Sign in

Hannah Sima Rempel

@hannah-rempel.bsky.social
2.7K followers 2.4K following 100 posts

Marine ecologist & PhD student interested in how human impacts reshape marine trophic interactions. (She/her) 🏳️‍🌈🪸 🐟 ⚛️ 🧬 Other interests include: rstats, sciart, educational outreach hannahrempel.weebly.com

PostsRepliesMedia
Hannah Sima Rempel @hannah-rempel.bsky.social · 03/09/2026
Blennies & the Jetty 🐟 Small fishes that inhabit Texas jetties may have surprisingly important roles as links in local food webs between the nutrients and detritus they eat and larger iconic Texas game fishes! @texasscience.bsky.social @utmsi.bsky.social www.portasouthjetty.com/articles/the...
portasouthjetty.com
The Secret lives of Port A’s cryptic fishes - Port Aransas South Jetty
If you’ve ever strolled a long the Port Aransas jetty or paddled past the pier to catch some surf, you’ve likely been watched by hundreds of tiny, tufted eyes from some of our smallest residents! Thes...
021
Hannah Sima Rempel @hannah-rempel.bsky.social · 08/04/2026
7 years ago, I gave my first talk at an R stats conference. At the reception, a man asked me, "Do you use R?" 🙄 My mentor, Dr. Kelly Bodwin, helped me shake off my subsequent feeling that I didn't belong and encouraged my love of statistics. Effective mentorship matters: ojs.elte.hu/cejntrep/art...
Screenshot of a tweet by Hannah Rempel about presenting on using Google Drive with R workflows at SatRDayLA. Two photos show her presenting to an audience, with slides about user-friendly data management and ecological research using R.
1405
Reposted by Hannah Sima Rempel
Woods Hole Oceanographic Institution @whoi.edu · 07/04/2026
❄️ In a new collaborative study, WHOI scientists found that bacteria riding on “marine snow” can break down the minerals that help it sink. That means less carbon may reach long-term storage in the deep ocean. 📲Learn more: go.whoi.edu/eco-snow
0199
Hannah Sima Rempel @hannah-rempel.bsky.social · 10/10/2025
Work with 4-5th graders? Check out our 'Coral Reefs & Our Changing Oceans' 3-part lesson series on OER Commons! 🪸👩‍🏫 Students build a coral reef food web, then explore how human impacts influence it through hands-on group activities! oercommons.org/courseware/l... #TEKS #NGSS #K-12 #teachersky
oercommons.org
4-5th Grade Lesson: Coral Reefs & Our Changing Oceans
This three-part series of 50-minute lessons on 'Coral Reefs & Our Changing Oceans' aligns with Texas Essential Knowledge & Skills Standards for 4-5th Grade Science. It covers: (1) Coral Reefs & their ...
0156
Hannah Sima Rempel @hannah-rempel.bsky.social · 29/08/2025
Great new pub by Pappalardo et al. on taxon-specific BLAST % identity thresholds for DNA #metabarcoding 🧬, with an associated Shiny app for optimized COI thresholds tailored to your data: besjournals.onlinelibrary.wiley.com/doi/full/10.... shiny.si.edu/ebbs_blast_f... #eDNA
besjournals.onlinelibrary.wiley.com
Taxon‐specific BLAST percent identity thresholds for identification of unknown sequences using metabarcoding
The identification of organisms in environmental samples using metabarcoding relies on factors such as taxonomic assignment methods, genetic markers, reference databases and confidence thresholds ...
020
Reposted by Hannah Sima Rempel
Aaron O'Dea @odealab.bsky.social · 01/07/2025
🐠🦈 Just out: In this paper we ask "How has reef trophic structure changed since humans started removing predatory fishes from Caribbean coral reefs?". www.pnas.org/doi/10.1073/... Illustrations @cookedillustrations.com
57539
Reposted by Hannah Sima Rempel
Prof Jenny Rohn @jennyrohn.bsky.social · 11/02/2025
On this celebratory day of women and girls in science, let’s reflect that the US National Science Foundation has put the words “women” and “female” (but not “men” and “male”) on the list of forbidden words that will get your grant slated for the reject bin.
A poster about the national day, 11 Feb
311075
Reposted by Hannah Sima Rempel
Physalia-courses@ONLINE @physaliacourses.bsky.social · 07/02/2025
Today is the last day of our #Metabarcoding in Microbial Ecology course! A huge thank you to our instructors and all the participants for making this week a great learning experience. @fonamental.bsky.social @delcampolab.bsky.social
075
Hannah Sima Rempel @hannah-rempel.bsky.social · 26/01/2025
As part of the ‘24-25 SWIMM program, a group of students from Mexico, Cuba and the US have been helping develop a Report Card of coastal resources of Tabasco. 🇲🇽🇨🇺🇺🇸 Last week, we presented a first draft to collaborators in Villahermosa! This has been an amazing group and project to be a part of! 💕
A group of people smiling in front of a presentation A group of smiling people
060
Hannah Sima Rempel @hannah-rempel.bsky.social · 27/12/2024
How is bat acoustic activity influenced by noise pollution? How do impacts differ between natural sounds and human ones with similar acoustic characteristics? 🦇💧🚗 Learn more in our new open-access publication, led by Ryan Vosbigian: dx.doi.org/10.1002/ecs2...
dx.doi.org
Natural and anthropogenic noise shape bat activity and sonar behavior
As human development has expanded, so has the prevalence of anthropogenic noise, which can interfere with acoustic channels used by wildlife. However, since landscapes contain natural sources of pers....
062
Hannah Sima Rempel @hannah-rempel.bsky.social · 23/12/2024
Just did the last PCR of my PhD and with that, Im done with the last of my lab work! 🧬🧪🎉
2340
Hannah Sima Rempel @hannah-rempel.bsky.social · 22/12/2024
Coral bleaching surveys in Bonaire from 2016-2023 show that last year had the most widespread bleaching and related coral colony mortality. While this is disheartening, focusing on increasing local reef resilience can help buy time to address global climate change. 🪸💪 📖: www.dcbd.nl/reposerver/a...
A bleached Madracis auretenra coral showing completely bleached tissues and some tissue mortality on more sun exposed portions of the coral, and only partial bleaching and no mortality on more shaded areas.
1217
Hannah Sima Rempel @hannah-rempel.bsky.social · 09/12/2024
For folks interested in coral reef ecosystem related research and news, check out the Coralsky feed! 🪸🐠🦀 bsky.app/profile/did:...
media.tenor.com
a picture of a coral reef with the words that 's the coral of the story
ALT: a picture of a coral reef with the words that 's the coral of the story
141
Reposted by Hannah Sima Rempel
Eric Schares @eschares.bsky.social · 18/11/2024
🚨 Preprint! We combine our recent open dataset of #APC prices with the article counts per journal-year from #OpenAlex to estimate how much the academic community has paid in APCs over the last 5 years. A. $8.349 billion ($8.968 B in 2023 USD) $2.5B in 2023 alone. arxiv.org/abs/2407.16551 #metasci
arxiv.org
Estimating global article processing charges paid to six publishers for open access between 2019 and 2023
This study presents estimates of the global expenditure on article processing charges (APCs) paid to six publishers for open access between 2019 and 2023. APCs are fees charged for publishing in some ...
7192147
Hannah Sima Rempel @hannah-rempel.bsky.social · 23/11/2024
Im elated to share that my coral reef piece won the Society for Women in Marine Science art competition! #sciart #stippling
2223
Reposted by Hannah Sima Rempel
Dr. Torrance Hanley @torrancehanley.bsky.social · 18/11/2024
Recognizing and celebrating the many contributions, achievements, and inherent value of LGBTQIA+ community members today and every day! 🧵 of a few papers describing how we can better support 🏳️‍🌈 and 🏳️‍⚧️ individuals in STEM. #QueerInSTEM #LGBTQStemDay
12714
Hannah Sima Rempel @hannah-rempel.bsky.social · 01/11/2024
In 'A framework for training graduate students & campus communities in inclusive teaching', @botanyberit.bsky.social, @scubamelman.bsky.social, Chris Biggs and & I share a tips & resources for formal professional development training in inclusive pedagogy. 🧵(1/4) doi.org/10.1128/jmbe...
A three part panel showing the framework used, including literature discussions and knowledge sharing, expert-led educational workshops, and curriculum development and implementation
1125
Hannah Sima Rempel @hannah-rempel.bsky.social · 01/11/2024
Why do animals eat their own poop—and other animals’ too? It's not just your dog that does it, but fish, moose, and many other creatures! 💩 Learn more in a Nat Geo article by Katarina Zimmer highlighting my research and that other scientists: nationalgeographic.com/animals/arti...
nationalgeographic.com
Why do animals eat their own poop—and other animals’ too?
This natural survival strategy, known as coprophagy, reveals how wildlife makes the most of every available resource.
2131
Hannah Sima Rempel @hannah-rempel.bsky.social · 02/08/2024
Parrotfishes help maintain resilient reefs by grazing algae & cyanobacteria, but some also eat live coral. 🪸 In a new study, we evaluated how parrotfish coral predation intensity varies across gradients in coral cover, diversity, & parrotfish abundance across 4 Caribbean regions: shorturl.at/fjZ22
A princess parrotfish swims over a coral reef with a large Orbicella coral that has several distinctive white parrotfish bite scars on it.
183
Hannah Sima Rempel @hannah-rempel.bsky.social · 02/05/2024
I am honored to receive a Scholar Award given by the International Chapter of the P.E.O. Sisterhood. I am very grateful for this support as I advance in my PhD research on the trophic ecology of nominally herbivorous fishes! @thecaseylab.bsky.social #womeninSTEM
Hannah is diving in Bocas del Toro, Panama. She records the behavior of a fish on an underwater slate. She is surrounded by sponges, corals, sand, and fish.Hannah and her research collaborator Rodnyel smile in front of the Smithsonian Tropical Research Institute 'Instituto Smithsonian' sign in Bocas del Toro, Panama.
4122
Hannah Sima Rempel @hannah-rempel.bsky.social · 24/04/2024
It was a wonderful to share work on 'Developing inclusive teaching frameworks for campus and community STEAM education' by myself, @scubamelman.bsky.social @botanyberit.bsky.social + Dr. Chris Biggs, and hear about projects by other grant teams at the @CTL_UT Teaching & Learning Symposium last week!
Poster for the UT Transformative Teaching and Learning Symposium: Teaching for Neurodivergent Learners showing a woman engaging in a conversation with a group.
021
Reposted by Hannah Sima Rempel
Casey Lab @thecaseylab.bsky.social · 15/04/2024
Amazing performance by the Casey lab at the 52nd Benthic Ecology Meeting! 🧬🐠 Shoot out to @hannah-rempel.bsky.social and @Zoe for winning best presentation awards 🏆#BEM2024
082
Hannah Sima Rempel @hannah-rempel.bsky.social · 19/03/2024
2 years & 2 months later, a stippling drawing I began inspired by a class assignment on "picture an ecosystem" is done! There's something magical to reefs that's always encaptivated me. While Ive never seen the coral triangle myself- the birthplace of reefs, I wanted to capture a bit of that magic.
A stippling drawing of a coral reef in black and white. Below the waves are corals, a turtle, many fish, sponges and other critters. Above the waves a pair of people paddle overhead in a boat.
1153
Hannah Sima Rempel @hannah-rempel.bsky.social · 19/02/2024
Are you a woman or non-binary person studying or working in a marine science field in Texas? Consider joining the Texas Chapter of the Society for Women in Marine Science @txswms.bsky.social! texasswms.wixsite.com/texas-swms #TexasScience #WomeninSTEM #nonbinaryinSTEM
Join the Texas Society of Women in Marine Science (Texas SWMS) if you're passionate about marine science! Membership is open to anyone interested in the field. Become a member by attending at least one meeting or event annually and joining the TX SWMS email list or Slack for updates. Our chapter is committed to inclusivity and does not discriminate based on any characteristic. Discrimination within the chapter is not tolerated. Join us in shaping the future of marine science in Texas! JOIN ON OUR WEBSITE OR SEND US A MESSAGE VIA EMAIL OR SOCIAL MEDIA! texasswms@gmail.com texasswms.wixsite.com/texas-swms
01610
Hannah Sima Rempel @hannah-rempel.bsky.social · 25/01/2024
For folks learning to use General Additive (Mixed) Models in R, this free guide by the Quebec Center for Biodiversity Science has been a great resource for me! r.qcbs.ca/workshop08/b... #statistics #GAM #GAMM #academicsky #statsky
051
Reposted by Hannah Sima Rempel
Cédric Scherer @cedricscherer.com · 30/12/2023
A few days before Christmas, Posit shared all talks & workshop materials from posit::conf 2023! I had the honor to teach two 1-day courses—the dedicated web pages feature slides, scripts & exercises👇 2️⃣ "Engaging and Beautiful DataVizes with ggplot2" posit-conf-2023.github.io/dataviz-ggpl...
An open-peeps version of myself with heart eyes and a laptop with the hex logo for my course "Engaging and Beautiful Data Visualizations with ggplot2" on a magenta-orange background with a sketched skyline of Chicago and the posit conf logo next to it.
