Marine Biology & Ecology

Hannah Yarbrough

Passionate
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Sixty feet below the surface of Caribbean waters, a large spotted eagle ray glided a few feet from me — and I knew I had found my path.
Hannah Yarbrough in the marine research lab at TAMUCC, holding a sea hare specimen
Hannah Yarbrough sitting beneath a sea turtle mural in Port Aransas
M.S. Marine Biology · TAMUCC '26

Where Science Meets the Sea

I'm a marine biologist and environmental scientist driven by a deep curiosity about the ocean and a commitment to protecting it. With over a decade of combined experience in biology and ecology — from undergraduate environmental studies through biomedical research and a marine biology master's thesis — I bring a rare breadth of scientific training to the coast I call home.

My M.S. thesis at TAMUCC (expected April 2026) investigates psilocybin as a treatment for major depressive disorder, using Aplysia californica — the California sea hare — as a model organism. With its remarkably tractable nervous system of large, identifiable neurons, Aplysia offers a powerful window into the synaptic mechanisms behind psychedelic-assisted therapies. Before turning fully to the sea, I spent over three years as a Staff Research Assistant at the University of Oklahoma Health Sciences Center, contributing to peer-reviewed neuroscience publications.

Outside the lab, I serve as Board Treasurer for the Science Graduate Student Organization at TAMUCC, conduct coastal ecology fieldwork in the Laguna Madre, and volunteer at the AMOS Rehabilitation Keep in Port Aransas, caring for rescued sea turtles under a U.S. FWS permit. I'm also a PADI Rescue Diver with a deep love for the water I study.

3+
Publications
10+
Yrs. Bio & Ecology
PADI
Rescue Diver

Research & Expertise

My work bridges marine biology, ecology, and neuroscience — with a focus on the Texas Gulf Coast and the incredible species that call it home.

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Marine Neurobiology & Thesis Research

M.S. thesis (expected April 2026) uses the California sea hare, Aplysia californica, to study psilocybin's antidepressant mechanisms at the cellular and synaptic level. Aplysia's large, identifiable neurons make it an ideal model for understanding how psychedelic compounds induce neuroplasticity in the context of treatment-resistant depression.

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Coastal Ecosystems

Hands-on field research in the Texas Gulf Coast's unique environments — including vegetation transect studies on Laguna Madre spoil islands, seagrass ecology, and estuarine biodiversity. Passionate about the ecological gradients that shape hypersaline lagoons, barrier islands, and nearshore marine habitats.

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Sea Turtle Conservation

Authorized by the U.S. Fish & Wildlife Service for Gulf sea turtle stranding and nesting response. Hands-on experience in the care, rehabilitation, and release of loggerhead, green, and Kemp's ridley turtles.

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Biomedical Research

Four years of advanced molecular and cellular laboratory work — immunohistochemistry, confocal microscopy, and biochemical assays — contributing to NIH and VA-funded neuroscience research at OU HSC.

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Environmental Education

Teaching assistant for undergraduate courses including Environmental Science, Environmental Biology, Environmental Laws & Regulations, and Principles of Ecology at TAMUCC.

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Field Science

PADI-certified Rescue Diver, Advanced Open Water, and Open Water Diver — bringing in-water capability to coastal and marine field research. Certified in HAZWOPER 40-Hour and Oil Spill Response.

M.S. Thesis · Expected April 2026

Investigating Psilocybin's Antidepressant Mechanisms Using Aplysia californica

Over 280 million people worldwide suffer from major depressive disorder. Current SSRI treatments take weeks to work and fail for roughly one-third of patients — leaving many with severe, treatment-resistant depression. My thesis investigates psilocybin, designated a "breakthrough therapy" by the FDA in 2018, using the California sea hare (Aplysia californica) as a model organism. This marine gastropod's nervous system — containing ~20,000 large, individually identifiable neurons across 10 ganglia — allows precise microneurosurgical access unavailable in vertebrate models. By mapping how psilocybin acts on serotonin receptors and drives synaptic plasticity in Aplysia, this work builds a cellular foundation for understanding how psychedelic-assisted therapy may one day offer fast-acting relief where conventional antidepressants fall short.

Advisor: Dr. Riccardo Mozzachiodi Texas A&M University Corpus Christi Department of Life Sciences

Experience & Background

A multidisciplinary career spanning marine biology, biomedical research, and conservation — always driven by a commitment to rigorous science and environmental stewardship.

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Aug 2023 — Present
Graduate Teaching & Research Assistant
Texas A&M University Corpus Christi · Corpus Christi, TX
  • Teaching lab sections for Environmental Science, Environmental Biology, Ecology, and Environmental Laws & Regulations
  • M.S. thesis: using Aplysia californica (California sea hare) to study psilocybin's antidepressant mechanisms via microneurosurgery and neurophysiological data collection
  • Conducted vegetation transect field research on Laguna Madre spoil islands, studying elevation gradients and plant community structure in this rare hypersaline lagoon ecosystem
  • Board Treasurer, Science Graduate Student Organization (Fall 2024–Present)
  • Recipient of the Thomas & Susan Shirley Graduate Student Travel Endowed Scholarship in Marine Sciences
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Jan 2025 — Present
Volunteer
AMOS Rehabilitation Keep · Port Aransas, TX
  • Ongoing volunteer supporting animal care, rehabilitation, and daily operations at the UT Marine Science Institute's wildlife facility
  • Work conducted under USFWS permit ES830177
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May 2025 — Nov 2025 (Seasonal Staff)
Animal Attendant
AMOS Rehabilitation Keep · Port Aransas, TX
  • Listed on U.S. FWS List of Authorized Individuals for Gulf sea turtle stranding and nesting season
  • Fed, administered medicine, and provided daily care to captive and rescued marine animals
  • Certified to perform X-Rays and ultrasounds on rescued sea turtles and other wildlife
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Jan 2020 — Jul 2023
Staff Research Assistant
University of Oklahoma Health Sciences Center · Oklahoma City, OK
  • Executed complex molecular and cellular laboratory techniques for neuroscience research
  • Supervised and trained other technicians on protocols, procedures, and safety
  • Contributed to data collection, analysis, and methodology for peer-reviewed publications
  • Facilitated the awarding of a VA-funded Pilot Grant
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Mar 2019 — Jan 2020
Animal Care Technician
Oklahoma Medical Research Foundation · Oklahoma City, OK
  • Provided care to a variety of laboratory animals with detailed reporting per departmental SOPs
  • Trained other technicians in animal care operations and husbandry procedures
Hannah Yarbrough holding a rescued sea turtle at AMOS Rehabilitation Keep
Hannah Yarbrough with a large loggerhead sea turtle at AMOS
Wild sea turtle swimming through sargassum in the Gulf of Mexico

AMOS Rehabilitation Keep

The Animal Rehabilitation Keep (ARK) at Port Aransas, Texas, is one of the Gulf Coast's most important marine wildlife rehabilitation facilities. Operated by the University of Texas Marine Science Institute, AMOS ARK cares for injured and stranded sea turtles, birds, and other marine wildlife with the goal of recovery and release back into the wild.

I began volunteering at AMOS in January 2025 and continue to do so today. During the 2025 sea turtle stranding season (May–November), I also held a paid staff position as an Animal Attendant — administering medications, performing daily health assessments, conducting X-Rays and ultrasounds, and providing hands-on care to animals ranging from small juvenile green turtles to adult loggerheads.

U.S. FWS Authorized: Listed on the U.S. Fish & Wildlife Service's List of Authorized Individuals for Gulf sea turtle stranding and nesting season — enabling legal work with federally protected species under the Endangered Species Act. All sea turtle work conducted under USFWS permit ES830177.
Visit AMOS Rehabilitation Keep

Publications

Contributing to the scientific literature on neurological aging, cognitive function, and mitochondrial biology.

2023
Cognitive heterogeneity reveals molecular signatures of age-related impairment
Logan S, Baier MP, Owen DB, Peasari J, Jones KL, Ranjit R, Yarbrough HP, Masingale AM, Bhandari S, Rice HC, Kinter MT, Sonntag WE
PNAS Nexus, Volume 2, Issue 4, April 2023
doi: 10.1093/pnasnexus/pgad101 ↗
2023
A Genetically Heterogeneous Rat Model with Divergent Mitochondrial Genomes
Sathiaseelan R, Ahn B, Stout MB, Logan S, Wanagat J, Nguyen HV, Hord NG, Vandiver AR, Selvarani R, Ranjit R, Yarbrough HP, Masingale AM, Miller BF, Wolf RF, Austad SN, & Richardson A
The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, 78, 771–779
2022
Selective ablation of Sod2 in astrocytes induces sex-specific effects on cognitive function, D-serine availability, and astrogliosis
Baier MP, Nagaraja RY, Yarbrough HP, Owen DB, Masingale AM, Ranjit R, Stiles MA, Murphy A, Agbaga M-P, Ahmad M, Sherry DM, Kinter MT, Van Remmen H, & Logan S
The Journal of Neuroscience
doi: 10.1523/jneurosci.2543-21.2022 ↗

Certifications & Skills

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PADI
Rescue Diver
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PADI
Advanced Open Water Diver
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PADI
Swim School Instructor
☣️
AALAS
Animal Biosafety Training & Biocontainment
⚗️
CITI
Lab Hazard Communication & Research Safety
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CITI
Working with the IACUC
NSCS
HAZWOPER 40-Hour
🛢️
NSCS
Oil Spill Prevention & Response 40-Hour

Leadership & Community

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Board Treasurer

Science Graduate Student Organization · TAMUCC · Fall 2024–Present

Serving on the board of the Science Graduate Student Organization at Texas A&M Corpus Christi, supporting graduate students in marine and environmental science disciplines.

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P2P Symposium Selectee

Pathways to Profession · Tarleton State University · February 2025

Competitively selected to present at the Pathways to Profession (P2P) Symposium at Tarleton State University, showcasing research to a multidisciplinary scientific audience.

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Graduate Travel Scholar

Thomas & Susan Shirley Endowed Scholarship · TAMUCC

Recipient of the Thomas and Susan Shirley Graduate Student Travel Endowed Scholarship in Marine Sciences, supporting participation in conferences and professional development.

Gulf Coast Marine News

Live updates from NOAA Fisheries, Texas Sea Grant, and Texas Parks & Wildlife — covering the latest in marine biology, ecology, and conservation along the Texas Gulf Coast.

NOAA Fisheries Texas Sea Grant TPWD
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Let's Connect

Interested in collaboration, research opportunities, or marine biology conversations? I'd love to hear from you.