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Fredrik Ryderheim

@fryderheim.bsky.social
268 followers 160 following 19 posts

Plankton ecologist. Postdoc at The Natural History Museum of Denmark, University of Copenhagen.

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Reposted by Fredrik Ryderheim
International Society for the Study of Harmful Algae (ISSHA) @iss-ha.bsky.social · 3h
A fantastic opportunity! #harmfulalgae
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Fredrik Ryderheim @fryderheim.bsky.social · 10h
Aubrey Trapp et al adds further evidence that top-down effects need to be considered in harmful algal bloom forecasting. www.pnas.org/doi/10.1073/...
pnas.org
Passive sampling for grazer cues incorporates top-down effects in harmful algal bloom monitoring and toxin prediction | PNAS
Domoic acid (DA) produced by toxigenic species of the diatom genus Pseudo-nitzschia during harmful algal blooms (HABs) bioaccumulates in filter fee...
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Reposted by Fredrik Ryderheim
International Society for the Study of Harmful Algae (ISSHA) @iss-ha.bsky.social · 16h
The ERC BLOOMTOX Symposium: Impacts of global change on harmful cyanobacteria across scales will take place on 11 November 2026 at the Netherlands Institute of Ecology (NIOO-KNAW) in Wageningen, the Netherlands. Attendance is free (on-site and online). Registration: nioo.knaw.nl/en/form/glob...
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Reposted by Fredrik Ryderheim
Ken H Andersen @kenandersen.bsky.social · 23/09/2026
Introducing the NUM model version 1.0 (github.com/Kenhasteande...): a validated plankton community model designed for global plankton ecology on a laptop. No more phyto/zooplankton but a modern description of mixotrophs and multicellular plankton.
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Reposted by Fredrik Ryderheim
Maggi Brisbin @margaretbrisbin.bsky.social · 15/09/2026
ASLO Meeting Abstract deadline extended until September 21! Consider joining our session on bioluminescence, dinoflagellates, ecotourism, and conservation! #oceanography 🌊
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Colin Kremer @quant-ecology.bsky.social · 03/09/2026
“Cool” new NSF postdoc position available in my lab at UConn, studying our unique Arctic phytoplankton collection and the interactive effects of temperature, light, and photoperiod. 3 years of funding, detailed job ad here: s.uconn.edu/q1o0itl62l.
Picture of centric Arctic diatom
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Fredrik Ryderheim @fryderheim.bsky.social · 02/09/2026
The new Natural History Museum of Denmark will open March 6, 2027! Very exciting! snm.dk/en/news/open...
snm.dk
The Opening Date Has Been Set For Denmark's New Natural History Museum
March 6, 2027, one of Denmark’s largest museum investments in recent decades will be completed when Natural History Museum Denmark opens its doors to the new national museum of natural history in the ...
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Reposted by Fredrik Ryderheim
John Dolan @tintinnman.bsky.social · 02/09/2026
febs.onlinelibrary.wiley.com/share/2HMBIS...
febs.onlinelibrary.wiley.com
Stop paying predatory publishers of academic journals—A policy proposal to restore scientific integrity and transparency
Reader environment loaded
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Reposted by Fredrik Ryderheim
Corey Holt @coreyholt.bsky.social · 27/08/2026
What's that? You wish we had more data on those bizarre dinoflagellates WITH EYES? Have no fear! With @protistwtmostest.bsky.social, Gordon Lax, and @pjkeelinglab.bsky.social, who also have eyes.
academic.oup.com
Evolution of complex organelles in ocelloid-bearing dinoflagellates
Abstract. Warnowiid dinoflagellates are known for possessing two of the most complex structures known in single cells: multi-projectile nematocysts and the
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Reposted by Fredrik Ryderheim
ReDiLEEP @redileep.bsky.social · 26/08/2026
Meet ReDiLEEP – a new Marie Skłodowska-Curie Actions Doctoral Network! We bring together 13 doctoral researchers to explore response diversity – how different responses to environmental change can make ecosystems more resilient. Recruitment is now underway! redileep.eu
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Reposted by Fredrik Ryderheim
International Society for the Study of Harmful Algae (ISSHA) @iss-ha.bsky.social · 19/08/2026
Our early career member Carolin Peter studies the toxic cyanobacteria Nodularia spumigena in the Baltic Sea. She is also the student representative on the ISSHA council. Read more about her work on our website: issha.org/early-career...
