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Title: The role of macrobiota in structuring microbial communities along rocky shores

Rocky shore microbial diversity presents an excellent system to test for microbial habitat specificity or generality, enabling us to decipher how common macrobiota shape microbial community structure. At two coastal locations in the northeast Pacific Ocean, we show that microbial composition was significantly different between inert surfaces, the biogenic surfaces that included rocky shore animals and an alga, and the water column plankton. While all sampled entities had a core of common OTUs, rare OTUs drove differences among biotic and abiotic substrates. For the mussel Mytilus californianus, the shell surface harbored greater alpha diversity compared to internal tissues of the gill and siphon. Strikingly, a 7-year experimental removal of this mussel from tidepools did not significantly alter the microbial community structure of microbes associated with inert surfaces when compared with unmanipulated tidepools. However, bacterial taxa associated with nitrate reduction had greater relative abundance with mussels present, suggesting an impact of increased animal-derived nitrogen on a subset of microbial metabolism. Because the presence of mussels did not affect the structure and diversity of the microbial community on adjacent inert substrates, microbes in this rocky shore environment may be predominantly affected through direct physical association with macrobiota.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Ecology and Evolution, University of Chicago, Chicago, IL (United States)
  2. Department of Ecology and Evolution, University of Chicago, Chicago, IL (United States); Institute of Genomic and Systems Biology, Argonne National Laboratory, Lemont, IL (United States)
  3. Institute of Genomic and Systems Biology, Argonne National Laboratory, Lemont, IL (United States); Biophysical Sciences Graduate Program, University of Chicago, Chicago, IL (United States)
Publication Date:
OSTI Identifier:
1223366
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
PeerJ
Additional Journal Information:
Journal Volume: 2; Journal ID: ISSN 2167-8359
Publisher:
PeerJ Inc.
Research Org:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES