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David Demory

@d2mory.bsky.social
478 followers 700 following 24 posts

Quantitative microbial ecology and evolution, oceanography, microbes and their viruses. Researcher @cnrs.bsky.social and @OOBanyuls.

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Reposted by David Demory
Maxine Pruvôt @maxinepruvot.bsky.social · 27/08/2026
Happy to share the publication of my first PhD research article! 'Connecting models, networks, and experiments: Revisiting the role of viruses in marine carbon cycling' Out now in Limnology and Oceanography @aslo.org Full text: doi.org/10.1002/lno....
doi.org
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Reposted by David Demory
Joshua Weitz @joshuasweitz.bsky.social · 15/07/2026
Bacteriophage continue to have so much to teach us. It's in our interest to understand how they work and impact human & environmental health. New joint work led by @mariandm.bsky.social & @rantahan.bsky.social inferring single-cell latent period & burst size heterogeneity from population dynamics.
science.org
Inferring single-cell heterogeneity of bacteriophage lysis-associated life-history traits from population-scale dynamics
Theory-guided experiments reveal single-cell heterogeneity of lysis-associated bacteriophage traits from population scale data.
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Joshua Weitz @joshuasweitz.bsky.social · 29/05/2026
Viruses are highly abundant in the oceans, but there is one place you won't typically find them: in global ocean ecosystem models... until now. Introducing "vDarwin", an explicit integration of viruses into the MITgcm/Darwin global ecosystem framework: www.biorxiv.org/content/10.6... a 🧵
Integration of a model of viral lysis, shunt and shuttle in a large scale ocean circulation model. (A) Schematic of the large scale ocean circulation model (MITgcm): major surface ocean circulation patterns and the schematic of the advection/diffusion are represented. Note that vertical grid spacing increases with depth (i.e., layers become thicker). (B) Simplified ecosystem represented in the study. For simplicity nitrogen remineralization to nitrite and nitrate and mortality fluxes to DOM and POM are not represented. (C) Schematic of the vDarwin ecosystem model integrated in the large scale circulation model. It represents a simplification of the ecosystem presented in (B) assuming that N is the limiting nutrient. It includes the growth of a single phytoplankton type, viral lysis, zooplankton grazing, the viral shunt and shuttle and remineralization (note that remineralizing bacteria are not explicitly represented).
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David Demory @d2mory.bsky.social · 15/02/2026
🎓 𝗧𝗵𝗮𝗻𝗸𝘀 𝘁𝗼 𝗼𝘂𝗿 𝗙𝘂𝗻𝗱𝗶𝗻𝗴: PhD grant from Institut de l'Océan @sorbonne-universite.fr. #MarineMicrobiology #CarbonCycling #ViralEcology #Oceanography #Modelling
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David Demory @d2mory.bsky.social · 15/02/2026
👥 𝗔𝘂𝘁𝗵𝗼𝗿𝘀: @maxinepruvot.bsky.social, Bart Haegeman, @jouxf.bsky.social and @d2mory.bsky.social. 🏛️𝗜𝗻𝘀𝘁𝗶𝘁𝘂𝘁𝗶𝗼𝗻𝘀: @lomicumr7621.bsky.social , LBBM, @cnrs-insu.bsky.social, @cnrsbiologie.bsky.social, @cnrsecologie.bsky.social and @sorbonne-universite.fr.
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David Demory @d2mory.bsky.social · 15/02/2026
𝗧𝗮𝗸𝗲𝗮𝘄𝗮𝘆: This work provides clarifications for interpreting and reconciling diverse estimates of viral impacts on marine carbon fluxes.
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David Demory @d2mory.bsky.social · 15/02/2026
𝗞𝗲𝘆 𝗶𝗻𝘀𝗶𝗴𝗵𝘁𝘀 (3/3): 𝗩𝗶𝗿𝘂𝘀 𝗿𝗲𝗺𝗼𝘃𝗮𝗹 Comparing models with and without viruses does not reliably predict viral lysis impacts on ecosystem responses, as carbon pathways reorganize dynamically.
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David Demory @d2mory.bsky.social · 15/02/2026
𝗞𝗲𝘆 𝗶𝗻𝘀𝗶𝗴𝗵𝘁𝘀 (2/3): 𝗠𝗼𝗱𝗲𝗹 𝗰𝗼𝗺𝗽𝗮𝗿𝗶𝘀𝗼𝗻 Published theoretical estimates of viral contributions to carbon cycling span nearly the full range of possible values, highlighting substantial uncertainty related to parameterization and ecological variability.
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David Demory @d2mory.bsky.social · 15/02/2026
𝗞𝗲𝘆 𝗶𝗻𝘀𝗶𝗴𝗵𝘁𝘀 (1/3): 𝗖𝗼𝗻𝗰𝗲𝗽𝘁𝘂𝗮𝗹 𝗰𝗹𝗮𝗿𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗼𝗻 𝘃𝗶𝗿𝘂𝘀 𝗹𝘆𝘀𝗶𝘀 % Virus-induced mortality rates (process-based) and virus-mediated carbon fluxes (flux-based) are often conflated in the literature and cannot be directly compared.