issha.org
Early career reseracher highlight: Carolin Peter : International Society for the Study of Harmful Algae (ISSHA)
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Reposted by Fredrik Ryderheim
Cameron Thrash @jcamthrash.bsky.social · 05/08/2026
Integration and regulation of stolen organelles in a marine protist academic.oup.com/ismej/advanc... #jcampubs
academic.oup.com
Integration and regulation of stolen organelles in a marine protist
Abstract. Chloroplast-stealing (a.k.a., “kleptoplastidic”) plankton transiently obtain and integrate prey metabolic machinery into their own cells. To do s
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Reposted by Fredrik Ryderheim
International Society for the Study of Harmful Algae (ISSHA) @iss-ha.bsky.social · 04/08/2026
PhD position in understanding benthic marine cyanobacterial blooms and toxin production at the Cawthorn Institute (NZ). Deadline August 16 careers.cawthron.org.nz/job/b58073c7...
careers.cawthron.org.nz
PhD Position - Understanding Benthic Marine Cyanobacterial Blooms and Toxin Production - Cawthron Institute - Cawthron Institute
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Reposted by Fredrik Ryderheim
International Society for the Study of Harmful Algae (ISSHA) @iss-ha.bsky.social · 04/08/2026
PhD position in Marine Microbiology / HABs / B-vitamins at NC State University (USA). #harmfulalgae paerllab.wordpress.ncsu.edu/2026/07/28/p...
paerllab.wordpress.ncsu.edu
PhD position available; Marine Microbiology / HABs / B-vitamins – Paerl Lab @ NCSU
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Reposted by Fredrik Ryderheim
Thomas Mock @thomasmock.bsky.social · 28/07/2026
Our new MSCA-Doctoral Network project ML4Plankton will kick off soon. 14 PhD students will start in March 2027 to work on plankton big data, i.e., machine learning. Get in touch if you are interested. Coordinator: Sakina-Dorothée Ayata @norwichmicro.bsky.social www.normalesup.org/~ayata/DN_ML...
normalesup.org
ML4Plankton Doctoral Network
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Fredrik Ryderheim @fryderheim.bsky.social · 06/07/2026
Will be interesting to try this out!
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Fredrik Ryderheim @fryderheim.bsky.social · 06/07/2026
Thought-provoking words by Albert Calbet in the latest issue of Journal of Plankton Research. academic.oup.com/plankt/artic...
academic.oup.com
If AI writes the paper, who validates the plankton?: a call to reinvest in empirical expertise before the validation gap becomes irreversible
Abstract. Artificial intelligence is already reshaping the production of scientific text, literature synthesis, coding and image-based biological analysis.
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Reposted by Fredrik Ryderheim
Cameron Thrash @jcamthrash.bsky.social · 03/07/2026
The coccosphere of the heavy calcifying coccolithophore Coccolithus braarudii provides defense against bacteria www.nature.com/articles/s42... #jcampubs
nature.com
The coccosphere of the heavy calcifying coccolithophore Coccolithus braarudii provides defense against bacteria - Communications Biology
Decalcified cells of the coccolithophore Coccolithus braarudii collapse iupon exposure to P. inhibens, whereas calcified cells remain unaffected. This study provides the first direct evidence of the e...
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Reposted by Fredrik Ryderheim
International Society for the Study of Harmful Algae (ISSHA) @iss-ha.bsky.social · 01/07/2026
ISSHA early career member Manuela Seehauser, PhD student at Swedish University of Agricultural Sciences, researches toxic cyanobacterial blooms in the Baltic Sea. Read more about her research on our website 🌊👩‍🔬 #harmfulalgae #cyanobacteria issha.org/early-career...
issha.org
Early career reseracher highlight: Manuela Seehauser : International Society for the Study of Harmful Algae (ISSHA)
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Reposted by Fredrik Ryderheim
International Society for the Study of Harmful Algae (ISSHA) @iss-ha.bsky.social · 26/06/2026
Nominate a fellow ISSHA member for the "HAB Trailblazer" award! The award recognizes an individual who has made inspiring contributions to HAB research. issha.org/call-for-nom...
