Rachel Holser
@rachelholser.bsky.social
She/Her Research Scientist at UC Santa Cruz studying marine heatwaves and northern elephant seal foraging behavior, habitat use, and reproductive success.
Pinned
Rachel Holser
@rachelholser.bsky.social
· Dec 19
Two decades of three-dimensional movement data from adult female northern elephant seals - Scientific Data
Scientific Data - Two decades of three-dimensional movement data from adult female northern elephant seals
www.nature.com
Over 5 years of writing code, collating metadata, processing, QCing, reprocessing, QCing, reprocessing…… not to mention the weeks, months, & years of field work by a small army of researchers. I am SO excited that we’re sharing this incredible dataset. 👉 www.nature.com/articles/s41...
Reposted by Rachel Holser
I don't think anyone outside of universities, pharma and biotech, independent research institutions have any idea of what is happening right now. If you haven't sounded the alarm among your friends, family and colleagues, now is the time to do it.
May 31, 2025 at 11:25 AM
I don't think anyone outside of universities, pharma and biotech, independent research institutions have any idea of what is happening right now. If you haven't sounded the alarm among your friends, family and colleagues, now is the time to do it.
Have a listen about some of the work I’ve been assisting the amazing @drmichellelarue.bsky.social with this last year! 🦭🐧🧊
Really grateful to Dr. Claire Concannon for covering our research on Voices of the Sea Ice
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www.rnz.co.nz/news/ourchan...
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www.rnz.co.nz/news/ourchan...
Voice of the Sea Ice: More life!
Do penguins and seals share nicely in Antarctica?
www.rnz.co.nz
March 31, 2025 at 1:14 AM
Have a listen about some of the work I’ve been assisting the amazing @drmichellelarue.bsky.social with this last year! 🦭🐧🧊
Reposted by Rachel Holser
Excellent paper by @chrismcknight.bsky.social ! Congratulations! 🦭
Cognitive perception of circulating oxygen in seals is the reason they don’t drown | Science www.science.org/doi/10.1126/...
Cognitive perception of circulating oxygen in seals is the reason they don’t drown | Science www.science.org/doi/10.1126/...
Cognitive perception of circulating oxygen in seals is the reason they don’t drown
Marine mammals rely on maintaining sufficient blood oxygen levels while diving to prevent drowning. Generally, oxygen is cognitively imperceptible to mammals that instead sense rising carbon dioxide a...
www.science.org
March 21, 2025 at 2:57 PM
Excellent paper by @chrismcknight.bsky.social ! Congratulations! 🦭
Cognitive perception of circulating oxygen in seals is the reason they don’t drown | Science www.science.org/doi/10.1126/...
Cognitive perception of circulating oxygen in seals is the reason they don’t drown | Science www.science.org/doi/10.1126/...
Reposted by Rachel Holser
If you didn’t already know that Rochelle Constantine is a total badass, check out this footage and you will see. They got drone and underwater views of it?! Incredible.
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March 22, 2025 at 1:37 AM
If you didn’t already know that Rochelle Constantine is a total badass, check out this footage and you will see. They got drone and underwater views of it?! Incredible.
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Reposted by Rachel Holser
Happy Monday! This is a good time to remind you that grey seal pups display high individual variability in their movement patterns during their first year at sea - Look where these guys have been. The things they must have seen! #PinnipedFacts 🦭
March 17, 2025 at 3:18 PM
Happy Monday! This is a good time to remind you that grey seal pups display high individual variability in their movement patterns during their first year at sea - Look where these guys have been. The things they must have seen! #PinnipedFacts 🦭
Reposted by Rachel Holser
For the full statement, please visit the Society for Marine Mammalogy's webpage: marinemammalscience.org/diversity-in...
#SMM #marinemammalscience #missionstatement
#SMM #marinemammalscience #missionstatement
March 11, 2025 at 1:13 AM
For the full statement, please visit the Society for Marine Mammalogy's webpage: marinemammalscience.org/diversity-in...
#SMM #marinemammalscience #missionstatement
#SMM #marinemammalscience #missionstatement
Reposted by Rachel Holser
🚨New paper out!
By migrating between productive high latitude and oligotrophic regions (Great Baleen Conveyor Belt) large whales 🐋 transport incredible amounts of nutrients to low latitudes @jjkiszka.bsky.social @andrewabraham.bsky.social @dancosta2025.bsky.social
www.nature.com/articles/s41...
