Biology

Peter Blum

Advisor: Dr. Justin Murdock.
My dissertation focuses on how stream insects, that develop in sediments contaminated with toxic polychlorinated biphenyls (PCBs), can transfer PCBs as winged adults to terrestrial consumers, including gray bats (Myotis grisescens), at Arnold Air Force Base in Tullahoma, TN. I am investigating emergent adult insect biomass and PCB export from streams and reservoirs, assessing PCB risk to wildlife, and how stoichiometry influences the transfer of PCBs.

• B.S. Ecology, Evolution and Environmental Biology, Appalachian State University
• M.S. Biology, University of North Carolina at Greensboro

Shrijana Duwadi

Advisor: Dr. Justin Murdock.
My research focuses on the role of plant species and mycorrhizae in nutrient retention in restored wetland habitats. I am also interested in how greenhouse gas production changes in response to seasonal soil microbial aspects and organic matter dynamics in a restored wetland. 

• B.S. Agriculture, Institute of Agriculture and Animal Science, Nepal
• M.S. Forestry, Auburn University

Miranda Gaupp

Advisor: Carla Hurt
For my dissertation, I am creating genomic resources for the streamside salamander (Ambystoma barbouri). Specifically, I am assembling and annotating a reference genome and the species' transcriptome. Additionally, I am performing comparative gene expression analysis in order to investigate population-level differences in response to temperature.

• B.S. Millsaps College
• M.S. Georgia Southern University

Brooke A. Grubb

Advisor: Dr. Hayden Mattingly, Dr. Kit Wheeler

My research takes an interdisciplinary approach using both landscape ecology and genomics work to understand species dispersal, persistence, and ecological needs. My dissertation work involves creating a species status assessment for the Hardin Crayfish (Faxonius wright) and will provide information on their taxonomic validity, habitat needs, life history, and current and future conditions that will be used to make an ESA listing decision. In addition, I am exploring environmental conditions that facilitate their dispersal in a landscape genomics framework.

• B.S. Biology: Wildlife Conservation, Southeast Missouri State University
• M.S. Biology, Austin Peay State University

Cory Highway

Advisor: Dr. Brad Cohen.
I am studying the ecology of wintering mallards in western Tennessee. Specifically, I am interested in the resource selection of wintering mallards and the rate of depletion of flooded unharvested corn fields in western Tennessee. 

• B.S. Natural Resources Management, Grand Valley State University

Catherine 'Kitty' Philips

Advisor: Dr. Shawn Krosnick

My research and dissertation center around ethnobotany among Cherokee Women. It includes historical, taxonomic, and researched plants information. I am attempting to keep it centered around plants and methods pre-European settlement. 

• B.S. Tennessee Tech University

Zoë Porter

Advisor: Dr. Justin Murdock
My dissertation will focus on assessing the recovery of ecosystem services in restored agricultural wetlands in West Tennessee and Kentucky. Specifically, I will be looking at nutrient (nitrogen and phosphorus) retention and greenhouse gas (GHG) production tradeoffs to better understand the conditions that optimize flux rates. 

• B.S. in Biology at Oklahoma State University
• M.S. in Biology at University of West Florida

Sahar Salimi

Advisor: Mostafa Rahnama
I am working on Fusarium sp. genome evolution and structure. I use bioinformatics and machine learning techniques to identify and characterize transposon elements. Additionally, I am exploring the effect of transposon on gene expression and genome structure.

• M.S. Institute for Advanced Studies in Basic Sciences (IASBS)
• B.S. University of Kurdistan

Christopher Waters

Advisor: Dr. Shawn Krosnick.
My dissertation research is part of the recovery efforts for the federally endangered mustard species Physaria globosa (Short’s bladderpod). I am investigating the reproduction dynamics, reproduction ecology, and life history of P. globosa populations in Tennessee, Kentucky, and Indiana. A primary objective of my research is the metabarcoding of pollinator eDNA deposited on flowers to efficiently index and monitor pollinator communities across the range of P. globosa.

• B.S. Biology, Tennessee Tech University
• M.S. Integrative Biology, Kennesaw State University

Sara Watkins

Advisor: Dr. Brad Cohen.
Broadly, I study the ecology of eastern wild turkeys. Specifically, I am interested in kin selection, social network analyses, and nest parasitism. My project collaborates with Kentucky Fish and Wildlife, The Hunting Public, Turkeys for Tomorrow, NWTF-KY, and will detail wild turkey reproductive ecology, including gobbling chronology, to aid in conservation planning for turkeys in the Green River basin. 

