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2018 ; 6
(1
): 84
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Multilevel social structure and diet shape the gut microbiota of the gelada
monkey, the only grazing primate
#MMPMID29729671
Trosvik P
; de Muinck EJ
; Rueness EK
; Fashing PJ
; Beierschmitt EC
; Callingham KR
; Kraus JB
; Trew TH
; Moges A
; Mekonnen A
; Venkataraman VV
; Nguyen N
Microbiome
2018[May]; 6
(1
): 84
PMID29729671
show ga
BACKGROUND: The gelada monkey (Theropithecus gelada), endemic to the Ethiopian
highlands, is the only graminivorous primate, i.e., it feeds mainly on grasses
and sedges. In spite of known dental, manual, and locomotor adaptations, the
intestinal anatomy of geladas is similar to that of other primates. We currently
lack a clear understanding of the adaptations in digestive physiology necessary
for this species to subsist on a graminoid-based diet, but digestion in other
graminivores, such as ruminants, relies heavily on the microbial community
residing in the gastrointestinal (GI) system. Furthermore, geladas form complex,
multilevel societies, making them a suitable system for investigating links
between sociality and the GI microbiota. RESULTS: Here, we explore the
gastrointestinal microbiota of gelada monkeys inhabiting an intact ecosystem and
document how factors like multilevel social structure and seasonal changes in
diet shape the GI microbiota. We compare the gelada GI microbiota to those of
other primate species, reporting a gradient from geladas to herbivorous
specialist monkeys to dietary generalist monkeys and lastly humans, the ultimate
ecological generalists. We also compare the microbiotas of the gelada GI tract
and the sheep rumen, finding that geladas are highly enriched for cellulolytic
bacteria associated with ruminant digestion, relative to other primates.
CONCLUSIONS: This study represents the first analysis of the gelada GI
microbiota, providing insights into the adaptations underlying graminivory in a
primate. Our results also highlight the role of social organization in
structuring the GI microbiota within a society of wild animals.