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 ✊
National assessment of river protection in the U.S.
Article: doi.org/10.1038/s418...
Policy Brief: doi.org/10.1038/s418...
Rivers Explorer: map.myriver.americanrivers.org
Collaboration b/t American Rivers, Conservation Science Partners, Univ WA @americanrivers.bsky.social
Thread 👇 | DM for PDF
Article: doi.org/10.1038/s418...
Policy Brief: doi.org/10.1038/s418...
Rivers Explorer: map.myriver.americanrivers.org
Collaboration b/t American Rivers, Conservation Science Partners, Univ WA @americanrivers.bsky.social
Thread 👇 | DM for PDF
January 9, 2026 at 6:18 PM
National assessment of river protection in the U.S.
Article: doi.org/10.1038/s418...
Policy Brief: doi.org/10.1038/s418...
Rivers Explorer: map.myriver.americanrivers.org
Collaboration b/t American Rivers, Conservation Science Partners, Univ WA @americanrivers.bsky.social
Thread 👇 | DM for PDF
Article: doi.org/10.1038/s418...
Policy Brief: doi.org/10.1038/s418...
Rivers Explorer: map.myriver.americanrivers.org
Collaboration b/t American Rivers, Conservation Science Partners, Univ WA @americanrivers.bsky.social
Thread 👇 | DM for PDF
Unraveling multipredator impacts in salmon-bearing rivers using quantitative DNA metabarcoding. A wonderful collaboration with @jwinkfish.bsky.social.
@uwsafs.bsky.social @uwenvironment.bsky.social @uwfreshwater.bsky.social
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esajournals.onlinelibrary.wiley.com/doi/10.1002/...
@uwsafs.bsky.social @uwenvironment.bsky.social @uwfreshwater.bsky.social
👇
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
December 19, 2025 at 4:00 PM
Unraveling multipredator impacts in salmon-bearing rivers using quantitative DNA metabarcoding. A wonderful collaboration with @jwinkfish.bsky.social.
@uwsafs.bsky.social @uwenvironment.bsky.social @uwfreshwater.bsky.social
👇
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
@uwsafs.bsky.social @uwenvironment.bsky.social @uwfreshwater.bsky.social
👇
esajournals.onlinelibrary.wiley.com/doi/10.1002/...
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! ☀️
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.
Funding: CESAB programme of @frbiodiv.bsky.social. Great list of co-authors and fun working group! @uwsafs.bsky.social @uwfreshwater.bsky.social @profchrisharrod.bsky.social @profchrisharrod.bsky.social
September 19, 2025 at 4:26 PM
Funding: CESAB programme of @frbiodiv.bsky.social. Great list of co-authors and fun working group! @uwsafs.bsky.social @uwfreshwater.bsky.social @profchrisharrod.bsky.social @profchrisharrod.bsky.social
In a global test, we show that morphological traits show weak (ca. 10% var exp) associations with d13C & d15N for freshwater fish species. At the individual level, morphology explained 4% in isotopic variation within populations. Body size & jaw length explained some var, albeit not much.
September 19, 2025 at 4:26 PM
In a global test, we show that morphological traits show weak (ca. 10% var exp) associations with d13C & d15N for freshwater fish species. At the individual level, morphology explained 4% in isotopic variation within populations. Body size & jaw length explained some var, albeit not much.
Support of such claims depends on the fundamental, albeit often unspoken, assumption that morphological characteristics of fish, such as body size & shape, fin configuration, & the size & orientation of the mouth and eyes, serve as reliable indicators of their feeding strategies & prey preferences.
September 19, 2025 at 4:26 PM
Support of such claims depends on the fundamental, albeit often unspoken, assumption that morphological characteristics of fish, such as body size & shape, fin configuration, & the size & orientation of the mouth and eyes, serve as reliable indicators of their feeding strategies & prey preferences.
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!
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!
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
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/...
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
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/...
Nice one Solomon! One of my fondest projects was working with the Australian lungfish in the Mary River (2004!).
December 22, 2024 at 5:35 PM
Nice one Solomon! One of my fondest projects was working with the Australian lungfish in the Mary River (2004!).
A wonderful holiday card from @clairevaage.bsky.social. It’s impossible not to get holiday cheer from an eastern mudminnow! With the added bonus of Olden Lab stickers!
December 21, 2024 at 5:53 PM
A wonderful holiday card from @clairevaage.bsky.social. It’s impossible not to get holiday cheer from an eastern mudminnow! With the added bonus of Olden Lab stickers!
New paper in @freshwaterscience.bsky.social reporting on the efficiency and effectiveness of an innovative new methodology called autonomous suction harvesting that controls aquatic invasive plant using a ROV instead of a diver . Paper <- dx.doi.org/10.1086/733211 or find at RG @uwsafs.bsky.social
December 12, 2024 at 12:17 AM
New paper in @freshwaterscience.bsky.social reporting on the efficiency and effectiveness of an innovative new methodology called autonomous suction harvesting that controls aquatic invasive plant using a ROV instead of a diver . Paper <- dx.doi.org/10.1086/733211 or find at RG @uwsafs.bsky.social
People often ask me "what do you work on?". At the end of an exhausting day, I wish I could make stickers of this word cloud and just slap it on their shoulders! ;)
December 7, 2024 at 5:18 PM
People often ask me "what do you work on?". At the end of an exhausting day, I wish I could make stickers of this word cloud and just slap it on their shoulders! ;)
Our new study reports that over 13,000 human barriers fragment close to THREE-QUARTERS of all rivers in the Mekong River Basin.
Paper is free to access here: doi.org/10.1016/j.rs....
Paper is free to access here: doi.org/10.1016/j.rs....
December 4, 2024 at 6:49 PM
Our new study reports that over 13,000 human barriers fragment close to THREE-QUARTERS of all rivers in the Mekong River Basin.
Paper is free to access here: doi.org/10.1016/j.rs....
Paper is free to access here: doi.org/10.1016/j.rs....
Global invasion and biosecurity risk from the online trade in ornamental crayfish - just out in ConBiology. We conducted the first global assessment of the online trade in and associated invasion risk of freshwater crayfishes. conbio.onlinelibrary.wiley.com/doi/10.1111/...
October 5, 2024 at 6:02 PM
Global invasion and biosecurity risk from the online trade in ornamental crayfish - just out in ConBiology. We conducted the first global assessment of the online trade in and associated invasion risk of freshwater crayfishes. conbio.onlinelibrary.wiley.com/doi/10.1111/...
Hi folks. I'm eagerly awaiting re-connection with my science colleagues and friends. Let's do this!
February 16, 2024 at 4:14 PM
Hi folks. I'm eagerly awaiting re-connection with my science colleagues and friends. Let's do this!