• B.S. Wildlife Ecology and Conservation Science, University of Florida
• M.S. Forestry and Natural Resources, University of Georgia

Office: Pennebaker 410
Email: sawatkins42@tntech.edu, kyturkeys@gmail.com

Trevor Crawford

Advisor: Dr. Justin Murdock 
I am researching how toxins produced by harmful algal blooms affect nutrient uptake and carbon acquisition in natural algal assemblages in Tennessee reservoirs. This will be done using isotope labelling with carbon-13 and nitrogen-15 to track the uptake of nutrients and carbon into algal cells exposed to microcystin, a common algal toxin in Tennessee. I am interested in tracking biochemical changes in exposed algal cells using fourier-transform infrared spectroscopy to develop new, cheaper methods of diagnosing toxic harmful algal blooms in waterways across the southeastern U.S.

Sarah Elliot

Current research project: The physiological and molecular responses of plants to climate change.

• B.S. Environmental Biology, Ferris State University

Cassandra Fink

Advisor: Dr. Shawn Krosnick

I am researching a species complex containing Lilium formosanum (Formosa Lily), Lilium philippinense (Benguet lily), and Lilium longiflorum (Easter lily). Taxa in this complex appear to be rapidly naturalizing across the Southeast and exhibit characters that could make them potentially invasive. However, it is unclear which species are present in the United States and whether they are hybridizing with one another as they spread. My study focuses on reproductive and floral phenology, pollination mechanisms, seed dispersal, and genetic relationships among this group in the United States. 

• B.S. Wildlife and Fisheries Science, Tennessee Technological University

Andrew Gable

Advisor: Dr. Mark Rogers
My thesis focuses on the dietary overlap between invasive Silver Carp (Hypophthalmichthys molitrix) and native Gizzard Shad (Dorosoma cepedianum) in Kentucky and Barkley Reservoirs. More specifically,  characterizing the feeding selectivity of both species and relating those findings to the available food resources in Kentucky and Barkley Reservoirs on seasonal and spatial levels. I am hopeful that this information can give further insight into how Silver Carp are impacting native fish assemblages in the southeastern reservoirs.

• A.S. Wildlife and Fisheries Management, Hocking College
• B.S. Wildlife and Fisheries Management, West Virginia University 

Eli Harris

Advisor: Dr. Shawn Krosnick
My thesis research focuses on examining the floristics of Window Cliffs State Natural Area, with a particular emphasis on the limestone glade habitats. My research will involve ArcGIS and habitat comparison analyses. I aim for my study to contribute to a better understanding of the flora diversity at Window Cliffs and provide the park service with information for the conservation and management of these unique habitats within Tennessee.

• A.S., Science, Volunteer State Community College
• B.S., Biology - Botany, Tennessee Technological University

Seth Haston

Advisor: Dr. Justin Murdock
I am studying the spatial and temporal distributions of hypoxic zones in the Calfkiller river and how that pertains to reintroduction of the Bluemask Darter (Etheostoma akatulo). With many groundwater inputs, my goal is to try to determine where, when, and why there are zones of low water quality within the Calfkiller River. I hope that my research may be used to inform management decisions within the watershed, aid in the restoration of the Bluemask darter, and help improve understanding of water quality on the health of the aquatic species being affected.

• B.S., University of Tennessee

Parker Hildreth

Advisor: Dr. Carla Hurt.
My thesis research aims to identify at risk hidden diversity within Faxonius durelli (Saddle Crayfish) and Faxonius forceps (Surgeon Crayfish) residing in the Cumberland and Tennessee river drainages. Other projects in progress include, species delimitation of the Faxonius placidus (Bigclaw Crayfish) species complex using genomic/mitochondrial derived data sets and determining if a newly discovered population of the federally endangered Faxonius shoupi (Nashville Crayfish) is a disjunct population or an anthropogenic introduction.

• A.S. General Studies, Motlow State 
• B.S. Wildlife and Fisheries Science, Tennessee Technological University

Kirsten Humphries

Advisor: Dr. Kit Wheeler
For my research, I will conduct a population assessment on a newly discovered, wild population of Barrens Topminnow (Fundulus julisia). The Barrens Topminnow, a small fish endemic to middle Tennessee, is a federally endangered species in rapid decline due to multiple factors, one being the presence of invasive Western Mosquitofish (Gambusia affinis). I will also assess the susceptibility of the new Barrens Topminnow population to Western Mosquitofish invasion. 

• B.S., Biology, Jacksonville State University

Rachael Irby

Advisor: Dr. Mark Rogers

My thesis research is evaluating the changes in population structure of Silver (Hypophthalmichthys moltrix) and Bighead Carp (Hypophthalmichthys noblis) in the Tennessee and Cumberland River systems through time. I am especially interested in the effects of commercial fishing incentives on invasive bigheaded carp populations. My research will provide an understanding of the invasion status, needs for control (e.g., commercial fishing, movement barriers, etc.), and future threats from bigheaded carps.

• B.S. Wildlife, Fisheries, and Aquaculture, Mississippi State University

Tony Kumetis

Advisor: Dr. Kit Wheeler

I am studying the fish community of the headwaters of Cub Creek of the Hatchie River prior to creek restoration efforts. While doing so, we plan on studying the differences in community structure shown through molecular (eDNA metabarcoding) and conventional surveying (i.e. backpack electrofishing). While eDNA metabarcoding has been shown to be a valid surveying method for large rivers and lakes, it has not been thoroughly tested in small anthropogenically impacted headwater streams.