By migrating between productive high latitude and oligotrophic regions (Great Baleen Conveyor Belt) large whales 🐋 transport incredible amounts of nutrients to low latitudes @jjkiszka.bsky.social @andrewabraham.bsky.social @dancosta2025.bsky.social
www.nature.com/articles/s41...
Migrating baleen whales transport high-latitude nutrients to tropical and subtropical ecosystems - Nature Communications
Baleen whales migrate from high latitude feeding grounds to subtropical reproductive winter grounds, translocating limiting nutrients across ecosystems. This study estimates the latitudinal movement o...
www.nature.com
March 10, 2025 at 8:59 PM
🚨New paper out!
By migrating between productive high latitude and oligotrophic regions (Great Baleen Conveyor Belt) large whales 🐋 transport incredible amounts of nutrients to low latitudes @jjkiszka.bsky.social @andrewabraham.bsky.social @dancosta2025.bsky.social
www.nature.com/articles/s41...
By migrating between productive high latitude and oligotrophic regions (Great Baleen Conveyor Belt) large whales 🐋 transport incredible amounts of nutrients to low latitudes @jjkiszka.bsky.social @andrewabraham.bsky.social @dancosta2025.bsky.social
www.nature.com/articles/s41...
Reposted by Rachel Holser
Every US scientist needs to 100% clear that this is a fundamental attack on the process of science itself. If allowed to stand it will be the end of US science as we know it. Staying quiet because it does not (yet) target your work is not an option.
www.nature.com/articles/d41...
www.nature.com/articles/d41...
Exclusive: NIH to terminate hundreds of active research grants
Studies that touch on LGBT+ health, gender identity and DEI in the biomedical workforce could be terminated, according to documents obtained by Nature.
www.nature.com
March 6, 2025 at 12:33 PM
Every US scientist needs to 100% clear that this is a fundamental attack on the process of science itself. If allowed to stand it will be the end of US science as we know it. Staying quiet because it does not (yet) target your work is not an option.
www.nature.com/articles/d41...
www.nature.com/articles/d41...
Reposted by Rachel Holser
**Antarctic POST-DOC announcement incoming!**
Sarah Flanagan, Jong-U Kim, Jeong-Hoon Kim & I are teaming up to study population genomics of emperor penguins in the Ross Sea. 20-month position available, will inform the Ross Sea MPA review. Join us in NZ! 🧪🌍🦑🦉
flanagan-lab.github.io/people/open-...
Sarah Flanagan, Jong-U Kim, Jeong-Hoon Kim & I are teaming up to study population genomics of emperor penguins in the Ross Sea. 20-month position available, will inform the Ross Sea MPA review. Join us in NZ! 🧪🌍🦑🦉
flanagan-lab.github.io/people/open-...
Open Positions
I am currently seeking a postdoc to study population genetics in emperor penguins!
flanagan-lab.github.io
February 28, 2025 at 3:27 AM
**Antarctic POST-DOC announcement incoming!**
Sarah Flanagan, Jong-U Kim, Jeong-Hoon Kim & I are teaming up to study population genomics of emperor penguins in the Ross Sea. 20-month position available, will inform the Ross Sea MPA review. Join us in NZ! 🧪🌍🦑🦉
flanagan-lab.github.io/people/open-...
Sarah Flanagan, Jong-U Kim, Jeong-Hoon Kim & I are teaming up to study population genomics of emperor penguins in the Ross Sea. 20-month position available, will inform the Ross Sea MPA review. Join us in NZ! 🧪🌍🦑🦉
flanagan-lab.github.io/people/open-...
Reposted by Rachel Holser
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February 26, 2025 at 7:35 AM
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Reposted by Rachel Holser
Reposted by Rachel Holser
Protecting the ocean has always been a bipartisan effort, in Congress and across multiple White House administrations. In the face of ill-conceived attacks on @noaa.gov, it's time to raise our voices. My thoughts in defense of NOAA and #OceanScience: mbayaq.co/4k8vEsx
February 25, 2025 at 6:14 PM
Protecting the ocean has always been a bipartisan effort, in Congress and across multiple White House administrations. In the face of ill-conceived attacks on @noaa.gov, it's time to raise our voices. My thoughts in defense of NOAA and #OceanScience: mbayaq.co/4k8vEsx
Reposted by Rachel Holser
That’s our bird!!! He’s been hanging around there for more than a month, I wondered when someone would spot him.
