The Zoogeographic Significance of Caraballo Mountain Range, Luzon Island, Philippines With Focus on the Biogeography of Luzon’s Herpetofauna
Paul Henric P. Gojo Cruz1* and Leticia E. Afuang2
1Faculty, Department of Biological Sciences, College of Arts and Sciences,
Central Luzon State University, Science City of Muñoz, Nueva Ecija
2Faculty, Animal Biology Division, Institute of Biological Sciences,
College of Arts and Sciences, University of the Philippines Los Baños, Laguna
Our recent survey in the Caraballo Mountain Range contributed knowledge about the distribution of herpetofauna of Luzon Island, and allowed comparison of species composition among Luzon’s biogeographic regions. Data collection was done using intensive herpetofaunal survey in the sampling area in Pantabangan-Carranglan Watershed in Carranglan, Nueva Ecija in the Caraballo Mountains. Comparison with Luzon’s mountain ranges was done using presence-based Jaccard similarity index. Extensive literature survey of available distribution data for Luzons’ herpetofauna revealed 153 native and non-native species (45 species of frogs, 65 lizards, 40 snakes, and 3 turtles) representing about 44% of the Philippine herpetofauna. Twenty-five (25) species of frogs and 71 species of reptiles are considered as restricted range, found only in one to three biogeographic regions. Jaccard similarity index showed that the herpetofauna of the Caraballo is most similar to that of the northern Sierra Madre (J= 0.50) and Cordillera Mountain Ranges (J=0.45). The available data showed that the Caraballo has a variable role with regards to Luzon’s herpetofaunal biogeography. The Caraballo possess frogs and snakes that are also found in the Sierra Madre and Cordillera, implying that the mountain range is a site of amalgamation for these faunas. On the other hand, it serves as a filter zone and dispersal barrier for burrowing and diminutive skinks and frugivorous varanids, based on the observed distribution of some members of the genus Brachymeles, Parvoscincus, and Varanus. This result confirms the importance of the Caraballo Range as an important biogeographic link between Sierra Madre and Cordilleras. This maybe attributed to the physical connection that provides shared topography and bioclimatic conditions among the biogeographic regions.
Philippine amphibians and reptiles exhibit high diversity and endemicity. The latest studies listed 112 species of amphibians and 357 species of reptiles in the country, with about 84% endemicity of recorded amphibians and 66% of recorded reptiles (Diesmos et al. 2002; Diesmos et al. 2015). Several studies (Auffenberg 1988; Brown et al. 1996; Diesmos et al. 2005; Siler et al. 2011; Welton et al. 2010, 2012; Brown et al. 2013) on amphibians and reptiles have shown or explained possible dispersal routes, zoogeographical ranges and relationships, and land-bridge connections. Diesmos and co-authors (2002) recognized nine herpetofaunal regions or Pleistocene aggregate island complexes (PAIC) as follows: Batanes PAIC, Babuyanes . . . . . read more
ALVIOLA PA, DUYA MRM, DUYA MV, HEANEY LR, RICKART EA. 2011. Chapter 2: mammalian diversity patterns on Mount Palali, Caraballo Mountains, Luzon. Fieldiana Life and Earth Sciences p. 61-74.
AUFFENBERG W. 1988. Gray’s Monitor Lizard. Gainesville: University of Florida Press. 419p.
BROWN RM, DE LAYOLA LA, LORENZO II A, DIESMOS ML, DIESMOS AC. 2015. A new species of limestone karst inhabiting forest frog, genus Platymantis (Amphibia: Anura: Ceratobatrachidae: subgenus Lupacolus) from southern Luzon Island, Philippines. Zootaxa 4048(2): 191-210.
BROWN RM, FERNER JW, SISON RV, GONZALES PC, KENNEDY RS. 1996. Amphibians and reptiles of the Zambales Mountains of Luzon Island, Republic of the Philippines. Herpetological Natural History 4(1): 1-22.
BROWN RM, GONZALEZ JC. 2007. A New Forest Frog of the Genus Platymantis (Amphibia: Anura: Ranidae) from the Bicol Peninsula of Luzon Island, Philippines. Copeia (2): 251-266.
BROWN RM, MCGUIRE JA, FERNER JW, ICARANGAL N JR., KENNEDY RS. 2000. Amphibians and Reptiles of Luzon Island, II: Preliminary Report on the Herpetofauna of Aurora Memorial National Park, Philippines. Hamadryad 25(2): 175-195.
