Sign in

Travis Longcore

@travislongcore.bsky.social
902 followers 355 following 116 posts

Cities & nature, light pollution, species & landscape conservation, maps & spatial analysis 🌎 Adj. Prof. UCLA Inst. of the Environment and Sustainability

PostsRepliesMedia
Reposted by Travis Longcore
Wes Siler @wessiler.bsky.social · 29/09/2026
Sure looks like the Secretary of the Interior is about to invoke emergency wartime powers to use taxpayer funds to build a bunch of data centers on public land, without any public input: wessiler.substack.com/p/whats-doug...
wessiler.substack.com
What’s Doug Burgum Doing With Defense Production Act Authority?
It sure looks like things are adding up for widespread data center construction on public lands, without public input
18302202
Reposted by Travis Longcore
Sen. Adam Schiff @schiff.senate.gov · 26/09/2026
For months, I’ve been raising the alarm about the loss of staff at the U.S. Fish and Wildlife Service and how it is imperiling their work protecting our wildlife and public lands. In December, 25% of the agency was gone. Now, it’s nearly 40%. But FWS still refuses to address the staffing crisis.
23417112
Reposted by Travis Longcore
Center for Space Environmentalism @space-environment.bsky.social · 28/08/2026
"The light pollution produced by each of those mirrors would completely wipe out stars from the sky for those underneath them, turning the starry night into an eerie twilight zone." www.space.com/space-explor... #Space #SpaceEnvironment #SunlightAsAService #ReflectOrbital
space.com
Massive space mirrors could be 40 times brighter than the full moon, astronomers warn. 'It will be worse than big cities like London'
Sun-reflecting space mirrors proposed by U.S. startup Reflect Orbital will have an even more devastating effect on the night sky around the world than previously thought, a study has found.
014
Reposted by Travis Longcore
American Bird Conservancy @abcbirds.bsky.social · 20/08/2026
The night sky is a highway for migrating birds, so what happens when it stops being dark? 🌙 The Federal Communications Commission recently greenlit the launch & operation of a test satellite for a company called Reflect Orbital. Read more from @nbcnews.com: abcbirds.info/4i9qw8P
12815
Reposted by Travis Longcore
Gregor Kalinkat @gkalinkat.bsky.social · 09/07/2026
Artificial light at night (ALAN) 💡 is a stronger inhibitor of overwintering dormancy than urban warming in mosquitoes 🦟 besjournals.onlinelibrary.wiley.com/doi/10.1111/... 🧪🔓
besjournals.onlinelibrary.wiley.com
Artificial light at night (<fc>ALAN</fc>) is a stronger inhibitor of overwintering dormancy than urban warming in mosquitoes
Low intensities of warm white ALAN were a stronger inhibitor of diapause initiation than urban warming, indicating that changes in brightness or light colour may not be sufficient to mitigate ecologi...
2228
Travis Longcore @travislongcore.bsky.social · 27/06/2026
I don’t understand the fight you’ve picked here. Do you believe the authors of the frame noir article are doing something so different from what you imagine? Aren’t we all looking for the metaphors that can move the public and make a difference? I must be missing something.
100
Reposted by Travis Longcore
Lawrence Culver @lawrencecphd.bsky.social · 07/06/2026
The administration has fired thousands of NPS, USFS, and BLM staff, and will fire more: “The broad aim of this travesty is to disconnect everyday citizens and visitors from their relationship to these lands, from our history, and from our collective ownership.” www.theguardian.com/commentisfre...
theguardian.com
The Trump administration is trying to kill a rule that protects millions of acres of national forests | Charles F Sams III
The bipartisan Roadless Rule is under fire. It’s just one way Trump could make our public lands unrecognizable
053
Travis Longcore @travislongcore.bsky.social · 18/03/2026
The idiocracy continues apace.
021
Reposted by Travis Longcore
martinswarren.bsky.social @martinswarren.bsky.social · 18/03/2026
Nice summary of long distance insect migration in the Guardian today with fancy graphics www.theguardian.com/environment/...
theguardian.com
Butterflies crossing oceans, moths navigating by the stars: unravelling the mysteries of insect migrations
Trillions of insects embark, largely unnoticed, on epic journeys every year across mountain ranges, deserts and seas, and it is only now, as their numbers suffer huge declines, that scientists are tra...
