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Justin Pomeranz @pzecology.bsky.social · 13/09/2026

I took my Stream Biomonitoring class on a collection trip yesterday. I didn't get nearly enough photos but this is always my favorite day. Getting people stoked on aquatic insects gets me all jazzed up. #ColoradoMesaUniversity #freshwater #ecology #insects

Students sorting macroinvertebrate specimens from a pan next to a mountain stream.

Jar with preserved aquatic macroinvertebrates collected during a field trip

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🍁 Alex Smith 🍁 @alexsmithants.bsky.social · 29/06/2026

🧪🧵 🪰 🐜🪲🐞🦗🐛🦋🪳🦟 How many species of insect are there? A seemingly simple question, but one that has been 'bugging' scientists for years. Our work out today suggests that there are millions more than we had previously expected. doi.org/10.1073/pnas... @gdfcf.bsky.social

This photo was taken in Area de Conservacion Guanacaste

This microgastrine wasp was named by co-author Jose Fernandez-Triana in honour of Costa Rican parataxonomist Roberto Espinoza in recognition of his contribution to understanding the plant biology of ACG. The species is Snellenius robertoespinozai. The image is Creative Commons Attribution License (CC BY 4.0) so can reused provided the original author (Jose Fernandez-Triana) and the source are properly cited. The source is: Fernandez-Triana JL, Whitfield JB, Smith MA, Kula RR, Hallwachs W, Janzen DH (2015) Revision of the genera Microplitis and Snellenius (Hymenoptera, Braconidae, Microgastrinae) from Area de Conservacion Guanacaste, Costa Rica, with a key to all species previously described from Mesoamerica. Deutsche Entomologische Zeitschrift 62(2): 137-201. https://doi.org/10.3897/dez.62.5276

image of a Malaise trap in Area de Conservacion Guanacaste

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Vojsava Gjoni @vojsavagjoni.bsky.social · 29/06/2026

Excited to share our paper in Ecology Letters @pzecology.bsky.social@jimjunker.bsky.social ker.bsky.social@wesnerlab.bsky.social! Using ~670,000 body sizes from stream food webs across North America, we show that warming does not necessarily favour smaller organisms, but depends on resource supply🌍🐟

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Justin Pomeranz @pzecology.bsky.social · 25/06/2026

🚨New paper led by @vojsavagjoni.bsky.social with @wesnerlab.bsky.social @jimjunker.bsky.social is out! 🧪🌎🌐 We analyzed over 670k body sizes in stream #foodWebs and found, contrary to theory, #SizeSpectra / #IndividualSizeDistributions do not become steeper in warmer temps, and become slightly ...1/2

onlinelibrary.wiley.com

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Justin Pomeranz @pzecology.bsky.social · 01/06/2026

My 4 year old found this in a stream while we were camping and screamed: "Look! Bug observations!" I couldn't be prouder. 🪲🪾

A tree branch (probably from an Aspen) showing numerous excavations, galleries, and nuptial chambers from several species of bark beetles.

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Justin Pomeranz @pzecology.bsky.social · 19/05/2026

Finally made it to #2026SFS #SFS2026! Come find me to say hi; I have stickers!

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Justin Pomeranz @pzecology.bsky.social · 17/05/2026

The PZ Ecology lab will be at #2026SFS this week! I'm excited to have two undergraduate students presenting on different aspects of body size in stream communities. I have yet another talk on estimating parameters describing individual size distributions (size spectra). See y'all in Spokane!

Slide advertising three talks at the annual meeting of the Society for Freshwater Science.
Katrina Heide: Between a rock and a cold place: Effects of rapid environmental warming on alpine stream communities. Monday, 4:45 PM
Reece Bollinger: Assessing Bergmann’s rule in freshwater macroinvertebrates using NEON data. Tuesday, 10:45 AM
Justin Pomeranz: Skewed Power Laws: Biased Data Bends λ and How to Bend it Back. Tuesday 3:15 PM

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Society for Freshwater Science @freshwaterscience.bsky.social · 01/02/2026

Do you consider yourself to be an inclusive mentor to budding scientists? STREAM is looking for friendly faces to commit to serving as a Freshwater Friend (an ally) to first-time conference attendees at the #2026SFS Annual Meeting in Spokane! (1/5)

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Justin Pomeranz @pzecology.bsky.social · 01/05/2026

New research grant kickoff meeting at the Uni of N Texas. Excited to keep working on individual size distributions / size spectra with @jimjunker.bsky.social @wesnerlab.bsky.social and welcome @fakamagwuna.bsky.social to the team.