issha.org
Call for nominations: 2026 HAB Trailblazers : International Society for the Study of Harmful Algae (ISSHA)
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Reposted by Fredrik Ryderheim
International Society for the Study of Harmful Algae (ISSHA) @iss-ha.bsky.social · 18/06/2026
We're running a series where we highlight the research of our early career members. First up was Arnaud Louchart from @niooknaw.bsky.social discussing his recent work on #Microcystis cyanobacteria issha.org/early-career...
issha.org
Early career researcher highlight: Arnaud Louchart : International Society for the Study of Harmful Algae (ISSHA)
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Fredrik Ryderheim @fryderheim.bsky.social · 16/06/2026
ISSHA finally made it to BlueSky. If you work on harmful algae, this one's for you 🌊
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Elena Litchman @elenalitchman.bsky.social · 10/06/2026
Happy to see our new paper led by @marangureng.bsky.social on metabolic signatures of high temperature adaptation in diatoms published! 🎉 In collaboration with @suleles.bsky.social, Angel Diz, María Huete-Ortega, Andy Allen and Naomi Levine.
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Reposted by Fredrik Ryderheim
César O. Pacherres @pacherres-co.bsky.social · 27/05/2026
Coral reefs are increasingly threaten by marine heatwaves, but what pushes corals past their breaking point? New in @ScienceAdvances @science.org: we found that corals can lose the microscopic system that helps move oxygen around their tissues during heat stress 🪸 doi.org/10.1126/scia...
doi.org
Acute temperature effects on cilia beating increase coral deoxygenation
Ciliary flows buffer coral O2 supply under heat stress until a tipping point, above which hypoxia and tissue failure are induced.
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Reposted by Fredrik Ryderheim
Andrew Alverson @sinkingdiatom.bsky.social · 28/05/2026
I'm looking for a postdoc to work on diatom phylogenomics. Reach out by email with questions. Please share and repost! uasys.wd5.myworkdayjobs.com/UASYS/job/Fa...
uasys.wd5.myworkdayjobs.com
Postdoctoral Fellow in Biological Sciences
Current University of Arkansas System employees, including student employees and graduate assistants, need to log in to Workday via MyApps.Microsoft.com, then access Find Jobs from the Workday search ...
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Reposted by Fredrik Ryderheim
Ben Larson @blarson.bsky.social · 19/05/2026
And now it's out! Happy that PNAS selected for the cover this SEM image snapped by @samjlord.bsky.social, one of the most evocative visualizations of Euplotes that I have ever encountered. www.pnas.org/doi/10.1073/... Stay tuned for what is shaping up to be some fascinating follow-up in the lab...
Scanning electron microscopy image of the ciliate Euplotes gigatrox on the cover of the journal PNAS. Distinct punk rock vibes
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Ole Henriksen @olehenriksen.bsky.social · 01/05/2026
Some time ago, I wnt on a casual trip to Frøya, Norway. It turned out to be a bit more than just a fun observation… The scientific paper is now out 👉 onlinelibrary.wiley.com/doi/full/10.... Small observations can sometimes open up new questions.
lnkd.in
LinkedIn
This link will take you to a page that’s not on LinkedIn
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Mridul K. Thomas @mridulkthomas.bsky.social · 27/04/2026
We need more long-format journals. Brevity is good. But there are topics that would benefit from more space than tight word limits allow. And there's a cost to summarising methods or shunting them to appendices. For science to be reproducible, we need to be able to clearly describe what was done.
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Mridul K. Thomas @mridulkthomas.bsky.social · 24/04/2026
Claude seems fantastic at writing Shiny apps. You can in principle go from knowing nothing about how to create one to having one online in minutes (obviously, best to spent more time checking it!). Fabulous for sharing ideas quickly and an excellent accompaniment to papers and lectures.
Screenshot of a Shiny app for simulating data from two different experimental designs, fitting them using Bayesian methods, and comparing the posteriors.
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Reposted by Fredrik Ryderheim
Woods Hole Oceanographic Institution @whoi.edu · 21/04/2026
71% of our planet is ocean, but you wouldn’t know it from traditional maps. Shift your land-based perspective this Earth Week with a story about the Spilhaus Projection map and the WHOI oceanographer who created it: go.whoi.edu/spilhausmap
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Holly Moeller @mixotrophe.bsky.social · 15/04/2026
🚨Job Alert!🚨 Please share widely! We are hiring *two* postdocs (one ASAP, one Oct '26) using models and data to identify pathways involving the gut-brain axis that link the infant microbiome with neurodevelopment and Autism Spectrum Disorder. 1st review date: April 24! recruit.ap.ucsb.edu/JPF03089
recruit.ap.ucsb.edu
Postdoctoral Researcher-- Foundations of a Resilient Microbiome (2 Positions)
University of California Santa Barbara is hiring. Apply now!
