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
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.
Reposted by Bart Hoekstra
This graph says it all: instead of starting to go down, the *annual increase* of atmospheric CO2 is setting new records. We're making climate change worse at a record rate.
Turning this around should be our top priority, and it's not.
From: www.carbonbrief.org/met-office-a...
Turning this around should be our top priority, and it's not.
From: www.carbonbrief.org/met-office-a...
October 18, 2025 at 7:33 PM
This graph says it all: instead of starting to go down, the *annual increase* of atmospheric CO2 is setting new records. We're making climate change worse at a record rate.
Turning this around should be our top priority, and it's not.
From: www.carbonbrief.org/met-office-a...
Turning this around should be our top priority, and it's not.
From: www.carbonbrief.org/met-office-a...
Reposted by Bart Hoekstra
"Charismatic species increased negative workplace experiences..."
No freakin' kidding.
Link: besjournals.onlinelibrary.wiley.com/doi/10.1002/...
No freakin' kidding.
Link: besjournals.onlinelibrary.wiley.com/doi/10.1002/...
October 17, 2025 at 3:12 PM
"Charismatic species increased negative workplace experiences..."
No freakin' kidding.
Link: besjournals.onlinelibrary.wiley.com/doi/10.1002/...
No freakin' kidding.
Link: besjournals.onlinelibrary.wiley.com/doi/10.1002/...
Reposted by Bart Hoekstra
Well, it's official. After our paper last year (onlinelibrary.wiley.com/doi/full/10....), the Slender-billed Curlew is officially declared Extinct today.
Scientists dream of describing new species, not writing their obituary and epitaph, knowing that they are gone forever #ornithology
Scientists dream of describing new species, not writing their obituary and epitaph, knowing that they are gone forever #ornithology
October 10, 2025 at 8:54 AM
Well, it's official. After our paper last year (onlinelibrary.wiley.com/doi/full/10....), the Slender-billed Curlew is officially declared Extinct today.
Scientists dream of describing new species, not writing their obituary and epitaph, knowing that they are gone forever #ornithology
Scientists dream of describing new species, not writing their obituary and epitaph, knowing that they are gone forever #ornithology
170K raptors! 🤯
8 yrs in the making, but I’ve finally witnessed a 100k+ raptors day while on the station actually counting the bulk of it. Incredible experience. Still feeling cross-eyed from staring through the scope non-stop for almost 10hrs.
📸: the Shuamta team at the end of this incredible day
8 yrs in the making, but I’ve finally witnessed a 100k+ raptors day while on the station actually counting the bulk of it. Incredible experience. Still feeling cross-eyed from staring through the scope non-stop for almost 10hrs.
📸: the Shuamta team at the end of this incredible day
October 2, 2025 at 5:42 AM
170K raptors! 🤯
8 yrs in the making, but I’ve finally witnessed a 100k+ raptors day while on the station actually counting the bulk of it. Incredible experience. Still feeling cross-eyed from staring through the scope non-stop for almost 10hrs.
📸: the Shuamta team at the end of this incredible day
8 yrs in the making, but I’ve finally witnessed a 100k+ raptors day while on the station actually counting the bulk of it. Incredible experience. Still feeling cross-eyed from staring through the scope non-stop for almost 10hrs.
📸: the Shuamta team at the end of this incredible day
Reposted by Bart Hoekstra
Some rare and remarkable processes are taking place this week, that we are not likely to observe for a long time!
These 2 Atlantic hurricanes are closer than any since at least the 1960s. They are now connected - in each other’s orbit, pivoting. Follow along 1/
These 2 Atlantic hurricanes are closer than any since at least the 1960s. They are now connected - in each other’s orbit, pivoting. Follow along 1/
September 30, 2025 at 10:05 PM
Some rare and remarkable processes are taking place this week, that we are not likely to observe for a long time!
These 2 Atlantic hurricanes are closer than any since at least the 1960s. They are now connected - in each other’s orbit, pivoting. Follow along 1/
These 2 Atlantic hurricanes are closer than any since at least the 1960s. They are now connected - in each other’s orbit, pivoting. Follow along 1/
Reposted by Bart Hoekstra
"We studied more than 70 different elections that took place in 12 western European countries over several decades, and found that when mainstream parties take more anti-immigration positions, it leads to more support for the radical right, not less."
