Bart Hoekstra
@barthoekstra.bsky.social
Movement Ecology PhD candidate @ IBED, University of Amsterdam | Radar Aeroecology | Birds | Energy | Climate | Monitoring & Comms. @batumiraptorcount.org | Remote Sensing | Open Science | He/Him | barthoekstra.com
Aurora Borealis, from the middle of Amsterdam. Visible with the naked eye. Truly exceptional from this light polluted part of the Netherlands. Go outside if you can! #auroraborealis #noorderlicht
January 19, 2026 at 11:13 PM
Aurora Borealis, from the middle of Amsterdam. Visible with the naked eye. Truly exceptional from this light polluted part of the Netherlands. Go outside if you can! #auroraborealis #noorderlicht
Reposted by Bart Hoekstra
I research dictatorships for a living and have spend a non-negligible amount of time reading the words of madmen like Gaddafi, Hitler, and the Kims of North Korea. Even to me this is fucking bunkers.
![NEW: @potus letter to @jonasgahrstore links @NobelPrize to Greenland, reiterates threats, and is forwarded by the NSC staff to multiple European ambassadors in Washington. I obtained the text from multiple officials:
Dear Ambassador:
President Trump has asked that the following message, shared with Prime Minister Jonas Gahr Støre, be forwarded to your [named head of government/state]
“Dear Jonas: Considering your Country decided not to give me the Nobel Peace Prize for having stopped 8 Wars PLUS, I no longer feel an obligation to think purely of Peace, although it will always be predominant, but can now think about what is good and proper for the United States of America. Denmark cannot protect that land from Russia or China, and why do they have a “right of ownership” anyway? There are no written documents, it’s only that a boat landed there hundreds of years ago, but we had boats landing there, also. I have done more for NATO than any other person since its founding, and now, NATO should do something for the United States. The World is not secure unless we have Complete and Total Control of Greenland. Thank you! President DJT”](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:hbpefio3f5csc44msmbgioxz/bafkreie7itpptx3xbxhpsnlaqmwk752h7pcrion5ija2apksljtax2adx4@jpeg)
January 19, 2026 at 9:09 AM
I research dictatorships for a living and have spend a non-negligible amount of time reading the words of madmen like Gaddafi, Hitler, and the Kims of North Korea. Even to me this is fucking bunkers.
Reposted by Bart Hoekstra
The ICC is under U.S. siege, the majority of Dutch journalists don’t seem te care. The new MAGA world order is here.
The penalties effectively cut the judges off from all American funds, goods and credit cards, and prohibit individuals and business in the U.S. from working with them. “We’re treated like pariahs, we are on a list with terrorists and drug dealers,” Ms. Ibáñez said. www.nytimes.com/2026/01/10/w...
No Amazon, No Gmail: Trump Sanctions Upend the Lives of I.C.C. Judges
www.nytimes.com
January 11, 2026 at 1:56 PM
The ICC is under U.S. siege, the majority of Dutch journalists don’t seem te care. The new MAGA world order is here.
Happy New Year! 🎆
As expected, sadly, the radars once again lit up with MILLIONS of birds fleeing from #fireworks.
GIF of the @knmi.nl Herwijnen radar
See other years: horizon.science.uva.nl/fireworks/
Thread and more science below 🧪🪶
As expected, sadly, the radars once again lit up with MILLIONS of birds fleeing from #fireworks.
GIF of the @knmi.nl Herwijnen radar
See other years: horizon.science.uva.nl/fireworks/
Thread and more science below 🧪🪶
January 1, 2026 at 9:23 AM
Happy New Year! 🎆
As expected, sadly, the radars once again lit up with MILLIONS of birds fleeing from #fireworks.
GIF of the @knmi.nl Herwijnen radar
See other years: horizon.science.uva.nl/fireworks/
Thread and more science below 🧪🪶
As expected, sadly, the radars once again lit up with MILLIONS of birds fleeing from #fireworks.
GIF of the @knmi.nl Herwijnen radar
See other years: horizon.science.uva.nl/fireworks/
Thread and more science below 🧪🪶
Reposted by Bart Hoekstra
Another NYE, another night of terror for millions of birds across the Netherlands (and around the world).
Last year we published in @ecologicalsociety.bsky.social Frontiers 🧪 about the massive impact of fireworks on birds 🦅.
Paper: doi.org/10.1002/fee....
