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Posts by Fredrik Ryderheim

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Postdoctoral Researcher-- Foundations of a Resilient Microbiome (2 Positions) University of California Santa Barbara is hiring. Apply now!

🚨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

6 days ago 11 16 1 0
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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

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/...

1 week ago 3 1 0 0

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

2 weeks ago 32 10 0 0
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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 ...

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/...

2 weeks ago 16 6 0 0
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

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

2 weeks ago 6 3 0 0
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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

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...

3 weeks ago 5 5 0 0

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

3 weeks ago 114 14 5 0

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.

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1 month ago 12 2 2 1
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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...

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!

1 month ago 1 2 0 0
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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...

1 month ago 348 120 7 25

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

1 month ago 19 4 1 0

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...

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2 months ago 15 1 1 0
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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!

2 months ago 3 0 0 1
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Upptäckten: Hundratals döda fiskar i Höje å Lommabon: ”Det är tragiskt.”

www.sydsvenskan.se/lomma/hundra...

2 months ago 0 0 0 0
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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.

2 months ago 0 0 1 0

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...

2 months ago 1 5 1 0
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Happy to see our analysis on scaling up temperature x nutrient interactions from populations to communities published in Ecological Monographs @esajournals.bsky.social! 📈

4 months ago 40 14 1 0

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!

4 months ago 4 6 2 0
Journal of Plankton Research Call for Papers: Advances in Planktonic Harmful Algae Research from Marine and Freshwater Environments. Submit by 15 March 2026.

Journal of Plankton Research Call for Papers: Advances in Planktonic Harmful Algae Research from Marine and Freshwater Environments. Submit by 15 March 2026.

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

5 months ago 2 3 0 0
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.

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.

@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...

7 months ago 27 21 2 2
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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...

📣 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. >>
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#New_Phytologist #Marine_Biology #Viruses

7 months ago 22 12 2 0
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What could be more exciting than watching Euplotes scurry around under the microscope? How about adding some raptorial predation by supergiant cannibal cells?

www.biorxiv.org/content/10.1...

Video by Vittorio Boscaro.

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7 months ago 113 37 3 11
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PhD Scholarship in marine fish habitats in Denmark - DTU Aqua We are looking for a motivated PhD candidate to explore how fish distribution and habitats are linked across coastal and offshore waters in Denmark. The project focuses on improving our understanding ...

#PhD Scholarship in #marine #fish habitats in Denmark

...at DTU Aqua with a very good colleague of mine.
#jobalert

efzu.fa.em2.oraclecloud.com/hcmUI/Candid...

8 months ago 0 1 0 0
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Sequestration by the biological carbon pump: Do we really know what we are talking about? aslopubs.onlinelibrary.wiley.com/doi/10.1002/... #jcampubs 🌊

8 months ago 6 2 0 1
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We have a postdoc opening for a protistologist with biophysics inclinations to join our @hfspo.bsky.social project! (focus will be on characterising the morphology, ultrastructure and behaviour of excavates) #protistsonsky

Apply by Sept 17th (RTs appreciated!)
jobs.exeter.ac.uk/hrpr_webrecr...

8 months ago 47 49 1 0
Nutrient Co-limitation of Marine Microbes: Exploring Cellular to Ecosystem-Level Effects Nutrient availability limits microbial growth in marine ecosystems globally. Accumulating evidence has highlighted the prevalence of nutrient co-limitation, whereby two or more nutrients restrict mari...

🌊Curious how multi-nutrient scarcity impacts marine microbes🦠? Excited to announce our #OSM26 session, Glasgow Feb 22-27! Join us in bridging cell biology, modelling & oceanography! tinyurl.com/zzt5s9su @exetermarine.bsky.social @thembauk.bsky.social @proteocean.bsky.social @cmarkmoore.bsky.social

8 months ago 10 6 0 0

Still debating attendance? Check out the amazing souvenir mugs that our lab technician, Julian Jacobs, has made for the occasion! #TraitBasedApproaches #Traits2025

8 months ago 10 2 1 1
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Seventh Workshop on Trait-based Approaches to Ocean Life The 7th Workshop on Trait-based Approaches to Ocean Life will bring together scientists to discuss how functional traits shape marine ecosystems, using experimental, statistical, and modeling approach...

Trying to develop predictive theory for how biology works in the ocean? Interested in unifying traits? Keen to hang out in a beautiful place with amazing people? Consider joining us in a couple of weeks at the 7th #TraitBasedApproaches workshop in Asilomar! carnegiescience.edu/seventh-trai...

9 months ago 23 12 1 1
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Intraspecific differences in the effects of salinity and light on growth and prymnesin cell quota in Prymnesium parvum The haptophyte Prymnesium parvum produces large polyether compounds (prymnesins) with lytic properties that accumulate in the cell or may be released …

In our study on Prymnesium parvum, we found that low salinity inhibits prymnesin production, while slower growth leads to higher cellular toxin quotas. Intraspecific differences may help explain bloom success across environments.

#openaccess in Harmful Algae

www.sciencedirect.com/science/arti...

9 months ago 3 0 0 0
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Predator-induced defense reduces growth rate and carrying capacity in a toxic diatom, Pseudo-nitzschia seriata Phytoplankton employ a wide variety of defenses to reduce mortality from zooplankton grazing. Many such defenses are inducible, that is, they are upre…

Our latest paper on predator-induced defense is now out in Harmful Algae. We show that Pseudo-nitzschia seriata induced to produce more domoic acid grow slower and, because of increased cellular N, produce less cells as nutrients become depleted.

www.sciencedirect.com/science/arti...

9 months ago 0 0 0 0
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