Caleb Krueger
@cheloevo.bsky.social
PhD student at Michigan State’s Kellogg Biological Station researching spotted turtle phylogeography and the evolution of temperature-dependent sex determination
Reposted by Caleb Krueger
Graduate students, have you heard the news? The Orianne Society’s Grant Program for Reptile and Amphibian Conservation in the Southeast is now accepting applications!
Application deadline: 5PM EST, 21 November 2025
Scan QR code or follow link for details: www.oriannesociety.org/science-init...
Application deadline: 5PM EST, 21 November 2025
Scan QR code or follow link for details: www.oriannesociety.org/science-init...
October 23, 2025 at 2:47 PM
Graduate students, have you heard the news? The Orianne Society’s Grant Program for Reptile and Amphibian Conservation in the Southeast is now accepting applications!
Application deadline: 5PM EST, 21 November 2025
Scan QR code or follow link for details: www.oriannesociety.org/science-init...
Application deadline: 5PM EST, 21 November 2025
Scan QR code or follow link for details: www.oriannesociety.org/science-init...
Reposted by Caleb Krueger
Dr. Jenkins sits down with Drs. Eric Hileman and Meaghan Clark for an in-depth look at the Eastern Massasauga. Their studies reveal concerning levels of inbreeding, which are linked to reduced survival and lower breeding rates.
October 11, 2025 at 1:07 PM
Dr. Jenkins sits down with Drs. Eric Hileman and Meaghan Clark for an in-depth look at the Eastern Massasauga. Their studies reveal concerning levels of inbreeding, which are linked to reduced survival and lower breeding rates.
Now out in the September issue of @journal-evo.bsky.social!
- Pop-level thresholds between male/female development (Tpiv) correlate with mean incubation temps among species, but temp variability within species
- Threshold variation within pops (TRT) is more complex and confounded by study design
- Pop-level thresholds between male/female development (Tpiv) correlate with mean incubation temps among species, but temp variability within species
- Threshold variation within pops (TRT) is more complex and confounded by study design
Proofs are up for my latest pub in @journal-evo.bsky.social! It’s a big ol’ analysis of how sex-ratio reaction norms vary with local climates within and among turtle species with TSD. Check it out here:
doi.org/10.1093/evol...
doi.org/10.1093/evol...
The tortoise and the air: climate shapes sex-ratio reaction norm variation in turtles
Abstract. For some species, gonadal sex determination relies on environmental cues and thus ought to match local conditions, which can be accomplished thro
doi.org
October 8, 2025 at 3:52 PM
Now out in the September issue of @journal-evo.bsky.social!
- Pop-level thresholds between male/female development (Tpiv) correlate with mean incubation temps among species, but temp variability within species
- Threshold variation within pops (TRT) is more complex and confounded by study design
- Pop-level thresholds between male/female development (Tpiv) correlate with mean incubation temps among species, but temp variability within species
- Threshold variation within pops (TRT) is more complex and confounded by study design
Reposted by Caleb Krueger
Attention graduate students! The Orianne Society’s Grant Program for Reptile and Amphibian Conservation in the Southeast is now accepting applications.
Application deadline: 5PM EST, 21 November 2025
Scan QR code or follow this link for details: www.oriannesociety.org/science-init...
Application deadline: 5PM EST, 21 November 2025
Scan QR code or follow this link for details: www.oriannesociety.org/science-init...
October 7, 2025 at 4:23 PM
Attention graduate students! The Orianne Society’s Grant Program for Reptile and Amphibian Conservation in the Southeast is now accepting applications.
Application deadline: 5PM EST, 21 November 2025
Scan QR code or follow this link for details: www.oriannesociety.org/science-init...
Application deadline: 5PM EST, 21 November 2025
Scan QR code or follow this link for details: www.oriannesociety.org/science-init...
Despite how often I’ve had a spotted turtle retract its head and thought “Wow, that thing is really tucked away!”, I somehow don’t have a picture of it to share. But apparently that neck skin has evolved to be thick and protective and now it has a name: the clemmysian fold!
doi.org/10.1038/s415...
doi.org/10.1038/s415...
Anatomical and histological analysis of an undescribed cervical skin fold structure in spotted turtles (Clemmys gutatta) - Scientific Reports
Turtles evolved over 230 million years ago during the Triassic period, and are a group of ectothermic reptiles that can be found everywhere in the world except Antarctica. There are approximately...
doi.org
August 13, 2025 at 2:36 PM
Despite how often I’ve had a spotted turtle retract its head and thought “Wow, that thing is really tucked away!”, I somehow don’t have a picture of it to share. But apparently that neck skin has evolved to be thick and protective and now it has a name: the clemmysian fold!
doi.org/10.1038/s415...
doi.org/10.1038/s415...
A wee thing helped across the road today. I think this is the smallest wild box turtle I’ve ever seen - just hatched last fall!
August 10, 2025 at 8:37 PM
A wee thing helped across the road today. I think this is the smallest wild box turtle I’ve ever seen - just hatched last fall!
Haven’t practiced photography in a while, but Mooney was a cooperative enough model while I quickly reminded myself how a flash works
August 3, 2025 at 12:33 AM
Haven’t practiced photography in a while, but Mooney was a cooperative enough model while I quickly reminded myself how a flash works
Hey #JMIH2025, interested in temperature-dependent sex determination? Come to my talk at 1:30 today, right at the beginning of session 18!
July 11, 2025 at 1:17 PM
Hey #JMIH2025, interested in temperature-dependent sex determination? Come to my talk at 1:30 today, right at the beginning of session 18!
