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Articles 31 - 60 of 684
Full-Text Articles in Biology
Effects Of Mating System And Adaptedness On The Evolution Of Fitness And Mtdna Copy Number In Mitonuclear Mismatched C. Elegans, Zachary P. Dietz, Devshuvam Banerji, Jennifer A. Sullins, Brent W. Bever, Stephen F. Christy, Ulfar Bergthorsson, Vaishali Katju, Suzanne Estes
Effects Of Mating System And Adaptedness On The Evolution Of Fitness And Mtdna Copy Number In Mitonuclear Mismatched C. Elegans, Zachary P. Dietz, Devshuvam Banerji, Jennifer A. Sullins, Brent W. Bever, Stephen F. Christy, Ulfar Bergthorsson, Vaishali Katju, Suzanne Estes
Biology Faculty Publications and Presentations
Metabolic functioning in nearly all eukaryotes relies on molecular machinery dual-encoded by mitochondrial DNA (mtDNA) and nuclear DNA (nDNA) genomes. The two genomes have sustained an extraordinary degree of cooperation across evolutionary time, preserving the capacity for indispensable processes including oxidative phosphorylation and ATP production, which in turn influence many fitness-related traits. How this cooperation is maintained when one member of the pair is debilitated by deleterious mutation is poorly understood, as is the influence of mutation location (mtDNA or nDNA), mating system, or the potentially compensatory effects of mtDNA copy number changes on the process. We asked whether and …
The 2 Sigma Genus Concept In Mammalogy: Lessons From Lasiurus, Amy B. Baird, Janet K. Braun, Mark D. Engstrom, Burton K. Lim, Michael A. Mares, Luis A. Ruedas, John C. Patton, John W. Bickham
The 2 Sigma Genus Concept In Mammalogy: Lessons From Lasiurus, Amy B. Baird, Janet K. Braun, Mark D. Engstrom, Burton K. Lim, Michael A. Mares, Luis A. Ruedas, John C. Patton, John W. Bickham
Biology Faculty Publications and Presentations
Species concepts are well established and apply across diverse groups of organisms; however, there is no consensus on what defines higher taxonomic groups. The genus rank is important to taxonomists because it comprises part of the scientific name of an organism. A consistent and biologically meaningful method for determining generic status is needed for taxonomic stability and utility. Lasiurine bats are a group for which there is disagreement on how many genera to recognize. Some authors argue for splitting this group into three genera based on morphology, genetic divergence, and time of divergence; others argue that a single genus should …
Complete Genome Sequence Of Saccharolobus Solfataricus Strain S441, From Lassen Volcanic National Park, Jonathan Abshier, Caleb Marceau, Kenneth Stedman
Complete Genome Sequence Of Saccharolobus Solfataricus Strain S441, From Lassen Volcanic National Park, Jonathan Abshier, Caleb Marceau, Kenneth Stedman
Biology Faculty Publications and Presentations
Here, we present the complete genome sequence Saccharolobus solfataricus strain S441, isolated from Devil’s Kitchen, Lassen Volcanic National Park in Northern California, U.S.A. The genome for this strain is 2,766,550 base pairs, with a GC content of 35.7% and 3,031 genes.
