Ecological drift and local exposures drive enteric bacterial community differences within species of Galápagos iguanas.

Abstract:

:Diet strongly influences the intestinal microbial communities through species sorting. Alternatively, these communicates may differ because of chance variation in local microbial exposures or species losses among allopatric host populations (i.e. ecological drift). We investigated how these forces shape enteric communities of Galápagos marine and land iguanas. Geographically proximate populations shared more similar communities within a host ecotype, suggesting a role for ecological drift during host colonization of the islands. Additionally, evidence of taxa sharing between proximate heterospecific host populations suggests that contemporary local exposures also influence the gut community assembly. While selective forces such as host-bacterial interactions or dietary differences are dominant drivers of intestinal community differences among hosts, historical and contemporary processes of ecological drift may lead to differences in bacterial composition within a host species. Whether such differences in community structure translate into geographic variation in benefits derived from these intimate microbial communities remains to be explored.

journal_name

Mol Ecol

journal_title

Molecular ecology

authors

Lankau EW,Hong PY,Mackie RI

doi

10.1111/j.1365-294X.2012.05502.x

subject

Has Abstract

pub_date

2012-04-01 00:00:00

pages

1779-88

issue

7

eissn

0962-1083

issn

1365-294X

journal_volume

21

pub_type

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