This is Juju, named by my other nephew.
Thank you Bluesky friends for getting this to me, how very cool!
🧪🌎🦑🦉
This is Juju, named by my other nephew.
Thank you Bluesky friends for getting this to me, how very cool!
🧪🌎🦑🦉
Let’s see if the Bluesky mindhive can help track this beauty down… we found a satellite tagged Emperor Penguin today on the fast ice in McMurdo Sound, Ross Sea. Anyone know who might have tagged it? #Seabirds #Penguins @theseabirdgroup.bsky.social @scar-antarctic.bsky.social
January 21, 2025 at 5:25 PM
That’s our bird!!! He’s been hanging around there for more than a month, I wondered when someone would spot him.
This is Juju, named by my other nephew.
Thank you Bluesky friends for getting this to me, how very cool!
🧪🌎🦑🦉
This is Juju, named by my other nephew.
Thank you Bluesky friends for getting this to me, how very cool!
🧪🌎🦑🦉
Reposted by Rachel Holser
🚨 New review on lunar cycle effects on #tuna 🐟, #billfish 🐟, #sharks 🦈 & #rays with @sammy-shark.bsky.social & others! 🚨
🌑 🌒 🌓 🌔 🌕 🌖 🌗 🌘 🌑
We reviewed 190 studies that showed animals moved deeper with increasing lunar illumination. Check out our paper for best practices!
doi.org/10.1007/s111...
🌑 🌒 🌓 🌔 🌕 🌖 🌗 🌘 🌑
We reviewed 190 studies that showed animals moved deeper with increasing lunar illumination. Check out our paper for best practices!
doi.org/10.1007/s111...
December 19, 2024 at 9:39 PM
🚨 New review on lunar cycle effects on #tuna 🐟, #billfish 🐟, #sharks 🦈 & #rays with @sammy-shark.bsky.social & others! 🚨
🌑 🌒 🌓 🌔 🌕 🌖 🌗 🌘 🌑
We reviewed 190 studies that showed animals moved deeper with increasing lunar illumination. Check out our paper for best practices!
doi.org/10.1007/s111...
🌑 🌒 🌓 🌔 🌕 🌖 🌗 🌘 🌑
We reviewed 190 studies that showed animals moved deeper with increasing lunar illumination. Check out our paper for best practices!
doi.org/10.1007/s111...
Reposted by Rachel Holser
🚨 New Paper Alert 🚨
We put decades of effort in collecting this massive dataset on movement and diving behaviour of northern elephant seals and now we make it available! 🦭🦑🌎
Check it out here 👉
www.nature.com/articles/s41...
We put decades of effort in collecting this massive dataset on movement and diving behaviour of northern elephant seals and now we make it available! 🦭🦑🌎
Check it out here 👉
www.nature.com/articles/s41...
Two decades of three-dimensional movement data from adult female northern elephant seals - Scientific Data
Scientific Data - Two decades of three-dimensional movement data from adult female northern elephant seals
www.nature.com
December 18, 2024 at 9:44 PM
🚨 New Paper Alert 🚨
We put decades of effort in collecting this massive dataset on movement and diving behaviour of northern elephant seals and now we make it available! 🦭🦑🌎
Check it out here 👉
www.nature.com/articles/s41...
We put decades of effort in collecting this massive dataset on movement and diving behaviour of northern elephant seals and now we make it available! 🦭🦑🌎
Check it out here 👉
www.nature.com/articles/s41...
Over 5 years of writing code, collating metadata, processing, QCing, reprocessing, QCing, reprocessing…… not to mention the weeks, months, & years of field work by a small army of researchers. I am SO excited that we’re sharing this incredible dataset. 👉 www.nature.com/articles/s41...
Two decades of three-dimensional movement data from adult female northern elephant seals - Scientific Data
Scientific Data - Two decades of three-dimensional movement data from adult female northern elephant seals
www.nature.com
December 19, 2024 at 12:41 AM
Over 5 years of writing code, collating metadata, processing, QCing, reprocessing, QCing, reprocessing…… not to mention the weeks, months, & years of field work by a small army of researchers. I am SO excited that we’re sharing this incredible dataset. 👉 www.nature.com/articles/s41...