Integrating Methods To Investigate Phytoplankton Dynamics Along Gradients Of A Major Urban River, Nicholas Sheldon
Integrating Methods To Investigate Phytoplankton Dynamics Along Gradients Of A Major Urban River, Nicholas Sheldon
University Honors Theses
Waterways that support human society and life on Earth host superabundant microorganisms which support all ecosystems and food webs: phytoplankton. This study aimed to identify and quantify phytoplankton in the Willamette River in order to understand the dynamics between different phyla. Building on previous studies, which showed that communities of phytoplankton change with the river environment, this work determined how eukaryotic and prokaryotic phytoplankton vary with one another while inhabiting the same river conditions. The approach involved sampling the Willamette river over a weekly time series and combined analytical techniques of qPCR, flow cytometry, and image cytometry to assess population …
Exploring Vaccine Efficacy And Safety For Ms Patients On Immunosuppressant Treatment In Light Of The Covid-19 Pandemic, Rain Pross
University Honors Theses
Multiple sclerosis (MS) is a chronic neurodegenerative autoimmune disorder affecting approximately 2.8 million people worldwide. Despite decades of research to understand the molecular mechanisms of MS pathology, little is known about why the neurodegeneration caused by this illness occurs. For this reason, current treatments for MS target two broader aspects of the disease: relapse management and prevention via disease-modifying therapies. These treatments often involve immunosuppressive mechanisms, creating vulnerability to infectious diseases that became particularly concerning during the COVID-19 pandemic. This literature review examines the safety and efficacy of vaccination for MS patients on immunosuppressant therapies, highlighting the novel mRNA vaccines …
The Aquatic Symbiosis Genomics Project: Probing The Evolution Of Symbiosis Across The Tree Of Life, Matthew Berriman, Victoria Mckenna, Roxanne Beinart, John M. Archibald, Ute Hentschel, Michael N. Dawson, Jose V. Lopez, Patrick J. Keeling, Jillian M. Petersen, Anne W. Thompson, Multiple Addiional Authors
The Aquatic Symbiosis Genomics Project: Probing The Evolution Of Symbiosis Across The Tree Of Life, Matthew Berriman, Victoria Mckenna, Roxanne Beinart, John M. Archibald, Ute Hentschel, Michael N. Dawson, Jose V. Lopez, Patrick J. Keeling, Jillian M. Petersen, Anne W. Thompson, Multiple Addiional Authors
Biology Faculty Publications and Presentations
We present the Aquatic Symbiosis Genomics Project, a global collaboration to generate high quality genome sequences for a wide range of eukaryotes and their microbial symbionts. Launched under the Symbiosis in Aquatic Systems Initiative of the Gordon and Betty Moore Foundation, the ASG Project brings together researchers from across the globe who hope to use these reference genomes to augment and extend their analyses of the dynamics, mechanisms and environmental importance of symbioses. Applying large-scale, high-throughput sequencing and assembly technologies, the ASG collaboration will assemble and annotate the genomes of 500 symbiotic organisms – both the “hosts” and the microbial …
Global Maintenance Of Histone Post-Translational Modifications During The Transition Into Anoxia In Embryos Of The Annual Killifish, Chelsea Hughes, Elizabeth A. Mojica, Dietmar Kültz, Jason E. Podrabsky
Global Maintenance Of Histone Post-Translational Modifications During The Transition Into Anoxia In Embryos Of The Annual Killifish, Chelsea Hughes, Elizabeth A. Mojica, Dietmar Kültz, Jason E. Podrabsky
Biology Faculty Publications and Presentations
Many organisms have adapted to survive anoxic or hypoxic environments, but the epigenetic responses involved in this successful stress response are not well described in most species. Embryos of the annual killifish have the greatest tolerance to anoxia of all vertebrates, making them a powerful model to study the cellular mechanisms necessary for anoxia tolerance. However, the global histone landscape of this species has never been quantified or explored in relation to stress tolerance. Liquid chromatography-mass spectrometry and a Python bioinformatics workflow were used to identify histones and their post-translational modifications. This pipeline resulted in the detection of 252 unique …
