The origin of suspended particulate matter in the Great Barrier Reef

Mohammad Bahadori, Chengrong Chen (), Stephen Lewis, Juntao Wang, Jupei Shen, Enqing Hou, Mehran Rezaei Rashti, Qiaoyun Huang, Zoe Bainbridge and Tom Stevens
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Mohammad Bahadori: Griffith University
Chengrong Chen: Griffith University
Stephen Lewis: James Cook University
Juntao Wang: Western Sydney University
Jupei Shen: Fujian Normal University
Enqing Hou: Chinese Academy of Sciences
Mehran Rezaei Rashti: Griffith University
Qiaoyun Huang: Huazhong Agricultural University
Zoe Bainbridge: James Cook University
Tom Stevens: James Cook University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract River run-off has long been regarded as the largest source of organic-rich suspended particulate matter (SPM) in the Great Barrier Reef (GBR), contributing to high turbidity, pollutant exposure and increasing vulnerability of coral reef to climate change. However, the terrestrial versus marine origin of the SPM in the GBR is uncertain. Here we provide multiple lines of evidence (13C NMR, isotopic and genetic fingerprints) to unravel that a considerable proportion of the terrestrially-derived SPM is degraded in the riverine and estuarine mixing zones before it is transported further offshore. The fingerprints of SPM in the marine environment were completely different from those of terrestrial origin but more consistent with that formed by marine phytoplankton. This result indicates that the SPM in the GBR may not have terrestrial origin but produced locally in the marine environment, which has significant implications on developing better-targeted management practices for improving water quality in the GBR.

Date: 2023
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DOI: 10.1038/s41467-023-41183-z

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