Home⇛DAVAO RESEARCH JOURNAL⇛vol. 16 no. 2 (2025)

Flying Fox Species Identification and Habitat Assessment on Luban Island, Philippines: Evidence of Ecological Shifts and Conservation Implications

Ramil L Ramos | Phoebe Calica

Discipline: environmental sciences

 

Abstract:

Luban Island in the Mati City, Davao Oriental, Philippines, is a popular tourist destination renowned for its natural beauty, tranquil environment, and home to unique and endangered species, particularly the rare flying foxes. This study aimed to contribute to their conservation by (1) identifying bat species, (2) conducting a population count and assessing foraging areas, and (3) evaluating habitat conditions. The bat colony was initially identified as the Golden-crowned flying fox (Acerodon jubatus). However, recent assessments show that the roosting colony is now either the Island flying fox (Pteropus hypomelanus), the Large flying fox (Pteropus vampyrus), or a mixed colony of both species. Population counts were conducted using a roost exit count, which recorded no fewer than 3,000 flying foxes, and a photographic count, which documented at least 2,060 individuals. The foraging areas of the flying foxes cover approximately 22.0 hectares, including 1.32 hectares of closed canopy, 1.46 hectares of grassland, 12.37 hectares of shrubland, and 0.21 hectares of perennial crops, providing a diverse and abundant resource base for feeding. Habitat assessments involved field surveys that identified key roosting trees, including Xanthostemon verdugonianus, Lithocarpus sulithi, Shorea astylosa, Canarium ovatum, and mangrove species Rhizophora spp. and Sonneratia alba. Other tree species, including bitaog, balite, coconut, rattan, and various wildlife, were also recorded. The findings of this study offer critical insights that can inform conservation strategies for flying foxes on Luban Island.



References:

