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Ruben Cousins-Westerberg

@rucouwes.bsky.social
124 followers 160 following 45 posts

Evolutionary ecologist, doing a PhD on phylogenetics and evolution of sex-determination in the Hawaiʻian Wikstroemia genus of flowering plants 🌿 At Lund University, Sweden. Ever disappointed in the non-existence of dragons 🐉🐉🐉 He/him/they/them ~ 🏳️‍🌈🏳️‍⚧️

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Ruben Cousins-Westerberg @rucouwes.bsky.social · 30/08/2026
Magnetic rack size plays havoc on my usual centrifuge-dependent batch size of 12, 24, 36, 48 etc. samples. Factor of 16? Preposterous!
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 30/08/2026
Counting is hard (I'm no computational biologist... or am I?) but I reckon yesterday brings me, beyond any shadow of a doubt, above 1000 DNA extractions in my life. So far. First time trying a bead and magnet based protocol though, so let's not pretend there is no excitement left to have...
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
And, at the end of the day, the concept I felt most sorely lacking: L'art pour l'art. What about simply doing good systematics, good science, for the joy? Do we NEED to do taxonomy, or do we WANT to do taxonomy? Because if the answer is the latter maybe we shouldn't let the robots do it for us.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
Indeed, it seems to me young systematists are afraid for their future because of the very technology embraced by old systematists to increase their own productivity.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
Many established sytematists seem keen to embrace AI. Their's is a world with too much to do and too little time. However, in young systematists' meetings the discussions on challenges and the future always come back to the question of whether AI will make taxonomists obsolete. There is fear there.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
How do we keep the technofascism, imperialism and inherent biases (colonial, sexist, racist) of the major LLMs out of our science? Not saying it cannot be done, many small AI tools are different from the giants, but should we not detail this BEFORE we conclude LLMs must be the future of taxonomics?
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
To finish taxonomy, to finally describe all organisms through automation (its realism or lack thereof notwithstanding), sounds bleak. I rejoice in new species discoveries and their inherent human joy. The idea of The Final Taxon, described silently unto a cloud by an AI agent, only makes me sad.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
Very basic question: why increase productivity? Do we need to describe species faster? As is so often noted, we already know how to protect species: protect ecosystems. Do we really need to "ramp up production" of species labels?
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
Thoughts on the #BioSystEU2026 panel discussion on increasing productivity in biodiversity research, particularly regarding the discussions about the use of AI to do it, from a lowly PhD student and systematics enthusiast:
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
Favourite keynote was @sandyknapp.bsky.social, talking about those 80 or so beastly huge plant genera, and particularly about Solanum. Had me hungry for tomatoes...
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/08/2026
Had a tremendous time at #BioSystEU2026 in Uppsala! So many great talks and posters, so many friends old and new! Already can't wait for #BioSystEu2030 in Paris!
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BioSyst.EU 2026 @biosysteu2026.bsky.social · 18/08/2026
The BioSyst.EU 2026 Conference is in full swing! Here are some pictures from Day 1. Students and were busy setting up their posters for the presentations, and we got to hear from our first keynote speaker, Fredrik Ronquist! #BIOSYSTEU2026
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Society for Molecular Biology and Evolution @official-smbe.bsky.social · 02/07/2026
Just one more talk, please? ☝️ #SMBE2026 in Copenhagen concludes. It's been an amazing week - with the largest ever attendance at an SMBE meeting! #society
SMBE 2026 closing ceremonySMBE 2026 closing ceremony
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 02/07/2026
A great pleasure to present a little glimpse of our research to the Ancient Plant DNA audience at #SMBE2026 Now I just need to watch the video properly and see what I actually said!
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 13/06/2026
Coming to SMBE? Interested in plants and/or genomics? Come along to this symposium!
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 07/06/2026
Fieldwork in some of the roughest terrains and with some of the prettiest views. Permit struggles notwithstanding, Maui island treated us well.
Climbing through the montane rainforest of East MauiSometimes the general opinion is that things certainly could be worse.

