Browsing by Autor "Gabriel Callapa"

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Dryophylax chaquensis (Bergna &amp; &Aacute;lvarez, 1993) (Serpentes, Colubridae): first record from Cochabamba Department and a geographic range extension in Bolivia
(Pensoft Publishers, 2024) Luis Rolando Rivas; Gabriel Callapa; Patricia Mendoza-Miranda; Arturo Muñoz; Cord B. Eversole; Randy L. Powell
We present novel distributional information on the little-known snake species Dryophylax chaquensis (Bergna & &Aacute;lvarez, 1993) in Bolivia, including the &#64257;rst record from Cochabamba Department. Our record extends the distribution of this species towards the Bolivian Inter-Andean Dry Forests by approximately 63 km to the west (in a straight line) from the nearest known locality in Vallegrande, Santa Cruz, Bolivia. We comment on the biogeographic distribution, altitude of occurrence, and aspects behavior and natural history of D. chaquensis in Bolivia.
First records of Tropidurus madeiramamore Carvalho, Paredero, Villalobos-Chaves, Ferreira, Rodrigues &amp; Curcio, 2024 (Squamata, Tropiduridae) from Bolivia
(Pensoft Publishers, 2025) Robert Langstroth; Mauricio Herrera; Gabriel Callapa; Luis Rolando Rivas; Lucindo Gonzáles; Lesly López; A Dimeglio; Gregory Schneider; Robert B. Wallace
This note reports the first country records of Tropidurus madeiramamore Carvalho, Paredero, Villalobos-Chaves, Ferreira, Rodrigues & Curcio, 2024 for Bolivia, all northern Beni Department, extending the range by some 300 km to the west of earlier records, clarifying the status of specimens previously reported in the literature as Tropidurus oreadicus Rodrigues, 1987, and providing comments on the biogeographic and conservation values of the Amazonian savannas of the Beni.
Herpetofauna of the Great Tectonic Lakes of Exaltación, Beni Department, Bolivia
(University of Kansas, 2025) Luis Rolando Rivas; Robert B. Wallace; Gabriel Callapa
The Great Tectonic Lakes of Exaltación is a little-explored region of the Beni Department in Bolivia.During a multidisciplinary scientific expedition, we documented the herpetofauna of this part of the floodplains of theLlanos de Moxos and the Cerrado, confirming the presence of 25 amphibian species (Anura) and 40 reptilian species(Testudines, Crocodylia, and Squamata), and estimated species richness of 30 amphibians and 56 reptilian species forthe region. Most reported species have wide distributions in the lowlands, except for Leptodactylus cf. gracilis, a specieswith a restricted distribution in the southern ecoregions of Bolivia. Two threatened turtle species (Podocnemis unifilisand Chelonoidis denticulatus) categorized as Vulnerable were present, as well as other larger reptilian species such as theBlack Caiman (Melanosuchus niger) and the Spectacled Caiman (Caiman yacare).
Mussurana bicolor (Peracca, 1904) (Squamata, Colubridae): additional country records and first list of voucher specimens from Bolivia
(Pensoft Publishers, 2023) Luis Rolando Rivas; Gabriel Callapa; Cord B. Eversole; Randy L. Powell; Robert B. Wallace
We present country records and a list of voucher specimens for Mussurana bicolor (Peracca, 1904) (Serpentes, Colubridae) from Bolivia. There is scarce information on museum specimens and locality data from Bolivia for this species in the scientific literature. Additionally, we discuss two newly collected specimens from the Llanos de Moxos, a floodplain in the Beni Department. This account contributes to the knowledge of the northwestern distributional status of M. bicolor and summarizes available data for Bolivia.