  1. Alviola, P. A., Alviola, M. S., Taray, K. J., Lucañas, C. C., De Guia, A. P. O., Dupo, A. L. B., & Lit, I. L., Jr. (2023). Dietary analysis of eight insectivorous bats (Chiroptera) from Puting Bato Cave Complex, Burdeos, Polillo Island, Philippines. Journal of Asia-Pacific Biodiversity, 16(3), 291–299. https://doi.org/10.1016/j.japb.2023.05.003
  2. Alviola, P. A., Cosico, E. A., Eres, E. G., Afuang, L. E., & Lit, I. L., Jr. (2022). Cave-dwelling bat assemblage of Polillo Island, eastern Philippines. Philippine-American Academy of Science and Engineering Journal, 15(1), 25–34.
  3. Aziz, S. A., McConkey, K. R., Tanalgo, K., Sritongchuay, T., Low, M. R., Yong, J. Y., & Racey, P. A. (2021). The critical importance of Old World fruit bats for healthy ecosystems and economies. Frontiers in Ecology and Evolution, 9, 641411. https://doi.org/10.3389/fevo.2021.641411
  4. Bejar, S. G. F., Purificacion, D. M. P., Aragones, L. V., Balais, M. M., de Guia, A. P. O., Duya, M. V., & Duya, M. R. M. (2024). Ranging behavior of Philippine tarsiers (Carlito syrichta) inhabiting a protected forest fragment in Misamis Oriental, Mindanao: Implications for monitoring nocturnal primates. International Journal of Primatology, 1–34. https://doi.org/10.1007/s10764-024-00465-z
  5. Bergmann, A. (2024). Autumn swarming of bats: Phenology and vocal communication of Myotis bats during swarming at the Kalkberg Cave (Bad Segeberg, Germany) and implications for conservation (Doctoral dissertation). http://dx.doi.org/10.17169/refubium-44359
  6. Bhanda, G., Oleksy, R. Z., Reinegger, R. D., Baider, C., & Florens, F. V. (2025). A study of diel and seasonal patterns of loss of commercial lychee fruits to vertebrate frugivores: Implications for mitigating a human-wildlife conflict. PeerJ, 13, e19269.
  7. Bonilla-Aldana, D. K., Jimenez-Diaz, S. D., Arango-Duque, J. S., Aguirre-Florez, M., Balbin-Ramon, G. J., Paniz-Mondolfi, A., & Rodriguez-Morales, A. J. (2021). Bats in ecosystems and their wide spectrum of viral infectious potential threats: SARS-CoV-2 and other emerging viruses. International Journal of Infectious Diseases, 102, 87–96. https://doi.org/10.1016/j.ijid.2020.08.050
  8. Chomel, B. B., Boulouis, H. J., Chang, C. C., Setién, A. A., & Stuckey, M. J. (2023). Bat-related zoonoses. In Zoonoses: Infections affecting humans and animals (pp. 1035–1070). Cham: Springer International Publishing. https://doi.org/10.1007/978-3-031-27164-9_28
  9. Christiano, B. M. (2024). The role of diet choice and social cues in bat foraging behaviour (Doctoral dissertation). https://doi.org/10.26153/tsw/59548
  10. Frick, W. F., de Wit, L. A., Ibarra, A., Lear, K., & O’Mara, M. T. (2024). Conserving bats and their foraging habitats. In A natural history of bat foraging (pp. 305–325). Academic Press. https://doi.org/10.1016/B978-0-323-91820-6.00002-4
  11. Gonzalez, J. C. T., de Guia, A. P. O., Dimalibot, J. C., Pantua, K. V., Gustilo, W. O., and Bantayan, N. C. (2020). Understorey to canopy vertebrate fauna of a lowland evergreen forest in Mt. Makiling Forest Reserve, Philippines. Biodiversity Data Journal, 8, e56999. https://doi.org/10.3897/BDJ.8.e56999
  12. International Union for Conservation of Nature and Natural Resources. (2025). The IUCN Red List of Threatened Species. Version 2025-1.
  13. Jumao-as, C. M., Salvaña, F. R. P., Flores, A. B. A., Eril, S. J. M., Yabut, R. F. A., Abler, C. A. C., and Cano-Mangaoang, C. (2023). New distribution record of golden-crowned flying fox roost (Pteropodidae: Acerodon jubatus) in Timaco Hill, Cotabato City, Bangsamoro Autonomous Region in Muslim Mindanao (BARMM), Philippines. Philippine Journal of Science, 152(5), 1847–1850. https://doi.org/10.56899/152.05.25
  14. Kagan, A. N. (2022). Flying Fox Conservation in an Anthropogenic World (Doctoral dissertation, University of Wisconsin--Stout).
  15. Kumar, V., Elangovan, V., Saroj, S., and Anjum, K. N. (2024). Observations on the effect of artificial lights on foraging behaviour of Greater Short-Nosed Fruit Bat, Cynopterus sphinx (Vahl, 1797) in Babasaheb Bhimrao Ambedkar University Campus, Lucknow, India. Records of the Zoological Survey of India, 547-564. https://doi.org/10.26515/rzsi/v124/i1S/2024/172761
  16. Lugo, A., Kurta, A., and Durán, A. R. (2023). Climate, people, and vegetation of the West Indies. In Bats of the West Indies. A natural history and field guide (Vol. 1, pp. 17–30). https://data.fs.usda.gov/research/pubs/iitf/bc_iitf_2023_lugo_001.pdf
  17. Lunn, T. J., Eby, P., Brooks, R., McCallum, H., Plowright, R. K., Kessler, M. K., and Peel, A. J. (2021). Conventional wisdom on roosting behavior of Australian flying-foxes—A critical review, and evaluation using new data. Ecology and Evolution, 11(19), 13532–13558. https://doi.org/10.1002/ece3.8079
  18. Montiani-Ferreira, F., Plummer, C. E., and Adkins, E. (2022). Ophthalmology of Chiroptera: Bats. In Wild and Exotic Animal Ophthalmology: Volume 2: Mammals (pp. 341–354). Cham: Springer International Publishing. https://doi.org/10.1007/978-3-030-81273-7_15