Endemism Shapes Viral Ecology And Evolution In Globally Distributed Hydrothermal Vent Ecosystems, Marguerite V. Langwig, Faith Koester, Cody Martin, Zhichao Zhou, Samantha B. Joye, Anna-Louise Reysenbach, Karthik Anantharaman
Endemism Shapes Viral Ecology And Evolution In Globally Distributed Hydrothermal Vent Ecosystems, Marguerite V. Langwig, Faith Koester, Cody Martin, Zhichao Zhou, Samantha B. Joye, Anna-Louise Reysenbach, Karthik Anantharaman
Biology Faculty Publications and Presentations
Viruses are ubiquitous in deep-sea hydrothermal vents, where they influence microbial communities and biogeochemistry. Yet, viral ecology and evolution remain understudied in these environments. Here, we identify 49,962 viruses from 52 globally distributed hydrothermal vent samples (10 plume, 40 deposit, and 2 diffuse flow metagenomes), and reconstruct 5708 viral metagenome-assembled genomes, the majority of which were bacteriophages. Hydrothermal viruses were largely endemic, however, some viruses were shared between geographically separated vents, predominantly between the Lau Basin and Brothers Volcano in the Pacific Ocean. Geographically distant viruses shared proteins related to core functions such as structural proteins, and rarely, proteins of …
Diapause And Anoxia-Induced Quiescence Are Unique States In Embryos Of The Annual Killifish, Austrofundulus Limnaeus, Patrick R. Clouser, Claire L. Riggs, Amie L. T. Romney, Jason E. Podrabsky
Diapause And Anoxia-Induced Quiescence Are Unique States In Embryos Of The Annual Killifish, Austrofundulus Limnaeus, Patrick R. Clouser, Claire L. Riggs, Amie L. T. Romney, Jason E. Podrabsky
Biology Faculty Publications and Presentations
Diapause is a state of developmental and metabolic dormancy that precedes exposure to environmental stresses. Yet, diapausing embryos are typically stress-tolerant. Evidence suggests that diapausing embryos “prepare” for stress as part of a gene expression program as they enter dormancy. Here, we investigate if diapause II embryos of the annual killifish Austrofundulus limnaeus, which can survive for hundreds of days of anoxia, can mount a transcriptomic response to anoxic insult. Bulk RNAseq was used to characterize the transcriptomes of diapause II embryos exposed to normoxia, 4 h and 24 h anoxia, and 2 h and 24 h normoxic recovery …
Diverse Microbial Prey In The Guts Of Gelatinous Grazers Revealed By Microscopy, Terra C. Hiebert, Anne W. Thompson, Kelly R. Sutherland
Diverse Microbial Prey In The Guts Of Gelatinous Grazers Revealed By Microscopy, Terra C. Hiebert, Anne W. Thompson, Kelly R. Sutherland
Biology Faculty Publications and Presentations
Mucous mesh grazers including pelagic tunicates and thecosome pteropods play a key role in oceanic food webs. They are taxonomically and morphologically diverse and can be highly abundant. Using their fine mucous meshes, these pelagic grazers ingest a wide range of plankton prey and link pelagic and benthic marine ecosystems. Characterizing the diet of this group is central to fully understanding marine food webs and developing accurate food web models. However, gelatinous grazers are challenging to study owing to their physically delicate composition so studying their feeding ecology requires numerous complementary techniques. Microscopy has largely been supplanted by other methods, …
Color Aberrations In Seven Bird Species In Costa Rica, Lucia Isabel Lopez, Jose Manuel Mora, Adrian Alvarado Rivera
Color Aberrations In Seven Bird Species In Costa Rica, Lucia Isabel Lopez, Jose Manuel Mora, Adrian Alvarado Rivera
Biology Faculty Publications and Presentations
Although there are 935 species of birds in Costa Rica, scientific reports of pigmentation abnormalities in this group are limited. Nevertheless, several cases have been recently documented, including Leucism, Ino mutation, Progressive Graying, Dilution, and two unusual color aberrations in a toucan and a motmot. Here we describe seven cases of color aberrations observed over a period of five years in native birds of Costa Rica. An Eastern Wood-Pewee Contopus virens and a White-collared Manakin manacus candei were Brown. A Scintillant Hummingbird Selasphorus scintilla and a Talamanca Hummingbird, Eugenes spectabilis, also showed a Brown mutation, however, these two cases may …
