Floristic Inventory, Composition, and Distribution of Angiosperms in Lianga, Surigao del Sur, Caraga Region, Mindanao Island, Philippines

Jeffry M. Saro^1*,  April Joy B. Alamban², Ashley Cris G. Bonite³, Janel Layo⁴

Saro, J. M., Alamban, A. J. B., Bonite, A. C. G., & Layo^, L. (2025). Floristic Inventory, Composition, and Distribution of Angiosperms in Lianga, Surigao del Sur, Caraga Region, Mindanao Island, Philippines. International Journal of Interdisciplinary Viewpoints, 1(1),1-8.

Abstract. The diversity of angiosperm species is essential for ecosystem services like carbon storage, soil stabilization, and the preservation of biodiversity. This study investigated the floristic inventory of angiosperms in Lianga, Surigao del Sur, focusing on identifying species, their composition, and distribution patterns. The primary objective was to document the municipality’s plant diversity and provide valuable data to support local conservation efforts. A 20 m x 20 m quadrat was used as the standard sampling method to assess angiosperm diversity. Each quadrat was replicated at least five times along a 50 to 100-meter transect. The species were identified, counted, and photographed following scientific protocols, with online tools and expert verification ensuring accurate identification. The IUCN Red List of Threatened Species was used to assess conservation status. The study identified 19 species from 11 families. The Shannon-Weiner Diversity Index (H’) yielded a low diversity score of 2.241, reflecting an uneven species distribution. This result emphasizes the vulnerability of angiosperm diversity in the area and highlights the critical need for immediate conservation initiatives. Protecting less abundant and rare species is imperative to maintaining ecological stability and enhancing biodiversity. The findings of this study serve as a baseline for further research and provide valuable insights for environmental stakeholders. In conclusion, the floristic inventory revealed limited angiosperm diversity in Lianga, emphasizing the importance of prioritizing conservation strategies. Efforts must be directed toward habitat restoration, species protection, and fostering community involvement to preserve the area’s ecological integrity. Sustained monitoring and adaptive management are essential to ensure the long-term sustainability of angiosperm diversity in the said locale. Recommendations include habitat restoration, promoting native species, local community engagement in conservation, and regular monitoring to ensure ecological balance and long-term sustainability.

Keywords: angiosperms, diversity, composition, distribution, Shannon-Weiner diversity, IUCN red list