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The forest patches of Marilog District, Davao are the remnants of various anthropogenic activities including logging, conversion of land for agriculture, ecotourism and human settlements. Floristic study was carried out in 2018–2019 from 100 established plots measuring 20 x 20 m, with repeated transect walks and opportunistic sampling along forest trails. One-hundred-and-four species of understory flowering plants were identified from 102 genera and 40 families. Species diversity mean values across study sites using Simpson’s (D) and Shannon-Wiener index (H’) were 0.97 and 3.9, respectively. Species diversity was highest in sites 2 and 4 (D = 0.98; H’ = 4.0 each) and lowest in site 5 (D = 0.96; H’ = 3.7). At family level, the most abundant taxa include Zingiberaceae (26 species) (15%), Orchidaceae (19 species) (11%), Gesneriaceae (14 species) (8%), and Rubiaceae and Arecaceae (13 species each) (7%). Conservation status assessment using International Union for Conservation of Nature (IUCN) revealed 10 threatened species, while listing from the Philippines’ administrative order has categorized 13 threatened species. A total of 54 species (ca. 1.14% of the total Philippine endemic vascular flora) of understory flowering plants were Philippine endemics. Findings of this study were used as additional data for the proclamation of Mt. Malambo as Local Conservation Area, which was formalized through a barangay resolution.
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Acma, F.M., N.P. Mendez, N.E. Lagunday & V.B. Amoroso (2019). New record of Plagiostachys albiflora Ridl. (Zingiberaceae) in the Philippines. Modern Phytomorphology 13: 5–8. https://doi.org/10.5281/zenodo.190102
Agduma, A.R., M.J.M.M. Achondo, B.L.P. Bretana, V.P. Bello, L.L. Remollo, L.S. Mancao, J.P. Supremo, J.G.C. Salem & F.R.P. Salvana (2011). Diversity of vascular plant species in an agroforest: the case of a rubber (Hevea brasiliensis) plantation in Makilala, North Cotabato. Philippine Journal of Crop Science 36(3): 57–64.
Alava C. (2001). Ecosystematics Studies of Trees and Pteridophytes in Two Forests in Mindanao. PhD Dissertation. Department of Biology, Central Mindanao University, Musuan, Bukidnon, Philippines.
Amoroso, V.B., F. Acma & H. Pava. (1996). Diversity, status and ecology of Pteridophytes in three forests in Mindanao. Pteridology in Perspective. Royal Botanic Gardens, Kew, London, UK. 55-60.
Amoroso, V.B., N.P. Mendez & N.E. Lagunday (2018a). Mitrastemonaceae: A New Family Record for the Philippines. Philippine Journal of Science 147(4): 775–779.
Amoroso, V.B., F.M. Acma, F.P. Coritico, F.S. Gorme, N.E. Lagunday, M.C.S. Salolog & R.D. Colong (2018b). Floral diversity assessment of the buffer zones and vicinity of the Mt. Hamiguitan Range Wildlife Sanctuary (MHRWS), Davao Oriental: basis for inclusion to protected area zone. Philippine Journal of Systematic Biology 12(2): 36–51.
Amoroso, V.B., A.B. Mohagan, F.P. Coritico, A.G. Ponce, D.O. Amper, S.S. Zamora, F.S. Gorme, R.D. Colong & R.G. Ponce (2018c). Biodiversity Assessment in the Buffer Zone of Mt. Hamiguitan Range Wildlife Sanctuary. CHED Terminal Report.
Aribal, L.G. (2013). Plant Diversity and Structure of the Caimpugan Peat Swamp Forest on Mindanao Island, Philippines. PhD Dissertation. Department of Forest Biological Sciences. University of the Philippines, Los Baños, College, Laguna.
Gilliam, F.S. (2007). The ecological significance of the herbaceous layer in temperate forest ecosystems. Bioscience 57: 845–858.
IUCN (2020). The IUCN Red List of Threatened Species. Accessed at: https://www.iucnredlist.org/. Accessed on 30 April 2020.
Kerns, B.K. & J.L. Ohmann (2004). Evaluation and prediction of shrub cover in coastal Oregon forests (USA). Ecological Indicators 4: 83–98.
Kessler, M., J. Kluge, A. Hemp & R. Ohlemüller (2011). A global comparative analysis of elevational species richness patterns of ferns. Global Ecology and Biogeography 20: 868–880.
Martínez, M.L., O. Pérez-Maqueo, G. Vázquez, G. Castillo-Campos, J. García-Franco, K. Mehltreter, M. Equihua & R. Landgrave (2009). Effects of land use change on biodiversity and ecosystem services in tropical montane cloud forests of Mexico. Forest Ecology Management 258: 1856–1863.
Magurran, A.E. (1988). Ecological Diversity and its Measurement. Princeton University Press, Princeton, NJ.
Magurran, A.E. (2004). Measuring Biological Diversity. Blackwell.
Nguyen, H., D. Lamb, J. Herbohn & J. Firn (2015). Equations to
calculate Important value index (IVI) of species. PLOS ONE. Dataset.
Pelser, P.B., J.F. Barcelona, D.L. Nickrent (eds.) (2011 onwards). Co’s Digital Flora of the Philippines. Accessed from: www.philippineplants.org. Accessed on 03 April 2020.
Rasingam, L. & N. Parthasarathy (2009). Diversity of understory plants in undisturbed and disturbed tropical lowland forests of Little Andaman Island, India. Biodiversity and Conservation 18: 1045–1065.
Shannon, C.E. & W. Wiener (1963). The Mathematical Theory of Communication. University of Illinois Press, Urbana, 117pp.
Suchar, V.A. & N.L. Crookston (2010). Understory cover and biomass indices predictions for forest ecosystems of the Northwestern United States. Ecological Indicators 10: 602–609.
Swamy, P.S., S.M. Sundarapandian, P. Chandrasekar & S. Chandrasekaran (2000). Plant species diversity and tree population structure of a humid tropical forest in Tamil Nadu, India. Biodiversity and Conservation 9: 1643–1669.
Tremblay, N.O. & G.R. Larocque (2001). Seasonal dynamics of understory Vegetation in four eastern Canadian forest types. International Journal of Plant Sciences 162: 271–286.
Xiao-Tau L., Y. Jiang-Xia & T. Jian-Wei (2011). Diversity and Composition of Understory Vegetation in the tropical seasonal rainforest of Xishuangbanna, SW China. Revista de Biología Tropical 59(1): 455–463.