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Dr Nadiah Kristensen

@nadiah.bsky.social
2.4K followers 1.1K following 571 posts

modeller of ecology, evolution, and cooperation | she/her | 🤘 | 🐘 fediscience.org/@nadiah | nadiah.org

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Dr Nadiah Kristensen @nadiah.bsky.social · 13/06/2026
The whole article is very interesting
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Dr Nadiah Kristensen @nadiah.bsky.social · 13/06/2026
My goal here though is not to speed up but to make richer. If anything it slows me down (more to check and learn), so I don’t think that counts as what people usually mean by a “productivity gain”.
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Dr Nadiah Kristensen @nadiah.bsky.social · 13/06/2026
This matches my experience that Claude is only useful for modelling work when its outputs pass first through my own understanding, which is also one way to catch its mishallucinations From: www.bostonreview.net/articles/kno...
No one seriously doubted that the arguments underlying the computer calculations were correct; the objection instead hinged on the separation of proof from our old friend understanding, as in this reaction by British mathematician Frank Bonsall: “We cannot possibly achieve what I regard as the essential element of a proof—our own personal understanding—if part of the argument is hidden away in a box.”
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Dr Nadiah Kristensen @nadiah.bsky.social · 04/03/2026
Knuth: "Shock! Shock! I learned yesterday that an open problem I'd been working on for several weeks had just been solved by Claude Opus 4.6 ... What a joy it is to learn not only that my conjecture has a nice solution but also to celebrate this dramatic advance in automatic deduction."
www-cs-faculty.stanford.edu
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Dr Nadiah Kristensen @nadiah.bsky.social · 02/03/2026
On a headcount basis, approximately 40% of university staff are casual. Source: andrewnorton.id.au/2021/04/16/h...
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Dr Nadiah Kristensen @nadiah.bsky.social · 02/03/2026
Proportions of respondents by employment status: Ongoing/Continuing (78%), Fixed Term (15%), Casual (6%), and Honorary appointment (1%).
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Dr Nadiah Kristensen @nadiah.bsky.social · 02/03/2026
Nationally, 11-12% of Australian workers are in a very high-risk psychosocial safety climate. In universities, that jumps to 44%.
stresscafe.net
Census - Stress Cafe
Despite multiple government reviews – including the Australian Universities Accord and a Senate Inquiry – staff wellbeing in the workplace has received little direct attention. In response, the Austra...
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Dr Nadiah Kristensen @nadiah.bsky.social · 02/03/2026
Anyway, join your union @nteunion.bsky.social
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Dr Nadiah Kristensen @nadiah.bsky.social · 02/03/2026
Sorry, this is a little vague. I can’t refer back to the email for details because I had some big feelings about it and immediately deleted it.
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Dr Nadiah Kristensen @nadiah.bsky.social · 02/03/2026
I got an email celebrating a Faculty wellbeing initiative. Some lovely colleagues have been volunteering to do things like deliver flowers and citrus fruits to the tearooms to lift our spirits.
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Dr Nadiah Kristensen @nadiah.bsky.social · 23/02/2026
(My contribution was the analytic and semi-analytic portions of the paper)
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Dr Nadiah Kristensen @nadiah.bsky.social · 23/02/2026
You'd think requiring everyone to agree to the fishing level would protect fish better, but this new paper shows consensus-based voting can lead to worse conservation outcomes when the fishery was already highly exploited. Congratulations to Irina Lerner on her first paper 🎉
conbio.onlinelibrary.wiley.com
Voting Systems Influence Conservation Outcomes for International Fisheries
Fishery stocks that range partly or entirely beyond national jurisdictions pose substantial coordination challenges. Regional Fishery Management Organizations (RFMOs) were created to coordinate the s...
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Dr Nadiah Kristensen @nadiah.bsky.social · 30/01/2026
We need $484 billion/year for nature-based climate solutions by 2030. But how do you convince investors when a single cyclone can erase years of restoration? Jordan Holdorf's new paper shows adaptive timing of investments can make risky projects financially viable.
onlinelibrary.wiley.com
Adaptive temporal optimization of restoration investments with blue carbon returns and climate risks
This framework provides a tool for conservation scientists to develop adaptive investment plans for restoration projects under climate risk. Using project-specific data, it shows how carbon markets c...
