Acknowledging more biodiversity without more species

Area of Science:

• Ecology
• Evolutionary Biology
• Genetics

Background:

• Species delimitation is crucial for effective wildlife conservation and research.
• Inconsistent methods lead to unprotected lineages or taxonomic inflation.
• Current approaches struggle with complex phylogeographic patterns and mixed evidence of speciation.

Purpose of the Study:

• To propose a standardized workflow for species delimitation using genomic data.
• To integrate phylogenetic and hybrid zone analyses for robust taxonomic ranking.
• To address taxonomic inflation and improve conservation resource allocation.

Main Methods:

• Utilizing whole-genome datasets for phylogenetic and hybrid zone analyses.
• Ranking phylogeographic lineages as species if they do not freely admix.
• Ranking genetically compatible lineages as subspecies.
• Employing multi-locus genomic data over single barcoding genes.

Main Results:

• The proposed "genomic taxonomy" workflow provides a consistent method for species delimitation.
• Distinguishes between species (non-admixing lineages) and subspecies (compatible lineages).
• Genomic data overcomes limitations of traditional barcoding genes in complex cases.

Conclusions:

• A standardized genomic taxonomy approach enhances consistency and objectivity in species delimitation.
• Formal naming and description of both species and subspecies are encouraged for biodiversity awareness.
• A two-level conservation hierarchy (species and subspecies) promotes balanced protection of intraspecific and interspecific diversity.