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首页> 外文期刊>Marine biology >Characterizing the resident, fermentative microbial consortium in the hindgut of the temperate-zone herbivorous fish, Hermosilla azures (Teleostei: Kyphosidae)
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Characterizing the resident, fermentative microbial consortium in the hindgut of the temperate-zone herbivorous fish, Hermosilla azures (Teleostei: Kyphosidae)

机译：表征温带草食性鱼类Hermosilla azures（Teleostei：Kyphosidae）后肠中的常驻发酵微生物菌群

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摘要

The zebraperch, Hermosilla azurea Jenkins and Evermann, a warm-temperate marine fish species with a strictly macroalgal diet, has a relatively long digestive tract with an enlarged hindgut and an associated blind caecum (HC). In zebraperch sampled off Santa Catalina Island, California (33°19′42″N; 118°18′37″W) in years 1995 through 2001, direct cell counts, gut epithelium assessment of bacterial attachment, and short-chain fatty acid (SCFA) analyses verified that the zebraperch HC possesses a dense and morphologically diverse, fermentative microbiota. Bacterial cell counts and morphological diversity were significantly higher in HC contents compared to anterior gut regions, suggesting that microbial populations were growing along the digestive tract. Similarly, electron micrographs of the HC epithelium revealed attached microbes, further supporting the possibility that these organisms constitute resident microbiota. Five different SCFAs were detected in all three regions of the digestive tract, but levels were up to three times greater in HC contents. Acetate was consistently the prevailing SCFA in all gut regions. Sequence analysis of bacterial 16S rDNA was used to identify predominant bacterial groups in HC contents. Of the seven main bacterial types identified, Enterovibrio spp. were the dominant bacteria in HC contents followed by species of Bacteroides,Faecalibac-terium, and Desulfovibrio. Taken together, our findings show that the zebraperch HC harbors a consortium of microbes that appears to assist in the breakdown of algal polysaccharides in the herbivorous diet of the fish.
机译：斑马，Hermosilla azurea Jenkins和Evermann是一种温带海洋鱼类，严格按大型藻类饮食进行饲养，消化道相对较长，后肠增大，盲肠（HC）增多。在1995年至2001年从加利福尼亚圣卡塔琳娜岛（33°19′42″ N; 118°18′37″ W）采样的斑马中，直接细胞计数，肠道上皮细菌附着的评估以及短链脂肪酸（ SCFA）分析证明，斑马HC拥有密集且形态多样的发酵菌群。与前肠区域相比，HC含量中细菌细胞计数和形态多样性显着更高，表明微生物群体沿消化道增长。同样，HC上皮的电子显微照片显示出附着的微生物，进一步支持了这些生物体构成驻留微生物群的可能性。在消化道的所有三个区域中检测到五种不同的SCFA，但HC含量的水平却高出三倍。醋酸盐一直是所有肠道地区流行的SCFA。细菌16S rDNA的序列分析用于鉴定HC含量中的主要细菌组。在确定的七种主要细菌类型中，Enterovibrio spp。 HC含量最高的细菌是细菌，其次是拟杆菌，费卡细菌和脱硫弧菌。综上所述，我们的发现表明，斑马HC含有一个微生物群落，似乎有助于分解鱼的草食中的藻类多糖。

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