Julian Olden
@oldenfish.bsky.social
Professor @ UW | ecologist | freshwater | consumer of flat whites & craft 🍺 | gentle 🐟 squeezer | 🇨🇦 | EiC Water Biology and Biosecurity | AE @ESA Frontiers and Eco Apps | www.oldenfish.com | Views are my own ✊
Late night, but there is no better feeling that having stable isotope samples all prepped! ⚛️🎉
November 24, 2025 at 3:27 PM
Late night, but there is no better feeling that having stable isotope samples all prepped! ⚛️🎉
Finally found some time to reconnect with my caps. Red swamp crayfish in all its glory. Adding it to my office wall! @newbelgium.bsky.social @pikebrewing.bsky.social
November 24, 2025 at 3:56 AM
Finally found some time to reconnect with my caps. Red swamp crayfish in all its glory. Adding it to my office wall! @newbelgium.bsky.social @pikebrewing.bsky.social
Sunrise from UW SAFS @uwsafs.bsky.social. Not a bad way to start the day! ☀️
November 21, 2025 at 3:23 PM
Sunrise from UW SAFS @uwsafs.bsky.social. Not a bad way to start the day! ☀️
Is Facebook fueling the online trade in aquatic invasive species?
Survey of hobbyists indicates that over half engage in peer-to-peer organism exchange, transport across state lines & release them into the wild.
AI Podcast: open.substack.com/pub/oldenfis....
Paper: www.reabic.net/journals/mbi...
Survey of hobbyists indicates that over half engage in peer-to-peer organism exchange, transport across state lines & release them into the wild.
AI Podcast: open.substack.com/pub/oldenfis....
Paper: www.reabic.net/journals/mbi...
www.reabic.net
November 13, 2025 at 3:55 PM
Is Facebook fueling the online trade in aquatic invasive species?
Survey of hobbyists indicates that over half engage in peer-to-peer organism exchange, transport across state lines & release them into the wild.
AI Podcast: open.substack.com/pub/oldenfis....
Paper: www.reabic.net/journals/mbi...
Survey of hobbyists indicates that over half engage in peer-to-peer organism exchange, transport across state lines & release them into the wild.
AI Podcast: open.substack.com/pub/oldenfis....
Paper: www.reabic.net/journals/mbi...
The current website of the US Department of Agriculture. What a nightmare.
October 6, 2025 at 9:25 PM
The current website of the US Department of Agriculture. What a nightmare.
I've been proud to serve as the faculty leader for this effort. It has been a pleasure to interact with passionate students and emerging science communicators for many years now! We publish annually. I encourage you to check out past issues and follow! @uwsafs.bsky.social @trevorabranch.bsky.social
FieldNotes (fieldnotesjournal.org) is a student-run undergraduate journal and digital storytelling platform at @uwenvironment.bsky.social. We have focused on highlighting undergraduate research and publishing through-provoking articles about gnarly environmental issues since 2018. Please follow.
FIELDNOTES
fieldnotesjournal.org
September 28, 2025 at 9:48 PM
I've been proud to serve as the faculty leader for this effort. It has been a pleasure to interact with passionate students and emerging science communicators for many years now! We publish annually. I encourage you to check out past issues and follow! @uwsafs.bsky.social @trevorabranch.bsky.social
Fish ecologists routinely posit that functional trait analyses, founded either solely or in part on morphological traits, provide opportunities to guide global biodiversity conservation. Our paper just published in GEB sought to explore this claim. doi.org/10.1111/geb.... Read thread below.
doi.org
September 19, 2025 at 4:26 PM
Fish ecologists routinely posit that functional trait analyses, founded either solely or in part on morphological traits, provide opportunities to guide global biodiversity conservation. Our paper just published in GEB sought to explore this claim. doi.org/10.1111/geb.... Read thread below.
It was a real pleasure to participate in the Mazama Newt Workshop at Crater Lake hosted by the @oregonzoo.bsky.social and the National Park Service. Discussions focused on a recovery plan for the Mazama newt in light of an exploding invasive signal crayfish. Great to see @ericrlarson.bsky.social!
