James Bradley
@drbradbrad.bsky.social
Earth scientist 🌎
CNRS researcher / Chaire de Professeur Junior @ Mediterranean Institute of Oceanography, Marseille, France;
Geomicrobiology, Biogeoscience, Polar & extreme environments;
ERC StG #ERC_SIESTA;
My views; He/him; 🏳️🌈ally
www.jbradleylab.com
CNRS researcher / Chaire de Professeur Junior @ Mediterranean Institute of Oceanography, Marseille, France;
Geomicrobiology, Biogeoscience, Polar & extreme environments;
ERC StG #ERC_SIESTA;
My views; He/him; 🏳️🌈ally
www.jbradleylab.com
And honestly, the importance & implications of this work can’t be overstated
So will someone please fund us?!
@matehg.bsky.social, Marc, Shamik and I have been working tirelessly to secure funding to explore this important knowledge gap
If you’re asked to review our next proposal, please be kind!
So will someone please fund us?!
@matehg.bsky.social, Marc, Shamik and I have been working tirelessly to secure funding to explore this important knowledge gap
If you’re asked to review our next proposal, please be kind!
November 6, 2025 at 2:39 PM
And honestly, the importance & implications of this work can’t be overstated
So will someone please fund us?!
@matehg.bsky.social, Marc, Shamik and I have been working tirelessly to secure funding to explore this important knowledge gap
If you’re asked to review our next proposal, please be kind!
So will someone please fund us?!
@matehg.bsky.social, Marc, Shamik and I have been working tirelessly to secure funding to explore this important knowledge gap
If you’re asked to review our next proposal, please be kind!
Such a delight working w. @matehg.bsky.social Shamik Roy & Marc Dumont
We’ve started digging into these interactions, in the field and in the lab, thanks to small consumables budgets, studentships and fieldwork grants. But this only scratches the surface of what’s needed
We’ve started digging into these interactions, in the field and in the lab, thanks to small consumables budgets, studentships and fieldwork grants. But this only scratches the surface of what’s needed
November 6, 2025 at 2:39 PM
Such a delight working w. @matehg.bsky.social Shamik Roy & Marc Dumont
We’ve started digging into these interactions, in the field and in the lab, thanks to small consumables budgets, studentships and fieldwork grants. But this only scratches the surface of what’s needed
We’ve started digging into these interactions, in the field and in the lab, thanks to small consumables budgets, studentships and fieldwork grants. But this only scratches the surface of what’s needed
Why this matters:
Soils store more carbon than the atmosphere and vegetation combined 🌲⛅
Even small reductions in microbial CUE could weaken soils as carbon sinks 🦠
This adds a biological feedback to climate change that is overlooked in carbon-cycle models 📈
Soils store more carbon than the atmosphere and vegetation combined 🌲⛅
Even small reductions in microbial CUE could weaken soils as carbon sinks 🦠
This adds a biological feedback to climate change that is overlooked in carbon-cycle models 📈
November 6, 2025 at 2:39 PM
Why this matters:
Soils store more carbon than the atmosphere and vegetation combined 🌲⛅
Even small reductions in microbial CUE could weaken soils as carbon sinks 🦠
This adds a biological feedback to climate change that is overlooked in carbon-cycle models 📈
Soils store more carbon than the atmosphere and vegetation combined 🌲⛅
Even small reductions in microbial CUE could weaken soils as carbon sinks 🦠
This adds a biological feedback to climate change that is overlooked in carbon-cycle models 📈