Our research makes it clear: by capitulating to the right, Labour is driving voters to Reform UK | Tarik Abou-Chadi and Stuart Turnbull-Dugarte
Mimicking Farage on immigration is senseless. Labour voters feel betrayed; anti-immigration voters see through the ruse, say academics Tarik Abou-Chadi and Stuart Turnbull-Dugarte
www.theguardian.com
September 29, 2025 at 11:10 AM
"We studied more than 70 different elections that took place in 12 western European countries over several decades, and found that when mainstream parties take more anti-immigration positions, it leads to more support for the radical right, not less."
Reposted by Bart Hoekstra
I honestly don't think everyone talks enough about how amazing it was when the world came together to fix the hole in the ozone layer, so I wrote this:
everythingisamazing.substack.com/p/lets-all-r...
It's a good reminder of what we're capable of.
everythingisamazing.substack.com/p/lets-all-r...
It's a good reminder of what we're capable of.
Let's All Remember When We Saved The World
To remind ourselves we can do it again.
everythingisamazing.substack.com
September 25, 2025 at 8:10 PM
I honestly don't think everyone talks enough about how amazing it was when the world came together to fix the hole in the ozone layer, so I wrote this:
everythingisamazing.substack.com/p/lets-all-r...
It's a good reminder of what we're capable of.
everythingisamazing.substack.com/p/lets-all-r...
It's a good reminder of what we're capable of.
Reposted by Bart Hoekstra
A vagrant juvenile Sanderling turned up in Israel—likely after a single non-stop flight from the Dutch Wadden Sea. Here’s thread explaining why that’s remarkable and interesting. @wadertales.bsky.social @globalflyway.bsky.social #Birds #Migration
September 25, 2025 at 9:47 AM
A vagrant juvenile Sanderling turned up in Israel—likely after a single non-stop flight from the Dutch Wadden Sea. Here’s thread explaining why that’s remarkable and interesting. @wadertales.bsky.social @globalflyway.bsky.social #Birds #Migration
Reposted by Bart Hoekstra
Are animals randomly distributed in the air, or is there a structure to where and when we find them? In our new paper we outline factors that shape habitat use in the air, from abiotic structure to biotic interactions. A lot of fun discussions behind this one! 🦅🦋🦇🌬
www.cell.com/trends/ecolo...
www.cell.com/trends/ecolo...
Animal niches in the airspace
For flying animals, including many birds, bats, and insects, the air is a crucial
arena for a range of behaviors. Technological advances, such as year-round tracking
of flight altitudes and expanded u...
www.cell.com
September 22, 2025 at 8:04 AM
Are animals randomly distributed in the air, or is there a structure to where and when we find them? In our new paper we outline factors that shape habitat use in the air, from abiotic structure to biotic interactions. A lot of fun discussions behind this one! 🦅🦋🦇🌬
www.cell.com/trends/ecolo...
www.cell.com/trends/ecolo...
Reposted by Bart Hoekstra
Reposted by Bart Hoekstra
ONE MILLION RAPTORS!
The wait is over... Today #BRC17 hit the earliest 1-million mark in BRC history! Usually, this happens around end-September, but this year the raptors clearly had other plans.
And with still over a month to go, we expect plenty more to come!
1/2
#ornithology #RaptorResearch
The wait is over... Today #BRC17 hit the earliest 1-million mark in BRC history! Usually, this happens around end-September, but this year the raptors clearly had other plans.
And with still over a month to go, we expect plenty more to come!
1/2
#ornithology #RaptorResearch
September 17, 2025 at 3:18 PM
ONE MILLION RAPTORS!
The wait is over... Today #BRC17 hit the earliest 1-million mark in BRC history! Usually, this happens around end-September, but this year the raptors clearly had other plans.
And with still over a month to go, we expect plenty more to come!
1/2
#ornithology #RaptorResearch
The wait is over... Today #BRC17 hit the earliest 1-million mark in BRC history! Usually, this happens around end-September, but this year the raptors clearly had other plans.
And with still over a month to go, we expect plenty more to come!