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Fredrik Ryderheim @fryderheim.bsky.social · 14/04/2026
The Selander Lab at Lund University, Sweden, is looking for a PhD student to study the ecology of fear in marine plankton. Exciting topic with great supervision! lu.varbi.com/en/what:job/...
lu.varbi.com
Doctoral student in biology
Subject description Biology is the broad subject of all living things. It encompasses everything from processes at the molecular and cellular levels to global processes at the ecosystem level. The sub
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Reposted by Fredrik Ryderheim
Elena Litchman @elenalitchman.bsky.social · 31/03/2026
Happy to see our antifragility paper published! With @jonaswickman.bsky.social and @chrisklausmeier.bsky.social.
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Fredrik Ryderheim @fryderheim.bsky.social · 06/04/2026
Our review on the evolutionary arms race between copepods and diatoms is now published in @aslo.org #ASLO_LO 🌊 We discuss the most common defense mechanisms found in diatoms, and how copepods have evolved to overcome them. Check it out #openaccess aslopubs.onlinelibrary.wiley.com/doi/10.1002/...
aslopubs.onlinelibrary.wiley.com
Diatoms–copepods: An evolutionary arms race
Diatoms and copepods are dominating and diverse groups of phytoplankton and zooplankton, respectively. Diatoms account for 25–40% of ocean primary production, and their main predators, copepods, are ...
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Andrew Alverson @sinkingdiatom.bsky.social · 31/03/2026
Somehow this paper has been largely ignored, but the basic idea has been presented by others as novel, or the idea gets misattributed to someone else. If you're interested in #diatom sex and its evolutionary importance, read and cite this paper. www.jstor.org/stable/2460887
jstor.org
The Diatom Sex Clock and Its Evolutionary Significance on JSTOR
William M. Lewis, Jr., The Diatom Sex Clock and Its Evolutionary Significance, The American Naturalist, Vol. 123, No. 1 (Jan., 1984), pp. 73-80
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Rense Nieuwenhuis @rnieuwenhuis.bsky.social · 29/03/2026
High childhood poverty in Sweden, but disproportionally among parents with a migration background. Important research and debate piece by Anna Tegunimataka, @siddarthaaradhya.bsky.social and @rafgrotti.bsky.social www.aftonbladet.se/debatt/a/K88...
aftonbladet.se
Stora ojämlikheter i hur svenska barn växer upp
DEBATT. I tider av hög arbetslöshet och ökade matpriser riskerar många familjer att drabbas av ekonomisk utsatthet. Men barnfattigdomen i Sverige är kraftigt oj
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David Ho @davidho.bsky.social · 29/03/2026
The ocean does not produce half of the oxygen that we breathe.
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Mridul K. Thomas @mridulkthomas.bsky.social · 20/03/2026
Paul Ehrlich is remembered for a bet that he lost, and a population prediction that went wrong. Many environmental scientists seem to remember him warmly for 'raising awareness'. They should not. His legacy is both stupid and vile beyond imagination. (1)
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Ken H Andersen @kenandersen.bsky.social · 12/03/2026
The flyver for this year's AMARE PhD school in lovely Malta is up: www.ogs.it/en/amare-med.... I look forward to present the new developments of FEISTY, and Andre Punt will introduce size-based stock assessment methods. Note: deadline coming up soon!
ogs.it
AMARE-MED 2026 | OGS | Istituto Nazionale di Oceanografia e di Geofisica Sperimentale
The Advanced school on Multispecies modelling Approaches for ecosystem-based marine REsource management in the MEDiterranean Sea (AMARE-MED) takes place annually and moves around the Mediterranean. Si...
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Schmidt Ocean Institute @schmidtocean.bsky.social · 10/03/2026
Wow. Foraminifera! ROV pilots paused and carefully zoomed in to collect footage of these single-celled microorganisms, or protists, at 843 m during the #OBVI #LivingBioreactors expedition w/ @schmidtsciences.bsky.social offshore of Argentina. Read the full caption: youtube.com/shorts/Yv_ud...
