Fredrik Ryderheim
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fryderheim.bsky.social
Fredrik Ryderheim
@fryderheim.bsky.social
240 followers 140 following 9 posts
Plankton ecologist. Postdoc at the University of Copenhagen.
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fryderheim.bsky.social
Fredrik Ryderheim @fryderheim.bsky.social · Jul 16
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...
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 …
www.sciencedirect.com
Reposted by Fredrik Ryderheim
academic.oup.com
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.
October 24, 2025 at 4:00 PM
Reposted by Fredrik Ryderheim
mridulkthomas.bsky.social
@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.
September 15, 2025 at 11:20 AM
Reposted by Fredrik Ryderheim
vardilab.bsky.social
📣 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
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...
nph.onlinelibrary.wiley.com
September 4, 2025 at 11:03 AM
Reposted by Fredrik Ryderheim
blarson.bsky.social
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.

1/n
August 26, 2025 at 8:56 PM
Reposted by Fredrik Ryderheim
olehenriksen.bsky.social
#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...
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 ...
efzu.fa.em2.oraclecloud.com
August 13, 2025 at 2:18 PM
Reposted by Fredrik Ryderheim
jcamthrash.bsky.social
Sequestration by the biological carbon pump: Do we really know what we are talking about? aslopubs.onlinelibrary.wiley.com/doi/10.1002/... #jcampubs 🌊
August 12, 2025 at 1:10 PM
Reposted by Fredrik Ryderheim
micromotility.bsky.social
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...
August 6, 2025 at 7:19 PM
Reposted by Fredrik Ryderheim
kehelliwell.bsky.social
🌊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
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...
tinyurl.com
July 31, 2025 at 8:34 AM
Reposted by Fredrik Ryderheim
mixotrophe.bsky.social
Still debating attendance? Check out the amazing souvenir mugs that our lab technician, Julian Jacobs, has made for the occasion! #TraitBasedApproaches #Traits2025
July 28, 2025 at 3:31 PM
Reposted by Fredrik Ryderheim
mixotrophe.bsky.social
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...
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...
carnegiescience.edu
July 19, 2025 at 11:15 PM
fryderheim.bsky.social
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...
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 …
www.sciencedirect.com
July 16, 2025 at 11:57 AM
fryderheim.bsky.social
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...
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…
www.sciencedirect.com
July 9, 2025 at 5:45 PM
Reposted by Fredrik Ryderheim
joeybernhardt.bsky.social
✨ The Bernhardt Lab at the University of Guelph is recruiting graduate students for 2026! Join us! We have several fully funded grad positions available ✨

Please spread the word!

www.bernhardtlab.org/join-us

#CSEE2025
A blue poster describing opportunities to join the Bernhardt Lab -- for more information please see https://www.bernhardtlab.org/join-us
July 7, 2025 at 11:21 PM
Reposted by Fredrik Ryderheim
glwheeler2.bsky.social
Are you interested in how diatoms communicate with each other? Exciting post-doc position available in my lab to study the signalling mechanisms of cell-cell communication in diatoms. Deadline 14th July. @kehelliwell.bsky.social @thembauk.bsky.social www.jobs.ac.uk/job/DNO210/p...
July 4, 2025 at 7:18 AM
Reposted by Fredrik Ryderheim
floravincent.bsky.social
Excited to share the lab's 1rst preprint! Rapid high-res immunofluorescence is now possible in cultured & environmental diatoms thanks to 4-fold expansion microscopy. A step-change for comparative cell biology in one of the most important phytoplankton groups on the planet 🥳
tinyurl.com/m9s5su7s 1/2
June 17, 2025 at 7:33 AM
Reposted by Fredrik Ryderheim
microsensing.bsky.social
A modular, open source Scanning Particle Image Velocimetry system for spatial mapping of flow, oxygen concentration and boundary layers around aquatic organisms/samples.
Great collaborative work headed by @pacherres-co.bsky.social

@moorefound.bsky.social @villumscience.bsky.social @MSCActions
pacherres-co.bsky.social César O. Pacherres @pacherres-co.bsky.social · Jun 12
Take a look at our new article where we present a system to spatially map oxygen and flow fields around corals and algae 🪸

besjournals.onlinelibrary.wiley.com/doi/10.1111/...