BROWN RM, OLIVEROS CH, SILER CD, FERNANDEZ JB, WELTON LJ, BUENAVENTE PAC, DIESMOS ML, DIESMOS AC. 2012. Amphibians and Reptiles of Luzon Island (Philippines), VII: Herpetofauna of Ilocos Norte Province, Northern Cordillera Mountain Range. Check List 8(3): 469-490.
BROWN RM, PRUE A, ONN CK, GAULKE M, SANGUILA MB, SILER CD. 2017. Taxonomic Reappraisal of the Northeast Mindanao Stream Frog, Sanguirana albotuberculata (Inger 1954), Validation of Rana mearnsi, Stejneger 1905, and Description of a New Species from the Central Philippines. Herpetological Monographs: 31(1): 210-231.
BROWN RM, SILER CD, OLIVEROS CH, WELTON LJ, ROCK A, SWAB J, WEERD M VAN, BEIJNEN J VAN, JOSE E, RODRIGUEZ D, DIESMOS AC. 2013. The amphibians and reptiles of Luzon Island, Philippines, VIII: the herpetofauna of Cagayan and Isabela Provinces, northern Sierra Madre Mountain Range. ZooKeys 266: 1-120. doi: 10.3897/zookeys.266.3982
BROWN RM, STUART BL. 2012. Patterns of biodiversity discovery through time: an historical analysis of amphibian species discoveries in the Southeast Asian mainland and island archipelagos. p. 348–389. In: Gower, D. J., K. G. Johnson, J. E. Richardson, B. R. Rosen, L. Rüber, and S. T. Williams (Eds.) Biotic Evolution and Environmental Change in Southeast Asia. Cambridge University Press.
CHAO A, CHAZDON RL, COLWELL RK, SHEN TJ. 2006. Abundance-based similarity indices and their estimation when there are unseen species in samples. Biometrics 62(2): 361-371.
DEVAN-SONG A, BROWN RM. 2012. Amphibians and Reptiles of Luzon Island, Philippines, VI: The Herpetofauna of the Subic Bay Area. Asian Herpetological Research 3(1): 1-20.
DIESMOS AC, BROWN RM. 2011. Diversity, Biogeography, and Conservation of Philippine Amphibians. p. 26-49. In: Biology and Conservation of Tropical Asian Amphibians. Proceedings of the Conference “Biology of the Amphibians in the Sunda Region, South-east Asia.” In: Das I, Haas A, Tuen AA. 2011. Institute of Biodiversity and Environmental Conservation, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak, Malaysia.
DIESMOS AC, BROWN RM, ALCALA AC, SISON RV, AFUANG LE, GEE GVA. 2002. Philippine Amphibians and Reptiles: An Overview of Species Diversity, Biogeography and Distribution. In: Ong P, Afuang L, Rosell-Ambal R, editors. Philippine biodiversity conservation priorities: a second iteration of the national biodiversity strategy and action plan. Quezon City (Philippines): Department of Environment and Natural Resources Protected Areas and Wildlife Bureau
DIESMOS AC, BROWN RM, GEE GVA. 2005. Preliminary report on the amphibians and reptiles of Balbalasang-Balbalan National Park, Luzon Island, Philippines. Sylvatrop, The Technical Journal of Philippine Ecosystems and Natural Resources 13(1&2): 63-80
DIESMOS AC, WATTERS JL, HURON NA, DAVIS DR, ALCALA AC, CROMBIE RI, AFUANG LE, GEE-DAS G, SISON RV, SANGUILA MB, PENROD ML, LABONTE MJ, DAVEY CS, LEONE EA, DIESMOS ML, SY EY, WELTON LJ, BROWN RM, SILER CD. 2015. Amphibians of the Philippines, Part I: Checklist of the Species. Proceeding of the California Academy of Sciences 62(3): 457-539.
FERREIRA, C, RIOS-SALDANA CA, DELIBES-MATEOS M. 2016. Hail local fieldwork, not just global models. Nature 534: 326.
FUITEN AM, WELTON LJ, DIESMOS AC, BARLEY AJ, OBERHEIDE B, DUYA MV, RICO ELB, BROWN RM. 2011. A New Species of Stream Frog (Sanguirana) from the Mountains of Luzon Island, Philippines. Herpetologica 67(1): 89-103.
GOJO CRUZ PH. 2017. Diversity and Ecology of Herpetofauna in the Pantabangan-Carranglan Watershed. [M.S. Thesis]. Los Baños, Laguna: University of the Philippines Los Baños. 218p. (Available at the UPLB Library).
