Seasonal, spatial, and maternal effects on gut microbiome in wild red squirrels.

Abstract:

BACKGROUND:Our understanding of gut microbiota has been limited primarily to findings from human and laboratory animals, but what shapes the gut microbiota in nature remains largely unknown. To fill this gap, we conducted a comprehensive study of gut microbiota of a well-studied North American red squirrel (Tamiasciurus hudsonicus) population. Red squirrels are territorial, solitary, and live in a highly seasonal environment and therefore represent a very attractive system to study factors that drive the temporal and spatial dynamics of gut microbiota. RESULT:For the first time, this study revealed significant spatial patterns of gut microbiota within a host population, suggesting limited dispersal could play a role in shaping and maintaining the structure of gut microbial communities. We also found a remarkable seasonal rhythm in red squirrel's gut microbial composition manifested by a tradeoff between relative abundance of two genera Oscillospira and Corpococcus and clearly associated with seasonal variation in diet availability. Our results show that in nature, environmental factors exert a much stronger influence on gut microbiota than host-associated factors including age and sex. Despite strong environmental effects, we found clear evidence of individuality and maternal effects, but host genetics did not seem to be a significant driver of the gut microbial communities in red squirrels. CONCLUSION:Taken together, the results of this study emphasize the importance of external ecological factors rather than host attributes in driving temporal and spatial patterns of gut microbiota in natural environment.

journal_name

Microbiome

journal_title

Microbiome

authors

Ren T,Boutin S,Humphries MM,Dantzer B,Gorrell JC,Coltman DW,McAdam AG,Wu M

doi

10.1186/s40168-017-0382-3

subject

Has Abstract

pub_date

2017-12-21 00:00:00

pages

163

issue

1

issn

2049-2618

pii

10.1186/s40168-017-0382-3

journal_volume

5

pub_type

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