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Checklist of Amphibians and Reptiles of Barro Colorado Island, Panama, V with Comments on Faunaj Change and Sampling

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Checklist of Amphibians and Reptiles of Barro Colorado Island, Panama, V with Comments on Faunaj Change and Sampling CHARLES W. MTE Checklist of and A. STANLEY RA Amphibians and Reptiles of Barro Colorado Island, Panama, V With Comments on FaunaJ Change and Sampling SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • 1969 NUMBER 10 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY NUMBER 10 Charles w. Myers Checklist of Amphibians and A. Stanley Rand ^d Reptiles of Barro Colorado Island, Panama, with Comments on Faunal Change and Sampling SMITHSONIAN INSTITUTION PRESS CITY OF WASHINGTON SERIAL PUBLICATIONS OF THE SMITHSONIAN INSTITUTION The emphasis upon publications as a means of diffusing knowledge was expressed by the first Secretary of the Smithsonian Institution. In his formal plan for the Institution, Joseph Henry articulated a program that included the following state- ment: "It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge not strictly professional." This keynote of basic research has been adhered to over the years in the issuance of thousands of titles in serial publications under the Smithsonian imprint, commencing with Smithsonian Contributions to Knowledge in 1848 and continuing with the following active series: Smithsonian Annals of Flight Smithsonian Contributions to Anthropology Smithsonian Contributions to Astrophysics Smithsonian Contributions to Botany Smithsonian Contributions to the Earth Sciences Smithsonian Contributions to Paleobiology Smithsonian Contributions to Zoology Smithsonian Studies in History and Technology In these series, the Institution publishes original articles and monographs dealing with the research and collections of its several museums and offices and of professional colleagues at other institutions of learning. These papers report newly acquired facts, synoptic interpretations of data, or original theory in specialized fields. Each publi- cation is distributed by mailing lists to libraries, laboratories, institutes, and interested specialists throughout the world. Individual copies may be obtained from the Smith- sonian Institution Press as long as stocks are available. S. DILLON RIPLEY Secretary Smithsonian Institution Official publication date is handstamped in a limited number of initial copies and is recorded in the Institution's annual report, Smithsonian Year. UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1969 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price 25 cents ABSTRACT One hundred species of amphibians (32) and reptiles (68) are estimated to occur on Barro Colorado Island, on the basis of approximately 47 years of collecting. The island is a seasonally wet, tropical forest locality in man-made Gatun Lake, central Panama. The faunal composition has not been static since the island's formation in 1912-1914. Some species have disappeared from the island whereas some others seem to be recent arrivals. Faunal change is at least partly correlated with vegetational succession, as old clearings change toward mature forest. The extirpation of certain "edge" species and their failure to have recolonized the laboratory clearing indicates that it is easier for a resident population to become extinct than for new colonization to occur. The sampling of such a complex, tropical herpetofauna is shown to be not so difficult as might be expected. Man-hours of collecting are plotted against percent of the herpetofauna for several collections, indicating that nearly one-half of the species can be collected in a few weeks of intensive effort in the rainy season. Approxi- mately 80 percent of the species recorded from the island had been collected by 1931, after only about a decade of sporadic, unsystematic collecting by various persons. The generalization that tropical species have lower population densities than temperate species may not be valid for such groups as frogs and lizards but does seem true of snake faunas in low, humid forest regions. Snakes also are more difficult to collect in the tropics because of shifts in habits. There is a great expansion of tropical snakes into arboreal situations and a general avoidance (by all vertebrates) of rock and log microhabitats, which are frequently occupied by large arachnids. Small terrestrial snakes of lowland tropical forests tend either to be fossorial or to inhabit the leaf litter, where they are difficult to detect. Seasonal aggregations of snakes are rare in the wet tropics. Recent years have brought a greatly increased use a tropical mainland, and is the result of collecting of Barro Colorado Island by ecologists, physiologists, efforts of a number of persons over several decades. By and other nontaxonomists, thus