HEANEY LR, BALETE DS, DUYA MRM, DUYA MV, JANSA SA, STEPPAN SJ, RICKART EA. 2016a. Doubling diversity: a cautionary tale of previously unsuspected mammalian diversity on a tropical oceanic island. Frontiers of Biogeography 8(2).
HEANEY LR, DS BALETE, EA RICKART. 2016b. The mammals of Luzon Island: biogeography and natural history of a Philippine Fauna. Johns Hopkins University Press, Baltimore.
KREBS CJ. 2014. Ecological Methodology 2nd Edition.Addison Wesley Longman, Inc. p. 1-607.
MCLEOD DS, SILER CD, DIESMOS AC, DIESMOS ML, GARCIA VS, ARKONCEO AO, BALAQUIT KL, UY CC, VILLARESAN MM, YARRA EC, BROWN RM. 2011. Amphibians and Reptiles of Luzon Island, V: The Herpetofauna of Angat Dam Watershed, Bulacan Province, Luzon Island, Philippines. Asian Herpetological Research 2(4): 177-98.
LINKEM CW, BROWN RM. 2013. Systematic revision of the Parvoscincus decipiens (Boulenger, 1894) complex of Philippine forest skinks (Squamata: Scincidae: Lygosominae) with descriptions of seven new species. Zootaxa 3700(4): 501-533. www.mapress.com/zootaxa/
ONG P, AFUANG LE, ROSELL-AMBAL RG. EDS. 2002. Philippine Biodiversity Conservation Priorities: A Second Iteration of the National Biodiversity Strategy and Action Plan. Philippine Department of the Environment and Natural Resources, Quezon City.
PETERSON AT, BALL LG, BRADY KW. 2000. Distribution of the birds of the Philippines: biogeography and conservation priorities. Bird Conservation International 10(2): 149-167.
PhilGIS. Philippine GIS Data Clearinghouse. La Salle University, Ozamiz City, Philippines. Accessed at www.philgis.org. (Retrieved on 6 Dec 2016).
SILER CD, DIESMOS AC, BROWN RM. 2010. New Loam-Swimming Skink, Genus Brachymeles (Reptilia: Squamata: Scincidae) from Luzon and Catanduanes Islands, Philippines. Journal of Herpetology 44(1): 49-60.
SILER CD, LINKEM CW, COBB K, WATTERS JL, CUMMINGS ST, DIESMOS AC, BROWN RM. 2014. Taxonomic revision of the semi-aquatic skink Parvoscincus leucospilos (Reptilia: Squamata: Scincidae), with description of three new species. Zootaxa 3847(3): 388-412. www.mapress.com/zootaxa/
SILER CD, RICO EL, DUYA MR, BROWN RM. 2009. A New Limb-Reduced, Loam-Swimming Skink (Squamata: Scincidae: Brachymeles) from Central Luzon Island, Philippines. Herpetologica 65(4): 449-459.
SILER CD, WELTON LJ, SILER JM, BROWN J, BUCOL A, DIESMOS AC, BROWN RM. 2011. Amphibians and Reptiles, Luzon Island, Aurora Province and Aurora Memorial National Park, Northern Philippines: New island distribution records. Check List: Journal of Species List and Distribution 7(2): 182-195.
VALLEJO B. 2014. The Biogeography of Luzon Island. Telnov D. (ed.) 2014: Biodiversity, Biogeography and Nature Conservation in Wallacea and New Guinea, Volume II.
WELTON LJ, SILER CD, BENET D, DIESMOS AC, DUYA MR, DUGAY R, RICO EL, WEERD M VAN, BROWN RM. 2010. A spectacular new Philippine monitor lizard reveals a hidden biogeographic boundary and a novel flagship species for conservation. Biology Letters 6: 654-658. doi: 10.1098/rsbl.2010.0119
WELTON LJ, SILER CD, DIESMOS AC, DIESMOS MLD, LAGAT R, CAUSAREN R, BROWN RM. 2012. Genetic identity, geographic range, and major distribution records for frugivorous monitor lizards of Luzon Island, Philippines. Herpetological Review 43: 226-30.
YUMUL GP JR., DIMALANTA CV, MAGLAMBAYAN VB, MARQUEZ EJ. 2008. Tectonic setting of a composite terrane: A review of the Philippine island arc system. Geosciences Journal 12: 7-17.