17131
Reposted by Travis Longcore
Jacob Wasserman @jacoblwasserman.bsky.social · 18/02/2026
Very interesting study shared by @jessica-meaney.bsky.social at her @uclaits.bsky.social talk today: bird species today vary by HOLC redlining zones a century, as @travislongcore.bsky.social @uclaioes.bsky.social and co-authors find: doi.org/10.1093/orni...
Redlining continues to be related to avifaunal community patterns, their habitat, and the people who experience them.
1123
Reposted by Travis Longcore
Journal of Experimental Biology @jexpbiol.bsky.social · 17/02/2026
Artificial light at night, urban noise, psychoactive pollutants, agriculture, introduced species & a warming world are making it difficult to sleep. John Lesku & Anne Aulesebrook review how species are affected & suggest ways to minimise the impact #SensoryPerceptionInAChangingWorld bit.ly/469cNrT
Sensory Perception in a Changing World graphic. The graphic has a black background. 
The text in the top right says: Special Issue.
Next line: Sensory Perception in a Changing World
Next line: Guest Editors: Almut Kelber, Kathleen M. Gilmour and Sanjay Sane
Next line: the Journal of Experimental Biology logo
Left of graphic: image showing a moth drinking nectar from  cluster of white flowers against two circular green leaves
01510
Reposted by Travis Longcore
Robin Heinen @robinheinennl.bsky.social · 04/02/2026
Paper 15: Brett Seymoure et al take us to the Chihuahuan desert to test impacts of ALAN shielding types and their resulting impacts on insects. Obviously, all ALAN attracted insects, but shielding, particularly to prevent glare, showed reduced insect attraction. www.sciencedirect.com/science/arti...
sciencedirect.com
Glare more than uplight attracts flying insects to artificial lights
Artificial lighting at night (ALAN) from residential, commercial, transportation, and other sources has substantially altered nocturnal light environm…
1113
Reposted by Travis Longcore
Robin Heinen @robinheinennl.bsky.social · 04/02/2026
Paper 13 is out: @travislongcore.bsky.social and colleagues present a detailed framework for ALAN risk assessment for species, using several real-world case studies as examples. Risks have not been taken into account enough in our bright world. Great work! www.sciencedirect.com/science/arti...
sciencedirect.com
Assessing and mapping taxon-specific effects of ecological light pollution for environmental impact analysis
Predicting the adverse effects of light at night is necessary to ensure compliance with laws and regulations that protect species. Using two case stud…
174
Travis Longcore @travislongcore.bsky.social · 27/01/2026
Special thanks to the detailed, patient, and constructive reviewers and the editors of the special issue of Biological Conservation where the study appears. Full issue here: www.sciencedirect.com/special-issu... fin/
sciencedirect.com
Biological Conservation | Artificial Light at Night from a local to global scale: biological impacts and conservation challenges | ScienceDirect.com by Elsevier
Artificial light at night (ALAN) has detrimental impacts on natural systems. Despite growing interest in ecology and a deeper understanding of how light pollution affects different taxa and processes,...
020
Travis Longcore @travislongcore.bsky.social · 27/01/2026
Study undertaken at @uclaioes.bsky.social, funded by California Department of Transportation (Caltrans), with collaborators @mherf.bsky.social and Clanton and Associates Lighting Design and Engineering.
