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Capturing and analyzing pattern diversity: an example using the melanistic spotted patterns of leopard geckos.

Tilmann Glimm¹, Maria Kiskowski², Nickolas Moreno³

¹Department of Mathematics, Western Washington University, Bellingham, WA, United States of America.

|October 1, 2021

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Researchers developed a new method to analyze animal color patterns, revealing distinct development pathways for leopard gecko spots from head to tail. This approach aids understanding of pattern formation and evolution.

Area of Science:

Animal coloration and pattern analysis
Developmental biology and evolutionary ecology
Quantitative morphology and biophotogrammetry

Background:

Animal color patterns are crucial for understanding ecological and evolutionary processes.
Analyzing pattern variation requires robust quantitative methods, especially with increasing photographic data.
Understanding pattern development and evolutionary constraints necessitates detailed analysis of pattern elements.

Purpose of the Study:

To develop a quantitative approach for capturing and analyzing melanistic color pattern variation in leopard geckos.
To investigate pattern variation across different body parts (head, trunk, tail, legs) in leopard geckos.
To infer developmental pathways and evolutionary influences on color pattern establishment.

Main Methods:

Keywords:

Pattern analysis Pattern characterization Pattern elements Reptiles Spotted pattern Color pattern

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Development of a novel approach to capture and quantify color pattern elements.
Utilized 14 indices (e.g., area ratio, spot ellipticity, spot size) to compare patterns.
Defined a composite distance metric to assess pattern similarity between individuals and body parts.

Main Results:

Identified a head-to-tail pattern establishment sequence, suggesting independent development for head/tail versus body/legs.
Found greatest variation in spot size and density among body parts and individuals, with less shape variation.
Observed correlations in spot size and density between front legs, back legs, and head/tail/trunk.

Conclusions:

The developed method provides a framework for analyzing complex color pattern variation in diverse species.
Leopard gecko pattern development suggests distinct regional control, with potential independence in head and tail patterning.
Variation in spot size and density, rather than shape, are key drivers of pattern differences in leopard geckos.