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David Demory @d2mory.bsky.social · 15/02/2026
In this work, we integrate dynamical models, flux networks, and experimental assays (e.g., dilution assays) into a common mathematical framework.
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David Demory @d2mory.bsky.social · 15/02/2026
Excited to share our grad student Maxine Pruvot’s (@maxinepruvot.bsky.social) first PhD preprint: 𝗥𝗲𝘃𝗶𝘀𝗶𝘁𝗶𝗻𝗴 𝗺𝗲𝘁𝗵𝗼𝗱𝘀 𝗳𝗼𝗿 𝗾𝘂𝗮𝗻𝘁𝗶𝗳𝘆𝗶𝗻𝗴 𝘁𝗵𝗲 𝗿𝗼𝗹𝗲 𝗼𝗳 𝘃𝗶𝗿𝗮𝗹 𝗹𝘆𝘀𝗶𝘀 𝗶𝗻 𝗺𝗮𝗿𝗶𝗻𝗲 𝗰𝗮𝗿𝗯𝗼𝗻 𝗰𝘆𝗰𝗹𝗶𝗻𝗴 🔗 Full text: www.biorxiv.org/content/10.64898/2026.02.12.705374v1
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David Demory @d2mory.bsky.social · 15/02/2026
𝗧𝗮𝗸𝗲𝗮𝘄𝗮𝘆: This work provides clarifications for interpreting and reconciling diverse estimates of viral impacts on marine carbon fluxes.
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David Demory @d2mory.bsky.social · 15/02/2026
𝗞𝗲𝘆 𝗶𝗻𝘀𝗶𝗴𝗵𝘁𝘀 (3/3): 𝗩𝗶𝗿𝘂𝘀 𝗿𝗲𝗺𝗼𝘃𝗮𝗹: Comparing models with and without viruses does not reliably predict viral lysis impacts on ecosystem responses, as carbon pathways reorganize dynamically.
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David Demory @d2mory.bsky.social · 15/02/2026
𝗞𝗲𝘆 𝗶𝗻𝘀𝗶𝗴𝗵𝘁𝘀 (2/3): 𝗠𝗼𝗱𝗲𝗹 𝗰𝗼𝗺𝗽𝗮𝗿𝗶𝘀𝗼𝗻: Published theoretical estimates of viral contributions to carbon cycling span nearly the full range of possible values, highlighting substantial uncertainty related to parameterization and ecological variability.
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David Demory @d2mory.bsky.social · 15/02/2026
𝗞𝗲𝘆 𝗶𝗻𝘀𝗶𝗴𝗵𝘁𝘀 (1/3): 𝗖𝗼𝗻𝗰𝗲𝗽𝘁𝘂𝗮𝗹 𝗰𝗹𝗮𝗿𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗼𝗻 𝘃𝗶𝗿𝘂𝘀 𝗹𝘆𝘀𝗶𝘀 %: Virus-induced mortality rates (process-based) and virus-mediated carbon fluxes (flux-based) are often conflated in the literature and cannot be directly compared.
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David Demory @d2mory.bsky.social · 15/02/2026
In this work, we integrate dynamical models, flux networks, and experimental assays (e.g., dilution assays) into a common mathematical framework.
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David Demory @d2mory.bsky.social · 06/10/2025
Thanks for the great collaboration with Prof. Hiro Ogata and Dr. Hisashi Endo at the Institute of Chemical Research of @kyotouniversity.bsky.social; Prof. @joshuasweitz.bsky.social at the @umaryland.edu; and our funders, The @simonsfoundation.org and the ICM at Kyoto University 🙏
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David Demory @d2mory.bsky.social · 06/10/2025
We integrated mathematical modelling with in situ metagenomics using the TARA Oceans and TARA Arctic datasets, and we recapitulated virus presence and absence in the ocean through a model describing temperature-driven cell-based interactions between viruses and phytoplankton.
