Guidelines and quantitative standards for improved cetacean taxonomy using full mitochondrial genomes

Area of Science:

• Genomics
• Conservation Biology
• Taxonomy

Background:

• Morphological data for taxonomic delineation is often limited for conservation-reliant species.
• Genetic data, particularly mitochondrial genomes, offer higher resolution for taxonomic studies.
• Previous studies focused on control regions, necessitating improved guidelines for whole mitogenomes.

Purpose of the Study:

• To develop quantitative guidelines for taxonomic decisions in cetaceans using whole mitogenome sequences.
• To evaluate divergence and diagnosability estimates for cetacean populations, subspecies, and species.
• To improve taxonomic resolution, especially for small sample sizes or low genetic diversity.

Main Methods:

• Analysis of whole mitogenome sequences from cetacean populations.
• Evaluation of divergence and diagnosability metrics.
• Use of simulated data to interpret genetic divergence under varying demographic, cultural, and ecological scenarios.

Main Results:

• Whole mitogenome sequences offer greater resolution than control regions for taxonomic delineation.
• Recommended guidelines integrate complete mitogenomes with other evidence of isolation and divergence.
• Simulated data aids in understanding genetic divergence in complex evolutionary contexts.

Conclusions:

• Complete mitogenomes, combined with supporting evidence, provide robust guidelines for cetacean taxonomy.
• These guidelines enhance taxonomic precision, crucial for conservation efforts.
• The study offers a framework for improving taxonomic resolution in data-limited situations.