Abstract:
:While the ecosystem of the Great Barrier Reef (GBR), north-eastern Australia, is being threatened by the elevated levels of sediments and nutrients discharged from adjacent coastal river systems, the source of these detrimental pollutants are not well understood. Here we used a combined isotopic (δ13C, δ15N) and geochemical (Zn, Pt and S) signatures and stable isotope analysis in R (SIAR) mixing model to estimate the contribution of different land uses to the sediment and associated particulate nitrogen delivered to the Johnstone River. Results showed that rainforest was the largest contributor of suspended and bed sediments in the river estuary (both 33.1%), followed by banana (26.7%, 20.4%), sugarcane (21.5%, 21.4%) and grazing (18.7%, 25.1%). However, bananas and sugarcane land uses had the highest contribution to sediments delivered to the coast per unit of area. This will help land managers to prioritise on-ground activities to improve water quality in the GBR lagoon.
journal_name
Mar Pollut Bulljournal_title
Marine pollution bulletinauthors
Bahadori M,Chen C,Lewis S,Rashti MR,Cook F,Parnell A,Esfandbod M,Stevens Tdoi
10.1016/j.marpolbul.2020.111344subject
Has Abstractpub_date
2020-08-01 00:00:00pages
111344eissn
0025-326Xissn
1879-3363pii
S0025-326X(20)30462-8journal_volume
157pub_type
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