Thread below 🧵👇
Last year we published in @ecologicalsociety.bsky.social Frontiers 🧪 about the massive impact of fireworks on birds 🦅.
Paper: doi.org/10.1002/fee....
Thread below 🧵👇
December 30, 2024 at 10:55 AM
Another NYE, another night of terror for millions of birds across the Netherlands (and around the world).
Last year we published in @ecologicalsociety.bsky.social Frontiers 🧪 about the massive impact of fireworks on birds 🦅.
Paper: doi.org/10.1002/fee....
Thread below 🧵👇
Last year we published in @ecologicalsociety.bsky.social Frontiers 🧪 about the massive impact of fireworks on birds 🦅.
Paper: doi.org/10.1002/fee....
Thread below 🧵👇
Reposted by Bart Hoekstra
another robot highlight for 2025: man wearing humanoid mocap suit kicks himself in the balls
December 27, 2025 at 5:27 PM
another robot highlight for 2025: man wearing humanoid mocap suit kicks himself in the balls
Reposted by Bart Hoekstra
The @nytimes.com Lost Science series continues. Here's my Q&A with a scientist who was studying how wildfire smoke threatens human health when the EPA decided that her research was no longer a funding priority. Gift link: nyti.ms/4jhpw14
December 27, 2025 at 5:11 PM
The @nytimes.com Lost Science series continues. Here's my Q&A with a scientist who was studying how wildfire smoke threatens human health when the EPA decided that her research was no longer a funding priority. Gift link: nyti.ms/4jhpw14
Reposted by Bart Hoekstra
Recommended read: our 2025 Autumn Report is out!
As part of our tradition and commitment, we’ve compiled a comprehensive overview of the season’s highlights and phenological peculiarities — complemented by many beautiful photos of both birds and people!
👉 batumiraptorcount.org/autumn-report-2025
As part of our tradition and commitment, we’ve compiled a comprehensive overview of the season’s highlights and phenological peculiarities — complemented by many beautiful photos of both birds and people!
👉 batumiraptorcount.org/autumn-report-2025
December 24, 2025 at 8:30 AM
Recommended read: our 2025 Autumn Report is out!
As part of our tradition and commitment, we’ve compiled a comprehensive overview of the season’s highlights and phenological peculiarities — complemented by many beautiful photos of both birds and people!
👉 batumiraptorcount.org/autumn-report-2025
As part of our tradition and commitment, we’ve compiled a comprehensive overview of the season’s highlights and phenological peculiarities — complemented by many beautiful photos of both birds and people!
👉 batumiraptorcount.org/autumn-report-2025
Reposted by Bart Hoekstra
Excited to launch the new improved Reproducible Code guide from @britishecologicalsociety.org @methodsinecoevol.bsky.social FREE online here! www.britishecologicalsociety.org//wp-content/... Amazing work by some very talented ECRs. We hope it’s useful!
December 16, 2025 at 3:03 PM
Excited to launch the new improved Reproducible Code guide from @britishecologicalsociety.org @methodsinecoevol.bsky.social FREE online here! www.britishecologicalsociety.org//wp-content/... Amazing work by some very talented ECRs. We hope it’s useful!
Reposted by Bart Hoekstra
How should the discipline of ecology and the community of ecologists respond to the ecological crisis? Is it time that these were put on something more akin to an emergency footing?
www.cell.com/action/showP...
www.cell.com/action/showP...
December 18, 2025 at 8:59 AM
How should the discipline of ecology and the community of ecologists respond to the ecological crisis? Is it time that these were put on something more akin to an emergency footing?
www.cell.com/action/showP...
www.cell.com/action/showP...
Reposted by Bart Hoekstra
The future of transportation isn’t the #Hyperloop* or self-driving cars. It’s the bus, the bike and the elevator. Via @slate.com.
AND it’s better land-use & infrastructure decisions, reprioritizing space & budgets, accessible streets, & smart pricing mechanisms.
*hyperloop was always a distraction
AND it’s better land-use & infrastructure decisions, reprioritizing space & budgets, accessible streets, & smart pricing mechanisms.
*hyperloop was always a distraction
The Future of Transportation Is Not the Hyperloop or the Self-Driving Car. It’s the Bus, the Bike, and the Elevator.
