Title
Linking isotopic signatures of nitrogen in nearshore coral skeletons with sources in catchment runoff
Author(s)
Marion, Guy S.; Jupiter, Stacy D.; Radice, Veronica Z.; Albert, Simon; Hoegh-Guldberg, Ove
Published
2021
Publisher
Marine Pollution Bulletin
Abstract
We use a multi-tracer approach to identify catchment sources of nitrogen (N) in the skeletons of nearshore Porites corals within the Great Barrier Reef. We measured δ15N, δ13C and C:N ratios of particulate organic matter (POM) sampled from the Pioneer River catchment and identified five distinct end-members: (1) marine planktonic and algal-dominated matter with higher δ15N values from the river mouth and coastal waters; (2) estuarine planktonic and algal matter with lower δ15N values associated with estuarine mixing; (3) lower river freshwater phytoplankton and algal-dominated matter in stratified reservoirs adjacent to catchment weirs, with the 15N-enriched source likely caused by microbial remineralization and denitrification; (4) upper river low δ15N terrigenous soil matter eroded from cane fields bordering waterways; and (5) terrestrial plant detrital matter in forest streams, representing a low δ15N fixed atmospheric nitrogen source. The δ15N values of adjacent, nearshore Porites coral skeletons is reflective of POM composition in coastal waters, with 15N-enriched values reflective of transformed N during flood pulses from the Pioneer River.
Keywords
Water quality; Nitrogen cycle; River runoff; Microbial remineralization; Denitrification; Pioneer River catchment
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PUB27185