Digital Commons Network^™

Action This Day: The Mathematics And Machinations That Bested The German Enigma, Jonah Weinbaum

Dartmouth College Master’s Theses

This thesis presents a comprehensive and chronological overview of cryptographic techniques designed to break Enigma, beginning in 1932 and culminating in the creation of the Turing-Welchman Bombe. We discuss the mathematical theory and electromechanical implements used to decode one of history's greatest ciphers.

Reexamining the Bombe through the lens of modern group theory, we critique Alan Turing's estimation of the number of "stops" that the Bombe produces for various plaintext-ciphertext pairing structures. To address its limitations, we introduce a new framework for estimating the number of stops by extending John Dixon's theorem concerning the probability that uniformly distributed elements of …

Paleomagnetic Assessment Of The Appekunny And Greyson Fms., Lower Belt Supergroup, Montana, Usa., Olivia C. Moehl

Dartmouth College Master’s Theses

The Belt Supergroup of the northwestern United States is one of the most extensive Mesoproterozoic sedimentary successions in North America. Although certain stratigraphic units have been well studied, correlations across the entire outcrop region remain unresolved. This project uses magnetostratigraphy and lithostratigraphy to investigate a potential lateral equivalency between the 1.4 billion-year-old (Ga) Appekunny Formation (Fm.) in Glacier National Park, MT and the 1.4 Ga Greyson Fm. in the Helena Embayment, MT. Both formations consist predominantly of shallow-water mudstones and contain the only North American occurrences of Horodyskia moniliformis, one of the oldest known macrofossils. Paleomagnetic analyses were conducted on …

Aestheticizing And Engendering Disease: The Case Of Tuberculosis, Abigail Dollries

Dartmouth College Master’s Theses

This thesis examines how tuberculosis, known in the nineteenth century as “consumption,” was aestheticized in American cultural and medical discourse, particularly in industrial cities of the North between 1830 and 1850. It addresses the paradox at the heart of the disease’s representation: while tuberculosis was medically pathologized, it was simultaneously romanticized, especially when afflicting elite white women. The central problem explored is how this aestheticization of illness functioned to reinforce gender, class, and racial hierarchies by transforming suffering into a symbol of virtue, refinement, and social status. Using a cultural-historical methodology, this project analyzes a range of sources, including medical …

Application Of Person-Centered Therapy To Educator Preparation For Relationships With Families, James M. Mcginn

Journal of Excellence in College Teaching and Learning

This article examines the importance of preparing future educators for effective partnerships with students’ families, a priority emphasized in contemporary educator standards. Despite evidence that strong educator-parent relationships foster academic and socio-emotional growth, many educators feel ill-equipped to engage with families confidently. Drawing upon the field of school counseling, this paper explores how concepts and pedagogies from counseling— particularly Person-Centered Therapy (PCT)—can inform educator preparation. The article provides an overview of the school counseling profession, reviews the foundational principles of PCT, and discusses how these approaches can be integrated into higher education curricula. By adopting non-directive, relationship-centered strategies rooted in …

Patient-Centric Federated Learning: Automating Meaningful Consent To Health Data Sharing With Smart Contracts, Kristin M Kostick-Quenet, Marcelo Corrales Compagnucci, Mateo Aboy, Timo Minssen

Center for Medical Ethics and Health Policy Staff Publications

Federated Learning (FL) promises to enhance data-driven health research by enabling collaborative machine learning across distributed datasets without direct data exchange. However, current FL implementations primarily reflect the data-sharing interests of institutional controllers rather than those of individual patients whose data are at stake. Existing consent mechanisms-like broad consent under HIPAA or explicit consent under the GDPR-fail to provide patients with control over how their data is used. This article explores the integration of smart contracts (SCs) into FL as a mechanism for automating, enforcing, and documenting consent in data transactions. SCs, encoded in decentralized ledger technologies, can ensure that …

Adolescent And Caregiver Preparation For Legal Changes At Age 18, Blanca Sanchez-Fournier, Jordyn Babla, Mary Majumder, Beth H Garland, Constance M Wiemann, Albert C Hergenroeder

Center for Medical Ethics and Health Policy Staff Publications

Background: Most adolescents with special healthcare needs (ASHCN) will assume legal responsibility for making decisions about their medical treatment at age 18. Simultaneously, parents or other legal representatives (Caregivers) will lose ASHCN medical record access. This study examined ASHCN and Caregiver knowledge of, satisfaction with, and suggestions for improvement in preparing for these changes.