• B.S., Clarion University of Pennsylvania

Claire Mason

Advisor: Dr. Brian Carver
For my research, I will be studying the behavior, movement, and possible spatial distribution patterns of the eastern mole (Scalopus aquaticus) in Middle Tennessee. Specifically, I am wanting to investigate how these patterns differ in rural vs. urban environments.

• A.S. General Studies, Motlow State Community College
• B.S. Biology, Austin Peay State University. 

Haley Oakley 

Advisor: Dr. Joshua Hall
I am researching how resource availability affects the seasonal changes in reproductive effort of Eastern Fence Lizards (Sceloporus undulatus). This will help us learn how habitat quality affects the amount of energy put into offspring. 

• B.S. Biology, Tennessee Technological University

Katie Pabody

Advisor: Dr. Hannah Kinmonth-Schultz
I am researching the effects of early successional habitats on both insect predators and pest populations in gardens. We will focus on the amount of biomass damage caused by insect pests and the abundance of both insect predators and pollinators. We hope this research will support the efforts of local sustainable farms.

• B.S. Animal Behavior, Ecology, & Conservation, Canisius College

Emma Pabon

Advisor: David Beck
Studying small colony variants (SCV) of Staphylococcus aureus. A goal is to develop a medium for improved detection of SCV S. aureus and research antibiotic resistance profiling of human isolates of Staphylococcus aureus.

• B.S., Tennessee Tech University

Abigail Riggs

Advisor: Dr. Bradley Cohen
My current research examines the eastern wild turkey populations throughout Tennessee and Kentucky. More specifically, the factors impacting harvest rates of male wild turkey populations across these states. We intend to provide state agency personnel with an improved harvest model to aid in successful population management strategies.  

• B.S. Zoology, The Ohio State University

Mark Rine

Advisor: Dr. Kit Wheeler

My thesis research will examine variation in stream fish communities in response to temporal occurrences of flow intermittency. To study the effects of flow intermittency on stream fish, I will sample three sub-watersheds with disparate flow regimes and, using multivariate analyses, identify what predictor variables may explain the observed variation of the fish assemblages.

• B.S. Wildlife and Fisheries Science, Tennessee Technological University

Katelynn Sallack

Advisor: Dr. Amanda Rosenberger
My current research project involves updating the freshwater mussel distribution within the Hatchie River. West Tennessee is an understudied region, and many of its rivers have been highly modified through channelization. The Hatchie River remains one of the least degraded rivers in the area, and through my research, I will provide information on the freshwater mussel assemblage as well as identify habitat characteristics important to those species.

• B.S. Clarion University of Pennsylvania (now a campus of Penn West University)

Hannah Swain-Menzel

Advisor: Amanda Rosenberger

My research project focuses on investigating factors affecting eDNA detectability to determine current habitat requirements and the extant distribution of two rare fishes: the Duskytail Darter (Etheostoma percnurum) in Copper Creek, Virginia and the Chucky Madtom (Noturus crypticus) in Little Chucky Creek, Tennessee. Our goal is to develop occupancy modelling centered around eDNA and remotely sourced ecological data. This will help us understand the parameters of eDNA as a tool for the detection of small, rare fishes and inform mangers of potential reintroduction sites for the Duskytail Darter and the presence of the potentially extirpated Chucky Madtom.

• B.S. Fisheries, Range and Wildlife Mangement, Brigham Young University-Idaho

Julia Thulander

My thesis will be focused on Streamside salamanders (Ambystoma barbouri) and the effects of heat stress on early development. I will be incubating field collected eggs in the lab at varied temperatures to monitor growth rates, developmental defects, body mass and snout-to-vent length. I am hopeful that this information will aid in the conservation efforts for the species and potentially lead to successful assurance colonies.

• B.S. Biology, Dickinson College

Dalton Tryba

Advisor: Dr. Justin Murdock

My thesis research focuses on how light and temperature affect growth and toxin production of cyanobacteria in large rivers. I am interested in understanding how conditions unique to large rivers, such as flowing water and vertical cell movement may trigger harmful algal blooms, promote community dominance, and stimulate toxin synthesis. This project will help parameterize a harmful algal bloom prediction model for the Ohio River.

• B.S., Biology, FLorida Gulf Coast University

Kathryn Wilkins

Advisor: Dr. Daniel Combs
I am studying the breeding ecology of Canada geese (Branta canadensis), as influenced by increased hunting pressure in a resident flock of geese in central Tennessee. My study involves field work comparing breeding parameters to a previous field study conducted 20 years ago and analysis of demographic data from a database that contains 25 years of breeding data.

• B.S. Wildlife and Fisheries Science, Tennessee Technological University