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Habitat filters mediate successional trajectories in bacterial communities associated with the striped shore crab.
Oecologia ( IF 2.7 ) Pub Date : 2019-11-07 , DOI: 10.1007/s00442-019-04549-z
Catalina Cuellar-Gempeler 1 , Pablo Munguia 2
Affiliation  

The relative importance of stochastic- and niche-based processes shifts during successional time and across different types of habitats. Microbial biofilms are known to undergo such successional shifts. However, little is known about the interaction between these successional trajectories and habitat filters. Harsh habitat filters could affect biofilm successional trajectories by strengthening niche-based processes and weakening stochastic processes. We used mesocosms to track successional trajectories in bacterial communities associated with the striped shore crab (Pachygrapsus transversus). We followed replicated microbial communities under strong and weak habitat filters associated with the crab's gut and carapace. For bacteria, colonization of the crab's gut is constrained by strong chemical and physical filtering, while the carapace remains relatively open for colonization. Consistent with successional models of bacterial biofilms, carapace microbial communities initially converged in community composition at day 8 and diverged thereafter. We expected gut microbial communities to deviate from the trajectory in the carapace and converge towards a subset of tolerant species. Instead, bacterial communities in the gut exhibited low richness, unchanging similarity in composition and turnover in species identities throughout the duration of our study. These habitat filter effects were linked with weak species interactions and low influence from colonization in the gut. If these findings are representative of differences in filter strength in a continuum of successional trajectories, habitat filters may provide basis for predictions that link successional models and habitat types.

中文翻译:

生境过滤器介导了与条纹海岸蟹相关的细菌群落中的演替轨迹。

随机过程和小生境过程的相对重要性在连续时间内以及在不同类型的生境中发生变化。已知微生物生物膜经历这样的连续转变。然而,关于这些连续轨迹与栖息地过滤器之间相互作用的信息知之甚少。苛刻的栖息地过滤器可能会通过加强基于利基的过程并削弱随机过程来影响生物膜的演替轨迹。我们使用mesocosms来跟踪与条纹海岸蟹(Pachygrapsus横断面)相关的细菌群落中的演替轨迹。我们在与蟹的肠和甲壳相关的强弱过滤器下追踪了复制的微生物群落。对于细菌而言,蟹肠的定居受到严格的化学和物理过滤的限制,而甲壳仍然相对开放以便定殖。与细菌生物膜的演替模型一致,甲壳微生物群落最初在第8天会聚在群落组成中,然后开始分化。我们期望肠道微生物群落偏离甲壳的轨迹,并趋向一部分耐受物种。取而代之的是,在整个研究过程中,肠道中的细菌群落显示出较低的丰富度,在组成和种类识别方面的组成和更新均保持不变。这些栖息地过滤器的影响与弱种相互作用和肠道定殖的低影响有关。如果这些发现代表了连续轨迹中过滤器强度的差异,
更新日期:2019-11-05
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