Methods: Eighty-three dyads (18-year-old ASHCN and Caregivers) completed an assessment to evaluate their knowledge about changes in responsibility for decision making with a focus on consent, satisfaction with the preparation received, and recommendations for improved preparation. Descriptive statistics and mean comparisons were used. Responses to open-ended …

Deep Brain Stimulation For Childhood Treatment-Resistant Obsessive-Compulsive Disorder: Mental Health Clinician Views On Candidacy Factors, Ilona Cenolli, Tiffany A Campbell, Natalie Dorfman, Meghan Hurley, Jared N Smith, Kristin Kostick-Quenet, Eric A Storch, Jennifer Blumenthal-Barby, Gabriel Lázaro-Muñoz

Center for Medical Ethics and Health Policy Staff Publications

Introduction: Deep brain stimulation (DBS) is approved under a humanitarian device exemption to manage treatment-resistant obsessive-compulsive disorder (TR-OCD) in adults. It is possible that DBS may be trialed or used clinically off-label in children and adolescents with TR-OCD in the future. DBS is already used to manage treatment-resistant childhood dystonia. Evidence suggests it is a safe and effective intervention for certain types of dystonia. Important questions remain unanswered about the use of DBS in children and adolescents with TR-OCD, including whether mental health clinicians would refer pediatric patients for DBS, and who would be a good candidate for DBS.

Objectives: …

“They're Like Slash”: Multimodality And Embodied Agency In Students' Critical Engagements With Texts, María José Aragón, Meghan Corella, Nora W. Lang

Faculty Research, Scholarly, and Creative Activity

Despite recent calls to more fully incorporate multimodal perspectives into literacies research, there is still limited scholarship examining how students critically engage in reading activities by drawing on embodied practices. Racially and linguistically minoritized students are particularly disadvantaged by dominant logocentric and developmentalist approaches, which privilege oral and written discourse and often position these students as less capable of performing complex literacy practices. Drawing from three independent ethnographic studies, our multimodal interactional analysis examines how students of a range of ages and raciolinguistic backgrounds use embodied actions and other semiotic resources to agentively navigate text, task, and ideological constraints in …

Assessing Total Mortality Following Seabird Wrecks Given Variable Data Quantity And Quality: The Cassin’S Auklet Die-Off, Timothy Jones, Julia K. Parrish, Parker Maccready, Lisa T. Ballance, David W. Bradley, Hillary K. Burgess, Jane E. Dolliver, James T. Harvey, Trevor Joyce, Kirsten Lindquist, Jacqueline Lindsey, Hannahrose M. Nevins, Jan Roletto, Laurie Wilson, Charlie Wright

Faculty Research, Scholarly, and Creative Activity

Mass mortality events (MMEs) of seabirds are becoming more frequent as the global climate warms. Often documented via beached bird surveys, methods for estimating event-wide mortality are needed that can accommodate regional differences in carcass deposition and data quality/quantity. We develop a framework for estimating mortality from beached bird counts, extending existing approaches through the novel application of ocean circulation modeling to assess beaching likelihood. We applied our framework to the 2014/15 Cassin’s auklet (Ptychoramphus aleuticus) MME, which spread across three regions (central California, northern California-through-Washington, British Columbia) with varying data quality/quantity. Our best mortality estimate of ∼400 000 (estimates …

Cross-Species Real-Time Detection Of Trends In Pupil Size Fluctuation, Sharif I. Kronemer, Victoria E. Gobo, Catherine R. Walsh, Joshua B. Teves, Diana C. Burk, Somayeh Shahsavarani, Javier Gonzalez-Castillo, Peter A. Bandettini

Faculty Research, Scholarly, and Creative Activity

Pupillometry is a popular method because pupil size is easily measured and sensitive to central neural activity linked to behavior, cognition, emotion, and perception. Currently, there is no method for online monitoring phases of pupil size fluctuation. We introduce rtPupilPhase—an open-source software that automatically detects trends in pupil size in real time. This tool enables novel applications of real-time pupillometry for achieving numerous research and translational goals. We validated the performance of rtPupilPhase on human, rodent, and monkey pupil data, and we propose future implementations of real-time pupillometry.