We think that when soil microbes are exposed to antimicrobial compounds & warming, they may allocate more carbon to defence and maintenance, than to growth 🦠
This lowers their carbon-use efficiency, meaning more carbon is respired as CO₂ & less is retained in biomass and stored in the soil 🌱
This lowers their carbon-use efficiency, meaning more carbon is respired as CO₂ & less is retained in biomass and stored in the soil 🌱
November 6, 2025 at 2:39 PM
We think that when soil microbes are exposed to antimicrobial compounds & warming, they may allocate more carbon to defence and maintenance, than to growth 🦠
This lowers their carbon-use efficiency, meaning more carbon is respired as CO₂ & less is retained in biomass and stored in the soil 🌱
This lowers their carbon-use efficiency, meaning more carbon is respired as CO₂ & less is retained in biomass and stored in the soil 🌱
Soils worldwide are warming - fastest in the Arctic 🐻❄️ where vast amounts of Earth’s carbon is stored 🌡️
Simultaneously, global antibiotic use is rising 💉 and antimicrobial compounds are increasingly leaking into natural environments 💊
What does this mean for the microbes controlling soil carbon? 🦠
Simultaneously, global antibiotic use is rising 💉 and antimicrobial compounds are increasingly leaking into natural environments 💊
What does this mean for the microbes controlling soil carbon? 🦠
November 6, 2025 at 2:39 PM
Soils worldwide are warming - fastest in the Arctic 🐻❄️ where vast amounts of Earth’s carbon is stored 🌡️
Simultaneously, global antibiotic use is rising 💉 and antimicrobial compounds are increasingly leaking into natural environments 💊
What does this mean for the microbes controlling soil carbon? 🦠
Simultaneously, global antibiotic use is rising 💉 and antimicrobial compounds are increasingly leaking into natural environments 💊
What does this mean for the microbes controlling soil carbon? 🦠
A real pleasure to give an invited talk at the 8th International Symposium on Arctic Research in Hachioji, Tokyo 🇯🇵 on @hfspo.bsky.social @erc.europa.eu #ERC_SIESTA research exploring glacier & atmosphere microbiome connectivity @mioceanologie.bsky.social @cnrs-insu.bsky.social ❄️🦠☁️🧬
October 30, 2025 at 3:53 AM
A real pleasure to give an invited talk at the 8th International Symposium on Arctic Research in Hachioji, Tokyo 🇯🇵 on @hfspo.bsky.social @erc.europa.eu #ERC_SIESTA research exploring glacier & atmosphere microbiome connectivity @mioceanologie.bsky.social @cnrs-insu.bsky.social ❄️🦠☁️🧬
Postdoc vacancy: Microbial dormancy in the cryosphere
@erc.europa.eu #ERC_SIESTA
📢 PLEASE RT
🧬 Single cell microbial activity measurements, flow cytometry, cell sorting, omics, ecological interpretation
☀️ Marseille, France
‼️ Apply ASAP & before 7 Nov
Link: emploi.cnrs.fr/Offres/CDD/U...
@erc.europa.eu #ERC_SIESTA
📢 PLEASE RT
🧬 Single cell microbial activity measurements, flow cytometry, cell sorting, omics, ecological interpretation
☀️ Marseille, France
‼️ Apply ASAP & before 7 Nov
Link: emploi.cnrs.fr/Offres/CDD/U...
October 21, 2025 at 3:48 PM
Postdoc vacancy: Microbial dormancy in the cryosphere
@erc.europa.eu #ERC_SIESTA
📢 PLEASE RT
🧬 Single cell microbial activity measurements, flow cytometry, cell sorting, omics, ecological interpretation
☀️ Marseille, France
‼️ Apply ASAP & before 7 Nov
Link: emploi.cnrs.fr/Offres/CDD/U...
@erc.europa.eu #ERC_SIESTA
📢 PLEASE RT
🧬 Single cell microbial activity measurements, flow cytometry, cell sorting, omics, ecological interpretation
☀️ Marseille, France
‼️ Apply ASAP & before 7 Nov
Link: emploi.cnrs.fr/Offres/CDD/U...