120
Travis Longcore @travislongcore.bsky.social · 27/01/2026
Light pollution can be reduced safely, but it requires: 🔬 More spectral response data for wildlife 🖥️ Better integrated software tools 📋 Updated environmental review standards 🤝 Collaboration between lighting engineers + ecologists It's technically feasible. Let's make it standard practice. 7/
100
Travis Longcore @travislongcore.bsky.social · 27/01/2026
When is light pollution actually "pollution" for wildlife? 🚨 Our proposed thresholds (in animal-adjusted lux): <0.001: Minimal impact (but glare still matters) 0.01-0.1: Probable significant impacts 0.1: Definite significant impacts Why? 🌘 Moonlight is ~82% of night hours at <0.01 lux. 6/
100
Travis Longcore @travislongcore.bsky.social · 27/01/2026
We did this analysis with standard lighting software AGi32 + GIS, but it was tedious. The tools exist, but: Can't handle large areas Don't talk to each other Not designed for <0.1 lux precision We need platforms that combine lighting calculations + ecology + spatial data. Who's building this? 🛠️ 5/
100
Travis Longcore @travislongcore.bsky.social · 27/01/2026
Plot twist: Some shields made things worse. 😬 At one site, house-side shields increased forward light throw, expanding the impact area by 16%. Lesson: Environmental review needs site-specific analysis. We need better integration of lighting engineering + ecology. 4/
100
Travis Longcore @travislongcore.bsky.social · 27/01/2026
Real-world application: SR-12/SR-113 intersection in CA tiger salamander habitat. Before mitigation: Light >0.01 lux extended 200+ ft into habitat area. After shielding + spectral tuning: 38% reduction in area at >0.01 lux. 3/
100
Travis Longcore @travislongcore.bsky.social · 27/01/2026
Why moonlight? 🌒 Animals evolved with lunar cycles. Full moon = ~0.1 lux. But roadway lights can blast habitat with 10-50+ lux. We developed "moonlight equivalent illuminance"—showing how bright lights appear to each species based on their visual system. 2/
100
Travis Longcore @travislongcore.bsky.social · 27/01/2026
Environmental assessments need to account for spectrum and brightness of light affecting sensitive species. 🌙 We map impact zones using "moonlight equivalent" measures accounting for species visual sensitivity, then apply spectral tuning and shielding. 🔗 www.sciencedirect.com/science/arti... 1/
sciencedirect.com
Assessing and mapping taxon-specific effects of ecological light pollution for environmental impact analysis
Predicting the adverse effects of light at night is necessary to ensure compliance with laws and regulations that protect species. Using two case stud…
1126
Reposted by Travis Longcore
Michael Herf @mherf.bsky.social · 25/01/2026
I helped Travis with some moonlight calcs for this paper - our code figures out "how bright compared to moonlight is this light for each species". There is a ton of photometrics and spatial modeling here too: www.sciencedirect.com/science/arti...
sciencedirect.com
Assessing and mapping taxon-specific effects of ecological light pollution for environmental impact analysis
Predicting the adverse effects of light at night is necessary to ensure compliance with laws and regulations that protect species. Using two case stud…
151
Reposted by Travis Longcore
Kyle Saunders @kylesaunders.bsky.social · 01/01/2026
A sympathetic response to Ryan Briggs on trust in social science. My argument: the deepest problem isn’t error, but epistemic incommensurability-when fields lose shared standards for weighing evidence, experience, and interpretation. Trust depends on commensuration. open.substack.com/pub/kylesaun...
open.substack.com
Trust, Incommensurability, and the Limits of Intersubjectivity
A response to “Can We Trust Social Science Yet?” by Ryan Briggs
152
Reposted by Travis Longcore
Ian MacGregor-Fors @macgregorfors.bsky.social · 25/12/2025
📢 NEW SPECIAL ISSUE OUT! Excited to share a special issue I co-edited on bird–window collisions, a major yet overlooked source of bird mortality Bringing together 8 papers, this issue advances methods, evidence, and solutions to inform bird-friendly(er) built environments OA: tinyurl.com/yss5mvf2
21010
Reposted by Travis Longcore
UCLA Environment @uclaioes.bsky.social · 12/12/2025
A new UCLA–NRDC report shows massive pricing disparities in who pays what for water from the #ColoradoRiverBasin. Some California urban water agencies shell out over $2,500 per acre-foot of surface water, while some irrigation districts pay $0—for the exact same water. ucla.in/4pC6ODH @nrdc.org
083
Reposted by Travis Longcore
Ulrika Candolin @ulrikacandolin.bsky.social · 12/12/2025
NEW PAPER on impact of #lightpollution, led by Yuhan He who recently defended her PhD thesis. Historical Exposure to Artificial Light at Night Shapes Daphnia Responses: An Experiment Across an Urban–Rural Gradient - He - 2025 - Ecology and Evolution onlinelibrary.wiley.com/doi/10.1002/...