Different Responses Involving Tfh Cells Delay Parasite-Specific Antibody Production In Trypanosoma Cruzi Acute Experimental Models, Ana Carolina Leão, Maria Jose Villar, Rakesh Adhikari, Cristina Poveda, Leroy Versteeg, Gregório Almeida, Peter J Hotez, Maria Elena Bottazzi, Kathryn M Jones

Center for Medical Ethics and Health Policy Staff Publications

Introduction: Chagas disease (CD), caused by the parasite Trypanosoma cruzi, affects millions globally. Despite treatment options in the acute phase, most infections progress to a chronic indeterminate form or develop severe cardiac/gastrointestinal complications. Understanding the immune response is crucial for the development of vaccines and more efficient drugs for the disease control.

Methods: This work investigates the immune response to T. cruzi H1 K68 strain infection in female BALB/c and C57BL/6 mice to characterize differences in Tfh and B cell responses that may be involved in the poor parasite-specific antibody production during acute infection. For this, mice were euthanized …

Values In Academe: Examining Productivity For Faculty Of Color, Emi Kamei, Young K. Kim, David Edens

Journal of Excellence in College Teaching and Learning

Using a quantitative research design, this study examined two productivity-related outcomes, scholarly productivity and community-minded engagement practices, and how these vary for faculty of color in U.S. higher education institutions among different racial/ethnic subgroups. This study utilized data collected from the 2016-2017 Faculty Survey administered by the Higher Education Research Institute at the University of California, Los Angeles, and a sample of 26,410 faculty members nationwide. The findings suggest that scholarly productivity tends to increase when faculty have spent time writing research grants or have protected time available for research scholarship, and tends to decrease when higher teaching loads are …

On Minimizing Risk And Harm In The Use Of Psychedelics, Jules Evans, Marc Aixalà, Brian T Anderson, William Brennan, Rebecka Bremler, Joost J Breeksema, Lisa Burback, Abigail E Calder, Robin L Carhart-Harris, Katherine Cheung, Neşe Devenot, Ingmar Gorman, Jakub Greń, Peter S Hendricks, Brian Holoyda, Edward Jacobs, Joy Krecké, Daniel J Kruger, David Luke, Tomislav Majić, Amy L Mcguire, Nicky J Mehtani, David S Mathai, Kristin Nash, Tehseen Noorani, Roman Palitsky, Oliver C Robinson, Otto Simonsson, Elin Stahre, Michiel Van Elk, David B Yaden

Center for Medical Ethics and Health Policy Staff Publications

Objective: This article outlines recommendations from 30 psychedelic researchers on how to create a better psychedelic safety net.

Methods: A survey of 30 psychedelic researchers asked them to identify key critical research gaps around psychedelic harm and safety.

Results: The critical research gaps identified by the authors included defining the main types of psychedelic harm, the predictors of those harms, and the most effective way to treat those harms. They also call for better support for those experiencing post-psychedelic difficulties, including better online information, peer support groups, affordable therapy, and psychiatric consultation and medication. Finally, the authors call for better …

All Things To All People: Identifying Factors Influencing Superintendent Salary, Kevin Hub, George Gill Hunter

Journal of Excellence in College Teaching and Learning

This research investigates the factors influencing superintendent salaries in Kentucky, focusing on the linear relationship between seven independent variables and superintendent salary. These variables include student enrollment, average teacher salary, total number of certified staff, per pupil assessment, student poverty, student disability, and student achievement. The study utilized data from 169 Kentucky public school districts during the 2022-2023 school year, collected from various public sources like the Kentucky Department of Education (KDE). The primary method of analysis was the Pearson correlation coefficient, which examined the strength and direction of the relationship between each independent variable and superintendent salary. This study …

Transforming Online Courses: Practical Strategies For Educators, Jacqueline A. Gilbert, Kelly G. Manix, Kristie A. Abston

Journal of Excellence in College Teaching and Learning

In this article, we examine strategies for enhancing student engagement in online higher education courses through targeted course restructuring. Given the increased demand for high-quality online learning, it is essential for institutions to adopt a proactive, student-focused approach to course design and delivery. The paper highlights research underscoring the critical connection between active student participation in online courses and improved academic performance. It emphasizes the fundamental need for strategic organization and consistent course design to foster engagement and optimize student learning. Our research explores the value of soliciting and implementing student feedback through multiple mechanisms, including pre-term and midterm surveys, …

Moving Beyond Simplistic Research Design In Health Professions Education: What A One-Group Pretest-Posttest Design Will Not Prove, S Beth Bierer, Gary Beck Dallaghan, Nicole J Borges, Sam Brondfield, Cha Chi Fung, Kathryn N Huggett, Cayla R Teal, Satid Thammasitboon, Colleen Y Colbert

Center for Medical Ethics and Health Policy Staff Publications

Introduction: Educational research presents unique study design challenges. Novice researchers in health professions education (HPE) frequently misuse the one-group pretest-posttest design, highlighting the need for improved training in research design. This workshop aimed to enhance understanding of research design among novice HPE researchers, specifically addressing the inherent limitations of the one-group pretest-posttest design and offering alternative approaches.