1/2
#ornithology #RaptorResearch
Reposted by Bart Hoekstra
A good day to read about #aeroecology—and to appreciate the work being done by the good people at @nycbirdalliance.org and @cornellbirds.bsky.social to protect migratory birds. The #TributeinLight monitoring they do is so important (and respectful). 🌎 🐦 #ornithology #conservation
The sky is a complex habitat! We're excited to be featured in @smithsonianmag.bsky.social for our annual monitoring and artificial light research with @cornellbirds.bsky.social at the #TributeinLight.
https://loom.ly/Bix4wFk
https://loom.ly/Bix4wFk
The New Science of Aeroecology Reveals So Much About the Amazing Creatures That Populate the Skies and How Humans Can Ensure Their Survival
The sky above us is a complex ecosystem, just like the land and sea. A new field of research is bringing a fresh understanding of the birds, bugs and other species that live there
www.smithsonianmag.com
September 11, 2025 at 12:37 PM
A good day to read about #aeroecology—and to appreciate the work being done by the good people at @nycbirdalliance.org and @cornellbirds.bsky.social to protect migratory birds. The #TributeinLight monitoring they do is so important (and respectful). 🌎 🐦 #ornithology #conservation
Reposted by Bart Hoekstra
A new study led by @moveandconserve.bsky.social used GPS tracking to test the monitoring potential of Eilat and Batumi.
An invaluable step toward linking counted birds to their origins, but we found it needed some elaboration from a migration count perspective!
Our commentary: tinyurl.com/nnbzu7kc
An invaluable step toward linking counted birds to their origins, but we found it needed some elaboration from a migration count perspective!
Our commentary: tinyurl.com/nnbzu7kc
One million raptors: But where do they come from? — Batumi Raptor Count
As a migration counter, you can’t help but wonder: “Where did the bird I just tallied come from, and where is it going?” In light of BRC’s main aim — monitoring raptor population trends — this very ...
tinyurl.com
September 9, 2025 at 12:26 PM
A new study led by @moveandconserve.bsky.social used GPS tracking to test the monitoring potential of Eilat and Batumi.
An invaluable step toward linking counted birds to their origins, but we found it needed some elaboration from a migration count perspective!
Our commentary: tinyurl.com/nnbzu7kc
An invaluable step toward linking counted birds to their origins, but we found it needed some elaboration from a migration count perspective!
Our commentary: tinyurl.com/nnbzu7kc
Tomorrow at #CWW2025 I’ll present new work on using weather radars (the ones you check for 🌧️) to map nocturnal bird migration to support wind energy planning.
Join my talk at 11:30 (Auditorium Pasteur) to see how this can improve impact assessments and enable a more nature-inclusive energy future.
Join my talk at 11:30 (Auditorium Pasteur) to see how this can improve impact assessments and enable a more nature-inclusive energy future.
September 8, 2025 at 3:10 PM
Tomorrow at #CWW2025 I’ll present new work on using weather radars (the ones you check for 🌧️) to map nocturnal bird migration to support wind energy planning.
Join my talk at 11:30 (Auditorium Pasteur) to see how this can improve impact assessments and enable a more nature-inclusive energy future.
Join my talk at 11:30 (Auditorium Pasteur) to see how this can improve impact assessments and enable a more nature-inclusive energy future.
Some asked if we had a ‘beef’ with Efrat et al. — quite the contrary! Their elegant work merited a proper response, so we wrote a letter to share our view on their work and long-standing Qs about migration counts.
If the khachapuri doesn't get to us first, we still fit together through one door! 😁
If the khachapuri doesn't get to us first, we still fit together through one door! 😁
So they wrote a comment www.sciencedirect.com/science/arti...
They raised some good points, improving our initial work, and allowing us to address a few more aspects of our work
@barthoekstra.bsky.social @tohar-tal.bsky.social @wmgvs.bsky.social
#conservation #ornithology 🧪🐾🌎
They raised some good points, improving our initial work, and allowing us to address a few more aspects of our work
@barthoekstra.bsky.social @tohar-tal.bsky.social @wmgvs.bsky.social
#conservation #ornithology 🧪🐾🌎
Toward integrating migration counts and GPS tracking for flyway-scale avian population monitoring — A response to
www.sciencedirect.com
September 8, 2025 at 2:39 PM
Some asked if we had a ‘beef’ with Efrat et al. — quite the contrary! Their elegant work merited a proper response, so we wrote a letter to share our view on their work and long-standing Qs about migration counts.
