A Study of Predation by the Brown Anole (Norops sagrei) on Spiders in Chiayi County, Taiwan

Gerrut Norval, I-Min Tso, Shao-Chang Huang


502 brown anoles (Norops sagrei) were collected for stomach content analysis from an area surrounding a plant nursery (23°25’51’’ N 120°28’30’’ E) in Santzepu, Sheishan District, Chiayi County, as part of an ongoing study on this invasive trunk-ground lizard species. All the collected lizards were killed with ether and dissected. The stomachs of 166 lizards contained spiders, which were removed for identification to establish a basis upon which future studies on spider predation by N. sagrei in Taiwan can be based. These spiders comprised of 298 individuals from 13 families. Unlike in other studies, in which it was found that this lizard species preyed mainly on web spiders, the majority of the spiders in this study are ground-living species. The results from this study are thus also an indication that this exotic invasive lizard species is most likely very terrestrial in this locality.


ambush hunter; active foraging; competition; invasive species; Anolis sagrei

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Calderon R., Cedeño-Vázquez J. R., and Pozo C. (2003), «New distributional records for amphibians and reptiles from Campeche, México», Herpetol. Rev., 34, 269 – 272.

Campbell T. S. (1996), «Northern range expansion of the brown anole (Anolis sagrei) in Florida and Georgia», Herpetol. Rev., 27, 155 – 157.

Campbell T. S. (1999), «Consequences of the Cuban brown anole invasion in Florida: it’s not easy being green», Anolis Newslett., 5, 12 – 21.

Campbell T. S. (2003), «The introduced brown anole (Anolis sagrei) occurs in every county in Peninsular Florida», Herpetol. Rev., 34, 173 – 174.

Campbell T. S. and Gerber G. P. (1996), «Anolis sagrei. Saurophagy», Herpetol. Rev., 27, 200.

Chen B. and Wise D. H. (1999), «Bottom-up limitation of predaceous arthropods in a detritus-based terrestrial food web», Ecology, 80, 761 – 772.

Conant R. and Collins J. T. (1991), The Peterson Field Guide Series: A Field Guide to Reptiles and Amphibians. Eastern and Central North America. 3rd Edition, Houghton Mifflin, Boston.

Dial R. and Roughgarden J. (1995), «Experimental removal of insectivores from rain forest canopy: direct and indirect effects», Ecology, 76, 1821 – 1834.

Ehrlich P. R. (1989), «Attributes of invaders and the invading process: vertebrates», in: J. A. Drake, H. A. Mooney, F. di Castri, R. H. Groves, F. J. Kruger, M. Rejmánek, and M. Williamson (eds.), Biological Invasions. A Global Perspective, John Wiley and Sons, New York, pp. 315 – 328.

Filmer M. R. (1995), Southern African Spiders: An Identification Guide, Struik Publishers, Cape Town.

Gerber G. P. (1999), «A review of intraguild predation and cannibalism in Anolis», Anolis Newslett., 5, 28 – 39.

Goldberg S. R. and Bursey C. R. (2000), «Transport of helminthes to Hawaii via the brown anole, Anolis sagrei (Polychrotidae)», J. Parasitol., 86, 750 – 755.

Greene B. T., Yorks D. T., Parmer-Lee J. S. Jr., Powell R., and Henderson R. W. (2002), «Discovery of Anolis sagrei in Grenada with comments on its potential impact on native anoles», Caribbean J. Sci., 38, 270 – 272.

Halaj J., Cady A. B., and Uetz G. W. (2000), «Modular habitat refugia enhance generalist predators and lower plant damage in soybeans», Env. Entomol., 29, 383 – 393.

Halaj J. and Wise D. H. (2002), «Impact of a detrital subsidy on trophic cascades in a terrestrial grazing food web», Ecology, 83, 3141 – 3151.

Huey R. B. and Pianka E. R. (1981), «Ecological consequences of foraging mode», Ecology, 62, 991 – 999.

Land Capability Classifiaction (LCC) (2000), Food and Fertilizer Technology Center Newsletter, March, 2 and 8.

Landwer A. J., Ferguson G. W., Herber R. and Brewer M. (1995), «Habitat use of introduced and native anoles (Iguanidae: Anolis) along the northern coast of Jamaica», The Texas J. Sci., 47, 45 – 52.

Lawrence K. L. and Wise D. H. (2000), «Spider predation on forest-floor Collembola and evidence for indirect effects on decomposition», Pedobiologia, 44, 33 – 39.

Lee J. C. (2000), A Field Guide to the Amphibians and Reptiles of the Maya World: The Lowlands of Mexico, Northern Guatemala, and Belize, Cornell Univ. Press, New York.

McAllister C. T., Trauth S. E., and Harris C. S. (2003), «Anolis sagrei», Herpetol. Rev., 34, 261 – 262.

Morrison L. W. and Gilbert L. E. (1999), «Host specificity in two additional Pseudacteon spp. (Diptera: Phoridae), parasitoids of Solenopsis fire ants (Hymenoptera: Formicidae)», Florida Entomologist, 82, 404 – 409.

