Budd Kris, Gunn Joe C, Finch Tabitha, Klymus Katy, Sitati Noah, Eggert Lori S
Division of Biological Sciences University of Missouri Columbia MO USA.
Vermont Genetics Network University of Vermont Burlington VT USA.
Ecol Evol. 2020 May 18;10(12):5637-5650. doi: 10.1002/ece3.6305. eCollection 2020 Jun.
The gut microbiome, or the community of microorganisms inhabiting the digestive tract, is often unique to its symbiont and, in many animal taxa, is highly influenced by host phylogeny and diet. In this study, we characterized the gut microbiome of the African savanna elephant () and the African forest elephant (), sister taxa separated by 2.6-5.6 million years of independent evolution. We examined the effect of host phylogeny on microbiome composition. Additionally, we examined the influence of habitat types (forest versus savanna) and diet types (crop-raiding versus noncrop-raiding) on the microbiome within . We found 58 bacterial orders, representing 16 phyla, across all African elephant samples. The most common phyla were Firmicutes, Proteobacteria, and Bacteroidetes. The microbiome of was dominated by Firmicutes, similar to other hindgut fermenters, while the microbiome of was dominated by Proteobacteria, similar to more frugivorous species. Alpha diversity did not differ across species, habitat type, or diet, but beta diversity indicated that microbial communities differed significantly among species, diet types, and habitat types. Based on predicted KEGG metabolic pathways, we also found significant differences between species, but not habitat or diet, in amino acid metabolism, energy metabolism, and metabolism of terpenoids and polyketides. Understanding the digestive capabilities of these elephant species could aid in their captive management and ultimately their conservation.
肠道微生物群,即栖息在消化道中的微生物群落,通常与其共生体独特,并且在许多动物类群中,受到宿主系统发育和饮食的高度影响。在本研究中,我们对非洲草原象()和非洲森林象()的肠道微生物群进行了特征描述,这两个姐妹类群经过260万至560万年的独立进化而分离。我们研究了宿主系统发育对微生物群组成的影响。此外,我们还研究了栖息地类型(森林与草原)和饮食类型(盗食作物与非盗食作物)对非洲象体内微生物群的影响。我们在所有非洲象样本中发现了代表16个门的58个细菌目。最常见的门是厚壁菌门、变形菌门和拟杆菌门。草原象的微生物群以厚壁菌门为主,类似于其他后肠发酵动物,而森林象的微生物群以变形菌门为主,类似于更多的食果物种。物种、栖息地类型或饮食之间的α多样性没有差异,但β多样性表明微生物群落在物种、饮食类型和栖息地类型之间存在显著差异。基于预测的KEGG代谢途径,我们还发现物种之间在氨基酸代谢、能量代谢以及萜类和聚酮类代谢方面存在显著差异,但栖息地或饮食之间没有差异。了解这些象种的消化能力有助于它们的圈养管理,并最终有助于它们的保护。
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