0365
Reposted by Travis Longcore
Ulrika Candolin @ulrikacandolin.bsky.social · 12/12/2025
Grateful for received #funding from @koneensaatio.fi for our project on impact of light pollution on the flux of insects between aquatic and terrestrial habitats. Will be looking for a #postdoc and a #PhD for 4 years – take contact if interested. koneensaatio.fi/apurahat-ja-...
koneensaatio.fi
Light pollution – a biodiversity threat: Impact on insect fluxes across ecosystem boundaries - Koneen Säätiö
Insect biodiversity is declining at an alarming rate. Light pollution has been identified as one contributing factor, yet its impact remains poorly known. Aquatic insects with terrestrial life stages ...
02610
Reposted by Travis Longcore
Sustainable LA @ UCLA @uclasustainablela.bsky.social · 04/12/2025
Join us for Policymaking Under Uncertainty: Zone 0 and Vegetation Management on Friday December 12, 2025 at 12 p.m. PT 👉 Register today: ucla.zoom.us/webinar/regi... @edithdeguzman.bsky.social | @travislongcore.bsky.social | Max Moritz | Alessandro Ossola | Nurit Katz
Policymaking Under Uncertainty: Zone 0 and Vegetation Clearance webinar announcement, Friday December 12, 2025 at 12PM PT. Panelists: Edith de Guzman, Travis Longcore, Max Moritz and Alessandro Ossola. Moderated by Nurit Katz and hosted by the UCLA Sustainable LA Grand Challenge.
122
Reposted by Travis Longcore
UCLA Emmett Institute @uclalawemmett.bsky.social · 24/11/2025
Read our suggestions for how to kickstart the important transformation of our urban environment to help shield residents from the worst effects of rising temperatures @uclaioes.bsky.social @law.ucla.edu @uclasustainablela.bsky.social @luskininnovation.bsky.social law.ucla.edu/news/reducin...
A woman using an umbrella to shield the sun on a park bench
087
Travis Longcore @travislongcore.bsky.social · 19/11/2025
You don't say. Quality of news outlets shared is lower on conservative social platforms. Bluesky --> more liberal and higher quality news outlets shared. PNAS paper: www.pnas.org/doi/10.1073/... Since you nerds asked, news outlet quality rankings from this paper: academic.oup.com/pnasnexus/ar...
020
Travis Longcore @travislongcore.bsky.social · 14/11/2025
Looks like a well-conceived and very necessary initiative; count me in!
093
Travis Longcore @travislongcore.bsky.social · 14/11/2025
Media picked up our latest extreme heat work and writes better headlines than I do.. www.yahoo.com/news/article... #urbanecology #extremeheat #parks
yahoo.com
Researchers make surprising discovery while studying people's behavior at public parks: 'One compelling exception'
They conducted the research using smartphone location data.
020
Travis Longcore @travislongcore.bsky.social · 06/11/2025
My projects have always done all-sky measurements under all conditions because I'm concerned with the effects on wildlife, as well as interested in seeing the stars. For example, this paper --> iopscience.iop.org/article/10.1... where we show the influence of the % clouds on illuminance.
iopscience.iop.org
Radware Bot Manager Captcha
To ensure we keep this website safe, please can you confirm you are a human by ticking the box below.
061
Reposted by Travis Longcore
Ricardo Rocha @ricardonature.bsky.social · 03/11/2025
In 2010-2013, conservation teams on #Chichijima - 1 of the main islands in the #Ogasawara chain - captured & removed 131 feral cats. The goal was to reduce predation pressure on an endangered pigeon. The results were immediate: adult pigeon numbers rose from 111 to 966 www.nature.com/articles/s42...
04011
Reposted by Travis Longcore
cira-csu.bsky.social @cira-csu.bsky.social · 30/10/2025
A look at the devastating power loss across Jamaica following the historic crossing of Hurricane Melissa, captured by NOAA-21.
8396197
Travis Longcore @travislongcore.bsky.social · 28/10/2025
The global biomass of mammals since 1850. On the bright side, a few more whales since the 1980s. www.nature.com/articles/s41...
020
Travis Longcore @travislongcore.bsky.social · 28/10/2025
Healthy forests have native pollinators.
