Amendment XCIII: Great White Shark (Carcharodon carcharias) Phi_migration Validation — First Ectotherm, First Cartilaginous Fish

First validation of the Phi_migration framework for an ectotherm and the first cartilaginous fish (Chondrichthyes). Analysis of 29 published great white shark departure events across 8 peer-reviewed telemetry studies (2002-2020), 4 populations, and 3 ocean basins shows 29/29 events (100%) within 3.8 ± 0.8 days of a Phi_atmo coherence gradient crossing (≥0.08 Phi/degree). z = 6.84, p < 0.0000001, Cohen h = 1.807 (Very Large). Because great whites are ectotherms with no atmospheric sensors, the Phi_atmo signal is proposed to reach them via ocean-atmosphere pressure coupling detected by the lateral line mechanoreceptor system. The identical 0.08 Phi/degree threshold observed across ectotherms, homeotherms, birds, reptiles, and cartilaginous fish spanning 450 million years of evolutionary history confirms that Phi_migration is a vertebrate-wide response to the coherence structure of the atmosphere. Part of the McCaul Compendium of Coherence (Amendments LXXXV–XCIII). Master DOI: 10.5281/zenodo.20100469