0132
Hannah Sima Rempel @hannah-rempel.bsky.social · 18/12/2023
I am elated and incredibly grateful to receive a 2024 UT Austin Stengl-Wyer Graduate Fellowship! This will support another year of my PhD research investigating the ecological roles of nominally herbivorous fishes in Panamá and Texas using molecular techniques. 🪸🐠🧬 #TexasScience #womeninstem
Hannah Rempel and Rodnyel Arosemena López smile while sitting on a Smithsonian boat in Bocas del Toro Panamá after a day of field sampling for coral reef researchHannah Rempel is wearing a lab coat, glasses, and gloves while holding a sample tube in a fume hood and smiling. In the background, Juan Pablo Lozano Peña is smiling while pipetting, also in lab attire.
081
Hannah Sima Rempel @hannah-rempel.bsky.social · 14/12/2023
It’s been incredible to spend the past two weeks assisting on projects on Tropical Eastern Pacific reefs and see the other side of the isthmus of Panamá!
A woman free dives over a coral reef with many fishA blue sail boat sits in calm water with part of the photo below the waves
082
Hannah Sima Rempel @hannah-rempel.bsky.social · 08/11/2023
I’m elated to receive a UT Texas Gulf Coast Research Center Predoctoral Award & dive into some new research on Texas fish! Mariana Rivera Higueras, Juan Pablo Lozano Peña, Mel Niell, & I kicked off this project with fun & successful of field collections & lab work yesterday! @txacsci.bsky.social
Divers Juan Pablo and Mel smile at the surface of a coastal Texas channel as they prepare to descend into the water.A colorful blenny sits in a large barnacle against a colorful background.
1155
Hannah Sima Rempel @hannah-rempel.bsky.social · 31/10/2023
Happy Halloween from the University of Texas Marine Science Institute! 🎃 I love being part of such a fun community!
A group of students, postdocs and staff from the University of Texas Marine Science Institute dressed in costume, prom penguins, to mermaids, mushrooms, pirates, witches and more!
010
Reposted by Hannah Sima Rempel
Morten Kam Dahl Dueholm @mkddueholm.bsky.social · 30/10/2023
Time to upgrade your #16S_rRNA V4 primers! Goodbye Parada et al. 2018 and Apprill et al. 2015. Welcome Hu et al. 2023. Greatly improved coverage for #Patescibacteria/CPR with minimal bias on other known taxa. #MicroSky 🦠🧫 www.biorxiv.org/content/10.1...
13022
Hannah Sima Rempel @hannah-rempel.bsky.social · 27/10/2023
No better way to start the day than sampling environmental DNA on the coast at sunrise!
010
Hannah Sima Rempel @hannah-rempel.bsky.social · 26/10/2023
We kicked off our first inclusive teaching journal club at the University of Texas Marine Science Institute today! We discussed how mixed assessment methods can improve gender parity in college bio courses (Cotner & Ballen 2017). Paper link: journals.plos.org/plosone/arti...
journals.plos.org
Can mixed assessment methods make biology classes more equitable?
Many factors have been proposed to explain the attrition of women in science, technology, engineering and math fields, among them the lower performance of women in introductory courses resulting from ...
153
Hannah Sima Rempel @hannah-rempel.bsky.social · 19/10/2023
For all things coral reef related, here's a Coralsky thread! 🪸 bsky.app/profile/did:... #coralsky #marinescience #research #coralreefs #coral #reefs
3218
Reposted by Hannah Sima Rempel
John Majoris, PhD @gobywan.bsky.social · 17/10/2023
The Majoris Lab at TAMU-CC is open and recruiting a PhD student to study intra- and interspecific variation in larval dispersal traits. Full details at: www.johnmajoris.com/graduate-stu... @sicb-dedb.bsky.social
01211
Reposted by Hannah Sima Rempel
Casey Lab @thecaseylab.bsky.social · 05/10/2023
A study led by hannah-rempel.bsky.social found that Caribbean parrotfishes + surgeonfishes regularly eat fish poop, especially that of planktivores! When compared with their food sources, these feces may be a rich nutrient supplement–a fish "vitamin sea"! 🌊 💩 link.springer.com/article/10.1...
062
Reposted by Hannah Sima Rempel
Casey Lab @thecaseylab.bsky.social · 05/10/2023
How do fish get their "daily vitamins" on nutrient-poor coral reefs? One way is by eating poop! 💩 🐟 Several recent studies involving Casey Lab members highlight the important, yet previously underappreciated role of fish poop as a nutrient source for reef critters! #VitaminSea A thread...
2115
Reposted by Hannah Sima Rempel
Mark Rubin @markrubin.bsky.social · 28/09/2023
🚨 Science Resources for BlueSky 🚨 Scientist? Just joined BlueSky? Here’s four resources you might find useful. #AcademicSky 🧪 🧵 (1) A list of over 130 subject-specific feeds. Find posts by others in your area and use the right tags in your posts to get them seen.
docs.google.com
BlueSky Science-Related Feeds
Sheet1 Likes,Name (Click to visit feed),Tags,Contact to ask to be added to contributor list 11,<a href="https://bsky.app/profile/did:plc:ftnzzw4cnon2pzpw7i5m2xu7/feed/aaaiqnkwsgsz6">#AI&HCI</a>,#HCI,...