August 26, 2025 at 11:39 PM
It was a real pleasure to participate in the Mazama Newt Workshop at Crater Lake hosted by the @oregonzoo.bsky.social and the National Park Service. Discussions focused on a recovery plan for the Mazama newt in light of an exploding invasive signal crayfish. Great to see @ericrlarson.bsky.social!
Just out: Few-shot transfer learning enables robust acoustic monitoring of wildlife communities at the landscape scale. Super great work by Gio Jacuzzi. doi.org/10.1016/j.ec.... Github release: zenodo.org/records/1569...
July 6, 2025 at 3:44 PM
Just out: Few-shot transfer learning enables robust acoustic monitoring of wildlife communities at the landscape scale. Super great work by Gio Jacuzzi. doi.org/10.1016/j.ec.... Github release: zenodo.org/records/1569...
Wonderful to be able to spend some time at @iea-udg.bsky.social at @univgirona.bsky.social with my host and friend @garciaberthou.bsky.social. Looking forward to my seminar in a few hours!
June 26, 2025 at 7:35 AM
Wonderful to be able to spend some time at @iea-udg.bsky.social at @univgirona.bsky.social with my host and friend @garciaberthou.bsky.social. Looking forward to my seminar in a few hours!
A huge congrats to Dr. Diallo @jessdiallo.bsky.social! Many more great things lay ahead!
I'm excited to share that I've graduated with my PhD from @uwsafs.bsky.social, with a dissertation focused on the lifetime trophic ecology of fishes and invasive species management!
🐟 📈 🔬
Thank you to @oldenfish.bsky.social for your mentorship and support!
🐟 📈 🔬
Thank you to @oldenfish.bsky.social for your mentorship and support!
June 23, 2025 at 6:19 AM
A huge congrats to Dr. Diallo @jessdiallo.bsky.social! Many more great things lay ahead!
Another wonderful CESAB FOOD-WEBS working group meeting!. Such a wonderful and productive time (managed to submit 2 papers during the meeting) Special thanks to @profchrisharrod.bsky.social for hosting us at @sceneuog.bsky.social in Scotland! Funding: @frbiodiv.bsky.social
June 14, 2025 at 9:59 PM
Another wonderful CESAB FOOD-WEBS working group meeting!. Such a wonderful and productive time (managed to submit 2 papers during the meeting) Special thanks to @profchrisharrod.bsky.social for hosting us at @sceneuog.bsky.social in Scotland! Funding: @frbiodiv.bsky.social
Reposted by Julian Olden
The impact of invasive fishes lasts a lifetime -
we found lifetime trophic shifts in native species using fish eye lens stable isotope analysis coupled with otolith growth measurements 🐟 👁️ 📈
Check out the new pub with @oldenfish.bsky.social
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
we found lifetime trophic shifts in native species using fish eye lens stable isotope analysis coupled with otolith growth measurements 🐟 👁️ 📈
Check out the new pub with @oldenfish.bsky.social
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
June 3, 2025 at 9:29 PM
The impact of invasive fishes lasts a lifetime -
we found lifetime trophic shifts in native species using fish eye lens stable isotope analysis coupled with otolith growth measurements 🐟 👁️ 📈
Check out the new pub with @oldenfish.bsky.social
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
we found lifetime trophic shifts in native species using fish eye lens stable isotope analysis coupled with otolith growth measurements 🐟 👁️ 📈
Check out the new pub with @oldenfish.bsky.social
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
Management struggles to keep pace with invaders. With @jessdiallo.bsky.social and others we demonstrate the utility of removal models to help improve invasive removal programs & robustly evaluate the success of population suppression & eradication.
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
May 15, 2025 at 7:11 PM
Management struggles to keep pace with invaders. With @jessdiallo.bsky.social and others we demonstrate the utility of removal models to help improve invasive removal programs & robustly evaluate the success of population suppression & eradication.
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
✊
“The NSF can be understood not only as a catalyst of scientific promise for national purpose, but also as a guarded response to fears about centralized control over knowledge and thought, shaped by the dark shadows of the Third Reich and the emerging Red Scare.”