That being said, my legs where dripping blood after trekking through this environment.A male flower, on the backdrop of Kanaio NAR and distant Kaho'olawe.The most (only?) flattering picture of me repeatedly climbing up to various plants on this wall
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 27/05/2026
If I have to log into the cluster, let me do it from here ⛰️🌴
The view from Kihei towards cloud-shrouded Haleakalā makes a nice backdrop for some bioinformatic coding
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 16/05/2026
Searching for Wikstroemia spp. in the mountains of Kauai, sampling for systematics, popgen, and the genetics of sex-determination 🌿
Waimea Canyon, aka "The Grand Canyon of the Pacific"Waimea Canyon againFlowers from a plant that is either hermaphrodite or cryptically female (can't remember off the top of my head, and it is not fully visible in the picture).Wikstroemia palustris (probably), photographed against the rare Alakai sun.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 30/04/2026
If you've had spam, rice, and seaweed you can imagine. As I say in the alt text: it is a marriage of Japanese and American culinary sensibilities, and thus it seems a fitting street food for modern Hawai'i.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 29/04/2026
Common Myna. Called Manu 'Ai Pilau or Piha'ekelu in 'Ōlelo Hawai'i (the Hawaiian language). The former means "bird that eats rotten things", the second means "full of sound". Both seem appropriate.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 28/04/2026
Back in Honolulu, gearing up for fieldwork on Kaua'i and the Maui Nui islands. Doesn't look like hard work you say? Well... you may be right. Hopefully it is coming, with all the permits in place, next week!
"Surfer on a Wave", a scultpure on Kapiolani Park Beach, hung with many lei and with a Myna bird on the top of his head. The Common Myna is called  Manu 'Ai Pilau or Piha'ekelu in 'Ōlelo Hawai'i. The former means "bird that eats rotten things", the second means "full of sound". Both seem appropriate.The view east along Kapiolani Park Beach. The time is about half past nine in the morning, and the first people are out to sun, swim, and surf.The spam musubi is the (quite odd) national snack of Hawai'i. On islands where hotdog sightings are few and far between, these things are available in every store. A marriage of Japanese and American culinary sensibilities, it is perhaps a fitting street food for modern Hawai'i.The Mō'ili'ili neighbourhood of Honolulu, stretching away toward Mānoa valley in the distance. The view captured from my hotel window yesterday morning.
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Derek Hennen, Ph.D. @derekhennen.bsky.social · 03/03/2026
Good article, but the framing is wrong. There is not a dearth of interest in taxonomy. There is a scarcity of funding and positions, which is a deliberate choice by funding agencies and institutions. The youth love taxonomy! It's the olds that are failing to meet their passion!
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Mel Andrews @bayesianboy.bsky.social · 30/01/2026
A new study from Anthropic finds that gains in coding efficiency when relying on AI assistance did did not meet statistical significance; AI use noticeably degraded programmers’ understanding of what they were doing. Incredible.
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Dep. of Ecology, Environment & Plant Sciences at SU @deepsthlmuni.bsky.social · 21/01/2026
The Department of Ecology, Environment and Plant Sciences at @stockholm-uni.bsky.social has two open PhD positions, help us spread the word! 📣 We are looking for a PhD student in Lichen Biology, and one in Ecology & Evolution. Find more information and apply by 1 February below!
su.se
Work with us - Stockholms universitet
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 19/01/2026
Wikipedia celebrates 25 years this year! Sending some love today to (arguably) the best source of knowledge in the world. From dial-up days to now, travel through Wikipedia's history. wikipedia25.org/en/twenty-fi...
wikipedia25.org
25 years of Wikipedia
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 16/01/2026
"Quick and easy" roadmap to finished paper. If I do two things per week I'll be done in no time... It's fine if I don't do anything else the coming three months, right?
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Richard Sever @richardsever.bsky.social · 15/01/2026
One of my concerns with AI-assisted research in biology is that we're already looking only in the lamplight and AI incentivizes us to narrow the beam. Seems like it's happening... www.nature.com/articles/s41...
nature.com
Artificial intelligence tools expand scientists’ impact but contract science’s focus - Nature
Artificial intelligence boosts individual scientists’ output, citations and career progression, but collectively narrows research diversity and reduces collaboration, concentrating work in data-rich a...
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 09/01/2026
My co-conspirator and fellow PhD student Lila writes for The Conversation about how plants have separate sexes, sometimes. Ever wondered something about plant sexual systems? How to start learning about it? I'd say start with this.
theconversation.com
Plant sex life is more complicated than you probably imagine
The amazing variety of plant reproductive systems.
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International Journal of Plant Sciences @ijpsjournal.bsky.social · 16/12/2025
Folks, this can compromise the confidentiality of the review process, as well as authors’ intellectual property rights. Doing it is a breach of peer review ethics.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 23/10/2025
"Phylophytobiogeography" I type. I hesitate... is there no way I can be a bit more... specific? #academicenglish
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Dep. of Ecology, Environment & Plant Sciences at SU @deepsthlmuni.bsky.social · 25/09/2025
We’re hiring! 📣 DEEP at @stockholm-uni.bsky.social is looking for a tenured Associate Professor in Plant Ecology. Join a vibrant research & teaching community in the heart of Sweden’s capital. Learn more and apply below by 16 Nov.👇
su.se
DEEP seeks Associate Professor in Plant Ecology – apply now! - Department of Ecology, Environment and Plant Sciences
DEEP seeks Associate Professor in Plant Ecology – apply now! - Department of Ecology, Environment and Plant Sciences
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Kew Gardens @rbgkew.bsky.social · 02/10/2025
Botanist or poet? For National Poetry Day, we discovered poetry hidden amongst the personal papers of botanists - from J. Fraser’s 1919 poem on poppies to H.M Ward’s critique’s on his mother’s poetry! #KewLA
