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Two methods for geometric morphometric analysis of trichodinids from killifishes.

Paula Marcotegui1, Alma Islas-Ortega2, Delfina Cantatore3

  • 1Laboratorio de Ictioparasitología, Instituto de Investigaciones Marinas y Costeras (IIMyC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata-CONICET, Funes 3350, 7600, Mar del Plata, Argentina. pmarcotegui@cepave.edu.ar.

Parasitology Research
|September 25, 2024
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Summary

Geometric morphometrics effectively differentiate Trichodina bellottii from killifish. Landmark-based analysis showed higher accuracy than outline-based methods for parasite identification.

Keywords:
CiliatesFourier analysisLandmarksTrichodina

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Area of Science:

  • Parasitology
  • Ichthyology
  • Geometric Morphometrics

Background:

  • Trichodina bellottii are common parasites of fish.
  • Accurate identification of parasites is crucial for understanding host-pathogen dynamics.
  • Geometric morphometrics offers advanced tools for taxonomic differentiation.

Purpose of the Study:

  • To compare the efficacy of geometric morphometric techniques for differentiating Trichodina bellottii from co-occurring killifish species.
  • To determine which morphometric approach (outlines vs. landmarks) is more accurate for parasite identification.

Main Methods:

  • Geometric morphometric analysis using both outline and landmark-based approaches.
  • Discriminant analyses and Multivariate Analysis of Variance (MANOVA) were employed.
  • Comparison of accuracy between the two morphometric techniques.

Main Results:

  • Both outline and landmark-based geometric morphometrics successfully differentiated Trichodina bellottii from different host species.
  • Landmark-based analyses, particularly discriminant analyses and MANOVA, demonstrated higher accuracy.
  • The enhanced accuracy of landmark-based methods is attributed to their focus on specific, taxonomically informative points.

Conclusions:

  • Geometric morphometrics, especially landmark-based approaches, are effective tools for the taxonomic differentiation of Trichodina bellottii.
  • Landmark-based analysis provides more precise and accurate results compared to outline-based methods for this parasite.
  • These findings support the utility of geometric morphometrics in fish parasite identification and taxonomy.