Selfie of 4 people in front of a whiteboard outlining research plans.

Candid photo of two people planning work for a new research grant

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Justin Pomeranz @pzecology.bsky.social · 16/04/2026

I was sure this must be the ocean, but apparently this is what a "real river" looks like. Excerpt from: Notes from a dessert dog's travels in New Orleans.

Man standing in front of the Mississippi River front in New Orleans.

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Justin Pomeranz @pzecology.bsky.social · 16/04/2026

NOLA sightings. According to Seek, this is the caterpillar of a Gulf Coast Buck Moth *Hemileuca orleans*

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Justin Pomeranz @pzecology.bsky.social · 12/03/2026

Any myrmecologists out there that can tell me what's happening here? Seems like the whole colony is out, and most individuals are paired up with mandibles joined and antennae frantically dancing. Most appeared calm, but some pairs seemed aggressive, and I did see a few dead ones being carried out

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Justin Pomeranz @pzecology.bsky.social · 12/02/2026

It's always nice to know that famous, successful, obviously brilliant people struggle with self doubt and confidence, but reminder to practice positive self talk. You're probably harder on yourself than anyone else is. Work hard, do your best, & give yourself a break 😉 Also, happy birthday, Chuck.

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Justin Pomeranz @pzecology.bsky.social · 09/01/2026

@freshwaterscience.bsky.social any idea what the chances are of an extension on the abstract submission dates for the Spokane meeting are? Asking for a friend. Actually no, let's be honest, I'm asking for myself.

media.tenor.com

a woman with curly hair crosses her fingers

ALT: a woman with curly hair crosses her fingers

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Justin Pomeranz @pzecology.bsky.social · 30/12/2025

I guess we're using #2026SFS I think I get that wrong every year 😖

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Justin Pomeranz @pzecology.bsky.social · 29/12/2025

🧪 Very excited to learn that a recently graduated wundergrad from my lab got funding to present their research at #SFS2026 in Spokane in May! Watch this space to learn if/how Aq. macroinvertebrate 🦟 body size distributions ∆ in response to rapid environmental warming🌡️in mountain 🏔️ environments 🤠

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Natalie Cooper @nhcooper123.bsky.social · 16/12/2025

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!

Book cover for Reproducible Code guide. The cover has a red background with a large yellow-bodied black-headed stag beetle.

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Justin Pomeranz @pzecology.bsky.social · 02/12/2025

"Zombie" paper finally got a decision of major revision! It's not across the finish line yet but I feel like this thing has been in the wings for YEARS at this point. 🤞 For a good second round 🤞

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Justin Pomeranz @pzecology.bsky.social · 21/11/2025

I'm all about #NoKings but I think the EPA may have taken it too far

Screenshot of an onion article titled "EPA to monarch butterflies: count your fucking days"

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Justin Pomeranz @pzecology.bsky.social · 04/11/2025

Pleased to announce that we are looking for a post-doc to join @wesnerlab.bsky.social to study the relationship between body size, temperature and nutrients in stream ecosystems. Position details can be found here: yourfuture.sdbor.edu/postings/45969 Happy to answer any questions!

yourfuture.sdbor.edu

Postdoctoral Researcher, Biology

Postdoctoral Researcher: A Postdoctoral Research Associate position is available at the University of South Dakota in Dr. Jeff Wesner’s lab in the Department of Biology. The NSF-funded project will ex...

