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Related Experiment Video

Updated: May 11, 2026

Demonstration of the Sequence Alignment to Predict Across Species Susceptibility Tool for Rapid Assessment of Protein Conservation
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Comparing Functional Immune Responses in Three Aquatic Turtle Species.

Isabella V Davis1, Jennifer Terry2, Lorin A Neuman-Lee1

  • 1Department of Biological Sciences, Arkansas State University, Jonesboro, AR 72401, USA.

Integrative and Comparative Biology
|June 10, 2025
PubMed
Summary

Ecoimmunology offers vital tools for reptile conservation. This study reveals distinct immune responses in three freshwater turtle species, highlighting frozen serum+buffy layer as a reliable method for assessing immunocompetence across species.

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Area of Science:

  • * Herpetology
  • * Ecoimmunology
  • * Conservation Biology

Background:

  • * Reptile conservation faces challenges, with ecoimmunological methods offering potential for monitoring at-risk populations.
  • * The reptilian immune system is not well understood, hindering intraspecies comparisons and generalization.
  • * Few studies have explored intraspecies variations in immune function, creating a knowledge gap.

Purpose of the Study:

  • * To evaluate and compare innate immune function across three freshwater turtle species.
  • * To investigate differences in immunocompetence related to microbial challenges and sample manipulation.
  • * To establish a reliable method for assessing reptile immunocompetence for conservation efforts.

Main Methods:

  • * Blood samples were collected from male Red-eared sliders, Mississippi mud turtles, and musk turtles in Spring 2024.
  • * Microbial killing assays were performed using fresh, frozen, and heat-manipulated serum + buffy layer (serum + BL).
  • * Assays utilized Staphylococcus aureus (Gram-positive), Escherichia coli (Gram-negative), and Candida albicans (fungus).

Main Results:

  • * Significant differences in immunocompetence were observed among the three turtle species, varying by microbe and serum + BL manipulation.
  • * Frozen serum + BL proved reliable for assessing immunocompetence across species, particularly when challenged with Gram-negative bacteria due to complement protein activity.
  • * The study identified species-specific immune responses and highlighted the importance of sample handling in immune function assessments.

Conclusions:

  • * Intraspecies comparisons of immune function provide valuable insights into physiological variability in wild reptiles.
  • * Frozen serum + BL is a dependable method for evaluating immunocompetence in freshwater turtles, aiding conservation assessments.
  • * Understanding species-specific immune responses is crucial for effective conservation strategies for at-risk reptile populations.