Third and final field site ⛅🇨🇴
Páramo of Iguaque ⛰️
Challenging 3 hour sunrise climb at ~3,600 m.a.s.l. carrying batteries, tripods, samplers, PPE - but so worth it to sample amongst the frailejones 🤩
Hugely grateful to Santuario de Flora y Fauna de Iguaque for allowing us to work in this sacred place
Páramo of Iguaque ⛰️
Challenging 3 hour sunrise climb at ~3,600 m.a.s.l. carrying batteries, tripods, samplers, PPE - but so worth it to sample amongst the frailejones 🤩
Hugely grateful to Santuario de Flora y Fauna de Iguaque for allowing us to work in this sacred place
October 20, 2025 at 3:59 AM
Third and final field site ⛅🇨🇴
Páramo of Iguaque ⛰️
Challenging 3 hour sunrise climb at ~3,600 m.a.s.l. carrying batteries, tripods, samplers, PPE - but so worth it to sample amongst the frailejones 🤩
Hugely grateful to Santuario de Flora y Fauna de Iguaque for allowing us to work in this sacred place
Páramo of Iguaque ⛰️
Challenging 3 hour sunrise climb at ~3,600 m.a.s.l. carrying batteries, tripods, samplers, PPE - but so worth it to sample amongst the frailejones 🤩
Hugely grateful to Santuario de Flora y Fauna de Iguaque for allowing us to work in this sacred place
Thank you Mailyn Gonzalez for hosting us @ Instituto Humboldt Bogotá 🌿
Honoured to share our work with your conservation genetics lab 🧬 whilst sampling the aeromicrobiome from the institute's beautiful grounds ⛅
@hfspo.bsky.social @mioceanologie.bsky.social @erc.europa.eu @cnrs.fr
Honoured to share our work with your conservation genetics lab 🧬 whilst sampling the aeromicrobiome from the institute's beautiful grounds ⛅
@hfspo.bsky.social @mioceanologie.bsky.social @erc.europa.eu @cnrs.fr
October 17, 2025 at 2:22 AM
Thank you Mailyn Gonzalez for hosting us @ Instituto Humboldt Bogotá 🌿
Honoured to share our work with your conservation genetics lab 🧬 whilst sampling the aeromicrobiome from the institute's beautiful grounds ⛅
@hfspo.bsky.social @mioceanologie.bsky.social @erc.europa.eu @cnrs.fr
Honoured to share our work with your conservation genetics lab 🧬 whilst sampling the aeromicrobiome from the institute's beautiful grounds ⛅
@hfspo.bsky.social @mioceanologie.bsky.social @erc.europa.eu @cnrs.fr
Some wildlife highlights while air sampling in Meta, Colombia 🇨🇴
October 16, 2025 at 1:57 AM
Some wildlife highlights while air sampling in Meta, Colombia 🇨🇴
From early morning set up to successful evening sample recovery – two back-to-back 4-hour air sampling runs at the Ecoreserva ASA "La Guarupaya” in Meta 🌿
with Laura Molares Moncayo @mioceanologie.bsky.social @nhm.org @qmulsse.bsky.social & Mailyn Gonzalez @ Instituto Humboldt, Bogotá
with Laura Molares Moncayo @mioceanologie.bsky.social @nhm.org @qmulsse.bsky.social & Mailyn Gonzalez @ Instituto Humboldt, Bogotá
October 15, 2025 at 2:23 AM
From early morning set up to successful evening sample recovery – two back-to-back 4-hour air sampling runs at the Ecoreserva ASA "La Guarupaya” in Meta 🌿
with Laura Molares Moncayo @mioceanologie.bsky.social @nhm.org @qmulsse.bsky.social & Mailyn Gonzalez @ Instituto Humboldt, Bogotá
with Laura Molares Moncayo @mioceanologie.bsky.social @nhm.org @qmulsse.bsky.social & Mailyn Gonzalez @ Instituto Humboldt, Bogotá
Buenas dias Colombia 🇨🇴
With it's equatorial setting & topographical complexity, we're sampling the aeromicrobiome across a steep altitude gradient from the savanna to the páramo ☁️🦠⛰️
First site: Ecoreserva ASA "La Guarupaya” in Meta, 400 m.a.s.l. 🌿
Collab. with Mailyn Gonzalez @ Instituto Humboldt
With it's equatorial setting & topographical complexity, we're sampling the aeromicrobiome across a steep altitude gradient from the savanna to the páramo ☁️🦠⛰️
First site: Ecoreserva ASA "La Guarupaya” in Meta, 400 m.a.s.l. 🌿
Collab. with Mailyn Gonzalez @ Instituto Humboldt
October 13, 2025 at 1:40 PM
Buenas dias Colombia 🇨🇴
With it's equatorial setting & topographical complexity, we're sampling the aeromicrobiome across a steep altitude gradient from the savanna to the páramo ☁️🦠⛰️
First site: Ecoreserva ASA "La Guarupaya” in Meta, 400 m.a.s.l. 🌿
Collab. with Mailyn Gonzalez @ Instituto Humboldt
With it's equatorial setting & topographical complexity, we're sampling the aeromicrobiome across a steep altitude gradient from the savanna to the páramo ☁️🦠⛰️
First site: Ecoreserva ASA "La Guarupaya” in Meta, 400 m.a.s.l. 🌿
Collab. with Mailyn Gonzalez @ Instituto Humboldt
📢 PLEASE RT!
