@article{fdi:010072329,
  title = {{C}haracterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure ({N}ew {C}aledonia, {S}outhwest {P}acific)},
  author = {{M}artias, {C}. and {T}edetti, {M}arc and {L}antoine, {F}. and {J}amet, {L}{\'e}ocadie and {D}upouy, {C}{\'e}cile},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he eastern lagoon of {N}ew {C}aledonia ({NC}, {S}outhwest {P}acific), listed as a {UNESCO} {W}orld {H}eritage site, hosts the world's second longest double-barrier coral reef. {T}his lagoon receives river inputs, oceanic water arrivals, and erosion pressure from ultramafic rocks, enriched in nickel ({N}i) and cobalt ({C}o). {T}he aim of this study was to characterize colored dissolved organic matter ({CDOM}), as well as to determine its main sources and its possible relationships (through the use of {P}earson correlation coefficients, r) with biogeochemical parameters, plankton communities and trace metals in the {NC} eastern lagoon. {W}ater samples were collected in {M}arch 2016 along a series of river/lagoon/open-ocean transects. {T}he absorption coefficient at 350 nm (a(350)) revealed the influence of river inputs on the {CDOM} distribution. {T}he high values of spectral slope ({S}275-295, >0.03 m(-1)) and the low values of specific ultraviolet absorbance ({SUVA}(254), <4 {L} mg-{C}-1 m(-1)) highlighted the photodegradation of {CDOM} in surface waters. {T}he application of parallel factor analysis ({PARAFAC}) on excitation-emission matrices ({EEM}s) allowed the identification of four {CDOM} components: (1) one humic-and one tyrosine-like fluorophores. {T}hey had terrestrial origin, exported through rivers and undergoing photo-and bio-degradation in the lagoon. {T}hese two fluorophores were linked to manganese ({M}n) in southern rivers (r = 0.46-0.50, n = 21, p < 0.05). (2) {A} tryptophan-like fluorophore, which exhibited higher levels offshore. {I}t would be potentially released from the coral reef. (3) {A} second tyrosine-like ("tyrosine 2-like") fluorophore. {L}inked to {P}rochlorococcus cyanobacteria (r = 0.39, n = 47, p < 0.05), this fluorophore would have an oceanic origin and enter in the lagoon through its southern and northern extremities. {I}t also displayed relationships with {N}i and {C}o content (r = 0.53-0.54, n = 21, p < 0.05). {T}his work underlines the diversity of {CDOM} sources in the {NC} eastern lagoon.},
  keywords = {{CDOM} ; {F}luorescence ; {T}race metals ; {S}outhwest {P}acific ; {C}oral reef lagoon ; {R}ivers ; {NOUVELLE} {CALEDONIE} ; {PACIFIQUE} {SUD} {OUEST}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {616},
  numero = {},
  pages = {438--452},
  ISSN = {0048-9697},
  year = {2018},
  DOI = {10.1016/j.scitotenv.2017.10.261},
  URL = {https://www.documentation.ird.fr/hor/fdi:010072329},
}