If the khachapuri doesn't get to us first, we still fit together through one door! 😁
If the khachapuri doesn't get to us first, we still fit together through one door! 😁
Reposted by Bart Hoekstra
Science as a conversation:
In January, we published a paper about migratory bird counts www.sciencedirect.com/science/arti...
For different reasons, we did not include the managers of the bird counts. But the @batumiraptorcount.org people had some important comments
#conservation #ornithology 🧪🐾🌎
In January, we published a paper about migratory bird counts www.sciencedirect.com/science/arti...
For different reasons, we did not include the managers of the bird counts. But the @batumiraptorcount.org people had some important comments
#conservation #ornithology 🧪🐾🌎
Using GPS tracking data to validate the conservation value of bird migration counts
Effective conservation of migratory birds requires gathering of information about their population trends, often acquired using migratory bird counts.…
www.sciencedirect.com
September 8, 2025 at 7:03 AM
Science as a conversation:
In January, we published a paper about migratory bird counts www.sciencedirect.com/science/arti...
For different reasons, we did not include the managers of the bird counts. But the @batumiraptorcount.org people had some important comments
#conservation #ornithology 🧪🐾🌎
In January, we published a paper about migratory bird counts www.sciencedirect.com/science/arti...
For different reasons, we did not include the managers of the bird counts. But the @batumiraptorcount.org people had some important comments
#conservation #ornithology 🧪🐾🌎
Reposted by Bart Hoekstra
HALF A MILLION RAPTORS! 🦅
After a few slower days (~30K+), #BRC17 hit the absolute jackpot yesterday!
Around 11 am, the floodgates opened — massive streams of Honey Buzzards & Black Kites pushed us past 100K raptors in a single day! Bringing the season total to 540K😍
🧵1/3
Video by Zülfü Farajli
After a few slower days (~30K+), #BRC17 hit the absolute jackpot yesterday!
Around 11 am, the floodgates opened — massive streams of Honey Buzzards & Black Kites pushed us past 100K raptors in a single day! Bringing the season total to 540K😍
🧵1/3
Video by Zülfü Farajli
September 6, 2025 at 1:35 PM
HALF A MILLION RAPTORS! 🦅
After a few slower days (~30K+), #BRC17 hit the absolute jackpot yesterday!
Around 11 am, the floodgates opened — massive streams of Honey Buzzards & Black Kites pushed us past 100K raptors in a single day! Bringing the season total to 540K😍
🧵1/3
Video by Zülfü Farajli
After a few slower days (~30K+), #BRC17 hit the absolute jackpot yesterday!
Around 11 am, the floodgates opened — massive streams of Honey Buzzards & Black Kites pushed us past 100K raptors in a single day! Bringing the season total to 540K😍
🧵1/3
Video by Zülfü Farajli
Things are really kicking off now at #BRC17. Although by no means the most diverse period for raptor migration in Batumi, there is little as humbling as standing below a sky filled with thousands, tens of thousands, or even over a hundred thousand Honey Buzzards ‘marching’ onwards to Africa.
The Honey Buzzards have well and truly arrived, so the first 296,911 have already been counted #BRC17 🪶. It's been a period of everything: rain, fog, blazing sun, and then suddenly the sky explodes with raptors in typical Batumi fashion.
The team's report:
www.batumiraptorcount.org/brc17/2025/8...
The team's report:
www.batumiraptorcount.org/brc17/2025/8...
The Honey Buzzards have arrived! — Batumi Raptor Count
What week it has been in the bottleneck! The weather threw everything at us—rain, fog, blazing sun—but the migration didn’t stop, and neither did we.
www.batumiraptorcount.org
September 3, 2025 at 3:02 PM
Things are really kicking off now at #BRC17. Although by no means the most diverse period for raptor migration in Batumi, there is little as humbling as standing below a sky filled with thousands, tens of thousands, or even over a hundred thousand Honey Buzzards ‘marching’ onwards to Africa.