❄️ M2 Masters Internship: Metagenomic analysis of microbial cold adaptation in the cryosphere
🧬 Compile & curate ice nucleation & cold-adaptation protein database
🖥️ Build HMM profiles
🦠 Analyze existing metagenomic data using HMMs
☀️ Marseille, France
Apply by 15 Oct
❄️ M2 Masters Internship: Metagenomic analysis of microbial cold adaptation in the cryosphere
🧬 Compile & curate ice nucleation & cold-adaptation protein database
🖥️ Build HMM profiles
🦠 Analyze existing metagenomic data using HMMs
☀️ Marseille, France
Apply by 15 Oct
September 15, 2025 at 11:48 AM
📢 PLEASE RT!
❄️ M2 Masters Internship: Metagenomic analysis of microbial cold adaptation in the cryosphere
🧬 Compile & curate ice nucleation & cold-adaptation protein database
🖥️ Build HMM profiles
🦠 Analyze existing metagenomic data using HMMs
☀️ Marseille, France
Apply by 15 Oct
❄️ M2 Masters Internship: Metagenomic analysis of microbial cold adaptation in the cryosphere
🧬 Compile & curate ice nucleation & cold-adaptation protein database
🖥️ Build HMM profiles
🦠 Analyze existing metagenomic data using HMMs
☀️ Marseille, France
Apply by 15 Oct
2 Postdoc vacancies: Microbial dormancy in the cryosphere
@erc.europa.eu #ERC_SIESTA
📢 PLEASE RT
Experimental:
🧬 Single cell microbial activity measurements, flow cytometry, omics, biogeochem
Modelling:
🖥️ Bioenergetics, thermodynamics, ecological, biogeochem
☀️ Marseille, France
‼️ Apply by 30 Sept
@erc.europa.eu #ERC_SIESTA
📢 PLEASE RT
Experimental:
🧬 Single cell microbial activity measurements, flow cytometry, omics, biogeochem
Modelling:
🖥️ Bioenergetics, thermodynamics, ecological, biogeochem
☀️ Marseille, France
‼️ Apply by 30 Sept
September 10, 2025 at 8:11 AM
2 Postdoc vacancies: Microbial dormancy in the cryosphere
@erc.europa.eu #ERC_SIESTA
📢 PLEASE RT
Experimental:
🧬 Single cell microbial activity measurements, flow cytometry, omics, biogeochem
Modelling:
🖥️ Bioenergetics, thermodynamics, ecological, biogeochem
☀️ Marseille, France
‼️ Apply by 30 Sept
@erc.europa.eu #ERC_SIESTA
📢 PLEASE RT
Experimental:
🧬 Single cell microbial activity measurements, flow cytometry, omics, biogeochem
Modelling:
🖥️ Bioenergetics, thermodynamics, ecological, biogeochem
☀️ Marseille, France
‼️ Apply by 30 Sept
Successfully defended my Habilitation à Diriger des Recherches (HDR - France's highest academic qualification) at @mioceanologie.bsky.social on Monday. Thanks to all who attended and especially the committee 😃🎓🌎🧬❄️🦠🌊
September 5, 2025 at 11:39 AM
Successfully defended my Habilitation à Diriger des Recherches (HDR - France's highest academic qualification) at @mioceanologie.bsky.social on Monday. Thanks to all who attended and especially the committee 😃🎓🌎🧬❄️🦠🌊
We outline & discuss many theoretical & model approaches 📝
We also outline how, despite many applications & insights, modelling isn't an end in itself 🔖
We also need biological physical & chemical developments in experimentation and observation 🔬
Do you think the atmosphere is a true ecosystem? 🌨️
We also outline how, despite many applications & insights, modelling isn't an end in itself 🔖
We also need biological physical & chemical developments in experimentation and observation 🔬
Do you think the atmosphere is a true ecosystem? 🌨️
July 31, 2025 at 9:42 AM
We outline & discuss many theoretical & model approaches 📝
We also outline how, despite many applications & insights, modelling isn't an end in itself 🔖
