 2025-03-24 DOI:10.1002/ecy.70066
Fabienne Maihoff, Lukas Bofinger, Kristof Brenzinger, Alexander Keller, Alice Classen
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引用次数: 0

Abstract

Rising temperatures negatively affect bumble bee fitness directly through physiological impacts and indirectly by disrupting mutualistic interactions between bees and other organisms, which are crucial in determining species-specific responses to climate change. Gut microbial symbionts, key regulators of host nutrition and health, may be the Achilles' heel of thermal responses in insects. They not only modulate biotic interactions with plants and pathogens but also exhibit varying thermal sensitivity themselves. Understanding how environmental changes disrupt microbiome communities is a crucial first step to determine potential consequences for host population responses. We analyzed gut bacterial communities of six bumble bee species inhabiting different climatic niches along an elevational gradient in the German Alps using 16S ribosomal DNA amplicon sequencing. We first investigated whether inter- and intraspecific differences in gut bacterial communities can be linked to species' elevational niches, which differ in temperature, flower resource composition, and likely pathogen pressure. A reciprocal translocation experiment between distinct climatic regions tested how the gut bacterial communities of Bombus terrestris and Bombus lucorum change short-term when exposed to new environments. Finally, we exposed these species to heat and cold wave scenarios within climate chambers to disentangle pure temperature-driven effects on the microbiome from other environmental effects. Interspecific variation in microbiome composition exceeded intraspecific variation. Species exhibit varying levels of gut microbiome stability, where stability is defined as the within-group variance: lower stability, indicated by greater within-group variance, is predominantly observed in species inhabiting higher elevations. Transplanted species showed subtle short-term gut microbiome adjustments, marked by an increase in Lactobacillaceae upon exposure to warmer regions; however, the gut microbiomes of these bumble bees did not change under laboratory temperature scenarios. We conclude that marked differences in the gut microbiomes of bumble bees could lead to species-specific responses to environmental change. For example, less stable microbiomes in bumble bees inhabiting higher elevations might indicate an increased sensitivity to pathogens. Short-term microbiome changes following translocation indicate that species with relatively stable microbiomes, such as B. lucorum and B. terrestris, can rapidly integrate new bacteria, which could increase their capacity to cope with new environments under climate change.

Abstract Image

探索大黄蜂与气候相关的肠道微生物组变异:实验和观察视角
气温上升直接通过生理影响和间接破坏蜜蜂与其他生物之间的相互作用对大黄蜂的适应性产生负面影响,这对于确定物种对气候变化的特异性反应至关重要。肠道微生物共生体是宿主营养和健康的关键调节因子,可能是昆虫热反应的致命弱点。它们不仅调节生物与植物和病原体的相互作用,而且本身也表现出不同的热敏性。了解环境变化如何破坏微生物群落是确定宿主种群反应的潜在后果的关键第一步。利用16S核糖体DNA扩增子测序技术,分析了德国阿尔卑斯山海拔梯度不同气候生态位的6种大黄蜂肠道细菌群落。我们首先研究了肠道细菌群落的种间和种内差异是否与物种的海拔生态位有关,这些生态位在温度、花资源组成和可能的病原体压力方面存在差异。在不同气候区域之间进行了一项互惠易位实验,测试了地绵猴和绿绵猴的肠道细菌群落在暴露于新环境时如何发生短期变化。最后,我们将这些物种暴露在气候室内的热和寒潮情景中,以将纯温度驱动对微生物组的影响与其他环境影响分开。微生物组组成的种间变异超过种内变异。物种表现出不同程度的肠道微生物稳定性,其中稳定性被定义为组内方差:在居住在高海拔地区的物种中,主要观察到较大的组内方差所表明的较低的稳定性。移植物种表现出微妙的短期肠道微生物组调整,其特征是暴露于温暖地区后乳酸杆菌科增加;然而,这些大黄蜂的肠道微生物组在实验室温度下没有变化。我们得出结论,大黄蜂肠道微生物组的显着差异可能导致物种对环境变化的特异性反应。例如,居住在高海拔地区的大黄蜂体内的微生物群落不太稳定,可能表明它们对病原体的敏感性增加。易位后短期内微生物组的变化表明,具有相对稳定微生物组的物种,如lucorum和b.s terrestris,可以快速整合新的细菌,从而提高其应对气候变化下新环境的能力。
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来源期刊
Ecology
Ecology 环境科学-生态学
CiteScore
8.30
自引率
2.10%
发文量
332
审稿时长
3 months
期刊介绍: Ecology publishes articles that report on the basic elements of ecological research. Emphasis is placed on concise, clear articles documenting important ecological phenomena. The journal publishes a broad array of research that includes a rapidly expanding envelope of subject matter, techniques, approaches, and concepts: paleoecology through present-day phenomena; evolutionary, population, physiological, community, and ecosystem ecology, as well as biogeochemistry; inclusive of descriptive, comparative, experimental, mathematical, statistical, and interdisciplinary approaches.
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