The Koltz Lab at UT Austin
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Image credit: Katie Harris

People

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AMANDA KOLTZ
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Principal Investigator
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NEVO SAGI 
BARD Postdoctoral Fellow 
Nevo is fascinated by the workings of ecosystems and devote my research to unraveling their complexities. His work integrates concepts and methods from both community and ecosystem ecology, with a particular focus on zoogeochemistry—the role of animals in biogeochemical cycles under varying environmental conditions. He is currently investigating how interactions between large herbivores and soil fauna influence carbon dynamics along a broad aridity gradient across Texas rangelands. This research aims to uncover the mechanisms driving these processes and to understand their implications for carbon cycling and ecosystem health in a changing climate.  
ResearchGate profile              Google Scholar

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  JULIA BERLINER
  PhD student 
  Julia earned her MS in Entomology at the University of Georgia, where she studied how insect
  herbivores and predators respond to soil nutrient availability depending on their diet breadth.
  She is fascinated by how biogeochemical cycles ubiquitously shape ecosystems by governing
  community composition and trophic interactions. She is currently a third year PhD student,
  where she is studying how human activities mediate the nutritional quality and community
  composition of shorebird invertebrate prey, with the goal of helping to inform shorebird
​  conservation in the Arctic and the Texas Gulf Coast.

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  ANNIE CRESS
  PhD student 
  Annie is a third year PhD student interested in untangling the ways both living organisms and
  environmental conditions shape ecological processes. She is especially curious about the ways food
  webs and community interactions drive ecosystem functioning. Currently, using wild, white-footed
  deer mice and their helminth parasites as a model system, she is exploring how sublethal infections
  shape the condition, diet, microbiome, and behavior of this widespread wild species. When she isn’t
  linking small organisms to large ecosystem level processes, she enjoys playing pickleball, spending
​  time with friends, and introducing children to the fascinating world of ecology through outreach!

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  TAMARA RHODES
   Summer research technician
    Tamara recently graduated from UT Austin with a degree in microbiology. She's interested in
    microbial ecology, and the role that microbes play in biogeochemical cycles! She also has a BDP
    certificate in Environment and Sustainability.

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KAIRA JOSEPH
Undergraduate student 
Kaira is a senior Biology major at UT with an interest in disease ecology and environmental health. In her free time, she enjoys playing volleyball, traveling, and spending time outdoors. 

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NIRMITI KERKAR
Undergraduate student 
Nirmiti is a senior Biology major interested in interactions among species and how they can affect the environment at large. In her natural habitat, she is often found napping in the sun, swimming when she should be working, and spending time with friends. 

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SAVANNAH COFFELT
Undergraduate student 
Savannah is a senior Biology major with a concentration in wildlife conservation at Fort Valley State University. She is interested in terrestrial and freshwater vertebrates and has a passion for endangered species recovery.  

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MADDIE SCHOUMAN 
Undergraduate student 
Maddie is a senior major in Ecology, Evolution, and Biodiversity at the University of Michigan interested in disease ecology and conservation. 

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ZOE VANCE
Undergraduate student 
Zoe is a Public Health Science major at the University of Michigan interested in environmental health sciences and epidemiology. She's currently contributing to our mouse-parasite project. Outside of school and field work, Zoe enjoys reading, hiking, and pickleball. 

Lab Alumni

Dr. Katie Harris, Postdoc (2024-2025), now a Pollinator Conservation Specialist at Xerces Society for Invertebrate Conservation
Samantha Schrodel, Summer Research Technician (2025)
Elise Bowman, UT Undergraduate in Environmental Science (2024-2025)
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