Reposted by Rachel Holser
Success! Our fearless leader @drmichellelarue.bsky.social, along with @rachelholser.bsky.social deployed all 10 tags on Weddell seals in the Ross Sea! Photo by Dan Costa. NMFS permit #25770
November 26, 2024 at 8:23 AM
Success! Our fearless leader @drmichellelarue.bsky.social, along with @rachelholser.bsky.social deployed all 10 tags on Weddell seals in the Ross Sea! Photo by Dan Costa. NMFS permit #25770
Reposted by Rachel Holser
New Weddell seal project alert! Led by @drmichellelarue.bsky.social and a great team including @rachelholser.bsky.social and Dan Costa, our field team has put out 6 sat tags on 🦭 from Eastern Ross Sea to understand what they do between breeding and moulting - Keep checking this space for updates
November 20, 2024 at 9:48 AM
New Weddell seal project alert! Led by @drmichellelarue.bsky.social and a great team including @rachelholser.bsky.social and Dan Costa, our field team has put out 6 sat tags on 🦭 from Eastern Ross Sea to understand what they do between breeding and moulting - Keep checking this space for updates
Reposted by Rachel Holser
It's another historic year in the #Antarctic. With ice growth remaining slow (austral winter), the magnitude of the Antarctic sea ice departure is almost as anomalous as last year's record. Wow.
Full seasonal cycle graphs available at zacklabe.com/antarctic-se....
Full seasonal cycle graphs available at zacklabe.com/antarctic-se....
July 17, 2024 at 12:09 PM
It's another historic year in the #Antarctic. With ice growth remaining slow (austral winter), the magnitude of the Antarctic sea ice departure is almost as anomalous as last year's record. Wow.
Full seasonal cycle graphs available at zacklabe.com/antarctic-se....
Full seasonal cycle graphs available at zacklabe.com/antarctic-se....
Reposted by Rachel Holser
🚨🚨New Paper 🚨 🚨 Rockstar scientist @sarahelendil23 leads this amazing study showing how foraging and age of elephant seals 🦭 moms affect transfer of mercury to the pups www.nature.com/articles/s41... 🦭🌎🧪
Foraging behavior and age affect maternal transfer of mercury to northern elephant seal pups - Scientific Reports
Scientific Reports - Foraging behavior and age affect maternal transfer of mercury to northern elephant seal pups
www.nature.com
February 27, 2024 at 8:05 AM
🚨🚨New Paper 🚨 🚨 Rockstar scientist @sarahelendil23 leads this amazing study showing how foraging and age of elephant seals 🦭 moms affect transfer of mercury to the pups www.nature.com/articles/s41... 🦭🌎🧪
Reposted by Rachel Holser
SCIENCE FACT: There is no animal in the world that looks funnier with a telemetry tracker on its head than a seal
We are tagging southern elephant 🦭 with CTD (Conductivity-Temperature-Depth) and CTDF (Fluorometer) tags to better understand the poorly-known oceanography of the fjords in this remote area of the planet #AnilloSEALS 🌎🦑🧪
February 8, 2024 at 8:19 PM
SCIENCE FACT: There is no animal in the world that looks funnier with a telemetry tracker on its head than a seal
Reposted by Rachel Holser
It has been.... a long time... since I've posted a #penguinpicoftheday, #PPOTD, so here you go folks, a BUNCH of king penguins for your viewing pleasure also did you know they are roughly half the size of emperor penguins
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February 23, 2024 at 12:32 AM
It has been.... a long time... since I've posted a #penguinpicoftheday, #PPOTD, so here you go folks, a BUNCH of king penguins for your viewing pleasure also did you know they are roughly half the size of emperor penguins
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Reposted by Rachel Holser
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MAMMOLOGIST JOB IN CALIFORNIA!
Permanent, decently paid, unionized job. PhD not required. Based in Sacramento.
Happy to answer what questions I can
calcareers.ca.gov/CalHrPublic/...
Permanent, decently paid, unionized job. PhD not required. Based in Sacramento.
Happy to answer what questions I can
calcareers.ca.gov/CalHrPublic/...
February 22, 2024 at 12:43 AM
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