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Johan Renaudie

@plannapus.bsky.social
297 followers 664 following 35 posts

Micropaleontologist. #Radiolaria 🔬🌊🦠

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Johan Renaudie @plannapus.bsky.social · 26/08/2026
Honestly, by now, you would think they are the exceptions but i swear it still feels like it's 4 out of 5.
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PAGES (Past Global Changes) @pages-ipo.bsky.social · 21/04/2026
🥳 It’s out! 📢 New PAGES Magazine: “The essence of time” Explore gaps, challenges & future directions in geological dating - from biostratigraphy to radioisotopic methods. ⭐ Read here: pastglobalchanges.org/publications... #PAGES #Paleoscience #EarthScience @marumunibremen.bsky.social
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Johan Renaudie @plannapus.bsky.social · 19/03/2026
male/female/diverse
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Johan Renaudie @plannapus.bsky.social · 18/03/2026
I heard a stratigraphy joke but it was a bit dated.
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Wolfgang Kiessling @kiessl.bsky.social · 12/02/2026
New paper emerging from our Paleosynthesis project @paleosynth.bsky.social. In www.nature.com/articles/s41..., we highlight the value of databases to #paleontology and the importantce of sustained funding. Our finding are probably applicable to other science fields as well.
nature.com
The billion-dollar case for sustaining palaeontology’s digital databases - Nature Ecology & Evolution
The authors survey community palaeontological databases, documenting their contributions to science as well as their vulnerabilities, and provide recommendations for the future of open science databas...
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Emma Dunne @emmadnn.bsky.social · 11/02/2026
🚨 Hot off the press: Our look into of the palaeontological database landscape and its sustainability into the future. Palaeo databases are invaluable and continue to transform our research field - but they are vulnerable... (1/6) 🧪 ⛏️ www.nature.com/articles/s41...
nature.com
The billion-dollar case for sustaining palaeontology’s digital databases - Nature Ecology & Evolution
The authors survey community palaeontological databases, documenting their contributions to science as well as their vulnerabilities, and provide recommendations for the future of open science databas...
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Dr. Bethany Allen @bethanyjallen.bsky.social · 11/02/2026
What do we want? Fossil databases! 🐚🦕 When do we want them? Forever! 🗓️ Nice new paper highlighting how academic funding systems and digital architecture need to change, to ensure we can protect and sustain our precious fossil data 📚 www.nature.com/articles/s41...
nature.com
The billion-dollar case for sustaining palaeontology’s digital databases - Nature Ecology & Evolution
The authors survey community palaeontological databases, documenting their contributions to science as well as their vulnerabilities, and provide recommendations for the future of open science databas...
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Johan Renaudie @plannapus.bsky.social · 03/02/2026
(not that it compares to the evil of his theories on social darwinism but people still idolizing his naturalist work rubs me the wrong way)
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Johan Renaudie @plannapus.bsky.social · 03/02/2026
Also he was a fraud. There is quite a lengthy literature on the fraudulent aspect of the embryos illustrating the 'ontogeny recapitulates philogeny' and, speaking as a radiolarian specialist, many of the radiolarian specimens he illustrated are at best chimeras or whatever fitted his theories.
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Johan Renaudie @plannapus.bsky.social · 13/01/2026
Yes indeed, it s a feature they added only a couple of years ago so i would image most people don t know about it. Similarly there was a time when there was no link to the paper on those pages.
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Johan Renaudie @plannapus.bsky.social · 13/01/2026
That and the 'Download' and 'Request' button are identical, and at the same place.
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Johan Renaudie @plannapus.bsky.social · 13/01/2026
If ResearchGate had a way to cancel a request, it wouldn't be an issue. The way the pages are designed, the button to request/download the paper is very prominent but the licence or the link to the paper isn't. And once you realize you just asked for a copy of an open access paper, it is too late.
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Proceedings of the National Academy of Sciences @pnas.org · 03/01/2026
West Antarctic Ice Sheet glaciers underwent at least five major inland retreats during the Pliocene—a period with temperatures similar to projected future warming—suggesting the possibility of meter-scale global sea-level rise in our future. In PNAS: ow.ly/I6NZ50XRaap
Conceptual models of ice-sheet extent and associated depositional processes along a transect. During peak interglacials with inland ice-sheet retreat, icebergs calve from the retreating ice margin and drift onto the Amundsen Sea shelf. As these icebergs ground and melt, they release most of their detritus on the shelf. During early glacial stages, the ice masses around the Amundsen Sea embayment could regrow rapidly and coalesce into an ice sheet. The advancing grounded ice “bulldozed” the sediments, which had accumulated on the shelf during the previous interglacial, toward the shelf break. From there, the fine-grained detritus is transported down to the continental slope mainly by gravitational processes.
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Christine Siddoway @iphigenesdream.bsky.social · 23/12/2025
The #ThwaitesGlacier region has a prior history of dramatic #glacial-deglacial switching in the #Pliocene www.pnas.org/doi/10.1073/...
