Diversity and conservation status of Nepenthes in Rokan Hulu Regency, Riau Province, Indonesia

Le résumé fourni par la source

This study investigated the diversity, distribution, population status, habitat characteristics, and conservation status of Nepenthes species in Rokan Hulu Regency, Riau Province, Indonesia. Field surveys were conducted from June to December 2025 using direct habitat exploration across forest, shrubland, and riparian ecosystems. Species identification was performed through detailed morphological examination, focusing on pitcher shape, coloration, peristome structure, leaf morphology, and tendril characteristics, with reference to standard taxonomic literature. A total of three species were documented: Nepenthes eustachya, N. gracilis, N. longifolia. All recorded species are listed under Appendix II of CITES and are generally classified as Least Concern (LC) by the IUCN, indicating low extinction risk but requiring regulated trade and monitoring. Species distribution was relatively balanced between the Rokan IV Koto and Sungai Bungo areas, indicating the persistence of suitable microhabitats despite extensive land-use change. Most recorded species were associated with upland and nutrient-poor environments characterized by high humidity and heterogeneous vegetation structure. Although large portions of natural forest in Rokan Hulu have been converted into oil palm plantations, observed populations appeared relatively stable at the time of study; however, ongoing habitat transformation poses potential long-term risks.

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