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David Demory @d2mory.bsky.social · 06/10/2025
Happy to share our new work on Temperature-driven biogeography of marine viruses infecting Micromonas: academic.oup.com/ismecommun/a...
academic.oup.com
Temperature-driven biogeography of marine giant viruses infecting picoeukaryotes Micromonas
Abstract. Climate shapes the biogeography of microbial and viral communities in the ocean. Among abiotic factors, temperature is one of the main drivers of
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David Demory @d2mory.bsky.social · 17/06/2025
PhD opportunity in marine virus eco-evo dynamics Joint CNRS–UBC program: @cnrsbiologie.bsky.social × @ubcoceans.bsky.social 📍 Banyuls-sur-Mer, France (LBBM UMR8176) 🗓️ Start: Oct 2025 | Duration: 3 years 🔍 Skills: Modelling, Bioinformatics, Marine Virology 🔗 Apply: emploi.cnrs.fr/Offres/Docto...
emploi.cnrs.fr
Portail Emploi CNRS - Offre d'emploi - Contract doctoral M/F- integrative biology of photosynthetic organisms and associated microorganisms
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Leïla Ezzat @layeb.bsky.social · 02/01/2025
Grateful for the opportunity to work with such an amazing team, to our collaborators around the 🌍 and the Nomis foundation for supporting our work. New insights into the diversity and biogeography of bacteria in glacier-fed streams across 11 mountain ranges, out now in @nature.com
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BejaLabTechnion @bejalab.bsky.social · 11/01/2025
Cold Surface Waters of the Sub-Antarctic Pacific Ocean Support High Cyanophage Abundances and Infection Levels enviromicro-journals.onlinelibrary.wiley.com/doi/10.1111/... @biologytechnion.bsky.social
enviromicro-journals.onlinelibrary.wiley.com
Cold Surface Waters of the Sub‐Antarctic Pacific Ocean Support High Cyanophage Abundances and Infection Levels
Here, we investigated the abundance of cyanophages and the extent to which they infect Synechococcus and Prochlorococcus, important primary producers, in the cold, low-light, iron-limited, sub-Antarc...
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Reposted by David Demory
Camelia S. Gochev @camelia-s-gochev.bsky.social · 13/01/2025
Happy to share that our work on viral infection of cyanobacteria in the Southern Ocean has been published 🦠❄️🌊 doi.org/10.1111/1462... Thank you to all the collaborators in this project @d2mory.bsky.social @joshuasweitz.bsky.social @biologytechnion.bsky.social
doi.org
Cold Surface Waters of the Sub‐Antarctic Pacific Ocean Support High Cyanophage Abundances and Infection Levels
Here, we investigated the abundance of cyanophages and the extent to which they infect Synechococcus and Prochlorococcus, important primary producers, in the cold, low-light, iron-limited, sub-Antarc...
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David Demory @d2mory.bsky.social · 17/12/2024
Japan w/ Hisashi Endo and Hiroyuki Ogata at ICR Kyoto Univ, USA w/ @joshuasweitz.bsky.social at Univ. of Maryland and France w/ @cnrsbiologie.bsky.social, @sorbonne-universite.fr, @sbroscoff.bsky.social, LBBM at OOB Banyuls and Tara Oceans Foundation.
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David Demory @d2mory.bsky.social · 17/12/2024
Our results highlight that temperature-driven cellular mechanisms can drive the community dynamics and biogeography of marine viruses. This multidisciplinary study has been possible through great collaborations involving 3 continents: (5/6)
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David Demory @d2mory.bsky.social · 17/12/2024
We used a mathematical model describing the temperature-driven virus-host dynamics to predict MpV-s distribution. We found that viral abilities to lyse and infect were good predictors of MpV-s presence and absence. (4/6)
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David Demory @d2mory.bsky.social · 17/12/2024
By reconstructing virus phylogeny, we found that MpV-s were clustered into cryophile groups, growing mainly at low temperature below 10°C, or cryo-mesophile groups, growing from cold to more than 20°C. (3/6)
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David Demory @d2mory.bsky.social · 17/12/2024
We focused on prasnoviurses infecting Micromonas (MpV), a picoeukaryote genus distributed from poles to tropics. We explored the distribution of isolated MpV-s in Tara datasets and highlighted that temperature is the main descriptor of their community composition. (2/6)
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David Demory @d2mory.bsky.social · 17/12/2024
Delighted to share our new preprint on bioRxiv: www.biorxiv.org/content/10.1... Where we integrated viral metagenomics and mathematical modelling to explore the temperature-driven biogeography of marine giant viruses - where do they live and why? (1/6)
biorxiv.org
Temperature-driven biogeography of marine giant viruses infecting the picoeukaryote Micromonas
Climate shapes the biogeography of microbial and viral communities in the ocean. Among abiotic factors, temperature is one of the main drivers of microbial community distribution. However, we lack kno...
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Joshua Weitz @joshuasweitz.bsky.social · 02/12/2024
Delighted to share this paper out via Virus Evolution: academic.oup.com/ve/advance-a... in which we develop and assess a quantitative method to infer phage and bacterial mutations driving changes in infection phenotypes arising in coevolutionary dynamics. a 🧵 about people (and some science)
Predicted infections with phage/host mutation models
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David Demory @d2mory.bsky.social · 05/12/2024
We are delighted to announce that the registrations are now open for the 12th Aquatic Virus Workshop (AVW12), to be held in Banyuls-sur-Mer (France), May 5-9 2025. Consider to register early because we have limited space! avw12.sciencesconf.org avw12.sciencesconf.org/data/header/...
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