Close up of letter from H.M. Ward to his mother, reading: ‘July 20: I have just got the second batch of your poems. I strongly advise you to be careful, the ideas are…& poetical to a degree; but you…too apt to lose the on the metre on you…in technical construction. Handwritten poem by J Fraser, titled ‘The Corn Poppy’ with a sentence crossed out then four stanzas reading:
“The scarlet poppy reddens daily, Amongst the cornfields blossoms gaily, Makes comely neighbours wanton palely, and dazzles all beneath the skies, But beckons me with swanting [sic] eyes.
Uh! Could I like the gliding swallow, Explore the vale and upland follows, No more in smoky dens I’d swallow, No longer breathe the air that falls Midst crowded streets and staring walls. 
Then would I bid adieu to collow, And scour the…height and hollow, Un…the downs and blithely follow, along the fields where bright corn rose – The glorious flaming poppy – glows.
To-day would have no room for sorrow, No boding thoughts to gloom to-morrow, And each day after fair would borrow Another glide along the plain, to search amongst the bended grain’”Loose papers, with handwritten poem on top of five stanzas, the second of which is crossed out then rewritten underneath. It reads:
“The transport bent by wholesome breezes, Where charming guise of landscape pleases, Brings life amend, as man can…., and genders thanks for flow’r so fair, That smile and make my errand there. 
I love to see the wild bee settle, Upon the smooth and silky petal, And laugh to view its ardent mettle, When tumbling round the…flow’r, Collecting bee bread hour by hour. 
The longest day draws with gloaming, And puts an end to handsome roaming; I grieve to mark its shadows coming, But more to think when day is blind, that I must leave my flow’r behind. 
The corn, the poppy, bee and ether, And birds that wing on airy feather, all choose the wilds and hang together, Beneath the great and blue sky-dome, And I must visit them at home”
Signed at end:  J.F., March 15th 1919
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 17/09/2025
If that sounds appealing, or if you simply hope to see more pictures from Hawai'i: stick around. There will be more of all this later ~ 🌿
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 17/09/2025
I am also constructing a phylogeny of the wider Wikstroemia genus, hoping to 1. Determine the within genus relationships of the clades, 2. Assess the validity of the many widespread and overlapping, seemingly cryptic species, and 3. Biogeographically analyse how the Wikstroemia dispersed to Hawai'i.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 17/09/2025
My job is to suss out how the Hawai'ian Wikstroemia species are related, how they spread across the islands, what their population structure is like across various habitats, and how the gene trees of the sex-determining regions line up with the evolutionary history of the taxa we recognise today.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 17/09/2025
We investigate these emergent sexual systems through field sampling, greenhouse crosses, hybridisation trials, GWAS, and various other genomic methods for identifying sex chromosomes. However, we also use phylogenetics, biogeographic analyses, and population genetics. This is where I come in.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 17/09/2025
Since the Wikstroemia colonised Hawai'i less than 10 mya, several lineages have (seemingly independently) made the transition from ancestral hermaphroditism to dioecy. This makes these plants a perfect system for study of recent evolution of sex – a subject we still know surprisingly little about.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 17/09/2025
In Hawai'i we find a dozen endemic species of the Wikstroemia genus of flowering plants. Traditionally, native Hawaiians used the tough bark to make cordage, the red berries to decorate lei, and the pulped flesh to make a fish-stunning toxin to be dropped into tide pools.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 17/09/2025
Hello all new followers! Writing "Hi, I'm Ruben" feels redundant and uninteresting given that it says so on my profile already. To introduce myself, I will instead introduce my study system and project. And to do this, I will post 16 images from 16 days of Hawai'i island fieldwork.
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Lisandro Milocco @milocco.bsky.social · 25/08/2025
🚨 We're hiring! PhD position in Evolutionary Systems Biology at Stockholm University & SciLifeLab 🎓 Focus: evolution, development, computational & mathematical modeling, prediction 📍 Stockholm, Sweden 🕒 4 years, fully-funded 🔍 Details: su.varbi.com/en/what:job/... Please share!
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 23/08/2025
Come work in our division!
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Craig Primmer @fishcongen.bsky.social · 22/08/2025
Aurelien Tellier presenting the details of #eseb2027 which will be a hub meeting, with connected and local sessions in 4 hubs (Gothenburg, Munich, London, Istanbul) eseb2027.org #eseb2025
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Giulia Scarparo @giuliascarparo.bsky.social · 22/08/2025
Thanks to Sofia and May Sheday for the courageous and inspiring talks! The scientific world cannot remain silent @eseb2025.bsky.social #ESEB2025 #inclusivity 🏳️‍🌈 #transrights 🏳️‍⚧️ #freepalestine 🇵🇸
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 21/08/2025
Including a full house of evolutionary biologists!
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 21/08/2025
Festa de Gràcia!
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Aaron Kiggen @aaronkiggen.bsky.social · 19/08/2025
The follow-up in ESEB Barcelona! :)
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 21/08/2025
Great first three days of ESEB @eseb2025.bsky.social Many great talks, many great posters, lots and lots of great evolutionary biology. Also many new followers! I will post a proper introduction once the conference is over, but for now: hello!
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Yeet Kune Do @yeetkunedo.bsky.social · 06/07/2025
re: generative AI I have finally fully and accurately explained my problem with how it’s marketed and used. And now, you can use it, too.
Generative Al is being marketed as a tool designed to reduce or eliminate the need for developed, cognitive skillsets. It uses the work of others to simulate human output, except that it lacks grasp of nuance, contains grievous errors, and ultimately serves the goal of human beings being neurologically weaker due to the promise of the machine being better equipped than the humans using it would ever exert the effort to be.

