Jon Kuntz, PhD 🦈
@sharkeye.bsky.social
Shark eyes and stable isotopes | Lecturer UC Merced | Alaska Department of Fish & Game 🦀 | AK Sea Grant State Fellow | (He/Him)
Pinned
Jon Kuntz, PhD 🦈
@sharkeye.bsky.social
· Sep 22
Hi bsky sci community! I’m new here, so here’s a Sharky introduction! I’m an ecologist interested in understanding shark movement, diet, and population dynamics in the San Francisco Bay! Hope you’ll join me on this new app journey 🌎 🦈 🫶🏻
Reposted by Jon Kuntz, PhD 🦈
Beneath the surface: a deep dive into the behaviour and interactions of elasmobranchs in a tropical South Atlantic archipelago 🦑🌿🐟🦈 link.springer.com/article/10.1...
Beneath the surface: a deep dive into the behaviour and interactions of elasmobranchs in a tropical South Atlantic archipelago - Environmental Biology of Fishes
Sharks and rays face significant population declines due to overfishing, habitat degradation, and climate change. Their behavioural patterns, such as feeding, territoriality, and interactions with oth...
link.springer.com
December 19, 2025 at 12:39 PM
Beneath the surface: a deep dive into the behaviour and interactions of elasmobranchs in a tropical South Atlantic archipelago 🦑🌿🐟🦈 link.springer.com/article/10.1...
This is where I live!
🧪🛰️🌍🌊💨🧊
#highlatitudedust activity today in the Copper river delta in #Alaska.
Nice successive views of the event by VIIRS-NOAA21/20/SNPP it gives an appreciation of the plume evolution with details that GOES can't match.
Very cloudy , difficult scene and webcams nearby were not operating.
#highlatitudedust activity today in the Copper river delta in #Alaska.
Nice successive views of the event by VIIRS-NOAA21/20/SNPP it gives an appreciation of the plume evolution with details that GOES can't match.
Very cloudy , difficult scene and webcams nearby were not operating.
December 17, 2025 at 6:45 AM
This is where I live!
Reposted by Jon Kuntz, PhD 🦈
In my first Editorial as Associate Editor for @conphysjournal.bsky.social, we help combat this lack of training by providing some "tips and tricks" for writing constructive peer reviews, based on our collective experiences as editors for multiple scientific journals.
Tips and tricks for writing constructive peer reviews
Peer review has been the cornerstone of scientific inquiry for centuries and is considered the backbone of scientific quality and rigour (Spier, 2002). Des
academic.oup.com
December 15, 2025 at 12:53 PM
In my first Editorial as Associate Editor for @conphysjournal.bsky.social, we help combat this lack of training by providing some "tips and tricks" for writing constructive peer reviews, based on our collective experiences as editors for multiple scientific journals.
Reposted by Jon Kuntz, PhD 🦈
After taking (too) many pictures of scales we finally have our new study out: Identifying escaped farmed salmon from scales using deep learning: academic.oup.com/biomethods/a...
The model works well and covers the major Atlantic salmon rivers in Norway. Could be adpated to other fish and places!
The model works well and covers the major Atlantic salmon rivers in Norway. Could be adpated to other fish and places!
December 8, 2025 at 2:28 PM
After taking (too) many pictures of scales we finally have our new study out: Identifying escaped farmed salmon from scales using deep learning: academic.oup.com/biomethods/a...
The model works well and covers the major Atlantic salmon rivers in Norway. Could be adpated to other fish and places!
The model works well and covers the major Atlantic salmon rivers in Norway. Could be adpated to other fish and places!
Reposted by Jon Kuntz, PhD 🦈
Huzzah! After a lot of work, I'm happy to share that the results of my first chapter have been published and are available for your perusal. In this paper, I was interested in understanding how characteristics of urban environments influence the diel activity of cats academic.oup.com/jue/article/...
Housing proximity and vegetation cover affect diel activity patterns of domestic cats (Felis catus) in regionally protected shorelines
Abstract. Free-roaming domestic cats (Felis catus) are among the most impactful non-native species globally, causing the extinction of 63 endemic vertebrat
academic.oup.com
December 3, 2025 at 3:36 AM
Huzzah! After a lot of work, I'm happy to share that the results of my first chapter have been published and are available for your perusal. In this paper, I was interested in understanding how characteristics of urban environments influence the diel activity of cats academic.oup.com/jue/article/...