  19. Morales, M. B., Merencio, Á., and De La Morena, E. L. G. (2023). Evaluation of a potential umbrella species using favourability models: the case of the endangered little bustard (Tetrax tetrax) and steppe birds. Biodiversity and Conservation, 32(10), 3307-3327. https://doi.org/10.1007/s10531-023-02655-2
  20. Mwinyi, A. M., and Nnko, H. J. (2022). Seasonality of Pemba flying fox (Pteropus voeltzkowi) in selected habitats of Pemba Island, and its roles in seed dispersal and germination. African Journal of Ecology, 60(3), 481–491. https://doi.org/10.1111/aje.13005
  21. Osland, M. J., Hughes, A. R., Armitage, A. R., Scyphers, S. B., Cebrian, J., Swinea, S. H., and Bardou, R. (2022). The impacts of mangrove range expansion on wetland ecosystem services in the southeastern United States: Current understanding, knowledge gaps, and emerging research needs. Global Change Biology, 28(10), 3163–3187. https://doi.org/10.1111/gcb.16111
  22. Power, M. L., Foley, N. M., Jones, G., and Teeling, E. C. (2022). Taking flight: An ecological, evolutionary and genomic perspective on bat telomeres. Molecular Ecology, 31(23), 6053–6068. https://doi.org/10.1111/mec.16117
  23. Preece, N. (2024). Endangered Spectacled Flying-fox: a review of past and current knowledge and future needs to re-start its recovery. Australian Zoologist. https://doi.org/10.7882/AZ.2024.007
  24. Pulscher, L. A., Dierenfeld, E. S., Welbergen, J. A., Rose, K. A., and Phalen, D. N. (2021). A comparison of nutritional value of native and alien food plants for a critically endangered island flying-fox. PLOS One, 16(5), e0250857. https://doi.org/10.1371/journal.pone.0250857
  25. Ramírez-Fráncel, L. A., García-Herrera, L. V., Losada-Prado, S., Reinoso-Flórez, G., Sánchez-Hernández, A., Estrada-Villegas, S., and Guevara, G. (2022). Bats and their vital ecosystem services: A global review. Integrative Zoology, 17(1), 2–23. https://doi.org/10.1111/1749-4877.12552
  26. Roswag, M., Roswag, A., Roswag, M. S., Fietz, J., and Taefi, T. T. (2025). Advancing bat monitoring: Assessing the impact of unmanned aerial systems on bat activity. PLOS One, 20(1), e0314679. https://doi.org/10.1371/journal.pone.0314679
  27. Singh, R. (2023). Fruit bats: their importance, threats and conservation. International Journal of Bio-resource and Stress Management, 14(6), 833-853. https://doi.org/10.23910/1.2023.3457
  28. Tanalgo, K. C., and Hughes, A. C. (2021a). The potential of bat-watching tourism in raising public awareness towards bat conservation in the Philippines. Environmental Challenges, 4, 100140. https://doi.org/10.1016/j.envc.2021.100140
  29. Tanalgo, K. C., Sritongchuay, T., and Hughes, A. C. (2021b). Seasonal activity of fruit bats in a monoculture rubber and oil palm plantation in the southern Philippines. Conservation, 1(3), 258-269. https://doi.org/10.3390/conservation1030020
  30. Tanalgo, K. C., Oliveira, H. F., and Hughes, A. C. (2022). Mapping global conservation priorities and habitat vulnerabilities for cave-dwelling bats in a changing world. Science of The Total Environment, 843, 156909. https://doi.org/10.1016/j.scitotenv.2022.156909
  31. Todd, C. M., Westcott, D. A., Martin, J. M., Rose, K., McKeown, A., Hall, J., and Welbergen, J. A. (2022). Body-size dependent foraging strategies in the Christmas Island flying-fox: Implications for seed and pollen dispersal within a threatened island ecosystem. Movement Ecology, 10(1), 19. https://doi.org/10.1186/s40462-022-00315-8
  32. Torrefiel, J., Sabanal, B., Cuta, C. B., Embayarte, I., Modina, R. M., Cruz, C., and Gamalo, L. E. (2023). A detailed assessment of threats to tarsiers and its habitat: A case of Tarsiers Carlito syrichta (Linnaeus, 1758) in Hindang, Leyte. Journal of Wildlife and Biodiversity, 7(3), 80-95. https://doi.org/10.5281/zendo.7308755
  33. Vanderduys, E. P., Caley, P., McKeown, A., Martin, J. M., Pavey, C., and Westcott, D. (2024). Population trends in the vulnerable Grey-headed flying-fox, Pteropus poliocephalus; results from a long-term, range-wide study. PLOS ONE, 19(3), e0298530. https://doi.org/10.1371/journal.pone.0298530
  34. Walker, K. E., Baldwin, C., Conroy, G. C., Applegate, G., Archer-Lean, C., Arthington, A. H., and Ellison, A. M. (2022). Ecological and cultural understanding as a basis for management of a globally significant island landscape. Coasts, 2(3), 152-202. https://doi.org/10.3390/coasts2030009
  35. Yabsley, S. H., Meade, J., Martin, J. M., and Welbergen, J. A. (2021). Human-modified landscapes provide key foraging areas for a threatened flying mammal: the grey-headed flying-fox. PLOS One, 16(11), e0259395. https://doi.org/10.1371/journal.pone.0259395
  36. Zarri, E. C., Naugle, D. E., and Martin, T. E. (2024). Impacts of umbrella species management on non-target species. Journal of Applied Ecology, 61(6), 1411-1425. https://doi.org/10.1111/1365-2664.14654

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