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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Habitat-specific gut microbiota of the marine herbivore Idotea balthica (Isopoda)
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Habitat-specific gut microbiota of the marine herbivore Idotea balthica (Isopoda)

机译：海洋食草动物Idotea balthica（Isopoda）的栖息地特定肠道菌群

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We hypothesised that the generalist herbivore Idotea balthica may harbour intestinal symbiotic bacteria that aid in food utilisation by the host and that the number and/or identities and thus the contribution of such symbionts may vary between the habitats. We investigated the gut microbiota and its contribution to host use ability of the I. balthica originating from two host assemblages, dominated by either the bladderwrack Fucus vesiculosus or the seagrass Zostera marina. In I. balthica, the host use abilities of populations were habitat-specific suggesting divergent evolution for digestion mechanism between different selective environments. We found bacteria both in the hindgut of I. balthica and in the digestive midgut glands, demonstrating for the first time the presence of bacterial midgut symbionts in a marine isopod. To study the effects of gut microbes on isopod performance, we reared iso-pods on two distinct diets, Fucus and Zostera, and manipulated their gut microbes with antibiotic treatment. The effect of antibiotic treatment on the bacterial counts depended on the isopod origin: antibiotics reduced bacterial counts in isopods originating from the Fucus assemblage, but had no effect on isopods originating from the Zostera assemblage, supporting the hypothesis that the bacterial communities in the gut differ between the habitats. On the Fucus diet, isopods with natural gut bacteria grew less well than those treated with antibiotics, whereas no such difference in growth was found on the much lower quality Zostera diet. Symbiotic bacteria, depending on the diet, may thus be harmful or indifferent to their isopod host.
机译：我们假设通才食草动物Idotea balthica可能带有肠道共生细菌，这些细菌有助于宿主利用食物，并且共生体的数量和/或身份及其贡献在生境之间可能会有所不同。我们调查了肠道微生物群及其对源自两个宿主组合（由膀胱沉着的褐藻Fucus vesiculosus或海草Zostera marina占主导地位）的巴氏衣原体的宿主利用能力的贡献。在Balthica中，种群的宿主利用能力是特定于栖息地的，这表明不同选择环境之间消化机制的进化不同。我们在鱼的后肠和中肠消化腺中都发现了细菌，这首次证明了海洋等足动物中细菌中肠共生体的存在。为了研究肠道微生物对等足动物性能的影响，我们在两种不同的饮食中添加了异荚鱼（Fusus和Zostera），并通过抗生素治疗了它们的肠道微生物。抗生素处理对细菌计数的影响取决于等足动物的来源：抗生素减少了来自悬钩子组合的等足动物的细菌计数，但对源自佐斯特拉组合的等足动物没有影响，支持了肠道中细菌群落不同的假设。在生境之间。在Fucus饮食中，带有天然肠细菌的等足动物的生长不如用抗生素治疗的足动物，但是在质量低得多的Zostera饮食中没有发现这种生长差异。因此，取决于饮食，共生细菌可能对其等足动物宿主有害或无视。

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