We also need biological physical & chemical developments in experimentation and observation 🔬
Do you think the atmosphere is a true ecosystem? 🌨️
We also outline how, despite many applications & insights, modelling isn't an end in itself 🔖
We also need biological physical & chemical developments in experimentation and observation 🔬
Do you think the atmosphere is a true ecosystem? 🌨️
We outline how theory & models can advance knowledge of the aeromicrobiome by exploring:
🧪 catabolism & anabolism
🦠 microbial physiology & metabolic states
⚡ thermodynamics & bioenergetics
🌩️ atmosphere & bioaerosol properties
🌪️ microbe transport & residence time
🛠️ bottom-up & top-down approaches
🧪 catabolism & anabolism
🦠 microbial physiology & metabolic states
⚡ thermodynamics & bioenergetics
🌩️ atmosphere & bioaerosol properties
🌪️ microbe transport & residence time
🛠️ bottom-up & top-down approaches
July 31, 2025 at 9:42 AM
We outline how theory & models can advance knowledge of the aeromicrobiome by exploring:
🧪 catabolism & anabolism
🦠 microbial physiology & metabolic states
⚡ thermodynamics & bioenergetics
🌩️ atmosphere & bioaerosol properties
🌪️ microbe transport & residence time
🛠️ bottom-up & top-down approaches
🧪 catabolism & anabolism
🦠 microbial physiology & metabolic states
⚡ thermodynamics & bioenergetics
🌩️ atmosphere & bioaerosol properties
🌪️ microbe transport & residence time
🛠️ bottom-up & top-down approaches
Walking over millions of years of history, preserved in Svalbard’s rocks. Not a bad haul so far 🍃🪸
#ERC_SIESTA
#ERC_SIESTA
July 28, 2025 at 5:40 AM
Walking over millions of years of history, preserved in Svalbard’s rocks. Not a bad haul so far 🍃🪸
#ERC_SIESTA
#ERC_SIESTA
Friday nights in the field lab: incubations running. #ERC_SIESTA fieldwork Svalbard
@reymourot.bsky.social @drmartinezrabert.bsky.social @mioceanologie.bsky.social
@reymourot.bsky.social @drmartinezrabert.bsky.social @mioceanologie.bsky.social
July 25, 2025 at 7:36 PM
Friday nights in the field lab: incubations running. #ERC_SIESTA fieldwork Svalbard
@reymourot.bsky.social @drmartinezrabert.bsky.social @mioceanologie.bsky.social
@reymourot.bsky.social @drmartinezrabert.bsky.social @mioceanologie.bsky.social
Team #ERC_SIESTA in Svalbard ❄️🧬🐻❄️🦠🏔️🌎🔬
@reymourot.bsky.social @drmartinezrabert.bsky.social @mioceanologie.bsky.social
@reymourot.bsky.social @drmartinezrabert.bsky.social @mioceanologie.bsky.social
July 25, 2025 at 5:10 PM
Team #ERC_SIESTA in Svalbard ❄️🧬🐻❄️🦠🏔️🌎🔬
@reymourot.bsky.social @drmartinezrabert.bsky.social @mioceanologie.bsky.social
@reymourot.bsky.social @drmartinezrabert.bsky.social @mioceanologie.bsky.social
And thanks to our funders including @erc.europa.eu projects #ERC_SIESTA and CoEvolve, Italy’s MUR/PRA Melting-ICE, Winter-CZ, NERC SUN SPEARS & Arctic Research Station Access Scheme, France’s @agencerecherche.bsky.social ANR23-CPJ1-0172-01 & @hfspo.bsky.social RGY0058/2022
July 21, 2025 at 12:42 PM
And thanks to our funders including @erc.europa.eu projects #ERC_SIESTA and CoEvolve, Italy’s MUR/PRA Melting-ICE, Winter-CZ, NERC SUN SPEARS & Arctic Research Station Access Scheme, France’s @agencerecherche.bsky.social ANR23-CPJ1-0172-01 & @hfspo.bsky.social RGY0058/2022
I'm grateful to my brilliant collaborator, friend & co-lead @donatogiovannelli.bsky.social & our fantastic team Laura Molares Moncayo, Gabriella Gallo, Jacopo Brusca, Tessa Viglezio & @jacopaso.bsky.social. Thanks to CNR, Dirigibile Italia, @ukarcticstation.bsky.social NPI Sverdrup & Kings Bay 🙏
