Neotropical wood‐eating catfishes (family Loricariidae) can occur in diverse assemblages with multiple genera and species feeding on the same woody detritus. As such, they present an intriguing system in which to examine the influence of host species identity on the vertebrate gut microbiome as well as to determine the potential role of gut bacteria in wood digestion. We characterized the gut microbiome of two co‐occurring catfish genera and four species: Panaqolus albomaculatus , Panaqolus gnomus , Panaqolus nocturnus, and Panaque bathyphilus , as well as that of submerged wood on which they feed. The gut bacterial community did not significantly vary across three gut regions (proximal, mid, distal) for any catfish species, although interspecific variation in the gut microbiome was significant, with magnitude of interspecific difference generally reflecting host phylogenetic proximity. Further, the gut microbiome of each species was significantly different to that present on the submerged wood. Inferring the genomic potential of the gut microbiome revealed that the majority of wood digesting pathways were at best equivalent to and more often depleted or nonexistent within the catfish gut compared to the submerged wood, suggesting a minimal role for the gut microbiome in wood digestion. Rather, these fishes are more likely reliant on fiber degradation performed by microbes in the environment, with their gut microbiome determined more by host identity and phylogenetic history.

中文翻译：

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同胞亚马孙食木cat鱼的肠道菌群反映了寄主的身份，在木材消化中的作用很小。

新热带食木cat鱼（科Loricariidae）可以以不同的组合出现，以同一木本碎屑为食的多个属和种。因此，他们提出了一个有趣的系统，可以检查宿主物种身份对脊椎动物肠道微生物组的影响，并确定肠道细菌在木材消化中的潜在作用。我们表征了两个同时存在的cat鱼属和四个物种的肠道微生物组：Panaqolus albomaculatus，Panaqolus gnomus，Panaqolus nocturnus和Panaque bathyphilus以及它们赖以生存的水下木材。尽管cat鱼微生物组的种间差异很显着，但种间差异的大小通常反映了宿主的系统发育亲缘关系，但cat鱼的三个肠道区域（近端，中部，远端）的肠道细菌群落没有显着变化。此外，每个物种的肠道微生物组与淹没木材上存在的微生物组明显不同。推断肠道微生物组的基因组潜力表明，与淹没的木材相比，大多数木材消化途径充其量等于the鱼肠道内，并且更经常被消耗或不存在，这表明肠道微生物组在木材消化中的作用很小。而是