在病原体感染下的两生物植物共生中,确定性和随机性之间的模糊线条
Ana V Longo1, Jaiber J Solano-Iguaran2, Andrés Valenzuela-Sánchez3,4
1Department of Biology, University of Florida, Gainesville, Florida, USA.
Molecular ecology
|March 22, 2025
概括
大多数两动物皮肤细菌是由分散和偶然形成的,宿主物种和病原体Batrachochytrium dendrobatidis (Bd) 也会影响微生物群落. 这揭示了环境因素和宿主-病原体相互作用如何塑造跨度的ectotherm微生物群.
科学领域:
- 微生物生态学 微生物生态学
- 阳热生物学 阳热生物学
- 同生相互作用的交互.
背景情况:
- 微生物社区的组成是由选择,分散和漂移形成的.
- 了解这些跨宿主和微生物周转的过程,特别是沿着度梯度的理解是有限的.
- 两动物的皮肤微生物组容易受到由病原体Batrachochytrium dendrobatidis (Bd) 引起的失生症.
研究的目的:
- 为了研究塑造两动物皮肤细菌体的生态和进化过程的相互作用,跨越一个度梯度.
- 确定皮肤微生物组组合中中性 (分散,漂移) 与确定性 (植物共生,宿主特异性相互作用) 过程的相对重要性.
- 评估宿主系和Bd感染对皮肤细菌社区结构的影响.
主要方法:
- 在智利10度度范围内收集了来自22种两动物物种的580个个体的皮肤细菌组数据.
- 采用了比较方法,考虑了Bd感染状态,并使用了重新采样方案.
- 应用中性模型来评估在两个焦点物种中传播和细菌社区聚集的机会对细菌社区的贡献.
主要成果:
- 发现了植物共生的证据,与密切相关的两动物物种有更相似的细菌群落.
- 中性模型表明,在Pleurodema thaul和Rhinoderma darwinii中,分散和机会在很大程度上决定了90%的皮肤细菌.
- 主体物种解释了非中性细菌种群中21%-32%的变异;Bd感染的影响较弱,但显著.
结论:
- 大多数两动物皮肤细菌主要受到分散和随机事件的影响.
- 尽管中性过程占主导地位,但宿主物种和病原体相互作用在两生物微生物组上留下了重要的印记.
- 这些发现突出了构建ectotherm微生物组的因素在大型地理尺度上的复杂相互作用.
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