Horizon / Plein textes La base de ressources documentaires de l'IRD



Publications des scientifiques de l'IRD

Biscere T., Ferrier-Pages C., Grover R., Gilbert A., Rottier C., Wright A., Payri Claude, Houlbrèque Fanny. (2018). Enhancement of coral calcification via the interplay of nickel and urease. Aquatic Toxicology, 200, 247-256. ISSN 0166-445X

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1016/j.aquatox.2018.05.013

Enhancement of coral calcification via the interplay of nickel and urease
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000438180700026
AuteursBiscere T., Ferrier-Pages C., Grover R., Gilbert A., Rottier C., Wright A., Payri Claude, Houlbrèque Fanny.
SourceAquatic Toxicology, 2018, 200, p. 247-256. ISSN 0166-445X
RésuméCorals are the main reef builders through the formation of calcium carbonate skeletons. In recent decades, coral calcification has however been impacted by many global (climate change) and local stressors (such as destructive fishing practices and changes in water quality). In this particular context, it is crucial to identify and characterize the various factors that promote coral calcification. We thus performed the first investigation of the effect of nickel and urea enrichment on the calcification rates of three coral species. These two factors may indeed interact with calcification through the activity of urease, which catalyzes the hydrolysis of urea to produce inorganic carbon and ammonia that are involved in the calcification process. Experiments were performed with the asymbiotic coral Dendrophyllia arbuscula and, to further assess if urea and/or nickel has an indirect link with calcification through photosynthesis, results were compared with those obtained with two symbiotic corals, Acropora muricata and Pocillopora damicornis, for which we also measured photosynthetic rates. Ambient and enriched nickel (0.12 and 3.50 mu g L-1 ) combined with ambient and enriched urea concentrations (0.26 and 5.52 mu mol L-1) were tested during 4 weeks in aquaria. We demonstrate in the study that a nickel enrichment alone or combined with a urea enrichment strongly stimulated urea uptake rates of the three tested species. In addition, this enhancement of urea uptake and hydrolysis significantly increased the long-term calcification rates (i.e. growth) of the three coral species investigated, inducing a 1.49-fold to 1.64-fold increase, respectively for D. arbuscula and P. damicornis. Since calcification was greatly enhanced by nickel in the asymbiotic coral species - i.e. in absence of photosynthesis - we concluded that the effect of increased urease activity on calcification was mainly direct. According to our results, it can be assumed that corals in some fringing reefs, benefiting from seawater enriched in nickel may have advantages and might be able to use urea more effectively as a carbon and nitrogen source. It can also be suggested that urea, for which hotspots are regularly measured in reef waters may alleviate the negative consequences of thermal stress on corals.
Plan de classementLimnologie biologique / Océanographie biologique [034] ; Pollution [038]
LocalisationFonds IRD [F B010073650]
Identifiant IRDfdi:010073650
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010073650

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL

Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation


Montpellier (centre IRD)

Montpellier (MSE)









La Paz