Fredrik Ryderheim

Happy to finally share our preprint: Modelling variation in salinity-dependent growth in photosynthetic microbes, now available on @biorxivpreprint.bsky.social www.biorxiv.org/content/10.6... Special thanks to my co-author @mridulkthomas.bsky.social for guiding me through the modelling jungle 😵‍💫

I’m teaching a free online workshop on Bayesian optimal experimental design on Nov 18th, with @raviranjan.bsky.social . We environmental scientists waste a huge amount of effort on experiments that don't tell us much. Ravi & I want to fix that. Please sign up and share! forms.gle/oatKwoFJCBkc...

Modelling variation in salinity-dependent growth in photosynthetic microbes www.biorxiv.org/content/10.6... #jcampubs

A new preprint by @amirfromm.bsky.social 📣 How do protists fight viruses in nature? Using single-cell sequencing in an isolated alpine lake, we uncover natural giant-virus infections and reveal the induction of viperin, an ancient antiviral defense, in wild protists 🏔️🦠->

Our early career member Aubrey Trapp works on the interactions between predators and paralytic shellfish toxin-producing microalgae. Read more about her research and her latest publication on our website: issha.org/early-career...

Don't miss out! One week left to sign up for the EMBO Workshop "Marine microbial chemical communication" in Den Hoorn (Texel), Netherlands, 15–18 March 2027. Deadline: 20 October 2026 https://meetings.embo.org/event/27-marine-communication #EMBOMarineComms #MarineBiology #EMBOevents 🧪

A fantastic opportunity! #harmfulalgae

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/...

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...

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.

ASLO Meeting Abstract deadline extended until September 21! Consider joining our session on bioluminescence, dinoflagellates, ecotourism, and conservation! #oceanography 🌊

“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.

The new Natural History Museum of Denmark will open March 6, 2027! Very exciting! snm.dk/en/news/open...

febs.onlinelibrary.wiley.com/share/2HMBIS...

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.

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

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...

Integration and regulation of stolen organelles in a marine protist academic.oup.com/ismej/advanc... #jcampubs

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...

PhD position in Marine Microbiology / HABs / B-vitamins at NC State University (USA). #harmfulalgae paerllab.wordpress.ncsu.edu/2026/07/28/p...

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...

Will be interesting to try this out!

Thought-provoking words by Albert Calbet in the latest issue of Journal of Plankton Research. academic.oup.com/plankt/artic...

The coccosphere of the heavy calcifying coccolithophore Coccolithus braarudii provides defense against bacteria www.nature.com/articles/s42... #jcampubs

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...

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...

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 finally made it to BlueSky. If you work on harmful algae, this one's for you 🌊

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.

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...

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...

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...

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.

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.

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.

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

🚨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

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/...

Happy to see our antifragility paper published! With @jonaswickman.bsky.social and @chrisklausmeier.bsky.social.

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/...

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

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...

The ocean does not produce half of the oxygen that we breathe.

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)

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!

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...

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