Chloe Baumas

All Publications

• A focus on different types of organic matter particles and their significance in the open ocean carbon cycle PROGRESS IN OCEANOGRAPHY Baumas, C., Bizic, M. 2024; 224

  View details for DOI 10.1016/j.pocean.2024.103233

  View details for Web of Science ID 001228382100001

• A novel method to sample individual marine snow particles for downstream molecular analyses LIMNOLOGY AND OCEANOGRAPHY-METHODS Baumas, C. J., Ababou, F., Garel, M., Bizic, M., Ionescu, D., Puzenat, A., Le Moigne, F. C., Grossart, H., Tamburini, C. 2023

  View details for DOI 10.1002/lom3.10590

  View details for Web of Science ID 001099991600001

• Reconstructing the ocean's mesopelagic zone carbon budget: sensitivity and estimation of parameters associated with prokaryotic remineralization BIOGEOSCIENCES Baumas, C., Fuchs, R., Garel, M., Poggiale, J., Memery, L., Le Moigne, F. C., Tamburini, C. 2023; 20 (19): 4165-4182

  View details for DOI 10.5194/bg-20-4165-2023

  View details for Web of Science ID 001161777800001

• Mesopelagic microbial carbon production correlates with diversity across different marine particle fractions ISME JOURNAL Baumas, C. J., Le Moigne, F. C., Garel, M., Bhairy, N., Guasco, S., Riou, V., Armougom, F., Grossart, H., Tamburini, C. 2021; 15 (6): 1695-1708

  Abstract

  The vertical flux of marine snow particles significantly reduces atmospheric carbon dioxide concentration. In the mesopelagic zone, a large proportion of the organic carbon carried by sinking particles dissipates thereby escaping long term sequestration. Particle associated prokaryotes are largely responsible for such organic carbon loss. However, links between this important ecosystem flux and ecological processes such as community development of prokaryotes on different particle fractions (sinking vs. non-sinking) are yet virtually unknown. This prevents accurate predictions of mesopelagic organic carbon loss in response to changing ocean dynamics. Using combined measurements of prokaryotic heterotrophic production rates and species richness in the North Atlantic, we reveal that carbon loss rates and associated microbial richness are drastically different with particle fractions. Our results demonstrate a strong negative correlation between prokaryotic carbon losses and species richness. Such a trend may be related to prokaryotes detaching from fast-sinking particles constantly enriching non-sinking associated communities in the mesopelagic zone. Existing global scale data suggest this negative correlation is a widespread feature of mesopelagic microbes.

  View details for DOI 10.1038/s41396-020-00880-z

  View details for Web of Science ID 000608003100005

  View details for PubMedID 33452475

  View details for PubMedCentralID PMC8163737

• Mesoscale variability of phosphorus stocks, hydrological and biological processes in the mixed layer in the Eastern Mediterranean Sea in autumn and during an unusually dense winter phytoplankton bloom DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS Van Wambeke, F., Taillandier, V., de Madron, X., Conan, P., Pujo-Pay, M., Psarra, S., Rabouille, S., Baumas, C., Pulido-Villena, E. 2024; 209

  View details for DOI 10.1016/j.dsr.2024.104348

  View details for Web of Science ID 001264329900001

• A RUpture-Based detection method for the Active mesopeLagIc Zone (RUBALIZ): A crucial step toward rigorous carbon budget assessments LIMNOLOGY AND OCEANOGRAPHY-METHODS Fuchs, R., Baumas, C. J., Garel, M., Nerini, D., Le Moigne, F. C., Tamburini, C. 2023; 21 (1): 24-39

  View details for DOI 10.1002/lom3.10520

  View details for Web of Science ID 000874514400001

• Bacterial Bioluminescence: Light Emission in <i>Photobacterium phosphoreum</i> Is Not Under Quorum-Sensing Control FRONTIERS IN MICROBIOLOGY Tanet, L., Tamburini, C., Baumas, C., Garel, M., Simon, G., Casalot, L. 2019; 10: 365

  Abstract

  Bacterial-bioluminescence regulation is often associated with quorum sensing. Indeed, many studies have been made on this subject and indicate that the expression of the light-emission-involved genes is density dependent. However, most of these studies have concerned two model species, Aliivibrio fischeri and Vibrio campbellii. Very few works have been done on bioluminescence regulation for the other bacterial genera. Yet, according to the large variety of habitats of luminous marine bacteria, it would not be surprising to find different light-regulation systems. In this study, we used Photobacterium phosphoreum ANT-2200, a piezophilic bioluminescent strain isolated from Mediterranean deep-sea waters (2200-m depth). To answer the question of whether or not the bioluminescence of P. phosphoreum ANT-2200 is under quorum-sensing control, we focused on the correlation between growth and light emission through physiological, genomic and, transcriptomic approaches. Unlike A. fischeri and V. campbellii, the light of P. phosphoreum ANT-2200 immediately increases from its initial level. Interestingly, the emitted light increases at much higher rate at the low cell density than it does for higher cell-density values. The expression level of the light-emission-involved genes stays constant all along the exponential growth phase. We also showed that, even when more light is produced, when the strain is cultivated at high hydrostatic pressure, no change in the transcription level of these genes can be detected. Through different experiments and approaches, our results clearly indicate that, under the tested conditions, the genes, directly involved in the bioluminescence in P. phosphoreum ANT-2200, are not controlled at a transcriptomic level. Quite obviously, these results demonstrate that the light emission of the strain is not density dependent, which means not under quorum-sensing control. Through this study, we point out that bacterial-bioluminescence regulation should not, from now on, be always linked with the quorum-sensing control.

  View details for DOI 10.3389/fmicb.2019.00365

  View details for Web of Science ID 000460264900001

  View details for PubMedID 30886606

  View details for PubMedCentralID PMC6409340