ArticleFrontiers in plant science2026
Hong Kong orchids on the EDGE: a phylogenetic framework for conservation planning, trade mitigation and population rescue.
Article in Frontiers in plant science, 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
Introduction: Hong Kong, a vital part of the Indo-Burma Biodiversity Hotspot, harbours a significant portion of China's orchid diversity within a limited area. This unique flora faces severe treats from habitat degradation, illegal collection and trade, placing many species disproportionately at risk at the local level. Effective conservation prioritization is urgently needed. This study applies the latest EDGE framework to Hong Kong's orchids, integrating phylogenetic distinctiveness with extinction risk to identify conservation priorities and establishing a scientific basis for targeted protection and rescue. Methods: We compiled a comprehensive checklist of Hong Kong orchids and constructed a time-calibrated phylogeny using nuclear (ITS) and plastid ( Results: Our assessment revealed that a significantly higher proportion of Hong Kong's 138 native orchid taxa, comprising 134 species and four varieties, are threatened locally (76 taxa in the Hong Kong Red List) compared to nationally (43 taxa in the China Red List). Phylogenetic analysis of 134 taxa (130 species and four varieties) revealed a significant correlation between ED and Hong Kong Red List status, and EDGE2 analysis using local Red List data highlighted Discussion: The EDGE2 framework effectively balances immediate extinction risk with the preservation of evolutionary history, revealing critical disparities between local and national threat assessments. Importantly, it identifies evolutionarily distinct species overlooked by threat-based methods alone. Positive correlations corroborate an association between threat status and certain ecological traits. Altogether, these findings advocate for the integration of phylogenetic and trait-based approaches into regional conservation strategies to effectively safeguard Hong Kong's unique orchid diversity and its evolutionary heritage, offering a model for other regions globally.
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