@article{fdi:010088880,
  title = {{T}racing the fate of seabird-derived nitrogen in a coral reef using nitrate and coral skeleton nitrogen isotopes},
  author = {{C}hoisnard, {N}. and {D}uprey, {N}. {N}. and {W}ald, {T}. and {T}hibault, {M}artin and {H}oulbr{\`e}que, {F}anny and {F}oreman, {A}. {D}. and {C}uet, {P}. and {G}uillaume, {M}. {M}. {M}. and {V}onhof, {H}. and {S}igman, {D}. {M}. and {H}aug, {G}. {H}. and {M}aguer, {J}. {F}. and {L}'{H}elguen, {S}. and {M}artínez-{G}arcía, {A}. and {L}orrain, {A}nne},
  editor = {},
  language = {{ENG}},
  abstract = {{S}eabirds transfer nutrients from the ocean to their nesting island, potentially altering nitrogen ({N}) cycling within adjacent terrestrial and marine ecosystems. {Y}et, the processes involved in seabird-{N} transfer along the land-sea continuum remain elusive. {U}sing delta 15{N} and delta 18{O} measurements of groundwater nitrate, we demonstrate the role of brackish groundwater located within a coral island's landmass as a major reservoir of nitrate (at millimolar levels). {N}early all of the total dissolved seabird-derived {N} leaching into the groundwater (mostly ammonium and uric acid) is converted to nitrate by nitrification, as supported by the relatively low delta 18{O} of the groundwater nitrate (3.97 parts per thousand +/- 0.30 parts per thousand). {C}omparison of nitrate delta 15{N} and delta 18{O} suggests that little denitrification takes place within the groundwater lens, implying that the high delta 15{N} of groundwater nitrate (13.73 parts per thousand +/- 0.05 parts per thousand) derives from the high trophic position of seabirds and postdepositional processes that increase the delta 15{N} of seabird excreta. {S}eawater and coral skeleton samples from a reef flat exposed to groundwater had higher delta 15{N} values than at sites devoid of groundwater influence, indicating that the main source of {N} at the latter site was the {S}ubtropical {U}pper {W}ater, while the groundwater nitrate dominated the exposed reef flat {N} pool up to 200 m from shore. {I}n addition, these results indicate that coral-bound delta 15{N} can detect seabird-derived nitrate delta 15{N}, raising opportunities to reconstruct historical seabird-{N} inputs to coral reefs in relation to climatic and other changes, such as the introduction of invasive species.},
  keywords = {{NOUVELLE} {CALEDONIE} ; {PACIFIQUE} {ILES} ; {OCEAN} {INDIEN} {ILES} ; {SURPRISE} {ILE} ; {ENTRECASTEAUX} {RECIF} ; {GRANDE} {GLORIEUSE} {ILE} ; {TROMELIN} {ILE}},
  booktitle = {},
  journal = {{L}imnology and {O}ceanography},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[16 ]},
  ISSN = {0024-3590},
  year = {2024},
  DOI = {10.1002/lno.12485},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088880},
}