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Dr Nadiah Kristensen @nadiah.bsky.social · 28/12/2025
To be clear, I have no idea what the answer is to all of this
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Dr Nadiah Kristensen @nadiah.bsky.social · 28/12/2025
It doesn't have to be this way (sincerely)
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/12/2025
Apparently Claude has been using Grokipedia for at least a month bsky.app/profile/dana...
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/12/2025
Thread summarising an arxiv preprint investigating what Grokipedia changed from Wikipedia by @harold.bsky.social and @mantzarlis.com bsky.app/profile/haro...
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/12/2025
Oh! I only noticed this morning. So it has been at least a month
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/12/2025
Some context for why this is not great www.theguardian.com/technology/2...
theguardian.com
White nationalist talking points and racial pseudoscience: welcome to Elon Musk’s Grokipedia
World’s richest person wanted to ‘purge’ propaganda from Wikipedia, so he created a compendium of racist disinformation
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/12/2025
Noticed this morning Claude also cites Grokipedia now
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/12/2025
Claude (Opus 4.5) has started citing Grokipedia in its results.
A screenshot of a Claude chat from the phone app with most of the text greyed out. The text at the top indicates Opus 4.5 is being used. The first block of text has a link indicating the content was sourced from Wikipedia. The second block has a link indicating the content was sourced from Grokipedia.
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Reposted by Dr Nadiah Kristensen
Shannon McSheffrey @medievalmcsheff.bsky.social · 22/12/2025
I posted this👇 to a claim that genAI is better than Ctl+F to search historical docs. @tristanpalmgren.bsky.social replied with a genAI summary of my document and @bookllyfr.bsky.social asked if it was accurate. It turns out that it did exactly what genAI does: made stuff up & got stuff wrong.🧵
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Dr Nadiah Kristensen @nadiah.bsky.social · 07/12/2025
That makes me really sad. They were both extremely successful in their fields. They didn't need to do that.
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Dr Nadiah Kristensen @nadiah.bsky.social · 07/12/2025
Haha, thank you, this was helpful.
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Dr Nadiah Kristensen @nadiah.bsky.social · 06/12/2025
Disrespecting reality seems like about 90% of what’s going wrong in the world right now
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Dr Nadiah Kristensen @nadiah.bsky.social · 05/12/2025
I really appreciated how this article led with the context I needed to put the newsworthy part into perspective
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Dr Nadiah Kristensen @nadiah.bsky.social · 04/12/2025
I wrote a blog post about a lecture introducing stability in ODE models and their numerical solution. The lecture transcript and code for figures are included. nadiah.org/2025/12/04/m...
nadiah.org
Lecture notes on stability in the dynamics and Euler’s method
This semester, I had the opportunity to do 7 weeks of “interactive lectures” at QUT for MXB261 Modelling and Simulation Science, as well as one guest lecture on evolutionary game theory. In this blog ...
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Dr Nadiah Kristensen @nadiah.bsky.social · 01/12/2025
This is so unjust.
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Dr Nadiah Kristensen @nadiah.bsky.social · 30/11/2025
Congratulations!
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Dr Nadiah Kristensen @nadiah.bsky.social · 30/11/2025
Congratulations!
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Reposted by Dr Nadiah Kristensen
Charlotte Patterson @charlotterubyp.bsky.social · 21/10/2025
🚨 Excited to share our new research! 🚨 We tackle a big question in conservation: how can we make smarter use of existing surveys to learn about places and species we haven’t yet been able to survey? 🏔️ 🔗 Read the paper here: doi.org/10.1111/2041...
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Reposted by Dr Nadiah Kristensen
Kalyani Twyman @kztwyman.bsky.social · 18/11/2025
Happy to share that our paper ‘a formal theory of group-level adaptation for obligate eusociality’ (with @andygardner.bsky.social) is now out in @jevbio.bsky.social advances. doi.org/10.1093/jeb/... #OpenAccess #Eusociality #GroupAdaptation #FormalDarwinism
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Dr Nadiah Kristensen @nadiah.bsky.social · 27/11/2025
Allegedly
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Dr Nadiah Kristensen @nadiah.bsky.social · 27/11/2025
Though funnily enough, we got a really thorough review at Sci Rep. The reviewer was so careful they picked up a right author but wrong paper mis-citation. I think they even found typos in the supplement, from memory (20 pages of mostly maths). But we could have got somewhere else.
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Dr Nadiah Kristensen @nadiah.bsky.social · 27/11/2025
A blessing for the system, not me. I really regret not going with my gut and saying “no” to submitting that paper to Scientific Reports. The Ecol. Model. ones can’t be helped because that was a respectable journal at the time, but Sci Rep has always felt dodgy. That’s a lesson learned for me.
