Diuron tolerance and potential degradation by pelagic microbiomes in the Great Barrier Reef lagoon

Angly, Florent E., Pantos, Olga, Morgan, Thomas C., Rich, Virginia, Tonin, Hemerson, Bourne, David G., Mercurio, Philip, Negri, Andrew P. and Tyson, Gene W. (2016) Diuron tolerance and potential degradation by pelagic microbiomes in the Great Barrier Reef lagoon. PeerJ, 4 . doi:10.7717/peerj.1758


Author Angly, Florent E.
Pantos, Olga
Morgan, Thomas C.
Rich, Virginia
Tonin, Hemerson
Bourne, David G.
Mercurio, Philip
Negri, Andrew P.
Tyson, Gene W.
Title Diuron tolerance and potential degradation by pelagic microbiomes in the Great Barrier Reef lagoon
Journal name PeerJ   Check publisher's open access policy
ISSN 2167-8359
Publication date 2016-03-08
Year available 2016
Sub-type Article (original research)
DOI 10.7717/peerj.1758
Open Access Status DOI
Volume 4
Total pages 23
Place of publication London, United Kingdom
Publisher PeerJ
Collection year 2017
Language eng
Abstract Diuron is a herbicide commonly used in agricultural areas where excess application causes it to leach into rivers, reach sensitive marine environments like the Great Barrier Reef (GBR) lagoon and pose risks to marine life. To investigate the impact of diuron on whole prokaryotic communities that underpin the marine food web and are integral to coral reef health, GBR lagoon water was incubated with diuron at environmentally-relevant concentration (8 μg/L), and sequenced at specific time points over the following year. 16S rRNA gene amplicon profiling revealed no significant short- or long-term effect of diuron on microbiome structure. The relative abundance of prokaryotic phototrophs was not significantly altered by diuron, which suggests that they were largely tolerant at this concentration. Assembly of a metagenome derived from waters sampled at a similar location in the GBR lagoon did not reveal the presence of mutations in the cyanobacterial photosystem that could explain diuron tolerance. However, resident phages displayed several variants of this gene and could potentially play a role in tolerance acquisition. Slow biodegradation of diuron was reported in the incubation flasks, but no correlation with the relative abundance of heterotrophs was evident. Analysis of metagenomic reads supports the hypothesis that previously uncharacterized hydrolases carried by low-abundance species may mediate herbicide degradation in the GBR lagoon. Overall, this study offers evidence that pelagic phototrophs of the GBR lagoon may be more tolerant of diuron than other tropical organisms, and that heterotrophs in the microbial seed bank may have the potential to degrade diuron and alleviate local anthropogenic stresses to inshore GBR ecosystems.
Keyword Diuron
Great barrier reef
Amplicon profiling
Metagenomics
Herbicide
Incubation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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