Fine-scale spatial variation shape fecal microbiome diversity and composition in black- tailed prairie dogs (Cynomys ludovicianus)

Abstract

BackgroundHost associated gut microbiota are important in understanding the coevolution of host-microbe, it’s causes and consequences that may help wildlife population to adapt to its rapid climatic changes. Mammalian gut microbiota composition and diversity may be affected by a variety of factors including geographic variation, seasonal variation in diet, habitat disturbance, environmental conditions, age, and sex. However, there have been few studies that have examined how ecological and environmental factors influence gut microbiota composition in animals' natural environments. In this study, we explore how host habitat, geographical location and environmental factors affect the fecal microbiota of Cynomys ludovicianus at a small spatial scale. We collected fecal samples from five geographically distinct locations in Texas Panhandle occupying habitat classified as urban and rural areas using high throughput 16S rRNA gene amplicon sequencing. ResultsThe results showed that microbiota of fecal samples was largely dominated by phylum Bacteroidetes. Fecal microbiome diversity and composition differed significantly across sampling sites and habitats. Prairie dogs inhabiting urban areas showed reduced fecal diversity due to more homogenous environment and anthropogenic disturbance. Urban prairie dog colonies displayed greater phylogenetic variation than those in rural habitats. Differentially abundant analysis revealed that bacterial species pathogenic to humans and animals were highly abundant in urban areas which indicates that host health and fitness might be negatively affected. Random forest model identified Alistipes shahii as the important species driving the changes in fecal microbiome composition. Despite the effects of habitat and geographic location of host, we found a strong correlation with environmental factors- average maximum temperature was the best predictor of prairie dog fecal microbial diversity. ConclusionsOur findings suggest that reduction in alpha diversity in conjunction with greater dispersion in beta diversity could be indicative of declining host health in urban areas which could help determine in future conservation efforts. Moreover, several bacterial species pathogenic to humans and other animals were highly abundant in prairie dog colonies near urban areas, which may in turn adversely affect host phenotype and fitness.