Lagging Brain Gene Expression Patterns Of Drosophila Melanogaster Young Adult Males Confound Comparisons Between Sexes, Flannery Mclamb, Zuying Feng, Jeanne P. Vu, Lindsey Griffin, Miguel F. Vasquez, Goran Bozinovic
Lagging Brain Gene Expression Patterns Of Drosophila Melanogaster Young Adult Males Confound Comparisons Between Sexes, Flannery Mclamb, Zuying Feng, Jeanne P. Vu, Lindsey Griffin, Miguel F. Vasquez, Goran Bozinovic
Center for Life in Extreme Environments Publications
Many species, including fruit flies (Drosophila melanogaster), are sexually dimorphic. Phenotypic variation in morphology, physiology, and behavior can affect development, reproduction, health, and aging. Therefore, designating sex as a variable and sex-blocking should be considered when designing experiments. The brain regulates phenotypes throughout the lifespan by balancing survival and reproduction, and sex-specific development at each life stage is likely. Changes in morphology and physiology are governed by differential gene expression, a quantifiable molecular marker for age- and sex-specific variations. We assessed the fruit fly brain transcriptome at three adult ages for gene expression signatures of sex, age, and sex-by-age: 6698 …
Environmental Stability Of The Simulated Forest Immersion Therapy (Sfit) Intervention, Amy Miner Ross, Reo J. F. Jones, Kylee Deterding, Ella Rasmussen
Environmental Stability Of The Simulated Forest Immersion Therapy (Sfit) Intervention, Amy Miner Ross, Reo J. F. Jones, Kylee Deterding, Ella Rasmussen
Biology Faculty Publications and Presentations
Background: Shinrin-yoku, forest bathing, has been shown to improve the pain experience in arthritis patients and the immune system in normal healthy patients. Yet, a simulated forest immersion therapy (SFIT) experience has not been tested in these two populations and specifically not in cancer patients. If SFIT complementary therapy in these two populations progresses, the intervention environment as designed needs to be tested. The purpose of this paper is to describe the SFIT setting and test the stability of the interventional environment. Methods: To operationalize SFIT, a protocol of dose delivery was designed and measured. Ambient and surface room temperatures, …
Life History, Reproductive, And Demographic Parameters For Bottlenose Dolphins (Tursiops Truncatus) In Sarasota Bay, Florida, Randall S. Wells, Aleta A. Hohn, Michael D. Scott, Jay C. Sweeney, Forrest I. Townsend, Jason B. Allen, Aaron A. Barleycorn, Katherine A. Mchugh, Kim Bassos-Hull, Gretchen N. Lovewell, Deborah A. Duffield, Cynthia R. Smith, A. Blair Irvine
Life History, Reproductive, And Demographic Parameters For Bottlenose Dolphins (Tursiops Truncatus) In Sarasota Bay, Florida, Randall S. Wells, Aleta A. Hohn, Michael D. Scott, Jay C. Sweeney, Forrest I. Townsend, Jason B. Allen, Aaron A. Barleycorn, Katherine A. Mchugh, Kim Bassos-Hull, Gretchen N. Lovewell, Deborah A. Duffield, Cynthia R. Smith, A. Blair Irvine
Biology Faculty Publications and Presentations
Studies of the resident community of bottlenose dolphins (Tursiops truncatus) of Sarasota Bay, Florida, have been conducted for more than 50 years. Detailed histories have been collected for resident individuals through integrated observations, systematic photographic identification surveys, tagging and tracking, catch-and-release health assessments, remote biopsy sampling, and stranding response. This has produced a unique dataset documenting life history milestones and vital rates of a small cetacean. Analyses of data from 482 resident Sarasota Bay dolphins have revealed estimated maximum life spans of 67 years for females and 52 years for males. For females, predicted age at sexual maturation …
Elements Of Social Capital And Counterspace Processes Contribute To Undergraduate Stem Student Development Of A Sense Of Belonging, Mackenzie J. Gray, Jasmine N. Yacobian, Erin Shortlidge
