Publications des scientifiques de l'IRD

Meunier V., Geissler L., Bonnet Sophie, Radecker N., Perna G., Grosso O., Lambert C., Rodolfo-Metalpa Riccardo, Voolstra C. R., Houlbrèque Fanny. (2021). Microbes support enhanced nitrogen requirements of coral holobionts in a high CO2 environment. Molecular Ecology, 30 (22), 5888-5899. ISSN 0962-1083.

Titre du document
Microbes support enhanced nitrogen requirements of coral holobionts in a high CO2 environment
Année de publication
2021
Type de document
Article référencé dans le Web of Science WOS:000703334100001
Auteurs
Meunier V., Geissler L., Bonnet Sophie, Radecker N., Perna G., Grosso O., Lambert C., Rodolfo-Metalpa Riccardo, Voolstra C. R., Houlbrèque Fanny
Source
Molecular Ecology, 2021, 30 (22), 5888-5899 ISSN 0962-1083
Ocean acidification is posing a threat to calcifying organisms due to the increased energy requirements of calcification under high CO2 conditions. The ability of scleractinian corals to cope with future ocean conditions will thus depend on their ability to fulfil their carbon requirement. However, the primary productivity of coral holobionts is limited by low nitrogen (N) availability in coral reef waters. Here, we employed CO2 seeps of Tutum Bay (Papua New Guinea) as a natural laboratory to understand how coral holobionts offset their increased energy requirements under high CO2 conditions. Our results demonstrate for the first time that under high pCO(2) conditions, N assimilation pathways of Pocillopora damicornis are jointly modified. We found that diazotroph-derived N assimilation rates in the Symbiodiniaceae were significantly higher in comparison to an ambient CO2 control site, concomitant with a restructured diazotroph community and the specific prevalence of an alpha-proteobacterium. Further, corals at the high CO2 site also had increased feeding rates on picoplankton and in particular exhibited selective feeding on Synechococcus sp., known to be rich in N. Given the high abundance of picoplankton in oligotrophic waters at large, our results suggest that corals exhibiting flexible diazotrophic communities and capable of exploiting N-rich picoplankton sources to offset their increased N requirements may be able to cope better in a high pCO(2) world.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Limnologie biologique / Océanographie biologique [034] ; Biotechnologies [084]
Description Géographique
PAPOUASIE NOUVELLE GUINEE
Localisation
Fonds IRD [F B010083213]
Identifiant IRD
fdi:010083213
Contact