The negative diversity‐invasion relationship observed in microbial invasion studies is commonly explained by competition between the invader and resident populations. However, whether this relationship is affected by invader‐resident cooperative interactions is unknown. Using ecological and mathematical approaches, we examined the survival and functionality of Aminobacter niigataensis MSH1 to mineralize 2,6‐dichlorobenzamide (BAM), a groundwater micropollutant affecting drinking water production, in sand microcosms when inoculated together with synthetic assemblies of resident bacteria. The assemblies varied in richness and in strains that interacted pairwise with MSH1, including cooperative and competitive interactions. While overall, the negative diversity‐invasion relationship was retained, residents engaging in cooperative interactions with the invader had a positive impact on MSH1 survival and functionality, highlighting the dependency of invasion success on community composition. No correlation existed between community richness and the delay in BAM mineralization by MSH1. The findings suggest that the presence of cooperative residents can alleviate the negative diversity‐invasion relationship.

中文翻译：

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入侵者和常驻微生物群落成员之间的合作相互作用削弱了负多样性入侵关系

微生物入侵研究中观察到的负多样性-入侵关系通常可以用入侵者和常住种群之间的竞争来解释。然而，这种关系是否受到入侵者与居民合作互动的影响尚不清楚。使用生态和数学方法，我们检查了生物的生存和功能新泻氨基杆菌当与常驻细菌的合成组件一起接种时，MSH1 可在沙子微观世界中矿化 2,6-二氯苯甲酰胺 (BAM)，这是一种影响饮用水生产的地下水微污染物。这些组装体的丰富度和与 MSH1 成对相互作用的菌株各不相同，包括合作和竞争相互作用。虽然总体而言，负多样性-入侵关系得以保留，但居民与入侵者进行合作互动对 MSH1 的生存和功能产生积极影响，凸显了入侵成功对群落组成的依赖性。群落丰富度与 MSH1 延迟 BAM 矿化之间不存在相关性。研究结果表明，合作居民的存在可以缓解负多样性入侵关系。