ArticleJournal of medical entomology2026
Post-feeding Larval Dispersal Patterns of the Necrophagous Blowfly Lucilia sericata (Diptera: Calliphoridae) Associated to Swine Carcasses.
Article in Journal of medical entomology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Accurate minimum post-mortem interval estimation in forensic entomology relies on understanding necrophagous dipteran dispersal behavior. Post-feeding larval dispersal represents a critical phase impacting evidence recovery in forensic research. Currently, most studies suggest uniform radial dispersal patterns. Our study quantified spatial and temporal patterns of post-feeding larval dispersal in necrophagous Diptera under field conditions, examining how temperature, humidity, soil and season influence dispersal distance and directionality from a dead body. Twelve swine carcasses were deployed across wet and dry seasons in the Pedregal de San Ángel Ecological Reserve, Mexico City. Pitfall traps arranged in 9 concentric rings (1 to 7.4 m diameter) with 36 angular sectors monitored larval dispersal patterns. Among 2,545 individuals from 10 morphospecies were recorded, Lucilia sericata (Meigen) was the most dominant species (87.04%). Circular statistics rejected uniform distribution, revealing significant northwest directional preference (320.74°). Spatial distribution exhibited bimodal patterns with 50% of larvae within 130 cm and 95% within 290 cm. Dry season showed higher larvae concentration toward northwest compared to wet season. Predation by Solenopsis sp. Westwood ants during dry season forced larval aggregation in situ. Post-feeding larval dispersal exhibits consistent directional bias, complementing current uniform radial models. Our findings optimize entomological evidence collection by establishing search priorities: primary exhaustive searches within 3 m capture 95% of dispersing larvae, directional searches toward northwest up to 5 m increase recovery during wet seasons, and concentrated searches within 0.5 m maximize recovery during dry conditions when predation restricts dispersal. These quantified metrics provide operational guidelines for evidence recovery in Neotropical forensic investigations, improving search efficiency while reducing investigation time.
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