Elements Of Social Capital And Counterspace Processes Contribute To Undergraduate Stem Student Development Of A Sense Of Belonging, Mackenzie J. Gray, Jasmine N. Yacobian, Erin Shortlidge
Biology Faculty Publications and Presentations
Having a sense of belonging can promote persistence in the STEM fields, but less is known about what it means to develop that sense of belonging. To investigate this phenomenon, we conducted semi‐structured interviews with a cohort of STEM students (n = 10) nearing graduation at an urban university regarding their sense of belonging and qualitatively coded the interviews using thematic analysis. Results revealed that all interviewed students clearly articulated feelings of belonging, making them an ideal population from which to learn more. We applied two frameworks to guide our understanding of what factors promoted the development of a sense …
Heterospecific Coprophagy In The White-Tailed Deer Odocoileus Virginianus (Zimmermann, 1780) In Costa Rica, Mora Manuel Jose, Juan De Dios Astorga-Acuña
Heterospecific Coprophagy In The White-Tailed Deer Odocoileus Virginianus (Zimmermann, 1780) In Costa Rica, Mora Manuel Jose, Juan De Dios Astorga-Acuña
Biology Faculty Publications and Presentations
Animals may engage in coprophagy, including heterospecific coprophagy, where they consume the feces of other species. The white-tailed deer, Odocoileus virginianus, primarily feeds on plant material, such as tender forbs and shrub shoots. This report documents a case of heterospecific coprophagy by the white-tailed deer in Costa Rica, where two individuals were observed consuming domestic horse feces. The reasons for heterospecific coprophagy in ruminants like the white-tailed deer are unclear. Nutritional supplementation, microbial transfer, or other ecological factors may play a role in this behavior. However, such a behavior also poses risks, including the transmission of diseases and parasites from …
The Complex Development Of Psoralen-Interstrand Crosslink Resistance In Escherichia Coli Requires Acrr Inactivation, Retention Of A MarboxSequence, And One 3 Of Three Mara, Soxs, Or Rob Global Regulators, Travis K. Worley, Ayah H. Asal, Lo Cooper, Charmain T. Courcelle, Justin C. Courcelle
The Complex Development Of Psoralen-Interstrand Crosslink Resistance In Escherichia Coli Requires Acrr Inactivation, Retention Of A MarboxSequence, And One 3 Of Three Mara, Soxs, Or Rob Global Regulators, Travis K. Worley, Ayah H. Asal, Lo Cooper, Charmain T. Courcelle, Justin C. Courcelle
Biology Faculty Publications and Presentations
Crosslinking agents, such as psoralen and UVA radiation, can be effectively used as antimicrobials and for treating several dysplastic conditions in humans, including some cancers. Yet, both cancer cells and bacteria can become resistant to these compounds, making it important to understand how resistance develops. Recently, several mutants were isolated that developed high-levels of resistance to these compounds through upregulation of components of the AcrAB-TolC-efflux pump. Here, we characterized these mutants and found that resistance specifically requires inactivating mutations of the acrR transcriptional repressor which also retain the marbox sequence found within this coding region. In addition, the …
Best Practices For The Naming Of Species, Luis A. Ruedas, Ryan W. Norris, Robert M. Timm
Best Practices For The Naming Of Species, Luis A. Ruedas, Ryan W. Norris, Robert M. Timm
Biology Faculty Publications and Presentations
The process of describing a species has evolved considerably since the modern age of taxonomy was initiated with the publication of the 10th edition of Linnaeus’ Systema Naturæ in 1758. Nevertheless, the basic unit of the taxonomic framework remains the species group (species and subspecies). As a result, it is incumbent upon individuals undertaking species-group descriptions to strive for the highest standards, just as it is for reviewers and editors to hold authors to those same standards. The clear and mounting biodiversity crisis, the increasing proliferation of journals, the multiplication of journals publishing only in electronic format, the decline in …
