Abstract
In the following work we examine the richness and altitudinal distribution of Colombian Andean anurans trying to emphasize patterns of distribution. We also supply an updated checklist of Andean anurans in Colombia. At present, Colombian harbors about 396 Andean frogs: 153 species in the Cordillera Occidental, 187 species in the Cordillera Central, and 131 species in the Cordillera Oriental. Of these, the Cordillera Oriental presents the higher number and percentage of endemic species. The frequency distribution of altitudinal ranges for Colombian Andean frogs shows that the majority of species have narrow altitudinal ranges, less than 500 m altitude, and only a few species have broad altitudinal distributions. On the other hand, lowland species have broader altitudinal ranges than do highland species. The hypothesis of a wider altitudinal range of highland anurans is therefore not supported. Finally, the averages of the Jaccard similarity indices for the Andean anurans along altitudinal gradients in Colombian are approximately similar to those of other tropical anurans reported by Huey (1978), but notably lower than those of anurans of temperate localities. Thus, these results are in concordance with Janzen's hypothesis (1967) about a broader altitudinal range for temperate species, likely because of their higher thermal tolerance.References
Acosta-Galvis, A.R. (2000) Ranas, salamandras y caecilias (Tetrapoda: Amphibia) de Colombia. Biota Colombiana, 1, 289–319.
Bernal, M.H., Luna, V.F., Gallego, O. & Quevedo, A. (2007) A new species of poison frog (Amphibia: Dendrobatidae) from the Andean mountains of Tolima, Colombia. Zootaxa, 1638, 59–68.
Bernal, M.H., Páez, C.A. & Vejarano, M.A. (2005) Composición y distribución de los anfibios de la Cuenca del Río Coello (Tolima), Colombia. Actualidades Biológicas, 27 (82), 87–92.
Bruhl, C.A., Mohamed, V. & Linsenmair, K.E. (1999) Altitudinal distribution of leaf litter ants along a transect in primary forests on Mount Kinabalu, Sabah, Malaysia. Journal of Tropical Ecology, 15, 265–277.
Duellman, W.E. (1988) Patterns of species diversity in anuran amphibians in the American tropics. Annals of the Missouri Botanical Garden, 75 (1), 79–104.
Duellman, W.E. (1999) Distribution patterns of amphibians in South America. In: W.E. Duellman (Ed). Patterns of Distribution of Amphibians. A global Perspective. The John Hopkins University Press, Baltimore, pp. 255–328.
Frost D.R. (2007) Amphibian Species of the World: An Online Reference. Version 5.1. Available from: http://research.amnh.org/herpetology/amphibia/index.html (accessed 30 April, 2008). American Museum of Natural History, New York.
Fu, C., Hua, X., Li, J., Chang, Z., Pu, Z. & Chen, J. (2006) Elevation patterns of frog species richness and endemic richness in the Hengduan Mountains, China: geometric constraints, area and climate effects. Ecogeography, 29, 919–927.
Ghalambor, C.K., Huey, R.B., Martin, P.R., Tewksbury, J.J. & Wang, G. (2005) Are mountain passes higher in the tropics?. Janzen´s hypothesis revisited. Integrative and Comparative Biology, 46, 5–17.
Hedges, B.S., Duellman, W.E. & Heinicke, M.P. (2008) A replacement name for Isodactylus Hedges, Duellman, and Heinicke. Zootaxa, 1975, 67–68.
Huey, R.B. (1978) Latitudinal pattern of between-altitudinal faunal similarity: mountains might be “higher” in the tropics. The American Naturalist, 112, 225–229.
Janzen, D.H. (1967) Why mountain passes are higher in the tropics. The American Naturalist, 101, 233–249.
Krebs, C.J. (1989) Ecological methodology. Harper & Row Publishers, New York.
Lynch, J.D. (1998) New species of Eleutherodactylus from the cordillera occidental of western Colombia with synopsis of the distributions of species in western Colombia. Revista de la Academia Colombiana de Ciencias Exactas Físicas y Naturales, 22 (82), 117–148.
Lynch, J.D. (1999) Ranas pequeñas, la geometría de evolución, y la especiación en los Andes Colombianos. Revista de la Academia Colombiana de Ciencias Exactas Físicas y Naturales, 23(86), 143–159.
Lynch, J.D. (2005) Discovery of the richest frog fauna in the world. An exploration of the forests to the north of Leticia. Revista de la Academia Colombiana de Ciencias Exactas Físicas y Naturales, 29 (113), 581–588.
Lynch, J.D. (2006) The tadpoles of frogs and toads found in the lowlands of northern Colombia. Revista de la Academia Colombiana de Ciencias Exactas Físicas y Naturales, 30 (116), 443–458.
Lynch, J.D., Ruiz-Carranza, P.M. & Ardila-Robayo, M.C. (1997) Biogeographic patterns of Colombian frogs and toads. Revista de la Academia Colombiana de Ciencias Exactas Físicas y Naturales, 21 (80), 237–248.
Lynch, J.D. & Suárez-Mayorga, A. (2004) Anfibios en el chocó biogeográfico. In: Rangel, J.O (Ed). Diversidad Biótica IV: El chocó biogeográfico/Costa Pacifica. Unibiblios. Bogotá, pp. 633–667.
McCoy, E.D. (1990) The distribution of insects along elevational gradients. Oikos, 58, 313–322.
Navas, C.A. (2003) Herpetological diversity along Andean elevational gradients: links with physiological ecology and evolutionary physiology. Comparative Biochemistry and Physiology Part A, 133, 469–485.
Navas, C.A. (2005) Patterns of distribution of anurans in high Andean tropical elevations: insights from integrating biogeography and evolutionary physiology. Integrative and Comparative Biology, 46, 82–91.
Olson, D.M. (1994) The distribution of leaf litter invertebrates along a Neotropical altitudinal gradient. Journal of Tropical Ecology, 10, 129–150.
Patterson, B.D., Pacheco, V. & Solari, S. (1996) Distribution of bats along an elevational gradient in the Andes of southeastern Perú. Journal of Zoology, 240, 637–658.
Poynton, J.C. (2003) Altitudinal species turnover in southern Tanzania shown by anurans: some geographical considerations. Systematics and Biodiversity, 1, 117–126.
Rueda, J.V., Rada, M., Sánchez, S., Velásquez, A. & Quevedo, A. (2006) Two new and excepcional poison dart frog of the genus Dendrobates (Anura: Dendrobatidae) from the Northeastern flank of the cordillera Central of Colombia. Zootaxa, 1259, 39–54.
Ruiz-C., P.M., Ardila, M.C. & Lynch, J.D. (1996) Lista actualizada de la fauna de amphibia de Colombia. Revista de la Academia Colombiana de Ciencias Exactas Físicas y Naturales, 20 (77), 365–415.
Savage, J.M., Myers, C.W. (2002) Frogs of the Eleutherodactylus biporcatus group (Leptodactylidae) of Central America and Northern South America, including rediscovered, resurrected, and new taxa. American Museum Novitates, 3357, 1–47.
Southwood, T.R.E. (1966) Ecological methods. Methuen, London.
Stevenson, R.D. (1985) The relative importance of behavioural and physiological adjustments controlling body temperature in terrestrial ectotherms. The American Naturalist, 126, 362–386.
Wiens, J.J., Kuczynski, C.A., Duellman, W.E. & Reeder T.W. (2007) Loss and re-evolution of complex life cycles in marsupial frogs: does ancestral trait reconstruction mislead? Evolution, 61–8, 1886–1899.