Thanks to @microsensing.bsky.social @MSCActions @villumscience.bsky.social
June 13, 2025 at 11:02 AM
Reposted by Fredrik Ryderheim
pacherres-co.bsky.social
Take a look at our new article where we present a system to spatially map oxygen and flow fields around corals and algae 🪸

besjournals.onlinelibrary.wiley.com/doi/10.1111/...

Thanks to @microsensing.bsky.social @MSCActions @villumscience.bsky.social
June 12, 2025 at 2:37 PM
Reposted by Fredrik Ryderheim
olehenriksen.bsky.social
Sand is not just sand when you are a #sandeel.
Read about one of our studies that came out last year in JEMBE.
#fish #teamfish
@elsevierconnect.bsky.social

www.aqua.dtu.dk/english/news...
The sandeel's sense of sand
The sandeel plays an important role in the marine ecosystem as a key species in the food chain. Now research shows that sandeels are picky about the sandy bottom where they burrow – and this makes them vulnerable to potential changes to their habitats, which are sand and gravel banks.
www.aqua.dtu.dk
May 16, 2025 at 10:33 AM
Reposted by Fredrik Ryderheim
davidho.bsky.social
The footage of bottom trawling alone makes the film worth watching. Let’s hope this destructive method of killing ocean creatures is outlawed soon.
David Attenborough’s Ocean reveals how bottom trawling is hurting sealife in horrifying detail
Industrial fishing has caused immense damage to ocean life, but given the right protection, the sea has miraculous powers of recovery.
theconversation.com
May 8, 2025 at 9:02 PM
Reposted by Fredrik Ryderheim
brussaard7.bsky.social
Another position within the PHYVIR project 😁.
Are you looking for an interesting Postdoc (45 month!) on marine viral ecology? Check out the ad below.
workingat.nioz.nl/o/postdoc-po...
NIOZ - Postdoc position (45 months):“Marine phytoplankton – virus interactions and loss rates from small to ocean scale”
The Department of Marine Microbiology and Biogeochemistry (MMB; principal investigator and PHYVIR project coordinator Prof. Dr. Corina Brussaard) of NIOZ is looking for a talented and dedicated Postdo
workingat.nioz.nl
May 3, 2025 at 6:40 AM
fryderheim.bsky.social
We wrote a 'quick guide' on the diatom–copepod arms race. Published today in @currentbiology.bsky.social

www.cell.com/current-biol...
The diatom–copepod arms race
Kiørboe and Ryderheim introduce the competitive arms race between copepods and their diatom prey.
www.cell.com
April 21, 2025 at 5:20 PM
Reposted by Fredrik Ryderheim
dumack.bsky.social
🚨 3-year Postdoc Opportunity! Join me and the Aquatic Ecosystem Analysis group @UniKoblenz. 🔬 Microbial #ecology, #protist predation, #algae #plankton & flexibility | 💻 Environmental -omics | 🌊 Rivers 📅 Apply by May 15 | 🔗 kennethdumack.de | tinyurl.com/dumack
Please share! #MicroSky #ProtistsOnSky
April 16, 2025 at 7:46 AM
Reposted by Fredrik Ryderheim
hillebr1.bsky.social
We offer a 5-year research position in the #PlanktonEcology lab in Wilhelmshaven. Are you interested in empirically testing ecological concepts? We offer a stimulating scientific environment, experimental facilities & support to establish an independent research profile
uol.de/en/job/postd...
Postdoctoral researcher in Plankton Ecology // University of Oldenburg
uol.de
April 15, 2025 at 5:59 PM
Reposted by Fredrik Ryderheim
aquaticphyto.bsky.social
Come and talk Baltic Sea nitrogen with us in Uppsala May 13-15, a workshop hosted by the Baltic Sea Nitrogen Cycling Network balticnitrogen.com for registration please visit: www.slu.se/en/ew-calend... listen to talks and mingle around posters, and exchange ideas on what’s needed in the future.
BSNCN
balticnitrogen.com
April 3, 2025 at 4:34 PM
Reposted by Fredrik Ryderheim
hillebr1.bsky.social
@icbm-uol.bsky.social offers a fully funded professorship in theoretical oceanography. Join a great team of physicists, chemists, and biologists working on the marine environment. Oldenburg is a truly livable city and connected to a range of marine institutes in NW Germany

uol.de/en/job/w2-pr...
Professorship in Theoretical Physical Oceanography // University of Oldenburg
uol.de
April 3, 2025 at 5:47 PM