期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 219, 期 17, 页码 2608-2612出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jeb.139451
关键词
Scleractinian corals; Heterotrophic nutrition; Cyanothece; N-2 fixation; New Caledonia
类别
资金
- LabEx-Corail DIADOM project
- LabEx-Corail COCAUNUT project
- Agence Nationale de la Recherche (ANR starting grant VAHINE) [ANR-13-JS06-0002]
- People Programme (Marie Sklodowska-Curie Actions) of the European Union's Seventh Framework Programme (FP7) under Research Executive Agency (REA) [625185]
- Institut de Recherche pour le Developpement (IRD)
- Agence Nationale de la Recherche (ANR) [ANR-13-JS06-0002] Funding Source: Agence Nationale de la Recherche (ANR)
Corals aremixotrophs: they are able to fix inorganic carbon through the activity of their symbiotic dinoflagellates and to gain nitrogen from predation on plankton and uptake of dissolved organic and inorganic nutrients. They also live in close association with diverse diazotrophic communities, inhabiting their skeleton, tissue and mucus layer, which are able to fix dinitrogen (N-2). The quantity of fixed N-2 transferred to the corals and its distribution within coral compartments as well as the quantity of nitrogen assimilated through the ingestion of planktonic diazotrophs are still unknown. Here, we quantified nitrogen assimilation via (i) N-2 fixation by symbiont diazotrophs, (ii) ingestion of cultured unicellular diazotrophs and (iii) ingestion of natural planktonic diazotrophs. We estimate that the ingestion of diazotrophs provides 0.76 Alpha +/- 0.15 mu g N cm(-2) h(-1), suggesting that diazotrophs represent a non-negligible source of nitrogen for scleractinian corals.
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