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Maggi Brisbin @margaretbrisbin.bsky.social · 23/12/2025
Only have a dissecting scope onboard, unfortunately.
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EcoEvoRxiv @ecoevorxiv.bsky.social · 16/11/2025
Response to “Radiolarian evolution: Analytical challenges in estimating the diversity and origin of Nature’s stars” doi.org/10.32942/X2V...
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EcoEvoRxiv @ecoevorxiv.bsky.social · 13/09/2025
Fossils for Future: the billion-dollar case for paleontology’s digital infrastructure DOI: doi.org/10.32942/X2D...
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PaleoSynthesis @paleosynth.bsky.social · 07/07/2025
BioDeeptime has made it into Science! "Climate is changing fast—and forests are 200 years behind". A sweeping new analysis of ancient pollen and modern data reveals this dramatic lag—and its consequences."(from ScienceDaily) - article: DOI: 10.1126/science.adr6700 CONGRATULATIONS to the authors.
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Lee Hsiang Liow (廖珕庠) @lhliow.bsky.social · 06/07/2025
Vegetation might not be able to keep up with current rates of environmental change, given data from the pollen fossil record. Fun doing this work with David Fastovich in the lead, but sobering www.science.org/doi/10.1126/...
science.org
Coupled, decoupled, and abrupt responses of vegetation to climate across timescales
Climate and ecosystem dynamics vary across timescales, but research into climate-driven vegetation dynamics usually focuses on singular timescales. We developed a spectral analysis–based approach that...
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Sandra Passchier @passchier.bsky.social · 01/07/2025
Check out our latest #IODP #Exp379 contribution about the #Antarctic Ice Sheet's history @natcomms.nature.com. Read the full article here: rdcu.be/euikE
rdcu.be
West Antarctic ice retreat and paleoceanography in the Amundsen Sea in the warm early Pliocene
Nature Communications - A geological climate archive documents the effects of ocean warming on Antarctic marine ice-sheets. Large sediment fluxes from the interior of West Antarctica precede the...
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Johan Renaudie @plannapus.bsky.social · 30/06/2025
Indeed it seems to work again. I hadnt been able to reach anything since a couple of days.
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Johan Renaudie @plannapus.bsky.social · 30/06/2025
Is it just for me or are all the IODP Proceedings currently unreachable? I'm getting Error 403 on all of them and the individual DOIs lead to Error: DOI not found.
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Johan Renaudie @plannapus.bsky.social · 07/05/2025
Now published online in Current Biology! www.cell.com/current-biol...
cell.com
Extant diversity, biogeography, and evolutionary history of Radiolaria
Sandin et al. reveal a vast, overlooked molecular diversity of Radiolaria, likely skeleton-less, contrasting the traditional view of their star-shaped skeleton. Such comprehensive Radiolaria diversity...
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Johan Renaudie @plannapus.bsky.social · 22/04/2025
And it is finally out! bg.copernicus.org/articles/22/...
bg.copernicus.org
Cenozoic pelagic accumulation rates and biased sampling of the deep-sea record
Abstract. Global weathering is the primary control of the Earth's climate over geologic timescales, converting atmospheric pCO2 into dissolved bicarbonate, with carbon sequestration by marine plankton...
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Johan Renaudie @plannapus.bsky.social · 26/03/2025
sorry i meant setdiff(tree$tip.label, rownames(Ages))
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Johan Renaudie @plannapus.bsky.social · 26/03/2025
You would need to check setdiff(names(tree$tip.label),rownames(Ages)) in order to compare properly instead of just names(tree). tree is a list object that contain the names of the tips, the shapes of the edges, and potentially many more items.
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Johan Renaudie @plannapus.bsky.social · 04/03/2025
OK :) So yes 15% seems high indeed.
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Johan Renaudie @plannapus.bsky.social · 04/03/2025
Are you looking for a specific taxonomic group?
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Johan Renaudie @plannapus.bsky.social · 04/03/2025
So given most taxonomists started publishing names before 2011 and in journal with physical copies, they might not even be aware of the existence of zoobank, and/or don't see the point of entering name (i. e. doing extra work) in it if they don't have to. That would be my guess. 2/2
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Johan Renaudie @plannapus.bsky.social · 04/03/2025
Since 2011, the code of zoological nomenclature was amended to say that new names have to be entered in zoobank, IF they are published in an online-only journal. 1/2
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Johan Renaudie @plannapus.bsky.social · 26/11/2024
I also have an account on Mastodon. I like it personally but only the few people I followed who were tech-oriented made the jump, perhaps unsurprisingly.
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Johan Renaudie @plannapus.bsky.social · 26/11/2024
I deleted my account two months ago.