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Jen Cross @jencross.bsky.social · 01/11/2025

Pseudoscorpions are small arachnids that are often overlooked. They prey on clothes moth larvae, carpet beetle larvae, booklice, ants, mites, and small flies. Pseudoscorpions will sometimes hitch rides to new locations on other insects. #Arachtober

A tiny arachnid with a gold body and brick-reddish claws. It is standing on bark that looks like rough sandpaper.

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Justin Pomeranz @pzecology.bsky.social · 01/11/2025

Geo sciences at CMU is looking to fill TWO positions! coloradomesa.csod.com/ux/ats/caree... Career Site share.google/Mw8WKDznOOKg...

coloradomesa.csod.com

Assistant Professor of Geosciences

See job ad.

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Justin Pomeranz @pzecology.bsky.social · 26/10/2025

I know exactly what I want to say, so writing this MS report will be quick. ... 4 hours and 2 R simulations later... Report submitted ✅

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Justin Pomeranz @pzecology.bsky.social · 24/08/2025

I show the PBS "Serengeti Rules" documentary, which strongly features Jim Estes's research, to my intro class every semester. Sad to hear of his passing.

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Tom Astle @tjalamont.bsky.social · 24/08/2025

🐙🌿 An awesome little insect I found recently in Montana. It's a mantidfly/mantisfly, which is neither a mantis nor a fly. It's in the family Mantispidae, order Neuroptera along with lacewings, antlions, and owlflies. I think this one is Dicromantispa sayi. Adults are predators, and larvae of some--

A macro photo, side angle, of an insect called a mantidfly, facing down and to the right, on top of a piece of wood dappled with yellow and green lichens. The background is out of focus blue sky and greenery. The insect is overall a mix of dark and light brown/tan, with large, round, rainbow-green compound eyes. It's a long, thin insect, with mantis-like raptorial forelegs, clear lacewing-like wings folded along its back, and giraffe-neck-like extension of the thorax. Overall, it looks like a mashup of a mantis and a lacewing, hence the common name.

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Justin Pomeranz @pzecology.bsky.social · 23/08/2025

No views from today's trail run, but I scoped out the last unknown-to-me section for my next race #Ouray50. Just 21 more days to prep and rest before embarking on what is most likely going to be an absolute type 2 #sufferFest. Psyched.

Strava map of a run near Ouray, Colorado

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Rick Thoman @alaskawx.bsky.social · 13/08/2025

If you're a storymap kind of person, here's one that nicely explains what's happening & why with the glacial lake outburst flooding now underway on the Mendenhall River near Juneau. #akwx #ClimateChange #Flood #Glacier @spiraledu.bsky.social @alaska.bsky.social storymaps.arcgis.com/stories/72ce...

storymaps.arcgis.com

Glacier Outburst Floods: Mendenhall Glacier

Every year since 2011, Juneau, Alaska, has been impacted by a unique type of flood that can only occur near places with glaciers.

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Justin Pomeranz @pzecology.bsky.social · 22/08/2025

One unexpected enjoyment of teaching is observing students mature both academically and socially. I've now been in my position long enough that I'm starting to get folks in my senior-level classes that I first had 4 years ago in my freshman classes. The difference can be like night and day.

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Justin Pomeranz @pzecology.bsky.social · 21/08/2025

Requested this from my interlibrary loan; looking forward to digging into it.

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Justin Pomeranz @pzecology.bsky.social · 19/08/2025

Classes started today and my throat is on fire; I probably talked more today than I did all summer.

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Justin Pomeranz @pzecology.bsky.social · 18/08/2025

Could this be the origin of the mythical jackalope?? I wonder if frontier-stories of infected rabbits got exaggerated to stories of jack rabbits with deer-like antlers... www.scientificamerican.com/article/why-...

scientificamerican.com

Why Are Rabbits Sprouting Tentacles?

Rabbits spotted with hornlike growths on their face in northern Colorado are doing better than they look

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Justin Pomeranz @pzecology.bsky.social · 12/08/2025

Last Saturday, I had the privilege of waking up in the dark, watching the moon set over Moab, the sun rise over Castle Valley, feeling the wind rip at 12,000 feet, and was back in camp to watch the peaks alight with alpenglow. In between, I ran 50 miles and climbed >11k ft. Great day. #trailRunning

Night sight image of a campground with a full moon over a backlit mountain ridge.

