Abstract # 13154 Event # 121:

Scheduled for Friday, August 10, 2018 10:45 AM-11:00 AM: (Chula Vista ) Oral Presentation


E. C. Wikberg1, D. Christie2, P. Sicotte3 and N. Ting2
1Department of Anthropology, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, USA, 2Department of Anthropology and Institute of Ecology and Evolution, University of Oregon, 3Department of Anthropology and Archaeology, University of Calgary
     The gut microbiome is structured by social groups in several host taxa, but it is unclear whether this pattern is due to similarity in diets, closer relatedness, or more frequent social interactions between group members than extra-group members. To determine the importance of these variables in structuring the gut microbiome by groups, we investigated whether diet, relatedness, or 1-meter proximity networks could explain gut microbiome beta diversity among 19 female Colobus vellerosus in 3 different groups at Boabeng-Fiema, Ghana. We combined demographic and behavioral data collected during one year with 16S rRNA sequencing of samples collected at the end of the observation period. Gut microbiome beta diversity increased with home range separation (N=342 dyads, Mantel test: r = 0.48, p = 0.003). Beta diversity between females in different groups (N=236 between-group dyads) increased with distance in the 1-m proximity network (GLMM, coefficient estimate: 0.020, 95% CI: 0.018 –0.022), but was not predicted by diet (GLMM, coefficient estimate: -0.001, 95% CI: -0.005 – 0.003) or relatedness (GLMM, coefficient estimate: -0.001, 95% CI: -0.003 – 0.001). This finding indicates that occasional close proximity with extra-group members is sufficient for initial gut microbiome transmission and may explain why the gut microbiome is structured by groups and home range separation.