Getting people around in new, different ways relies mostly on technologies that we have had for a while.
slate.com
December 13, 2025 at 9:29 PM
The future of transportation isn’t the #Hyperloop* or self-driving cars. It’s the bus, the bike and the elevator. Via @slate.com.
AND it’s better land-use & infrastructure decisions, reprioritizing space & budgets, accessible streets, & smart pricing mechanisms.
*hyperloop was always a distraction
AND it’s better land-use & infrastructure decisions, reprioritizing space & budgets, accessible streets, & smart pricing mechanisms.
*hyperloop was always a distraction
Reposted by Bart Hoekstra
It has become received wisdom in Brussels and Washington that there is a new “euro-sclerosis”: that the EU economy is lagging the US
This view is wrong
A little primer on the measurement of productivity – and why reports of the economic death of Europe are greatly exaggerated🧵
This view is wrong
A little primer on the measurement of productivity – and why reports of the economic death of Europe are greatly exaggerated🧵
December 12, 2025 at 12:32 PM
It has become received wisdom in Brussels and Washington that there is a new “euro-sclerosis”: that the EU economy is lagging the US
This view is wrong
A little primer on the measurement of productivity – and why reports of the economic death of Europe are greatly exaggerated🧵
This view is wrong
A little primer on the measurement of productivity – and why reports of the economic death of Europe are greatly exaggerated🧵
Reposted by Bart Hoekstra
Apparently it can always get worse. The full version of the new U.S. National Security Strategy, aptly named “NSC-1488” by the wags, calls for actively pulling Poland, Austria, Hungary and Italy from the #EU. And supporting far right.
US sides with Putin.
notesfrompoland.com/2025/12/10/f...
US sides with Putin.
notesfrompoland.com/2025/12/10/f...
Fuller version of Trump security strategy reportedly calls for "pulling Poland away from EU"
notesfrompoland.com
December 11, 2025 at 5:48 AM
Apparently it can always get worse. The full version of the new U.S. National Security Strategy, aptly named “NSC-1488” by the wags, calls for actively pulling Poland, Austria, Hungary and Italy from the #EU. And supporting far right.
US sides with Putin.
notesfrompoland.com/2025/12/10/f...
US sides with Putin.
notesfrompoland.com/2025/12/10/f...
Reposted by Bart Hoekstra
A few thoughts on the new US national security strategy that was released today.
🧵
www.whitehouse.gov/wp-content/u...
🧵
www.whitehouse.gov/wp-content/u...
December 5, 2025 at 9:49 AM
A few thoughts on the new US national security strategy that was released today.
🧵
www.whitehouse.gov/wp-content/u...
🧵
www.whitehouse.gov/wp-content/u...
Reposted by Bart Hoekstra
I am very excited to share that we have a new paper out today in @natrevbiodiv.nature.com
In it, we summarize the state of knowledge on the Circular Seabird Economy!
1/n 🧪
Link to paper here: rdcu.be/eMOUd
In it, we summarize the state of knowledge on the Circular Seabird Economy!
1/n 🧪
Link to paper here: rdcu.be/eMOUd
October 27, 2025 at 2:33 PM
I am very excited to share that we have a new paper out today in @natrevbiodiv.nature.com
In it, we summarize the state of knowledge on the Circular Seabird Economy!
1/n 🧪
Link to paper here: rdcu.be/eMOUd
In it, we summarize the state of knowledge on the Circular Seabird Economy!
1/n 🧪
Link to paper here: rdcu.be/eMOUd
Reposted by Bart Hoekstra
Take three minutes to look at pretty birds, explore radar data, and see how we connect the structure of skies to MacArthur's ideas of niche partitioning. 📡🐦☁️🎧
November 20, 2025 at 6:28 PM
Take three minutes to look at pretty birds, explore radar data, and see how we connect the structure of skies to MacArthur's ideas of niche partitioning. 📡🐦☁️🎧
Reposted by Bart Hoekstra
So proud of this cover that features @barthoekstra.bsky.social amazing photo!
November issue out online now
www.cell.com/ecology-evol...
We hope you enjoy it!
The cover article is by Cecilia Nilsson and colleagues, photo by Bart Hoekstra
The penultimate interviews in our Disability series feature John Dennehy and Tara Cronin
www.cell.com/ecology-evol...
We hope you enjoy it!