Systematics Of The Rhinolophus Landeri Complex, With Evidence For 3 Additional Afrotropical Bat Species, Bruce D. Patterson, Terrence C. Demos, Laura Torrent, Amanda L. Grunwald, Cecilia Montauban, Julian C. Kerbis Peterhans, Molly M. Mcdonough, Carl W. Dick, Michael Bartonjo, M. Corrie Schoeman, Multiple Additional Authors
Systematics Of The Rhinolophus Landeri Complex, With Evidence For 3 Additional Afrotropical Bat Species, Bruce D. Patterson, Terrence C. Demos, Laura Torrent, Amanda L. Grunwald, Cecilia Montauban, Julian C. Kerbis Peterhans, Molly M. Mcdonough, Carl W. Dick, Michael Bartonjo, M. Corrie Schoeman, Multiple Additional Authors
Biology Faculty Publications and Presentations
Roughly a third of all horseshoe bat species (Rhinolophidae: Rhinolophus) are found in Africa, where a recent continent-wide genetic survey suggested the presence of both undescribed and apparently invalid species. Here, we focus on the R. landeri species complex and the recent elevation of R. lobatus Peters, 1852, to species rank. That action created ambiguity in the taxonomy of East African members of the group—are both R. landeri Martin, 1838, and R. lobatus sympatric in East Africa or is another, unnamed species present there? Here, we refine genetic, morphological, and behavioral characterizations of R. landeri and its erstwhile synonyms with …
The Experience Of Homelessness And Its Effects On Gut Eubiosis, Kamerin Villagomez
The Experience Of Homelessness And Its Effects On Gut Eubiosis, Kamerin Villagomez
University Honors Theses
Microorganisms which populate the human gastrointestinal tract (GIT) have a profound effect on overall human health. The relationship between host health and eubiosis, or balance, of the GIT microbiome is symbiotic and can have reciprocal relationships with quality of sleep, quality of diet, stress and mental health, and the experience of pain. These specific aspects of health are unique in populations experiencing homelessness due to the multi-dimensional and complex nature of their lived experience. Very few studies explore populations experiencing homelessness, with even fewer investigating the intersection between this population and the human GIT microbiome. It is important to do …
Tissue-Specific Effects Of Temperature And Salinity On The Cell Cycle And Apoptosis In The Nile Tilapia (Oreochromis Niloticus)., Rachel M. Palmer, Arika Sandbach, Bradley A. Buckley
Tissue-Specific Effects Of Temperature And Salinity On The Cell Cycle And Apoptosis In The Nile Tilapia (Oreochromis Niloticus)., Rachel M. Palmer, Arika Sandbach, Bradley A. Buckley
Biology Faculty Publications and Presentations
The Nile Tilapia (Oreochromis niloticus) evolved in warm, freshwater rivers, but possesses a broad physiological tolerance to a range of environmental conditions. Due to this hardiness and resilience, this species has been successfully introduced to regions widely outside of its native range. Here, we examine the impact of temperature and salinity variation on this species at the sub-lethal level. Specifically, Nile Tilapia were exposed to two temperatures (21 °C or 14 °C) and three salinities (0, 16, 34 ppt) for 1-h. Given their native habitat, the 21 °C / 0 ppt exposure was considered the control condition. Both cell cycle …
Short-Term Time-Series Observations Of Phytoplankton Light-Absorption And Productivity In Prydz Bay, Coastal Antarctica, Sarat C. Tripathy, Anvita U. Kerkar, P. Sabu, Sunil K. Padhi, Sudarsana R. Pandi, Amit Sarkar, Bhaskar V. Parli, Rahul Mohan
Short-Term Time-Series Observations Of Phytoplankton Light-Absorption And Productivity In Prydz Bay, Coastal Antarctica, Sarat C. Tripathy, Anvita U. Kerkar, P. Sabu, Sunil K. Padhi, Sudarsana R. Pandi, Amit Sarkar, Bhaskar V. Parli, Rahul Mohan
Biology Faculty Publications and Presentations