Reposted by Jon Kuntz, PhD 🦈
New pre-print with @psmaldino.bsky.social on an agent-based model of propaganda in online spaces.
Using the voter model from physics, we simulate networks with stubborn agents (zealots) who do not change their opinions, asking about their optimal positioning for influencing the network.
Using the voter model from physics, we simulate networks with stubborn agents (zealots) who do not change their opinions, asking about their optimal positioning for influencing the network.
December 1, 2025 at 10:31 AM
New pre-print with @psmaldino.bsky.social on an agent-based model of propaganda in online spaces.
Using the voter model from physics, we simulate networks with stubborn agents (zealots) who do not change their opinions, asking about their optimal positioning for influencing the network.
Using the voter model from physics, we simulate networks with stubborn agents (zealots) who do not change their opinions, asking about their optimal positioning for influencing the network.
Reposted by Jon Kuntz, PhD 🦈
Inter-method differences (SIMS vs. IRMS) in oxygen isotope fractionation: insights from Chinook salmon otoliths #stableisotopes www.sciencedirect.com/science/arti...
Inter-method differences (SIMS vs. IRMS) in oxygen isotope fractionation: insights from Chinook salmon otoliths
Stable oxygen isotopes (δ18O) in biogenic carbonates serve as a valuable proxy for reconstructing thermal history. Fish otoliths (ear stones) are part…
www.sciencedirect.com
November 26, 2025 at 11:05 PM
Inter-method differences (SIMS vs. IRMS) in oxygen isotope fractionation: insights from Chinook salmon otoliths #stableisotopes www.sciencedirect.com/science/arti...
Reposted by Jon Kuntz, PhD 🦈
Fine‐scale reconstruction of pelagic fish migration by iso‐logging of eye lens - Matsubayashi - Methods in Ecology and Evolution #stableisotopes besjournals.onlinelibrary.wiley.com/doi/full/10....
Fine‐scale reconstruction of pelagic fish migration by iso‐logging of eye lens
Understanding lifetime space use by pelagic animals is pivotal for ecology and fisheries management, but electronic tags are costly, labour-intensive and rarely able to capture juvenile movement. ...
besjournals.onlinelibrary.wiley.com
November 23, 2025 at 11:53 AM
Fine‐scale reconstruction of pelagic fish migration by iso‐logging of eye lens - Matsubayashi - Methods in Ecology and Evolution #stableisotopes besjournals.onlinelibrary.wiley.com/doi/full/10....
Reposted by Jon Kuntz, PhD 🦈
New paper where we explore how the dynamics of food webs can be explored when populations are ‘distilled’ to high and low states, or Boolean switches… Somehow this leads to a discussion involving Otodus megalodon :D
nsojournals.onlinelibrary.wiley.com/doi/10.1002/...
nsojournals.onlinelibrary.wiley.com/doi/10.1002/...
Distilling food web dynamics: top–down and bottom–up drivers of extinction and trophic cascades
Quantifying population dynamics is a fundamental challenge in ecology and evolutionary biology, particularly for species that are cryptic, microscopic, or extinct. Traditional approaches rely on cont...
nsojournals.onlinelibrary.wiley.com
November 15, 2025 at 1:10 AM
New paper where we explore how the dynamics of food webs can be explored when populations are ‘distilled’ to high and low states, or Boolean switches… Somehow this leads to a discussion involving Otodus megalodon :D
nsojournals.onlinelibrary.wiley.com/doi/10.1002/...
nsojournals.onlinelibrary.wiley.com/doi/10.1002/...
Reposted by Jon Kuntz, PhD 🦈
So delighted to have worked with Drs Christine France and Julianne Sarancha on this project. With deer samples, we created isoscapes (Sr, O, and S) for the state of Virginia.
Potentially hella useful for archaeology in the region. 🏺🧪 www.tandfonline.com/doi/full/10....
Potentially hella useful for archaeology in the region. 🏺🧪 www.tandfonline.com/doi/full/10....
www.tandfonline.com
November 17, 2025 at 10:14 PM
So delighted to have worked with Drs Christine France and Julianne Sarancha on this project. With deer samples, we created isoscapes (Sr, O, and S) for the state of Virginia.
Potentially hella useful for archaeology in the region. 🏺🧪 www.tandfonline.com/doi/full/10....
