Publications des scientifiques de l'IRD

Jacquemont J., Houlbrèque Fanny, Tanvet C., Rodolfo-Metalpa Riccardo. (2022). Long-term exposure to an extreme environment induces species-specific responses in corals' photosynthesis and respiration rates. Marine Biology, 169 (6), p. 82 [15 p.]. ISSN 0025-3162.

Titre du document
Long-term exposure to an extreme environment induces species-specific responses in corals' photosynthesis and respiration rates
Année de publication
2022
Type de document
Article référencé dans le Web of Science WOS:000800797800001
Auteurs
Jacquemont J., Houlbrèque Fanny, Tanvet C., Rodolfo-Metalpa Riccardo
Source
Marine Biology, 2022, 169 (6), p. 82 [15 p.] ISSN 0025-3162
Extreme reef environments have become useful natural laboratories to investigate physiological specificities of species chronically exposed to future-like climatic conditions. The lagoon of Bourake in New Caledonia (21 degrees 56 ' 56.16 ' S; 125 degrees 59 ' 36.82 ' E) is one of the only reef environments studied where the three main climatic stressors predicted to most severely impact corals occur. In this lagoon, temperatures, seawater pH(T) and dissolved oxygen chronically fluctuate between extreme and close-to-normal values (17.5-33.85 degrees C, 7.23-7.92 pH(T) units and 1.87-7.24 mg O-2 L-1, respectively). In March 2020, the endosymbiont functions (chl a, cell density and photosynthesis) and respiration rates were investigated in seven coral species from this lagoon and compared with those of corals from an adjacent reference site using hour-long incubations mimicking present-day and future conditions. Corals originating from Bourake displayed significant differences in these variables compared to reference corals, but these differences were species-specific. Photosynthetic rates of Bourake corals were all significantly lower than those of reference corals but were partially compensated by higher chlorophyll contents. Respiration rates of the Bourake corals were either lower or comparable to those of reference corals. Conversely, photosynthesis and respiration rates of most studied species were similar regardless of the incubation conditions, which mimicked either present-day or future conditions. This study supports previous work indicating that no unique response can explain corals' tolerance to sub-optimal conditions and that a variety of mechanisms will be at play for corals in a changing world.
Plan de classement
Sciences du milieu [021] ; Limnologie biologique / Océanographie biologique [034]
Description Géographique
NOUVELLE CALEDONIE ; PACIFIQUE ; BOURAKE LAGON
Localisation
Fonds IRD [F B010085180]
Identifiant IRD
fdi:010085180
Contact
  • Coordonnées :
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    32 avenue Henri Varagnat
    93140 Bondy Cedex
    France
    Horizon Pleins textes
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