7288175
Hannah Sima Rempel @hannah-rempel.bsky.social · 29/09/2023
Are you using eDNA or eRNA approaches to study aquatic ecosystems and want to standardize your approaches? A new paper just dropped comparing methods and best practices in this field! 🧬🌊 #eDNA #eRNA #molecularecology @thecaseylab.bsky.social
030
Hannah Sima Rempel @hannah-rempel.bsky.social · 29/09/2023
Yesterday Dr. John Majoris @gobywan.bsky.social of @tamu.bsky.social and I were busy soldering, assembling, and programming a Raspberry Pi (mini computer) to run a motor for an experiment on fish digestion! 🐠💻 Excited to get this experiment running! #TexasScience #UTMSI #TAMUCC
Scientist Dr. John Majoris is soldering a time keeping component for a Raspberry Pi mini-computerA Raspberry Pi hat to run a stepper motor
063
Hannah Sima Rempel @hannah-rempel.bsky.social · 26/09/2023
This is the British Ecological Society HTTP 404 error page... they have truly outdone themselves! While I didn't find the article link I was looking for, I did get a good laugh. 😂
16123
Hannah Sima Rempel @hannah-rempel.bsky.social · 24/09/2023
Wow! This feels surreal to have my art on display at the grand reopening of the Texas Science & Natural History Museum! Thanks for the photo Katy Appler!! #sciart #steam #sciartseptember
060
Hannah Sima Rempel @hannah-rempel.bsky.social · 22/09/2023
Favorite R package discovery of the day... tidyr::crossing() This package is great for making a dataframe that includes all possible unique combinations of 2+ dataframes you are merging, or multiple vectors! #rpackage #stats #rstats #rforecologists
172
Reposted by Hannah Sima Rempel
Simon J. Brandl @gobyone.bsky.social · 04/09/2023
Two weeks left to apply for a graduate student position (oyster reef ecosystems or coral reef ecology) or research technician/lab manager position in my lab! fishandfunctions.com/join Please spread the word & email me for any questions.
054
Reposted by Hannah Sima Rempel
Celtic Karla @celtickarla.bsky.social · 04/09/2023
American Association of University Women (AAUW) American Fellowship Dissertation Fellowship: $25,000 Postdoctoral Research Leave Fellowship: $50,000 Short-Term Research Publication Grant: $8,000 Deadline: Nov 15 www.aauw.org/resources/pr... #neuroscience #neurogrants
aauw.org
American Fellowships
AAUW American Fellowships support women scholars who are completing dissertations, planning research leave from accredited institutions, or preparing research for publication.
13137
Hannah Sima Rempel @hannah-rempel.bsky.social · 04/09/2023
Rodnyel Arosemena López and I have had a busy summer studying how reef degradation influence coral reef fish trophic roles. 🪸🐟🏭 I’m grateful for a Smithsonian Predoctoral Fellowship that is supporting this ongoing work! #fieldwork #smithsonian #panamá #coralreefs
181
Hannah Sima Rempel @hannah-rempel.bsky.social · 02/09/2023
Happy #SciArtSeptember! This illustration of a Molly miller blenny with Dictyota and Caulerpa algae was inspired by my ongoing research. Prints are available for purchase, all proceeds support the Society for Integrative & Comparative Biology student fund! fineartamerica.com/featured/tin...
A molly miller blenny surrounded by algae
0142
Hannah Sima Rempel @hannah-rempel.bsky.social · 31/08/2023
Hey Bluesky! Did you know that Caribbean parrotfishes and surgeonfishes eat fish feces, especially that of planktivores? Our research suggests that these feces may be a rich nutrient supplement–a fish "vitamin sea"! 💩 link.springer.com/article/10.1...
A graphical abstract for a publication on 'Feces consumption by nominally herbivorous fishes in the Caribbean: 
an underappreciated source of nutrients?'. The description reads:

Caribbean reef fishes regularly consume the feces of Brown Chromis, a planktivorous fish. Nearly 85% of observed Brown Chromis fecal pellets were consumed!

>90% of consumed fecal pellets were eaten by parrotfishes and surgeonfishes alone; consumption rates varied by species.
 
Fecal pellets were rich in some macronutrients, such as protein, and some micronutrients, such as phosphorus, compared to other major dietary items.
0142