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Dr Nadiah Kristensen @nadiah.bsky.social · 27/11/2025
… this could just be me being optimistic, but I think this could be a blessing in disguise.
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Dr Nadiah Kristensen @nadiah.bsky.social · 27/11/2025
The first one I posted about 3 months ago here (still up, btw) bsky.app/profile/nadi...
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Dr Nadiah Kristensen @nadiah.bsky.social · 27/11/2025
Awesome, this is the second journal I’ve published in that has since let through egregious AI slop.
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Dr Nadiah Kristensen @nadiah.bsky.social · 27/11/2025
Oh awesome, that’s two journals now that I’ve published in that have since let through egregious AI slop.
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/11/2025
Almost certainly not a kin selection model. That was a very my-own-field-biased thing to say.
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/11/2025
Or maybe there's some other way they think about it - I'm not an economist. I guess I'll have to go find out.
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/11/2025
I understand they need to suppress the individual-level model for clarity and tractability, so they need to assume some mechanism like niche-construction/intergenerational kin selection that makes individuals care for group interests in the future.
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/11/2025
The thing that gave me pause was the assumption that groups can care about their future. Their case studies were large-scale and long-term, like the persistence of the US Constitution.
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/11/2025
The institution-voting is modelled as a dynamic game (Markov Voting Equilibria approach). There is a discounting factor which allows groups to take into account the effect of future institutions on their payoffs. It's exciting it captures so much about their historical case studies.
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/11/2025
This was the overview, so I might have the details of the model wrong, but it seems to have two layers: (1) given the institution, the policy is determined by the median voter, and (2) voting on institutions themselves, which determine shares and which groups are enfranchised.
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/11/2025
Recently read a superstar outside my field, summarising their previous work modelling institutional change. A quite simple model, but it can capture, e.g., "strategic stability", where groups vote against a change that will benefit them bc it will open the door to future change that harms them.
sciencedirect.com
Institutional change and institutional persistence
In this essay, we provide a simple conceptual framework to elucidate the forces that lead to institutional persistence and change. Our framework is ba…
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Dr Nadiah Kristensen @nadiah.bsky.social · 26/11/2025
Clicking <3 so others notice that I noticed you noticing the noticing of your noticing.
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Dr Nadiah Kristensen @nadiah.bsky.social · 25/11/2025
Oh no
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Dr Nadiah Kristensen @nadiah.bsky.social · 25/11/2025
Why is altruism more common in nature than spite? This new paper gives a general mathematical explanation: the degree of negative assortment that can be achieved is constrained in a way that positive assortment is not, particularly in unbalanced populations. www.sciencedirect.com/science/arti...
Multi panel figure illustrating the following intuition for why group structures favoring altruism might be more common than those favoring spite. It considers the example scenarios with pairs of individuals. When the population is evenly split between 100 actors (altruistic or spiteful) and 100 non-actors, maximum positive assortment produces all same-type pairs (50 pairs actor+actor, 50 pairs actor+nonactor) and maximum negative assortment produces all opposite-type pairs (100 pairs actor+nonactor). Therefore, maximum assortativity produces equally group structures most favorable to altruism and group structures most favorable to spite. However, when actors outnumber non-actors (140 actors, 60 nonactors), positive and negative assortment have asymmetric effects on group structure. Maximum positive assortment still produces all same-type pairs (70 pairs actor+actor, 30 pairs actor+nonactor); however, maximum negative assortment cannot achieve all opposite-type pairs due to the surplus of actors – some same-type pairs (actor–actor) must remain (60 pairs actor+nonactor, 40 pairs actor+actor, ). Therefore, the maximum achievable positive assortment promotes altruism more effectively than the maximum negative assortment promotes spite. A similar asymmetry arises when non-actors outnumber actors (60 actors, 140 nonactors). Maximum positive assortment again produces all same-type pairs (30 pairs actor+actor, 70 pairs actor+nonactor), but maximum negative assortment cannot achieve all opposite-type pairs due to the surplus of non-actors – some same-type pairs (non-actor– non-actor) necessarily remain (60 pairs actor+nonactor, but 40 pairs nonactor+nonactor). Thus, once again, the maximum achievable positive assortment promotes altruism more effectively than the maximum negative assortment promotes spite.
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Dr Nadiah Kristensen @nadiah.bsky.social · 20/11/2025
🤯
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