Potentially hella useful for archaeology in the region. 🏺🧪 www.tandfonline.com/doi/full/10....
Reposted by Jon Kuntz, PhD 🦈
"We found that despite the enormous spatial range of data, both pPOM and sPOM became 2.1‰ and 2.2‰ more 13C-depleted per decade, respectively, with parallel decreases in the δ13C values in consumers"
journals.plos.org/plosone/arti...
journals.plos.org/plosone/arti...
Trophic niche variation across the pan-Arctic coastal continuum
We analyzed stable carbon and nitrogen isotope values (δ13C and δ15N, respectively) for pan-Arctic coastal primary producers and consumers to detect large-scale regional trends both temporally and spa...
journals.plos.org
November 6, 2025 at 4:49 PM
"We found that despite the enormous spatial range of data, both pPOM and sPOM became 2.1‰ and 2.2‰ more 13C-depleted per decade, respectively, with parallel decreases in the δ13C values in consumers"
journals.plos.org/plosone/arti...
journals.plos.org/plosone/arti...
Reposted by Jon Kuntz, PhD 🦈
The earliest appearance of gigantic lamniform #sharks has now been pushed back by ~15 Ma (upper Aptian, ~115 Ma) with the discovery of enormous cardabiodontid shark remains from northern Australia.🦈🧪
www.nature.com/articles/s42...
www.nature.com/articles/s42...
Early gigantic lamniform marks the onset of mega-body size in modern shark evolution - Communications Biology
The earliest appearance of mega-body size in sharks is pushed back by 15 million years with the discovery of new fossils from Northern Australia. Using a comprehensive dataset of living sharks to esti...
www.nature.com
October 27, 2025 at 11:38 PM
The earliest appearance of gigantic lamniform #sharks has now been pushed back by ~15 Ma (upper Aptian, ~115 Ma) with the discovery of enormous cardabiodontid shark remains from northern Australia.🦈🧪
www.nature.com/articles/s42...
www.nature.com/articles/s42...
Reposted by Jon Kuntz, PhD 🦈
New #sharkscience from Hilary Lewis and others:
Challenging traditional methods of age estimation: elemental and isotopic characterisation of speartooth shark Glyphis glyphis vertebrae.
www.int-res.com/abstracts/me...
@iucnshark.bsky.social @austsocfishbiol.bsky.social @mickgrant.bsky.social
Challenging traditional methods of age estimation: elemental and isotopic characterisation of speartooth shark Glyphis glyphis vertebrae.
www.int-res.com/abstracts/me...
@iucnshark.bsky.social @austsocfishbiol.bsky.social @mickgrant.bsky.social
www.int-res.com
October 17, 2025 at 1:25 PM
New #sharkscience from Hilary Lewis and others:
Challenging traditional methods of age estimation: elemental and isotopic characterisation of speartooth shark Glyphis glyphis vertebrae.
www.int-res.com/abstracts/me...
@iucnshark.bsky.social @austsocfishbiol.bsky.social @mickgrant.bsky.social
Challenging traditional methods of age estimation: elemental and isotopic characterisation of speartooth shark Glyphis glyphis vertebrae.
www.int-res.com/abstracts/me...
@iucnshark.bsky.social @austsocfishbiol.bsky.social @mickgrant.bsky.social
Reposted by Jon Kuntz, PhD 🦈
Does tidal marsh #restoration "work", if the goal is bringing back key species AND the trophic interactions that support them? A thousand stable isotope samples later, we have answers! 💯 work by PhD student Megan Pagliaro:
esajournals.onlinelibrary.wiley.com/doi/10.1002/... #SanFrancisco #BayDelta
esajournals.onlinelibrary.wiley.com/doi/10.1002/... #SanFrancisco #BayDelta
Does tidal marsh restoration lead to the recovery of trophic pathways that support estuarine fishes?
Evaluation of tidal marsh restoration success is typically based on the recovery of habitat size and target species. However, food-web structure may provide valuable insight into ecosystem functionin...
esajournals.onlinelibrary.wiley.com
October 12, 2025 at 2:14 PM
Does tidal marsh #restoration "work", if the goal is bringing back key species AND the trophic interactions that support them? A thousand stable isotope samples later, we have answers! 💯 work by PhD student Megan Pagliaro:
esajournals.onlinelibrary.wiley.com/doi/10.1002/... #SanFrancisco #BayDelta
esajournals.onlinelibrary.wiley.com/doi/10.1002/... #SanFrancisco #BayDelta
Reposted by Jon Kuntz, PhD 🦈
“It actually doesn’t take much to be considered a difficult woman. That’s why there are so many of us.”