The people that use generative Al for art have no interest in being an artist; they simply want product to consume and forget about when the next piece of product goes by their eyes. The people that use generative Al to make music have no interest in being a musician; they simply want a machine to make them something to listen to until they get bored and want the machine to make some other disposable slop for them to pass the time with.

The people that use generative Al to write things for them have no interest in writing. The people that use generative Al to find factoids have no interest in actual facts. The people that use generative Al to socialize have no interest in actual socialization.

In every case, they've handed over the cognitive load of developing a necessary, creative human skillset to a machine that promises to ease the sweat equity cost of struggle. Using generative Al is like asking a machine to lift weights on your behalf and then calling yourself a bodybuilder when it's done with the reps. You build nothing in terms of muscle, you are not stronger, you are not faster, you are not in better shape. 

You're just deluding yourself while experiencing a slow decline due to self-inflicted atrophy.
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 20/06/2025
And of course... sometimes you get to have a volcano in the background.
Kīlauea volcano erupting out of Halemaʻumaʻu crater, as witnessed by 'ōhi'a
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Ruben Cousins-Westerberg @rucouwes.bsky.social · 20/06/2025
If I wasn't already tied up with a different plant, I'm not sure I could resist falling headfirst in love with the ʻōhiʻa lehua. Not only do they pop up out of the lava rock like it's nothing, they also have such amazing blossoms!
The ʻōhiʻa lehua (Metrosideros polymorpha) os the state tree of Hawai'i, and the official tree of the island of Hawai'i too.The volcano goddess Pele is often depicted with ʻōhiʻa blossoms in her hair. Not strange, given how they are the earliest pioneers on the lava field, and yet remain dominant there for hundreds of years after. Also not strange given how pretty they are.An ʻōhiʻa blossom in all their glory. As I understand it, they are generally adapted to be pollinated by birds, although there apparently are some trees with more yellowish and compact flowers that specialise on insects.ʻŌhiʻa popping out of the lava at the bottom of Kīlauea Iki crater like nobody's business.
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