The optical characteristics of coastal Antarctic waters exhibit complexity due to the dynamic hydrography influenced by meltwater intrusion, which alters nutrient levels, thermohaline structure, and optically active substances (OAS) regimes. Studies on bio-optical variability and its implications on phytoplankton productivity (PP) are scanty in coastal polar regions. On this backdrop, time-series measurements (72 h at 6 h intervals) of bio-optical properties such as phytoplankton biomass (chlorophyll-a), absorption (aph), and total suspended matter (TSM) concurrently with PP were measured to understand their interplay and variability in relation to the ambient physicochemical settings in the under-sampled Prydz Bay, coastal Antarctica. Our findings …
Dietary Saturated Fatty Acids Modulate Host Innate Immunity, Amy Lorraine Seufert
Dietary Saturated Fatty Acids Modulate Host Innate Immunity, Amy Lorraine Seufert
Dissertations and Theses
Nutrition, cellular metabolism, and inflammatory regulation of the immune system are interconnected, and advancing our understanding of this will greatly improve treatment of metabolic and inflammatory disease. Specifically, dietary saturated fats are becoming increasingly appreciated for their ability to modify innate immune cell function in mammals following absorption into the blood and lymphatic circulation systems. The work herein focuses on the capacity for lipids in the diet to modulate innate immune memory. My thesis first broadly outlines fundamental background, including: the evolution of human nutrition, the discovery of innate immune memory, and key topics that reoccur throughout the text surrounding …
Prochlorococcus Death By A Ubiquitous Zooplankton Filter Feeder, Avery Harman
Prochlorococcus Death By A Ubiquitous Zooplankton Filter Feeder, Avery Harman
University Honors Theses
Prochlorococcus is a globally abundant cyanobacterium that can help reveal the ecology of microorganisms in the ocean. Specifically, mortality by zooplankton such as appendicularians is globally important and Prochlorococcus can help reveal some of the choices made around feeding for this ubiquitous filter feeder. Two ecotypes of Prochlorococcus were introduced to appendicularians to determine if appendicularian feed selectively between these ecotypes. Further, a single ecotype of Prochlorococcus was fed to appendicularians over a variety of life stages to determine if retention rate changed with appendicularian life stage. My results reveal that there is no significant selection between the two Prochlorococcus …
Removal As A Control Method For Trachemys Scripta Elegans And The Response Of Chrysemys Picta Bellii, Jacob Swanson
Removal As A Control Method For Trachemys Scripta Elegans And The Response Of Chrysemys Picta Bellii, Jacob Swanson
University Honors Theses
The red-eared slider is considered one of the most ubiquitous freshwater turtles globally. Several key ecological advantages and life history traits of this species jointly impact growth rates and survivorship of native freshwater turtles where sympatry occurs. Evaluation of current management actions for red-eared slider turtles is limited, resulting in a paucity of information to guide management for the species and conservation of declining native freshwater turtles. We used previously collected mark-recapture and removal sampling data from sites with sympatric populations of red-eared slider and western painted turtles. We examined the effects of control (trapping and removal) of red-eared sliders …
Root Nodules Of Red Alder (Alnus Rubra) And Sitka Alder (Alnus Viridis Ssp. Sinuata) Are Inhabited By Taxonomically Diverse Cultivable Microbial Endophytes, Robyn Dove, Emily R. Wolfe, Nathan U. Stewart, Abigail Coleman, Sara Herrejon Chavez, Daniel J. Ballhorn
Root Nodules Of Red Alder (Alnus Rubra) And Sitka Alder (Alnus Viridis Ssp. Sinuata) Are Inhabited By Taxonomically Diverse Cultivable Microbial Endophytes, Robyn Dove, Emily R. Wolfe, Nathan U. Stewart, Abigail Coleman, Sara Herrejon Chavez, Daniel J. Ballhorn
Biology Faculty Publications and Presentations
The root nodules of actinorhizal plants are home to nitrogen-fixing bacterial symbionts, known as Frankia, along with a small percentage of other microorganisms. These include fungal endophytes and non-Frankia bacteria. The taxonomic and functional diversity of the microbial consortia within these root nodules is not well understood. In this study, we surveyed and analyzed the cultivable, non-Frankia fungal and bacterial endophytes of root nodules from red and Sitka alder trees that grow together. We examined their taxonomic diversity, co-occurrence, differences between hosts, and potential functional roles. For the first time, we are reporting numerous fungal endophytes of alder root nodules. …