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Mridul K. Thomas @mridulkthomas.bsky.social · 22/02/2026
How does salinity affect growth? @fryderheim.bsky.social & I developed a model to describe this, and he's parameterised it for >100 species. We can now model how salinity changes should affect population & community dynamics! Check out his poster on Monday afternoon at #OSM26
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Mridul K. Thomas @mridulkthomas.bsky.social · 20/02/2026
New preprint out! 🌊🧪🌎 🧮➕📏 Temperature preferences estimated from lab experiments and species distribution models agree reasonably well! This increases my confidence in our ability to forecast range shifts. www.biorxiv.org/content/10.6... 1/n
biorxiv.org
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Fredrik Ryderheim @fryderheim.bsky.social · 20/02/2026
Next week at #OSM26, I’ll be sharing our (w/ @mridulkthomas.bsky.social) work on a new approach for describing how phytoplankton growth responds to salinity, using a large set of experiments to estimate key traits across species. See you at poster OB14B-0481 on Monday!
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Fredrik Ryderheim @fryderheim.bsky.social · 14/02/2026
First time doing field work in 8 years 😵‍💫 Local newspaper reported lots of dead fish floating around Lomma harbor. Lack of oxygen is the likely explanation, but is it the cold weather/stagnant water or perhaps something microscopic? Looking forward to analyzing samples next week in the lab.
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Colin Kremer @quant-ecology.bsky.social · 23/01/2026
Phytoplankton empiricists: anyone have a good protocol (or reference) for treating fungal contamination in stock cultures without re-isolating? 2026 continues bringing all the icks...
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Elena Litchman @elenalitchman.bsky.social · 09/12/2025
Happy to see our analysis on scaling up temperature x nutrient interactions from populations to communities published in Ecological Monographs @esajournals.bsky.social! 📈
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Maggi Brisbin @margaretbrisbin.bsky.social · 26/11/2025
Hey #microbialsky - anyone looking for a good PhD student this cycle? Ugrad from my lab is looking but no luck with the PIs she has contacted (no funding, no response). She worked in my lab for 1.5 years, now is a research tech at the FWC research institute. Excellent at the bench & super smart!
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Oxford Academic @academic.oup.com · 24/10/2025
Has ICHA 2025 left you inspired? Journal of Plankton Research is seeking submissions for an upcoming special issue exploring harmful algae dynamics in both marine and freshwater systems. Submit your next paper with us: oxford.ly/48FyrpP
Journal of Plankton Research Call for Papers: Advances in Planktonic Harmful Algae Research from Marine and Freshwater Environments. Submit by 15 March 2026.
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Mridul K. Thomas @mridulkthomas.bsky.social · 15/09/2025
@raviranjan.bsky.social & I are teaching a free online workshop with on experimental design for environmental scientists on the 23rd. We'll focus on using simulations to evaluate how well different experimental designs help achieve your goals. Please sign up & share! forms.gle/MZTxeQs4UpMr...
Poster for 90 minute workshop on HOW TO DESIGN BETTER EXPERIMENTS, by Mridul Thomas & Ravi Ranjan. 

Details: September 23rd 16:00 CEST ; 14:00 UTC

Description: 

Experimental designs can make or break an experiment. A good experiment has a clear goal and efficiently uses experimental resources to achieve that goal. In this workshop, we will review what experiments are for, basic and advanced principles of designing experiments, and how to use simulations to evaluate designs before actually doing the
experiment. We’ll do a moderate amount of coding in R and so experience with this would be helpful but is not required. We intend to have small-group discussions to help participants develop their own experiments, and encourage participants to think of a specific question they would like to answer with an experiment.
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Vardilab @vardilab.bsky.social · 04/09/2025
📣 We are excited to share our latest paper, led by @taliashaler.bsky.social! We explore the transcriptional basis of #microalgae resistance to #viral_infection and identified a core group of resistance-related genes. >> (1/3) #New_Phytologist #Marine_Biology #Viruses
nph.onlinelibrary.wiley.com
Mapping the transcriptional landscape of algal resistance to viral infection reveals a core expression program
Algal blooms and their demise by viruses drive global-scale ecological processes in the ocean. These blooms form the foundation of marine food webs, regulate microbial communities, and shape biogeoc...
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