Over exposed image of a full moon setting over a desert landscape illuminated by twilight.

Campers sitting in front of a desert hill with a wildfire color-enhanced sunset.

Part of a map of a 50 mile run near Moab and Castle Valley Utah.

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Justin Pomeranz @pzecology.bsky.social · 26/07/2025

Saw a Colorado Hairstreak (Hypaurotis crysalus) today on its host plant (Gamble oak, Quercus gambelii). This is Colorado's official state butterfly!

Purple and black butterfly on gamble oak leaves.

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Justin Pomeranz @pzecology.bsky.social · 12/07/2025

Happy #Hardrock100 to all who celebrate! This is old news but it was SO. SMOKEY. In the San Juans this morning. Glad it's cleared up for the runners and I'm blown away to hear that Katy Schide (as of 15 hours elapsed race time) is almost an hour ahead of Courtney Dauwalter's (🐐) course record pace 🤯

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Dr. Jessica L Ware @jessicalwarelab.bsky.social · 15/06/2025

Do you fish in freshwater? Please share or/and complete our survey gathering data on observations of insects for our study on aquatic insect population declines! The link to our survey is here: www.surveymonkey.com/r/VXLMY89. Please share if you know anyone who might be interested in participating!

a dragonfly perched on a hand wearing pink nailpolish

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Justin Pomeranz @pzecology.bsky.social · 28/06/2025

I am so excited for #westernStates100 #ws100 tomorrow. Can't wait to watch who starts crossing the line in about 24 hours from now 🤠🏃🤙 youtu.be/WHA8gO_A_gc?...

youtu.be

What Normal People Do | Western States 15 Years Later (Part II)

YouTube video by Kilian Jornet

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Justin Pomeranz @pzecology.bsky.social · 27/06/2025

Fantastic day of #trailRunning today. I don't have a ton of efforts on this local beast of a run, but I was able to shave off over 40 minutes on my previous PR. Incredible what nearly a year of consistent, structured training can do. If only I'd started earlier!

Map of a mountain run showing numerous segments with new personal records.

Screen shot from Strava with the following statistics: distance = 10.06 miles; elevation gain= 4,525 feet; moving time = 2:27:38; average pace = 14:40 minutes per mile; average grade adjusted pace = 9:29 minutes per mile.

Selfie of a runner at the top of a feature near Ouray, Colorado named "the bridge of heaven". The background shows craggy peaks with limited remaining snowfields.

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Society for Freshwater Science @freshwaterscience.bsky.social · 27/06/2025

Don't forget to apply for the Headwaters Leadership Academy by Monday!

Poster advertising the Headwaters Leadership Academy. The Headwaters Leadership Academy mission is to build a pipeline for emerging leaders by forming a network of early career freshwater scientists and providing mentorship, service, and professional development opportunities beyond the typical training offered in traditional academic setings. Apply by Monday, June 30th, 2025

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Justin Pomeranz @pzecology.bsky.social · 27/06/2025

Finally started Welcome to Wrexham S4 last night. I never thought a documentary about football would make me cry, and I never in a million years thought a documentary about football would make me almost cry multiple times per episode. I don't know what it is but it really kicks me straight in the 🩷.

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Justin Pomeranz @pzecology.bsky.social · 26/06/2025

Beautiful day for a #trailRun in the San Juan mountains of Colorado. I need to work on my loose, technical downhill running. Splits going up were almost faster than my downs 😂

Selfie of a runner wearing a red running vest and smiling in front of an outstanding mountain vista

Map of a trail run from Strava. Route is two loops going around two mountains connected by a high elevation traverse. Shape of the route is reminiscent of a bowtie or a barbell. Distance: 17.25 miles; elevation gain 5,785 feet

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Justin Pomeranz @pzecology.bsky.social · 20/06/2025

I've never actually gotten around to fitting species distribution models, but this package for abundance-based distribution models looks like it would be fun to play with.

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