― Jane Goodall
💙 RIP to a real one. My childhood hero
― Jane Goodall
💙 RIP to a real one. My childhood hero
October 2, 2025 at 2:56 AM
“It actually doesn’t take much to be considered a difficult woman. That’s why there are so many of us.”
― Jane Goodall
💙 RIP to a real one. My childhood hero
― Jane Goodall
💙 RIP to a real one. My childhood hero
Reposted by Jon Kuntz, PhD 🦈
A landmark scientific workshop has identified 124 Important Shark and Ray Areas (ISRAs) across the European Atlantic, providing the first comprehensive map of critical habitats for threatened species such as Basking Shark, Tope, Spiny Dogfish, Sicklefin Devil Ray, and Angelshark.
September 23, 2025 at 8:41 AM
A landmark scientific workshop has identified 124 Important Shark and Ray Areas (ISRAs) across the European Atlantic, providing the first comprehensive map of critical habitats for threatened species such as Basking Shark, Tope, Spiny Dogfish, Sicklefin Devil Ray, and Angelshark.
Reposted by Jon Kuntz, PhD 🦈
One like, one clam fact
One like, one opinion about how to solve climate change.
1 like, 1 housing opinion
July 22, 2025 at 3:18 AM
One like, one clam fact
Foraged this King Bolete (Porcini) yesterday!
For dinner made a porcini pappardelle (pasta with and olive oil, parsley, and garlic sauce) and porcini carpaccio (raw porcini with parmesan and olive oil) 🤤
For dinner made a porcini pappardelle (pasta with and olive oil, parsley, and garlic sauce) and porcini carpaccio (raw porcini with parmesan and olive oil) 🤤
September 19, 2025 at 4:22 AM
Foraged this King Bolete (Porcini) yesterday!
For dinner made a porcini pappardelle (pasta with and olive oil, parsley, and garlic sauce) and porcini carpaccio (raw porcini with parmesan and olive oil) 🤤
For dinner made a porcini pappardelle (pasta with and olive oil, parsley, and garlic sauce) and porcini carpaccio (raw porcini with parmesan and olive oil) 🤤
News story on some of my PhD work…
caseagrant.ucsd.edu/news/shark-e...
caseagrant.ucsd.edu/news/shark-e...
Shark eyes tell tales
caseagrant.ucsd.edu
September 16, 2025 at 5:40 PM
News story on some of my PhD work…
caseagrant.ucsd.edu/news/shark-e...
caseagrant.ucsd.edu/news/shark-e...
This made me really happy today
September 15, 2025 at 11:46 PM
This made me really happy today
Can you name the four kinds of mushrooms my partner and I found foraging today? 🍄
August 25, 2025 at 8:20 AM
Can you name the four kinds of mushrooms my partner and I found foraging today? 🍄
The silvers are coming through!
August 24, 2025 at 2:40 AM
The silvers are coming through!
Reposted by Jon Kuntz, PhD 🦈
I finally did it. My first chapter is FINALLY written and out for all to see. If you’ve attended my talks you 100% know what this is about. If you haven’t attended my talks, shark nostrils are more interesting than we thought. Enjoy! academic.oup.com/icb/advance-...
Who Nose What Flows: Shark Narial Denticle Morphology and Hydrodynamic Implications
Synopsis. Dermal denticles (scales) are important in influencing the movement of water around a shark’s body. To date, most of the research on denticle mor
academic.oup.com
August 20, 2025 at 3:22 PM
I finally did it. My first chapter is FINALLY written and out for all to see. If you’ve attended my talks you 100% know what this is about. If you haven’t attended my talks, shark nostrils are more interesting than we thought. Enjoy! academic.oup.com/icb/advance-...
Grades turned in! First time being the instructor on record was challenging but really enjoyed it @ucmerced.bsky.social
August 19, 2025 at 5:21 PM
Grades turned in! First time being the instructor on record was challenging but really enjoyed it @ucmerced.bsky.social
I’m now in the desk rejection club! 🤩
August 15, 2025 at 10:42 PM
I’m now in the desk rejection club! 🤩