Concentric-Ring Demographic Eradication of Boiga irregularis on Guam: A Dual-Zone Strategy Exploiting Trophic Manipulation and Photophobic Behaviour

Technical white paper proposing a dual-zone demographic segmentation strategy for the eradication of the invasive brown tree snake (Boiga irregularis) on Guam. Conventional control methods (toxic baits, trapping, barriers) have failed at island scale for seven decades because they target adults while juvenile survival remains near 90% due to hyper-abundant introduced prey. This document proposes a spatial architecture separating the population into two isolated demographic groups: Juvenile Mortality Zones (ZMJ) intercept breeding females through sterile artificial nest cavities with delayed capture and autonomous sensors, while Privileged Hunting Zones (ZCP) exploit the snake's hardwired photophobia via UV light arrays that concentrate prey in illuminated cores and force starving adults into one-way behavioural trap funnels. The paper includes a complete risk register (ten identified failure modes with mitigations), a concentric-ring deployment protocol from 5-ha pilot to island-scale compression, electrical infrastructure protection co-benefits, and an explicit honest status disclosure. No efficacy at island scale is claimed; a 6-month pilot phase is the mandatory first step. Intended for invasive-species control practitioners, pest control programs, and researchers in population ecology. All hardware is commercial off-the-shelf; no proprietary components.