Impacts of bioturbation on temporal variation in bacterial and archaeal nitrogen-cycling gene abundance in coastal sediments

Authors

  • B. Laverock,

    Corresponding author
    1. Plymouth Marine Laboratory, Plymouth, UK
    2. Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK
    3. School of Plant Biology and the UWA Oceans Institute, University of Western Australia, Crawley, WA, Australia
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  • K. Tait,

    1. Plymouth Marine Laboratory, Plymouth, UK
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  • J. A. Gilbert,

    1. Argonne National Laboratory, Institute of Genomic and Systems Biology, Argonne, IL, USA
    2. Department of Ecology and Evolution, University of Chicago, Chicago, IL, USA
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  • A. M. Osborn,

    1. Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK
    2. Department of Biological Sciences, University of Hull, Hull, UK
    Current affiliation:
    1. School of Life Sciences, University of Lincoln, Brayford Pool, Lincoln, UK
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  • S. Widdicombe

    1. Plymouth Marine Laboratory, Plymouth, UK
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Summary

In marine environments, macrofauna living in or on the sediment surface may alter the structure, diversity and function of benthic microbial communities. In particular, microbial nitrogen (N)-cycling processes may be enhanced by the activity of large bioturbating organisms. Here, we study the effect of the burrowing mud shrimp Upogebia deltaura upon temporal variation in the abundance of genes representing key N-cycling functional guilds. The abundance of bacterial genes representing different N-cycling guilds displayed different temporal patterns in burrow sediments in comparison with surface sediments, suggesting that the burrow provides a unique environment where bacterial gene abundances are influenced directly by macrofaunal activity. In contrast, the abundances of archaeal ammonia oxidizers varied temporally but were not affected by bioturbation, indicating differential responses between bacterial and archaeal ammonia oxidizers to environmental physicochemical controls. This study highlights the importance of bioturbation as a control over the temporal variation in nitrogen-cycling microbial community dynamics within coastal sediments.

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