English: Title: Amphibians of La Escalera Region, Southeastern Venezuela : taxonomy, ecology, and biogeography Identifier: amphibiansoflaes00duel (find matches) Year: 1997 (1990s) Authors: Duellman, William Edward, 1930- Subjects: Amphibians; Amphibians; Amphibians; Amphibians Publisher: Lawrence, Kansas : Natural History Museum, The University of Kansas Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: 44 SciENTinc Papers, Natural History Museum, The University of Kansas Kilometers 0-200 m Ijiiiiiiiiiiiil 200-1000 m 1000-1500 m >1500 m Text Appearing After Image: Fig. 35. Map of northeastern South America showing principal physiographic features. Numbers in circles are locations of sites used in biogeographic comparisons: 1 = Hato Masaguaral, Estado Guarico, Venezuela (savanna); 2 = Hato La Guanota, Estado Apure, Venezuela (savanna); 3 = El Manteco, Estado Bolivar, Venezuela (savanna); 4 = Rio Cuyuni, Estado Bolivar, Venezuela (forest); 5 = Sipalwini, Suriname (savanna), 6 = Zanderij, Surinam (savanna); 7 = Petit Saut, French Guiana (forest); 8 = Upper Riviere Oyapock, French Guiana (forest); 9 = Belem, Estado Para, Brazil; 10 = INPA-WWF Reserves north of Manaus, Estado Amazonas, Brazil. For location of sites in La Escalera region, including Sierra de Lema and La Gran Sabana, see figure 1. Modified from Hoogmoed (1979b:fig. 10.5). one site (Appendix). Each species is known only from an average of 2.59 of the 12 sites; 49 (40.2%) of the species are known from only one of the sites. One species (Bufo marimis) is known from nine sites, and three species (Hi/la boans, Scinax rubra, and Leptodactylus fusciis) are known from eight sites. These numbers and the following analy- sis should be viewed as minimal numbers and relation- ships. More intensive collecting at many of the sites, espe- cially those in forests, probably will reveal additional spe- cies. Hoogmoed (1979b) compared anuran faunas in low- land forests and in savannas in the Guianan Region. He noted that among forest-inhabiting anurans there is a dis- tinctly higher resemblance between the anuran faunas of eastern Guiana (Guyana east of the Essequibo River, Suriname, French Guiana, and the northern part of Amapa, Brazil) than between both of those areas and western Guiana (Guyana west of the Essequibo River and Venezu- elan Guayana). On the other hand, among savanna-inhab- iting anurans, the resemblance between eastern Guiana and the Brazilian part of Guiana is only slightly higher than that between both of those areas and western Guiana. For the entire herpetofauna of the Guianan Region, Hoogmoed (1979b:264) concluded: "Within the area, the Essequibo-Rio Branco Depression forms a barrier for the distribution of a number of eastern forest species to the west and of western species to the east. No such function is present for savanna inhabitants that, with the exception of local endemics, are spread throughout the area." Faunal resemblance among 12 sites in the Guianan Region was determined by calculating the coefficient of biogeographic resemblance (CBR) by the formula 2C/(N; + N,) = CBR, where C = number of species in common to Sites 1 and 2, N, = number of species at Site 1, and N, = number of species at Site 2 (Duellman, 1990). These calcu- lations reveal that the number of species shared by any Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.