Methods: Experienced HPE researchers developed this workshop to address common misunderstandings of research design. Leaders from the AAMC Medical Education, Scholarship, Research, and Evaluation section facilitated 60-75-minute workshops conducted at the four 2024 regional meetings hosted by the AAMC Group on Educational Affairs …

Investigative Genetic Genealogy Practices Warranting Policy Attention: Results Of A Modified Policy Delphi, Christi J Guerrini, Louiza Kalokairinou, Jill O Robinson, Whitney Bash Brooks, Stephanie M Fullerton, Sara Huston, Jacklyn Dahlquist, Diana Madden, Norah Crossnohere, Nicola Campoamor, John F P Bridges, Amy L Mcguire

Center for Medical Ethics and Health Policy Staff Publications

A technique known as investigative genetic genealogy (IGG) was first introduced to criminal investigations in 2018, and it has since been used by U.S. law enforcement to help identify hundreds of criminal perpetrators and unidentified human remains. As expertise in IGG grows, policymakers have shown interest in regulating it. To help inform these efforts and to promote coherence in IGG governance as it expands, we recruited experts representing a spectrum of IGG-relevant professions and perspectives to identify and prioritize IGG practices for policy attention and to develop policy options for addressing them. In two rounds of a modified policy Delphi, …

A Hybrid Cloud Data Lake Architecture Supporting The Integration Of Clinical And Genomics Data, Apollo Mcowiti, Heidi Dowst, Fei Zheng, Susan Hilsenbeck, Christopher Amos

Center for Medical Ethics and Health Policy Staff Publications

Objective: Cancer centers must quickly integrate clinical genomics data from different vendors for oncology operations and research. Clinical data warehouse architectures are costly to construct and brittle, and they are not readily amenable to the rapid changes in oncology research. We introduce a cost-effective hybrid cloud Data Lake architecture for storing clinical genomic data from different vendors, aiding both clinical and research workflows.

Methods: We created a Data Lake architecture based on the zone architecture, with four layers: ingestion, storage, transformation, and interaction. The layers are implemented with a hybrid cloud architecture. Rich metadata created from patient and genomic data …

A Landscape Analysis Of Psychedelic Retreat Organizations Advertising Online, Logan Neitzke-Spruill, Caroline S Beit, Jill Oliver Robinson, Nikita Singh, Srijith Kambala, Rishi Ramesh, Amy L Mcguire

Center for Medical Ethics and Health Policy Staff Publications

Research into psychedelics' clinical potential has corresponded to a growth in public interest and adult use. One common pathway to accessing psychedelics is through psychedelic retreats. While individual retreats have been characterized in the anthropological literature, no systematic evaluation of the psychedelic retreat industry exists. Assessing the characteristics of the psychedelic retreat industry is critical to understanding the associated ethical, legal, and social implications and ensuring consumer safety. To this end, we conducted a landscape analysis of online, publicly available information to capture and characterize a broad range of organizations offering psychedelic retreats and marketing to English-speaking consumers. From July …

Survivorship From Pediatric And Adult Brain Tumors: The 2024 Brain Tumor Epidemiology Consortium Meeting Report, Scott L Coven, Roberta Mckean-Cowdin, Michael E Scheurer, Kimberly J Johnson, Luc Bauchet, Carol Kruchko, Ching C Lau, Quinn T Ostrom, John Villano, Yan Yuan, Friederike Erdmann

Center for Medical Ethics and Health Policy Staff Publications

The Brain Tumor Epidemiology Consortium (BTEC) is an international organization with membership of individuals from the scientific community with interests related to brain tumor epidemiology, including surveillance, classification, methodology, etiology, and factors associated with morbidity and survival. The 2024 annual BTEC meeting entitled “Survivorship from Pediatric and Adult Brain Tumors” was held in Mainz, Germany, USA, on May 15–17, 2024. The meeting gathered scientists from Africa, Australia, Europe, and North America and included 4 keynote sessions focusing on brain tumor survivorship across the age spectrum. The meeting included 3 abstract sessions, which also included scientific talks around brain …

