Species Delimitation

Species Delimitation analyzes gene trees to evaluate and quantify species boundaries using coalescent-based statistics and genetic distance assessments.

Key Features:

• Species boundary exploration: Assigns taxa to putative species groups and analyzes gene trees within a phylogenetic framework.
• Statistical analysis under coalescent model: Computes statistics that evaluate the likelihood that observed monophyly or exclusivity arises under a coalescent model.
• Genetic distance assessment: Assesses genetic distances within and between putative species groups and estimates probabilities of correctly identifying species members using tree-based methods.

Scientific Applications:

• Taxonomy: Provides a quantitative basis for defining species boundaries to support taxonomic decisions amid genetic variability and hybridization.
• Evolutionary biology: Tests monophyly and exclusivity hypotheses to inform studies of lineage divergence and coalescent processes.
• Biodiversity assessment: Quantifies genetic differentiation and species membership probabilities for biodiversity surveys and assessments.

Methodology:

Uses coalescent theory to model gene tree evolution within species trees, simulates genealogical processes, computes likelihoods of monophyly or exclusivity under the coalescent model, and assesses genetic distances to estimate probabilities of species identification.