Nicholson K. E., Paterson A. V., and Richards P. M. (2000), «Anolis sagrei cannibalism», Herpetol. Rev., 31, 173 – 174.

Norval G., Mao J. J., Chu H. P., and Chen L. C. (2002), «A new record of an introduced species, the brown anole (Anolis sagrei) (Duméril and Bibron, 1837), in Taiwan», Zool. Studies, 41, 332 – 336.

Norval G., Mao J. J., and Chu H. P. (2004), «Mabuya longicaudata (Long-tailed Skink). Predation», Herpetol. Rev., 35, 393 – 394.

Pianka E. R. and Vitt L. J. (2003), Lizards: Windows to the Evolution of Diversity, Univ. of California Press, Berkeley.

Porter S. D. and Alonso L. E. (1999), «Host specificity of fire ant decapitating flies (Diptera: Phoridae) in laboratory oviposition tests», J. Econ. Entomol., 92, 110 – 114.

Pullin A. S. (2002), Conservation Biology. 1st Edition, Cambridge Univ. Press, Cambridge.

Rodriguez Schettino L. R. (1999), The Iguanid Lizards of Cuba, Univ. Press of Florida, Gainesville.

Roughgarden J. (1995), Anolis Lizards of the Caribbean: Ecology, Evolution, and Plate Tectonics, Oxford Univ. Press, New York.

Schoener T. W. (1968), «The anolis lizards of Bimini: resource partitioning in a complex fauna», Ecology, 49, 704 – 726.

Schoener T. W. and Spiller D. A. (1980), «Densities, sex ratios, and population structure in four species of Bahamian Anolis lizards», J. Animal Ecol., 49, 19 – 53.

Schoener T. W. and Spiller D. A. (1996), «Devastation of prey diversity by experimentally introduced predators in the field», Nature, 381, 691 – 694.

Schoener T. W. and Spiller D. A. (1999a), «Indirect effects in an experimentally staged invasion by a major predator», Am. Naturalist, 153, 347 – 358.

Schoener T. W. and Spiller D. A. (1999b), «Variation in the magnitude of a predator’s effect from small to large islands», Ecol. illes. Monogr. Soc. dHist. Nat. Balears, 6, 35 – 66.

Schoener T. W. and Toft C. A. (1983), «Spider populations: extraordinary high densities on islands without top predators», Science, 219, 1353 – 1355.

Schoener T. W., Spiller D. A., and Losos J. B. (2002), «Predation on a common Anolis lizard: can the food-web effects of a devastating predator be reversed?» Ecol. Monogr., 72, 383 – 407.

Schwartz A. and Henderson R. W. (1991), Amphibians and Reptiles of the West Indies: Descriptions, Distributions and Natural History, Univ. Press of Florida, Florida.

Shigesada N. and Kawasaki K. (1997), Biological Invasions: Theory and Practice, Oxford Univ. Press, New York.

Song D., Zhu M., and Chen J. (1999), The Spiders of China, Hebei Science and Technology Publishing House, Shijiazhuang.

Spiller D. A., Losos J. B., and Schoener T. W. (1998), «Impact of a catastrophic hurricane on island populations», Science, 281, 695 – 697.

Spiller D. A. and Schoener T. W. (1988), «An experimental study of the effect of lizards on web-spider communities», Ecol. Monogr., 58, 57 – 77.

Spiller D. A. and Schoener T. W. (1990), «Lizards reduce food consumption by spiders: mechanisms and consequences», Oecologia, 83, 150 – 161.

Spiller D. A. and Schoener T. W. (1994), «Effects of top and intermediated predators in a terrestrial food web», Ecology, 75, 182 – 196.

Spiller D. A. and Schoener T. W. (1995), «Long-term variation in the effect of lizards on spider density is linked to rainfall», Oecologia, 103, 133 – 139.

Spiller D. A. and Schoener T. W. (1997), «Folivory on islands with and without insectivorous lizards: an eight-year study», Oikos, 78, 15 – 22.

Spiller D. A. and Schoener T. W. (1998), «Lizards reduce spider species richness by excluding rare species», Ecology, 79, 503 – 516.

Spiller D. A. and Schoener T. W. (2001), «An experimental test for predator-mediated interactions among spider species», Ecology, 82, 1560 – 1570.

Steven G. P. and Lance W. F. (1994), «Anolis sagrei», Herpetol. Rev., 25, 33.

Uetz G. W., Halaj J., and Cady A. B. (1999), «Guild structure of spiders in major crops», J. Arachnol., 27, 270 – 280.

Williamson M. (1996), Biological Invasion, Chapman and Hall, London.

Zug G. R., Vitt L. J., and Caldwell J. P. (2001), Herpetology. An Introductory Biology of Amphibians and Reptiles. 2nd Edition, Acad. Press, San Diego.

DOI: https://doi.org/10.30906/1026-2296-2007-14-3-191-198


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