Reframing Stigma In Tourette Syndrome: An Updated Scoping Review, Kelly Pring, Melina Malli, Brandy W Hardy, Stephen R Rapp, Eric A Storch, Jonathan W Mink, Jaclyn M Martindale

Center for Medical Ethics and Health Policy Staff Publications

Persistent tic disorders (PTD) such as Tourette's syndrome (TS) are common childhood-onset neurodevelopmental disorders. Stigmatization of individuals with these disorders remains an ongoing problem. The purpose of this scoping review is to serve as an updated review of the research regarding stigmatization in youth with PTD since the publication of the original systematic review about this topic in 2016. The electronic databases Embase, Web of Science, PubMed, PsycINFO, and CINAHL were searched. Of the 4751 initial articles screened after removing duplications, 47 studies met the inclusion criteria. The studies were examined under the social-ecological stigmatization model, which helps categorize stigmatization …

When Families Bridge The Research-Clinical Divide: An Exploration Of Values Regarding Cascade Screening In Genomic Research, Katherine E Bonini, Lauren R Desrosiers-Battu, Ann Katherine M Foreman, Nuriye N Sahin-Hodoglugil, Mary A Majumder, Candice R Finnila, Stephanie A Kraft, Laura M Amendola, Eimear E Kenny, Stephanie M Fullerton, Sara L Ackerman, Benjamin S Wilfond, Amy L Mcguire, Hadley Stevens Smith

Center for Medical Ethics and Health Policy Staff Publications

Purpose: Genetic results are important for both patients and their biological relatives. However, cascade screening (CS) uptake is low, especially when testing occurs through research programs and not clinical care. Ethical guidance is needed for CS implementation when individuals receive clinical genetic results through research.

Methods: We conducted focus groups with 3 groups of individuals in the Clinical Sequencing Evidence-Generating Research Consortium: clinicians, patient representatives, and scholars of the ethical, legal, and social implications of genomics. We used inductive thematic and comparative analyses to analyze data within and across the groups.

Results: All participants (n = 27) agreed that …

A Unifying Double-Reference Approach To Semantic Paradoxes: From The White-Horse-Not-Horse Paradox And The Ultimate-Unspeakable Paradox To The Liar Paradox In View Of The Principle Of Noncontradiction, Bo Mou

Faculty Research, Scholarly, and Creative Activity

The purpose of this study is to suggest and explain an engaging approach to three distinct types of (alleged or genuine) semantic paradoxes, the White-Horse-Not-Horse Paradox, the Ultimate-Unspeakable Paradox, and the Liar Paradox, in a unifying way that is sensitive to distinct features of them. Although the three types of semantic paradoxes address distinct types of objects, and although their seemingly paradoxical features are different (alleged or genuine), their distinct structures and contents can be understood and treated on the same common ground, which is jointly conceived in people's pretheoretic understandings of truth and of the double-reference feature of people's …

Leukocyte Infiltration Profiles At The Site Of Intradermal Injection Of Silikon-1000 In Scleroderma-Prone Ucd200/206 And Healthy White Leghorn Chickens, Katee L. Johnson, Jossie M. Santamaria, Chrysta N. Beck, Gisela F. Erf

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Intradermal injections of silicone-based fillers for the face and body may cause chronic inflammation and fibrotic reactions in some individuals. Chickens from the UCD 200/206 White Leghorn (WL) line spontaneously develop a fibrotic autoimmune disease known as scleroderma/systemic sclerosis (SSc). Using the SSc-prone UCD and healthy WL chickens, a longitudinal study was conducted to examine the cellular inflammatory responses to intradermal (i.d.) injections of sterile SILIKON-1000. Specifically, the pulp (a skin derivative) of growing feathers (GFs) was i.d. injected with sterile SILIKON-1000 or phosphate-buffered saline (PBS) as injection control (8 and 3 birds/line, respectively; 10 µL/GF; 20 GFs/bird). Two GFs …

Differences In Cellular And Humoral Immune Responses To A Primary And Secondary Immunization With Herpesvirus Of Turkey (Hvt) Vaccine In Layer Pullets, Allie K. Bowerman, Chrysta N. Beck, Jossie M. Santamaria, Gisela F. Erf