July 21, 2025 at 12:42 PM
I'm grateful to my brilliant collaborator, friend & co-lead @donatogiovannelli.bsky.social & our fantastic team Laura Molares Moncayo, Gabriella Gallo, Jacopo Brusca, Tessa Viglezio & @jacopaso.bsky.social. Thanks to CNR, Dirigibile Italia, @ukarcticstation.bsky.social NPI Sverdrup & Kings Bay 🙏
We wrote this piece while still in Svalbard — maybe to process the weight of what we were witnessing.
The mood in Ny-Ålesund was somber.
Writing was a way to reflect, respond & speak from a place few get to see in winter 🌚
We want our experience on the front line of Arctic change to be heard widely
The mood in Ny-Ålesund was somber.
Writing was a way to reflect, respond & speak from a place few get to see in winter 🌚
We want our experience on the front line of Arctic change to be heard widely
July 21, 2025 at 12:42 PM
We wrote this piece while still in Svalbard — maybe to process the weight of what we were witnessing.
The mood in Ny-Ålesund was somber.
Writing was a way to reflect, respond & speak from a place few get to see in winter 🌚
We want our experience on the front line of Arctic change to be heard widely
The mood in Ny-Ålesund was somber.
Writing was a way to reflect, respond & speak from a place few get to see in winter 🌚
We want our experience on the front line of Arctic change to be heard widely
Climate policy must catch up to the reality that the Arctic is changing much faster than expected, with winter at the heart ❄️
There's a gap between climate findings and on-the-ground preparedness ⛏️
Arctic systems, communities & infrastructure remain highly vulnerable to new conditions & extremes 🌡️
There's a gap between climate findings and on-the-ground preparedness ⛏️
Arctic systems, communities & infrastructure remain highly vulnerable to new conditions & extremes 🌡️
July 21, 2025 at 12:42 PM
Climate policy must catch up to the reality that the Arctic is changing much faster than expected, with winter at the heart ❄️
There's a gap between climate findings and on-the-ground preparedness ⛏️
Arctic systems, communities & infrastructure remain highly vulnerable to new conditions & extremes 🌡️
There's a gap between climate findings and on-the-ground preparedness ⛏️
Arctic systems, communities & infrastructure remain highly vulnerable to new conditions & extremes 🌡️
February’s thaw wasn’t a one-off 🌡️
But witnessing it first-hand was a stark reminder of how fast the Arctic is changing - and made us question if our climate warnings have been too cautious.
Winter warming has already passed the melting point.
These aren’t anomalies.
This is the new Arctic.
But witnessing it first-hand was a stark reminder of how fast the Arctic is changing - and made us question if our climate warnings have been too cautious.
Winter warming has already passed the melting point.
These aren’t anomalies.
This is the new Arctic.
July 21, 2025 at 12:42 PM
February’s thaw wasn’t a one-off 🌡️
But witnessing it first-hand was a stark reminder of how fast the Arctic is changing - and made us question if our climate warnings have been too cautious.
Winter warming has already passed the melting point.
These aren’t anomalies.
This is the new Arctic.
But witnessing it first-hand was a stark reminder of how fast the Arctic is changing - and made us question if our climate warnings have been too cautious.
Winter warming has already passed the melting point.
These aren’t anomalies.
This is the new Arctic.