Linking isotopic signatures of nitrogen in nearshore coral skeletons with sources in catchment runoff

Guy S. Marion, Stacy D. Jupiter*, Veronica Z. Radice, Simon Albert, Ove Hoegh-Guldberg

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    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.

    Original languageEnglish
    Article number113054
    JournalMarine Pollution Bulletin
    Volume173
    DOIs
    Publication statusPublished - Dec 2021

    Fingerprint

    Dive into the research topics of 'Linking isotopic signatures of nitrogen in nearshore coral skeletons with sources in catchment runoff'. Together they form a unique fingerprint.

    Cite this