The cover article is by Cecilia Nilsson and colleagues, photo by Bart Hoekstra
The penultimate interviews in our Disability series feature John Dennehy and Tara Cronin
November 17, 2025 at 8:42 AM
So proud of this cover that features @barthoekstra.bsky.social amazing photo!
Reposted by Bart Hoekstra
For the airplane + red aurora + big dipper fans. 😍
November 12, 2025 at 6:11 AM
For the airplane + red aurora + big dipper fans. 😍
I legit choked on my coffee fr 💀
Do you teach #rstats? Do your students complain about how lame and old-fashioned dplyr is? Don't worry: I have the solution for you: github.com/hadley/genzp....
genzplyr is dplyr, but bussin fr fr no cap.
genzplyr is dplyr, but bussin fr fr no cap.
GitHub - hadley/genzplyr: dplyr but make it bussin fr fr no cap
dplyr but make it bussin fr fr no cap. Contribute to hadley/genzplyr development by creating an account on GitHub.
github.com
November 7, 2025 at 2:55 PM
I legit choked on my coffee fr 💀
Reposted by Bart Hoekstra
Schrijver Jac. P. Thijsse telde ooit duizenden vinken langs deze laan. Waar zijn ze nu?
Leuk artikel van Addie Schulte in @nrc.nl.
www.nrc.nl/nieuws/2025/...
Leuk artikel van Addie Schulte in @nrc.nl.
www.nrc.nl/nieuws/2025/...
Schrijver Jac. P. Thijsse telde ooit duizenden vinken langs deze laan. Waar zijn ze nu?
Natuurhistorie: Een eeuw geleden was een van de mooiste lanen van Nederland een trekpleister voor vinken en kepen. De laan is nog steeds mooi, maar de meeste vogels zijn verdwenen. Ligt het aan de beu...
www.nrc.nl
November 1, 2025 at 5:07 AM
Schrijver Jac. P. Thijsse telde ooit duizenden vinken langs deze laan. Waar zijn ze nu?
Leuk artikel van Addie Schulte in @nrc.nl.
www.nrc.nl/nieuws/2025/...
Leuk artikel van Addie Schulte in @nrc.nl.
www.nrc.nl/nieuws/2025/...
To reduce negative impacts of #renewables (eg #windenergy) on migrating birds, we need to know *where* and how *high* they fly. Using weather radar, we mapped 6yrs of nocturnal migration over the Netherlands, revealing patterns we can use to avoid and minimize impacts:
doi.org/10.1016/j.je... 🧪🪶
doi.org/10.1016/j.je... 🧪🪶
October 30, 2025 at 12:58 PM
To reduce negative impacts of #renewables (eg #windenergy) on migrating birds, we need to know *where* and how *high* they fly. Using weather radar, we mapped 6yrs of nocturnal migration over the Netherlands, revealing patterns we can use to avoid and minimize impacts:
doi.org/10.1016/j.je... 🧪🪶
doi.org/10.1016/j.je... 🧪🪶
Reposted by Bart Hoekstra
Dispersal, maturation and recruitment in a long-lived, intercontinental migrant bird | www.sciencedirect.co... | Animal Behaviour | #ornithology 🪶
October 28, 2025 at 3:34 PM
Dispersal, maturation and recruitment in a long-lived, intercontinental migrant bird | www.sciencedirect.co... | Animal Behaviour | #ornithology 🪶
Reposted by Bart Hoekstra
🧪
Opinion piece on needs and why to improve on subseasonal-2-seasonal modeling i.e. the forecasting range that is in between short-term forecast (e.g local weather next week) and the seasonal ("will this winter be wet?").
Opinion piece on needs and why to improve on subseasonal-2-seasonal modeling i.e. the forecasting range that is in between short-term forecast (e.g local weather next week) and the seasonal ("will this winter be wet?").
October 21, 2025 at 4:09 PM
🧪
Opinion piece on needs and why to improve on subseasonal-2-seasonal modeling i.e. the forecasting range that is in between short-term forecast (e.g local weather next week) and the seasonal ("will this winter be wet?").
Opinion piece on needs and why to improve on subseasonal-2-seasonal modeling i.e. the forecasting range that is in between short-term forecast (e.g local weather next week) and the seasonal ("will this winter be wet?").
Reposted by Bart Hoekstra
This photo accompanying a news story about the heist at the Louvre is perfection.
October 19, 2025 at 9:56 PM
This photo accompanying a news story about the heist at the Louvre is perfection.