Temperature exposure and possible thermoregulation strategies in the Titicaca water frog Telmatobius culeus, a fully aquatic frog of the High Andes
(Inter-Research, 2018) Arturo Muñoz‐Saravia; Gabriel Callapa; GPJ Janssens
Temperature has an important effect on amphibians, influencing virtually all physiological systems. Thermoregulation is used to manage unfavourable thermal conditions, but has been poorly studied in aquatic amphibians, and no information is available for adult aquatic anurans. We studied the temperatures to which the Critically Endangered and high Andean fully aquatic Titicaca water frog Telmatobius culeus is exposed and investigated possible thermoregulation strategies of the species in the wild. We measured water temperature in different seasons, microhabitats and depths at which T. culeus is most abundant. We established transects to obtain population densities and activity patterns of the species during the day. Seasonal and daily temperature variations as well as temperature variations among depths and microhabitats were noted. These variations were associated with densities of visible T. culeus, where adult densities were higher at depths with more stable temperatures. T. culeus behaviour associated with thermoregulation strategies in the aquatic habitat included depth selection and movement of individuals between different microhabitats. Selection of microhabitat depended on the temperature at a site and the hour of the day. These results indicate possible behavioural thermoregulation strategies such as movement to different sites or basking used by a highly specialized amphibian, and provide insights into how aquatic benthic organisms use strategies for thermoregulation in aquatic heterogeneous environments. These strategies are probably also used by other aquatic organisms from the tropical Andes. Knowledge of how these organisms respond to temperature could also help to understand the impact of global warming on their status.
Tropidurus chromatops Harvey &amp; Gutberlet, 1998 (Squamata, Tropiduridae): first records from and range extension to the Beni Department, Bolivia
(Pensoft Publishers, 2023) Luis Rolando Rivas; Gil A. Ojopi; Cord B. Eversole; Randy L. Powell; Gabriel Callapa
We present the first records of Tropidurus chromatops Harvey & Gutberlet, 1998 from the Beni Department (Bolivia) and extend this species&rsquo; distribution to western Bolivia by approximately 256 km in a straight line to the Beni Floodplains ecoregion. Likewise, we contribute information on some aspects of the natural history, altitude of occurrence, and the geographic distribution of T. chromatops in the Department of Beni.
Vine snakes (Oxybelis) and Sharpnose snakes (Xenoxybelis) (Squamata, Serpentes) from lowlands of Bolivia, with first records of Oxybelis inkaterra for the country
(Pensoft Publishers, 2024) Luis Rolando Rivas; Gustavo Rey-Ortíz; Cord B. Eversole; Randy L. Powell; Gonzalo Navarro-Cornejo; Edson Cortez; Mauricio Ocampo; Gabriel Callapa; Arturo Muñoz
We present information on the occurrence of colubrid vine snakes ( Oxybelis ) and dipsadid sharpnose snakes ( Xenoxybelis ) from the lowlands of Bolivia. These genera have been poorly reported from Bolivia and information presented herein includes nine new record provincials from the departments of Beni, Cochabamba, La Paz, Pando, and Santa Cruz, Bolivia. Moreover, we present the first records of Oxybelis inkaterra Jadin, Jowers, Orlofske, Duellman, Blair & Murphy, 2021 from Bolivia and we extend the known range of this species by approximately 207 km (Río Sipia, La Paz) and 628 km (Campamento Guacharos, Cochabamba) southeast of the type locality (Puerto Maldonado, Peru) in South America. In addition, we present morphometric information, meristic characters, coloration pattern, ecological aspects and natural history for the three species of vine snakes ( O. aeneus , O. fulgidus , O. inkaterra ) and two species of sharpnose snakes ( X. argenteus , X. boulengeri ) from the Bolivian lowlands.
Vine snakes (Oxybelis) and Sharpnose snakes (Xenoxybelis) (Squamata, Serpentes) from lowlands of Bolivia, with first records of Oxybelis inkaterra for the country
(2026) Luis R. Rivas; Gustavo Rey-Ortíz; Cord B. Eversole; Randy L. Powell; Gonzalo Navarro-Cornejo; Edson Cortez; Mauricio Ocampo; Gabriel Callapa; Arturo Muñoz