"For me, the answer now lies in refusal, the withdrawal of participation from systems that require dishonesty as the price of belonging."
Today I am resigning from the National Science Board and the Library of Congress Scholars Council.
I wrote about my decision in TIME.
time.com/7285045/resi...
Today I am resigning from the National Science Board and the Library of Congress Scholars Council.
I wrote about my decision in TIME.
time.com/7285045/resi...
May 13, 2025 at 6:14 PM
✊
I miss this article last week in all the chaos - but it's well worth the read. Thanks @jjopperman.bsky.social for all you do!
A poll of 30,000 people in 31 countries found that the public places very high value on water and prioritizes protecting water quality, lakes and rivers - and their priority actions are somewhat different than what companies generally focus on...
www.forbes.com/sites/jeffop...
www.forbes.com/sites/jeffop...
The Public Values Water But Sees Challenges Differently Than Companies
A set of polls—including more than 30,000 people across 31 countries—found that the public sees water as a top priority, with an emphasis on water quality.
www.forbes.com
May 9, 2025 at 2:05 PM
I miss this article last week in all the chaos - but it's well worth the read. Thanks @jjopperman.bsky.social for all you do!
Reposted by Julian Olden
🔊 America’s Most Endangered Rivers® of 2025 report! From Alaska to New Jersey, whether threatened by drought, mining, or flooding, these 10 rivers all have one thing in common: they are all at a tipping point, facing an urgent decision in the coming months.
Take action: mostendangeredrivers.org
Take action: mostendangeredrivers.org
April 16, 2025 at 6:58 AM
🔊 America’s Most Endangered Rivers® of 2025 report! From Alaska to New Jersey, whether threatened by drought, mining, or flooding, these 10 rivers all have one thing in common: they are all at a tipping point, facing an urgent decision in the coming months.
Take action: mostendangeredrivers.org
Take action: mostendangeredrivers.org
Dear friends and colleagues! I'm looking for a riparian zone (area) spatial layer for 🇨🇦 Canada 🇨🇦 (or ind. provinces/territories). Something simple that has been delineated using a DEM and estimated flood height, for example. Image below is purely eye candy. Many thanks ... from a Canadian 🇨🇦
April 17, 2025 at 3:09 PM
Dear friends and colleagues! I'm looking for a riparian zone (area) spatial layer for 🇨🇦 Canada 🇨🇦 (or ind. provinces/territories). Something simple that has been delineated using a DEM and estimated flood height, for example. Image below is purely eye candy. Many thanks ... from a Canadian 🇨🇦
Just returning from the Texas A&M Ecological Integration Symposium (eeb.tamu.edu/eis/). Thanks to the student organizing committee and all the other invited speakers! I presented on the current protection status of American's rivers and threats to protections in the future. @tamu.bsky.social
March 26, 2025 at 9:44 PM
Just returning from the Texas A&M Ecological Integration Symposium (eeb.tamu.edu/eis/). Thanks to the student organizing committee and all the other invited speakers! I presented on the current protection status of American's rivers and threats to protections in the future. @tamu.bsky.social
Really looking forward to reading this paper by Christina McCabe @jdtonkin.bsky.social and others! www.nature.com/articles/s44...
The ecological benefits of more room for rivers - Nature Water
This Review synthesizes the ecological features and processes that arise when rivers are given room to move. Understanding these interactions will support more sustainable decisions that weigh river e...
www.nature.com
March 26, 2025 at 4:19 PM
Really looking forward to reading this paper by Christina McCabe @jdtonkin.bsky.social and others! www.nature.com/articles/s44...
Reposted by Julian Olden
We can protect our nation’s freshwater species by:
✅ Removing Dams
✅ Restoring Damaged Rivers
✅ Protecting Healthy River Habitat
Take the pledge to stand up for all wildlife that depends on rivers #WorldWildlifeDay
act.americanrivers.org/page/80077/p...
✅ Removing Dams
✅ Restoring Damaged Rivers
✅ Protecting Healthy River Habitat
Take the pledge to stand up for all wildlife that depends on rivers #WorldWildlifeDay
act.americanrivers.org/page/80077/p...