Proofs are up for my latest pub in @journal-evo.bsky.social! It’s a big ol’ analysis of how sex-ratio reaction norms vary with local climates within and among turtle species with TSD. Check it out here:
doi.org/10.1093/evol...
doi.org/10.1093/evol...
The tortoise and the air: climate shapes sex-ratio reaction norm variation in turtles
Abstract. For some species, gonadal sex determination relies on environmental cues and thus ought to match local conditions, which can be accomplished thro
doi.org
June 26, 2025 at 5:41 PM
Proofs are up for my latest pub in @journal-evo.bsky.social! It’s a big ol’ analysis of how sex-ratio reaction norms vary with local climates within and among turtle species with TSD. Check it out here:
doi.org/10.1093/evol...
doi.org/10.1093/evol...
Nothing hits quite like finding a new population of these guys
May 30, 2025 at 1:04 AM
Nothing hits quite like finding a new population of these guys
The duality of turtles
May 15, 2025 at 12:04 AM
The duality of turtles
I’ve only played a small role, but I’m excited to be a part of the revamped Tree of Sex group and to see what’s coming!
Officially (re-)annoucing the Tree of Sex! Read all about it in JEB below!
🔖The Tree of Sex consortium: A global initiative for studying the evolution of reproduction in eukaryotes
Advanced article version👇
academic.oup.com/jeb/advance-...
📖 Read more: treeofsex.sanger.ac.uk
Follow us here 👉 @treeofsex.bsky.social
#TreeOfSex #Evolution #Genomics #Biodiversity
Advanced article version👇
academic.oup.com/jeb/advance-...
📖 Read more: treeofsex.sanger.ac.uk
Follow us here 👉 @treeofsex.bsky.social
#TreeOfSex #Evolution #Genomics #Biodiversity
May 13, 2025 at 12:05 PM
I’ve only played a small role, but I’m excited to be a part of the revamped Tree of Sex group and to see what’s coming!
Reposted by Caleb Krueger
🚨 Cool new project alert 🚨
WE- you, me, everyone- need to work together to get important science messages out to people.
4 artists & 3 scientists collab'd on these posters. We hope YOU will put them out in your community. Each poster comes w/info about each topic.
Get 'em Squidfacts.bigcartel.com
WE- you, me, everyone- need to work together to get important science messages out to people.
4 artists & 3 scientists collab'd on these posters. We hope YOU will put them out in your community. Each poster comes w/info about each topic.
Get 'em Squidfacts.bigcartel.com
May 6, 2025 at 2:26 PM
🚨 Cool new project alert 🚨
WE- you, me, everyone- need to work together to get important science messages out to people.
4 artists & 3 scientists collab'd on these posters. We hope YOU will put them out in your community. Each poster comes w/info about each topic.
Get 'em Squidfacts.bigcartel.com
WE- you, me, everyone- need to work together to get important science messages out to people.
4 artists & 3 scientists collab'd on these posters. We hope YOU will put them out in your community. Each poster comes w/info about each topic.
Get 'em Squidfacts.bigcartel.com
Reposted by Caleb Krueger
New research from our lab exploring the ecological consequences of behavioral syndromes! @morganichemistry.bsky.social shows that antipredator behavior in painted turtles is repeatable and associated with ecologically significant variation in nest site choice.
authors.elsevier.com/c/1k-tHmjMA3pk
authors.elsevier.com/c/1k-tHmjMA3pk
April 28, 2025 at 7:18 PM
New research from our lab exploring the ecological consequences of behavioral syndromes! @morganichemistry.bsky.social shows that antipredator behavior in painted turtles is repeatable and associated with ecologically significant variation in nest site choice.
authors.elsevier.com/c/1k-tHmjMA3pk
authors.elsevier.com/c/1k-tHmjMA3pk
Reposted by Caleb Krueger
Crazy times, but I'll be advertising for a 2 year postdoc to work with me on new comp. methods to estimate evolutionary history soon - specifically to develop methods to handle missing data (e.g. ascertainment bias, allele dropout). Are you a comp. biologist graduating with a PhD soon? Reach out!
a woman talking on a cell phone with the words " i 'd like to offer you a job " below her
ALT: a woman talking on a cell phone with the words " i 'd like to offer you a job " below her
media.tenor.com
April 28, 2025 at 8:24 PM
Crazy times, but I'll be advertising for a 2 year postdoc to work with me on new comp. methods to estimate evolutionary history soon - specifically to develop methods to handle missing data (e.g. ascertainment bias, allele dropout). Are you a comp. biologist graduating with a PhD soon? Reach out!
We’ve reached new records of small in the field recently
April 28, 2025 at 2:29 PM
We’ve reached new records of small in the field recently
One of the biggest and one of the smallest Blanding’s I’ve caught so far! The big one has about 2 decades on the small one
April 24, 2025 at 9:54 PM
One of the biggest and one of the smallest Blanding’s I’ve caught so far! The big one has about 2 decades on the small one
Bumper day for Blanding’s
April 20, 2025 at 10:55 PM
Bumper day for Blanding’s
Today was for 20+ year old Blanding’s
April 19, 2025 at 8:40 PM
Today was for 20+ year old Blanding’s
I know it’s field season when my camera roll starts to look like this:
April 13, 2025 at 10:37 PM
I know it’s field season when my camera roll starts to look like this:
It snowed this morning, but 35 degree water won’t stop spotted turtles from making more spotted turtles!
April 10, 2025 at 10:55 PM
It snowed this morning, but 35 degree water won’t stop spotted turtles from making more spotted turtles!