2025 Research Poster Competition

In poultry production, chickens are routinely vaccinated with live herpesvirus vaccines for protection from lymphoma causing Marek’s disease virus. However, information on the immune responses to these vaccines is limited. This study examined cellular and antibody responses to primary and secondary vaccinations with herpesvirus of turkey (HVT). Six unvaccinated 9-wk-old, and six HVT-vaccinated (s.c. at hatch) 19-wk-old, layer pullets received a first (V1) or a second (V2) HVT vaccination, respectively, by intradermal injection of HVT-vaccine into the pulp of growing feathers (GFs; 10 µL/GF; 16 GFs/bird). GFs were collected before (0h), and at 0.25, 1, 2, 3, 5, 7, and …

Collective Liberation Through Critical Pedagogy, Robert A. Marx, Anne E. Dufault, Miriam R. Arbeit

Faculty Research, Scholarly, and Creative Activity

The collective liberation of queer and trans people—which is inherently tied to the liberation of those oppressed by white supremacy and racism, ableism, classism, ageism, and other asymmetrical power distributions—is possible when we develop critical consciousness through critical pedagogy. As young people develop an awareness of the contradictions and falsehoods they are taught (e.g., the myth of meritocracy), they begin to work to change their environments and offer resistance to the structures that inequitably shape their world. The vast majority of research on queer and trans adolescents, though, has been shaped by dominant, deficit-based views of queerness that presuppose that …

Young Audience And Vod Platforms Of Linear Television. Perceptions About Playz, Mtmad And Flooxer, Belén Moreno Albarracín, Tania Blanco Sánchez

Faculty Research, Scholarly, and Creative Activity

Introduction: The new audiovisual paradigm, marked by flexible consumption, a wide catalog and a participatory audience, increases the interest of linear television in connecting with young people. To that end, the channels manage specialized content platforms. This research aims to analyze Mtmad, Playz and Flooxer, and the perceptions about them. The specific objectives are to examine the catalogs; evaluate identification with management chains; analyze youth-content identification and study their consumption habits. Methodology: A content analysis based on web structures and catalogs is proposed; and a survey of 160 young people about their knowledge, identification and consumption patterns. Results: Mtmad leads …

Temporal Patterns Of The Introduced Sponge Hymeniacidon Perlevis (Montagu, 1814) In The Elkhorn Slough, California, Usa, Jackson T. Hoeke, Kerstin Wasson, Amanda S. Kahn

Faculty Research, Scholarly, and Creative Activity

Hymeniacidon perlevis is a cosmopolitan sponge with a seasonal life cycle. We investigated seasonal and interannual dynamics of H. perlevis in Elkhorn Slough estuary, where it is an introduced species, and explored correlations between sponge cover and environmental conditions. We used sponge cover to estimate the potential effects of H. perlevis on its environment, and how those could vary across its seasonal life cycle. We found that recruitment is currently restricted to the upper estuary and while it varies annually, the frequency and density of sponge recruits have generally increased from 2007 to 2023. A seasonal life cycle was confirmed …

Learning About The Transit Passenger Experience From Microblogging Posts, Egbe Etu Etu, Asha Weinstein Agrawal, Jordan Larot, Chaitanya Tatipigari, Imokhai Theophilus Tenebe

Faculty Research, Scholarly, and Creative Activity

Transit agencies often track delays and malfunctions but may overlook riders’ real-time social experiences. To fill this gap, we analyzed 559 tweets from 2020 to 2023 that captured personal accounts of public transport use. Using thematic analysis, we found that 74% of posts criticized other passengers’ behavior, far outweighing comments on transit ride quality, such as complaints about delays (25%). Notably, 86% of tweets expressed negative sentiment, though some highlighted exceptional service. These findings demonstrate that interpersonal dynamics are a key contributor to riders’ experiences and illustrate the nature of the interactions that riders like and dislike.

Evaluating Seasonal Vs. Spatial Extrapolation For Cetacean Distribution Models In The California Current, Elizabeth A. Becker, Karin A. Forney, Bruce J. Thayre, Katherine Whitaker, Ryan Hoopes, Joshua M. Jones, John A. Hildebrand, Jeff Moore

Faculty Research, Scholarly, and Creative Activity

Species distribution models (SDMs) have been developed for multiple cetacean species within the California Current Ecosystem (CCE) from shipboard survey data collected by the Southwest Fisheries Science Center (SWFSC) in summer and fall, thus limiting the ability to inform management decisions in cool seasons when abundance and distribution patterns are substantially different. Winter and spring SDMs have been developed for a few species using California Cooperative Oceanic Fisheries Investigations (CalCOFI) shipboard survey data, but model predictions are limited to the waters off southern and central California. In this study, winter and spring density estimates for the entire CCE study area …