ORCID Profile
0000-0002-9886-8216
Current Organisation
Institut de recherche pour le developpement
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Publisher: Elsevier BV
Date: 05-2017
Publisher: Wiley
Date: 04-10-2021
DOI: 10.1111/MEC.16163
Abstract: Ocean acidification is posing a threat to calcifying organisms due to the increased energy requirements of calcification under high CO 2 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 CO 2 seeps of Tutum Bay (Papua New Guinea) as a natural laboratory to understand how coral holobionts offset their increased energy requirements under high CO 2 conditions. Our results demonstrate for the first time that under high p CO 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 CO 2 control site, concomitant with a restructured diazotroph community and the specific prevalence of an alpha‐proteobacterium. Further, corals at the high CO 2 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 p CO 2 world.
Publisher: Elsevier BV
Date: 10-2011
Publisher: Frontiers Media SA
Date: 2013
Publisher: Springer Science and Business Media LLC
Date: 27-06-2019
Publisher: Annual Reviews
Date: 2009
DOI: 10.1146/ANNUREV.MARINE.010908.163727
Abstract: Atmospheric inputs of iron to the open ocean are hypothesized to modulate ocean biogeochemistry. This review presents an integration of available observations of atmospheric iron and iron deposition, and also covers bioavailable iron distributions. Methods for estimating temporal variability in ocean deposition over the recent past are reviewed. Desert dust iron is estimated to represent 95% of the global atmospheric iron cycle, and combustion sources of iron are responsible for the remaining 5%. Humans may be significantly perturbing desert dust (up to 50%). The sources of bioavailable iron are less well understood than those of iron, partly because we do not know what speciation of the iron is bioavailable. Bioavailable iron can derive from atmospheric processing of relatively insoluble desert dust iron or from direct emissions of soluble iron from combustion sources. These results imply that humans could be substantially impacting iron and bioavailable iron deposition to ocean regions, but there are large uncertainties in our understanding.
Location: New Caledonia
Location: United States of America
No related grants have been discovered for Sophie Bonnet.