Oil Identification Of Harp Seal And Other Select Marine Mammals, Meghan Pinedo, Deborah A. Duffield, Dalin N. D’Alessandro, Erin R. Price, Edgard O. Espinoza
Oil Identification Of Harp Seal And Other Select Marine Mammals, Meghan Pinedo, Deborah A. Duffield, Dalin N. D’Alessandro, Erin R. Price, Edgard O. Espinoza
Biology Faculty Publications and Presentations
Because of the rich omega-3 fatty acids content, harp seal (Pagophilus groenlandicus) oil is a popular supplement that is packaged as pills in Canada and sold for medicinal purposes, although this practice is banned in the United States. Due to US regulations, it is important to be able to distinguish between fish oil and seal oil, but the taxonomic determination of oils provenance has been a difficult problem to solve. In this study, Direct Analysis in Real Time time-of-flight mass spectrometry (DART TOFMS) was used to analyze the chemotypes of blubber samples collected from seven species of …
The Value Of Support: Stem Intervention Programs Impact Student Persistence And Belonging., Erin E. Shortlidge, Mackenzie J. Gray, Suzanne Estes, Emma C. Goodwin
The Value Of Support: Stem Intervention Programs Impact Student Persistence And Belonging., Erin E. Shortlidge, Mackenzie J. Gray, Suzanne Estes, Emma C. Goodwin
Biology Faculty Publications and Presentations
In response to unwaveringly high attrition from STEM pathways, STEM Intervention Programs (SIPs) support STEM students in effort to increase retention. Using mixed methods (survey and focus groups), we studied students at one university who were either supported or unsupported by SIPs to understand how students may differ in experiences believed to contribute to STEM persistence. We evaluated: sense of belonging, scientific self-efficacy, scientific community values, scientific identity, and STEM involvement. The enrollment status of students two and a half years postsurvey was also tracked. SIP students reported significantly higher science identity and sense of belonging and were more involved …
Examining The Role Of Rgs2 In The Maintenance Of Diapause After Anoxic Stress In Embryos Of The Annual Killifish Austrofundulus Limnaeus, Patrick Clouser
Examining The Role Of Rgs2 In The Maintenance Of Diapause After Anoxic Stress In Embryos Of The Annual Killifish Austrofundulus Limnaeus, Patrick Clouser
Student Research Symposium
Austrofundulus limnaeus live in ephemeral ponds of Venezuela. They have evolved a unique life history that includes embryonic diapause, a period of developmental dormancy, metabolic arrest, and reduced protein synthesis. Diapausing embryos are resistant to environmental stress and survive months without oxygen (anoxia). A. limnaeus’ anoxia tolerance is an important survival mechanism as they can be buried in anoxic soil during development. Analysis of RNAseq data from diapausing A. limnaeus embryos show significant down-regulation of RGS2 transcripts in anoxic embryos. RGS2 regulates G-protein receptor signaling by inhibiting associated Ga-proteins and can inhibit protein synthesis. I hypothesis that …
Dragon Pseudoscorpions Shed Light On Ancient Climate History In The Pacific Northwest, Joshua W. Hootman
Dragon Pseudoscorpions Shed Light On Ancient Climate History In The Pacific Northwest, Joshua W. Hootman
Student Research Symposium
Pseudoscorpions are an ancient and diverse group of understudied arachnids, and there is much to be learned about their relationships to each other. Pseudoscorpions are one of many leaf-litter dwelling and low dispersing invertebrates that inhabit the forests of the Pacific Northwest. Previous phylogeographic studies of Pacific Northwest taxa have shed light on some of the climatic and geologic events that have shaped the area's flora and fauna. One purpose of this study is to determine if there is similar genetic structuring within the pseudoscorpion populations present in the study area, or if there is even more structure likely influenced …