creating a need for reason of its relative completeness, the present list lists of the currently accepted names of local animals. should be useful as a means of comparing the amphib- The present checklist of amphibians and reptiles brings ian and reptile faunas of other areas less well known. up to date the nomenclature and included species of In concluding paragraphs, we comment briefly on earlier lists (Dunn, 1931a, 1931b, 1949; Zetek, 1951), faunal changes and abundance and demonstrate that and also indicates departures in nomenclature from a fauna even as large and complex as this one can be other papers, including Allee (1926), Allee and Torvik effectively sampled within reasonable time limits. (1927), and Netting (1936). Barro Colorado (9° 10' North Latitude) is a former One hundred species of amphibians and reptiles are hilltop and the largest island in Gatun Lake, which estimated to occur in this forested area of less than six was formed by the dredging of the Panama Canal and square miles. This count probably is the most complete the damming of the Chagres River in 1912. The island available of the herpetofauna of any humid locality on is approximately 3600 acres in area (about 14.5 square kilometers), hilly, and has a maximum elevation of Charles W. Myers, Department of Herpetology, The American 452 feet above Gatun Lake, or 537 feet (164 meters) Museum of Natural History, New York, New York 10024. A. Stanley Rand, Smithsonian Tropical Research Institute, above sea level. Surface drainage is by small, clear- Box 2072, Balboa, Canal Zone. water streams with rocky beds that dry to isolated pools 1 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY near the end of most dry seasons. There is a small, up- names may be synonyms, misidentifications, or mis- land swampy area near the center of the island. Except spellings and, if substantially different, are shown in for two small, maintained clearings, the island is cov- parentheses behind names now considered valid. We ered by forest stands of various ages, the youngest and have not been completely consistent in our treatment least extensive being of about 25 years and the oldest of subspecies, omitting available trinomials in some of unknown age but still showing traces of disturbance cases where intraspecific variation is not or only poorly by the human animal. The forest can be classified known, but other times inserting them for no other broadly according to any of several systems, i.e., trop- reason than that the name is well established in the ical monsoon forest (Koppen's climatic classification), Panamanian literature. We consider the designation tropical moist forest (Holdridge's life zone classifica- of subspecies to be of dubious value and a frequent tion), or intermediate between evergreen and semi- hindrance to thorough variational analysis. evergreen seasonal forests (Beard's climax classifica- tion) . The annual rainfall averages 106.91 inches Amphibia (32) (76.57-143.42 inches, 1925-1965). A well-differen- tiated dry season occurs from about the end of De- Gymnophiona (1) cember into April; average rainfall during the period Oscaecilia ochrocephala (Cope) (Caecilia ochroce- January-April is 8.22 inches (1.20-26.64 inches) and phala) two months each average less than 2 inches. A map showing physiognomic aspects of the vegetation is Caudata (2) found in Bennett (1963), and various photographs of the forest are given in Kenoyer's account of vegeta- Oedipina complex (Dunn) (Oedipus complex, O. tional succession (1929). A view of the laboratory simplex, Oedopinola complex) clearing and surrounding forest is appended to Wood- Oedipina parvipes (Peters) (Oedipus parvipes, ring's geological reconnaissance of the island (1958, Oedopinola parvipes) pi. 2). In the list that follows, an asterisk (*) before a name Salientia (29) means that in our experience, the species is relatively LEPTODACTYLIDAE common in the proper habitat. A dagger (f) denotes a species thought to be unusually rare, but there are Eleutherodactylus biporcatus (Peters) certainly other rare species, especially snakes, not so *Eleutherodactylus bufoniformis (Boulenger) (? E. indicated. The phrase "type-locality" after a name rugulosa) means that the name is based on a specimen (the Eleutherodactylus cruentus (Peters)—application of holotype) collected on Barro Colorado Island. Except name uncertain for the frog Phrynohyas (q.v.), those species added * Eleutherodactylus diastema (Cope) since the publication of Zetek's list (1951) are repre- * Eleutherodactylus fitzingeri (Schmidt) (E. fleisch- sented by specimens in the American Museum of Nat- manni, E. palmatus) ural History (AMNH), the United States National ^Eleutherodactylus gaigeae (Dunn) (Lithodytes Museum (USNM), or the University of Kansas Mu- gaigei) seum of Natural History (KU) ; the depository is noted
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