Speak up for freshwater wildlife
Take the pledge to work to conserve our remaining natural areas to preserve nature and our fragile web of life.
act.americanrivers.org
March 3, 2025 at 3:25 PM
We can protect our nation’s freshwater species by:
✅ Removing Dams
✅ Restoring Damaged Rivers
✅ Protecting Healthy River Habitat
Take the pledge to stand up for all wildlife that depends on rivers #WorldWildlifeDay
act.americanrivers.org/page/80077/p...
✅ Removing Dams
✅ Restoring Damaged Rivers
✅ Protecting Healthy River Habitat
Take the pledge to stand up for all wildlife that depends on rivers #WorldWildlifeDay
act.americanrivers.org/page/80077/p...
A wonderful collaboration with friend Andre Padial and other Brazilian colleagues. We explored changes in biogeographic patterns in global fish diversity caused by the spread of non-native species, teasing apart the geographic and taxonomic drivers of change.
neobiota.pensoft.net/article/1266...
neobiota.pensoft.net/article/1266...
Non-native species drive the global loss of freshwater fish beta-diversity
Freshwater ecosystems are facing mounting challenges. The widespread introduction of non-native species, for example, has resulted in the loss of native species and the substantial reconfiguration of ...
neobiota.pensoft.net
February 24, 2025 at 4:22 PM
A wonderful collaboration with friend Andre Padial and other Brazilian colleagues. We explored changes in biogeographic patterns in global fish diversity caused by the spread of non-native species, teasing apart the geographic and taxonomic drivers of change.
neobiota.pensoft.net/article/1266...
neobiota.pensoft.net/article/1266...
Identifying and Approaching Barriers to Environmental Flow Implementation Using Social–Ecological Systems doi.org/10.1002/wat2... A wonderful collaboration with Maddy Grupper, Avril Horne and Angus Webb at University of Melbourne. @nature.org @wwf-water.bsky.social
Identifying and Approaching Barriers to Environmental Flow Implementation Using Social–Ecological Systems Thinking
Many barriers to environmental flow implementation relate to concepts that are examined in social–ecological systems (SES) frameworks but are outside of the scope of typical environmental flow. We ex...
doi.org
January 22, 2025 at 3:16 PM
Identifying and Approaching Barriers to Environmental Flow Implementation Using Social–Ecological Systems doi.org/10.1002/wat2... A wonderful collaboration with Maddy Grupper, Avril Horne and Angus Webb at University of Melbourne. @nature.org @wwf-water.bsky.social
Human barriers are replete across the world! This paper just out in Nature Water aims to advance a more comprehensive river barrier mapping solution to support environmental management
www.nature.com/articles/s44... @jjopperman.bsky.social @americanrivers.bsky.social @wwf-water.bsky.social
www.nature.com/articles/s44... @jjopperman.bsky.social @americanrivers.bsky.social @wwf-water.bsky.social
Towards a comprehensive river barrier mapping solution to support environmental management - Nature Water
This Review examines methods for mapping river barriers, emphasizing the potential consequences of a lack of data on smaller barriers. It highlights the need for improved mapping approaches to support...
www.nature.com
January 20, 2025 at 2:59 PM
Human barriers are replete across the world! This paper just out in Nature Water aims to advance a more comprehensive river barrier mapping solution to support environmental management
www.nature.com/articles/s44... @jjopperman.bsky.social @americanrivers.bsky.social @wwf-water.bsky.social
www.nature.com/articles/s44... @jjopperman.bsky.social @americanrivers.bsky.social @wwf-water.bsky.social
Invasion ecology is replete with a body of well-supported yet contradictory evidence for numerous invasion hypotheses, likely as a result of context dependency. Just published in DDI we explore the indirect effects & context dependencies in fish invasions. onlinelibrary.wiley.com/doi/10.1111/...
January 16, 2025 at 4:00 PM
Invasion ecology is replete with a body of well-supported yet contradictory evidence for numerous invasion hypotheses, likely as a result of context dependency. Just published in DDI we explore the indirect effects & context dependencies in fish invasions. onlinelibrary.wiley.com/doi/10.1111/...