Speciation

Speciation is the τ-categorical lineage-fission morphism on the code-space fitness landscape: a population-level basin-bifurcation event where two sub-populations cross a saddle in the fitness landscape (VI.R20) and PPAS dynamics (VI.D50) drive them into disjoint defect-minimal basins. Reproductive isolation is its observable signature.

Categorical invariant. Speciation = bifurcation of a single Loop_L equivalence class into two disjoint classes under PPAS, occurring at saddle crossings of the fitness landscape — the long-time limit consequence of VI.T27 (Evolution as Optimisation).

Primary registry anchor: VI.T27

Supporting items: VI.T14, VI.D50, VI.R20, VI.D49, VI.D62

1. I.K0 — Universe Postulate
2. VI.D15 — Life Sector
3. VI.D50 — PPAS Algorithm — search on fitness landscape
4. VI.R20 — Fitness Landscape Topology — saddle and basin structure
5. VI.T14 — Evolution = PPAS — convergence within a basin
6. VI.T27 — Evolution as Optimisation — basin-bifurcation in the long-time limit

Biomarker: Reproductive-isolation indices (Coyne-Orr); F_st population differentiation; fixed-difference allele counts; ring-species clines; hybrid-zone width; Bateson-Dobzhansky-Muller incompatibility loci.

Measurable range: Mammalian speciation timescales ~10⁵-10⁷ generations; F_st > 0.25 typically indicates strong differentiation; allopatric speciation can complete in <10⁴ generations under strong selection (cichlid radiations); hybrid-zone widths 1-100 km.

Observation method: Population-level whole-genome resequencing for F_st mapping; phylogenomics (ASTRAL, IQ-TREE) for divergence time estimation; reproductive-success crosses for hybrid-fitness measurement; ancient-DNA time-series for in-flight speciation tracking.

Calibration anchor: LG-Y02-kinetic-pseudoscalar-channel

Anchor chain:

1. VI.L18 chirality channel
2. homochirality conserved across every speciation event in the 3.5 Gyr biological record
3. no known counterexample of a speciation event reversing the L-amino-acid / D-sugar handedness

Manuscript reference: manuscript-sources/book-06/part01/ch09-seven-hallmarks.tex

Status: Planned

Related glossary entries

• LG-P10-evolution Evolution
• LG-P08-meiosis Meiosis
• LG-Y02-kinetic-pseudoscalar-channel Kinetic Pseudoscalar Channel

Referenced by

• LG-P10-evolution Evolution