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Johan Renaudie @plannapus.bsky.social · 26/11/2024
[...] my former institution in Germany and most of the people working there also did not make the jump, and (most damaging for me) i am also missing all the regional news/politicians from the region i am from in Southern France. 2/2
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Johan Renaudie @plannapus.bsky.social · 26/11/2024
While most of the twitter folks that I followed from english-speaking countries (and to some extent from South America) made it here, I am still missing the others: namely my Japanese colleagues (which were making the bulk of Micropaleontology Twitter) are not here yet, [...] 1/2
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John Burns @burnsajohn.bsky.social · 24/11/2024
A bunch of cells of the nasselarian radiolarian Plagiacantha arachnoides--like a group of little spiders! Plus a couple of bonus acantharians. From the gulf of maine #protistaday #protistsonsky #marinelife
A group of radiolarians isolated from a plankton tow.
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Johan Renaudie @plannapus.bsky.social · 23/11/2024
Certainly sturdier than Woodhenge and Hayhenge at least.
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Serjoscha Evers @sirjoscha.bsky.social · 14/11/2024
Second paper in Ecology & Evolution out in two consecutive days! 🐢🤩🐢 "Functional and character disparity are decoupled in turtle mandibles", w team fr MfN Berlin (incl. @plannapus.bsky.social) I guess the German chancellor would call this a "Doppel-Wumms" 😜 onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
Functional and Character Disparity Are Decoupled in Turtle Mandibles
Here, we compare functional disparity measured by biomechanical proxies and character disparity measured by discrete morphological characters in turtle jaws. Exploration of mandibular patterns reveal...
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John Burns @burnsajohn.bsky.social · 11/11/2024
"The death of an acantharian" Or: why we don't have fossil acantharian skeletons like we do for their glassy and chalky cousins. I think in this case it might somehow be an active process--acantharian skeletons from cells that swarm away last longer.
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Johan Renaudie @plannapus.bsky.social · 30/10/2024
Sarah, Dave and I just got a small piece published in PAGES Magazine on the legacy of IODP in term of evolutionary studies and conservation biology (with radiolarians as case study): doi.org/10.22498/pag...
doi.org
Radiolaria as a study system for marine plankton in a changing climate | PAGES
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Johan Renaudie @plannapus.bsky.social · 29/10/2024
Indeed my first guess would be some sort of pyloniid/tholoniid but i'm intrigued by what we see below in the middle of the specimen (are those arches? could it be some weird little nassellarian, like a trissocyclid). With additional pics showing different focal depths, it could clarify what it is.
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Johan Renaudie @plannapus.bsky.social · 29/10/2024
Do you happen to have pictures of other focal depths?
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Johan Renaudie @plannapus.bsky.social · 09/10/2024
Happy to have collaborated on this with Miguel! A new time-calibrated molecular phylogeny of radiolarians with insights on their hidden diversity 🧪
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Miguel Méndez Sandín @sandinmm.eurosky.social · 09/10/2024
Radiolaria are known for their elaborate and gorgeous skeletons, found all over our oceans. But what if I tell you that half of their diversity might be naked!? www.biorxiv.org/content/10.1...
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Johan Renaudie @plannapus.bsky.social · 14/06/2024
Hi! I'd like to be added to the feed if possible. Thanks! orcid.org/0000-0002-91...
orcid.org
ORCID
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Johan Renaudie @plannapus.bsky.social · 14/06/2024
New article from our student Gabrielle, on Late Eocene paleoproductivity in the Southern Ocean! 🧪 cp.copernicus.org/articles/20/...
cp.copernicus.org
Late Eocene to early Oligocene productivity events in the proto-Southern Ocean and correlation to climate change
Abstract. The Eocene–Oligocene transition (EOT, ca. 40–33 Ma) marks a transformation from a largely ice-free to an icehouse climate mode that is well recorded by oxygen-stable isotopes and sea surface...
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Johan Renaudie @plannapus.bsky.social · 03/01/2024
The result seems more congruent with model expectations (i.e. instead of a sharp increase, a mostly stable history, with a slightly decreasing trend).
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Johan Renaudie @plannapus.bsky.social · 03/01/2024
Our latest study using the Neptune database is out as a preprint. Long story short: we tried to replicate past estimates of global sedimentation rates during the Cenozoic and noticed biases that went previously ignored and tried to correct them. egusphere.copernicus.org/preprints/20...
egusphere.copernicus.org
Cenozoic pelagic accumulation rates and biased sampling of the deep sea record
Abstract. Global weathering is a primary control of the earth's climate over geologic time scales: converting atmospheric pCO2 into dissolved bicarbonate; with carbon sequestration by marine plankton ...
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Wolfgang Kiessling @kiessl.bsky.social · 08/12/2023
The first finely resolved CO2-curve for the last 66 million years. Almost identical to the temperature curve. Little room for other drivers than greenhouse gasses to control Earth's climate. www.science.org/doi/10.1126/...
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Johan Renaudie @plannapus.bsky.social · 22/11/2023
then `getNeptuneData(nsb, fossil_group="R", age_range=c(0,1), ocean="ANT",resolve_syn=TRUE)` to download all antarctic radiolarians from the last Myr for instance or `findAge(nsb, "113_689B", depth_mbsf=c(0,10,100))` to get sample ages (4/4)
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