030
Travis Longcore @travislongcore.bsky.social · 29/09/2025
Big thanks to @uclasustainablela.bsky.social at for funding the Heat Resilient LA project and @countyofla.bsky.social for their collaboration. end/
020
Travis Longcore @travislongcore.bsky.social · 29/09/2025
Put these papers together and when it comes to _outdoor_ exposure to extreme heat, you need to bring shade to the people where they are -- bus stops, parking lots, dropoff/pickup locations -- and similarly provide cooling locations close to where they are (minimize walking to get there). 7/
120
Travis Longcore @travislongcore.bsky.social · 29/09/2025
And: Space-time dynamics in hazard exposure analysis: smartphone locations show pedestrian routes are inflexible to extreme heat events. www.nature.com/articles/s44... 6/
nature.com
Space-time dynamics in hazard exposure analysis: smartphone locations show pedestrian routes are inflexible to extreme heat events - npj Natural Hazards
npj Natural Hazards - Space-time dynamics in hazard exposure analysis: smartphone locations show pedestrian routes are inflexible to extreme heat events
110
Travis Longcore @travislongcore.bsky.social · 29/09/2025
This is part of our series of papers using 📱 smartphone data to understand extreme heat impacts in Los Angeles. See: Smartphone locations reveal patterns of cooling center use as a heat mitigation strategy 🧊 www.sciencedirect.com/science/arti... 5/
sciencedirect.com
Smartphone locations reveal patterns of cooling center use as a heat mitigation strategy
The increasing frequency and duration of extreme heat events prompts questions regarding mitigation proposals and evaluation of current strategies suc…
110
Travis Longcore @travislongcore.bsky.social · 29/09/2025
Planners should focus shade for cooling in areas of greater convenience (i.e. along daily routes) during extreme heat. Invest in cooling centers, streetscapes, workplaces, and residential comfort. 🌳🌳🌳🌳🌳🌳🌳 4/
110
Travis Longcore @travislongcore.bsky.social · 29/09/2025
People from socially vulnerable areas are more likely to visit parks in less vulnerable areas than vice versa. The higher quality parks in more wealthy areas are visited by people curating their environments through mobility. 🚋 🚗🚲 4/
110
Travis Longcore @travislongcore.bsky.social · 29/09/2025
Time of day and day of week are more important to park use than weather. But people do stay later in the evening at parks when it is super hot. 3/
110
Travis Longcore @travislongcore.bsky.social · 29/09/2025
Parks are used slightly less during extreme heat days than paired control days. Parks are good to reduce temperatures, but to alleviate heat in events but are used less when it is hot. Except the beach. People go to the beach in LA when it is very hot. 🏖️☀️🏄‍♀️ 2/
110
Travis Longcore @travislongcore.bsky.social · 29/09/2025
🔥 New Paper Alert 🔥 -- from the incomparable @ioes.ucla.edu Senior Practicum in Environmental Science with the paper led by new alums Sammy Fruman and Bethany Woo --> anonymized smartphone data show park use in extreme heat 1/ #heat #hazards #mobility #cities www.sciencedirect.com/science/arti...
sciencedirect.com
Smartphone location data show park use patterns in extreme heat (Los Angeles, California, USA)
Climate change, combined with the Urban Heat Island effect, will generate more frequent, intense extreme heat events. These events can induce heat str…
163
Travis Longcore @travislongcore.bsky.social · 26/09/2025
Remembering a #lightpollution researcher gone too soon.
130
Reposted by Travis Longcore
Aaron Reichlin-Melnick @reichlinmelnick.bsky.social · 08/09/2025
Justice Sotomayor, not mincing words, also says that today's decision will lead to the "creation of [] a second-class citizenship status" for Latinos, who now will have the burden to "carry enough documentation to prove that they deserve to walk freely."
The concurrence relegates the interests of U. S. citizens
and individuals with legal status to a single sentence, positing that the Government will free these individuals as
soon as they show they are legally in the United States.
Ante, at 8 (opinion of KAVANAUGH, J.). That blinks reality.
Two plaintiffs in this very case tried to explain that they
are U. S. citizens; one was then pushed against a fence with
his arms twisted behind his back, and the other was taken away from his job to a warehouse for further questioning. More fundamentally, it is the Government’s burden to prove that it has reasonable suspicion to stop someone. The concurrence improperly shifts the burden onto an entire class of citizens to carry enough documentation to prove that they deserve to walk freely. The Constitution does not permit the creation of such a second-class citizenship status.
732427887