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URI permanente desta comunidadehttps://bdc.icmbio.gov.br/handle/cecav/1401
Centro Nacional de Pesquisa e Conservação de Répteis e Anfíbios
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Resultados da Pesquisa
Item Prospects for domestic and feral Cat management on an inhabited tropical island.(Biological Invasions, 2017) Dias, Ricardo Augusto; Abrahão, Carlos Roberto; Micheletti, Tatiane; Mangini, Paulo Rogério; Gasparotto, Vinícius Peron de Oliveira; Pena, Hilda Fátima de Jesus; Ferreira, Fernando; Russell, James Charles; Silva, Jean Carlos RamosCat management campaigns have been implemented on several islands worldwide. However, few successful campaigns have occurred on permanently inhabited islands. Cats are known for causing severe impacts on the native insular fauna, posing an important threat to biodiversity. Moreover, this species is also responsible for zoonosis maintenance and transmission. A thorough understanding of cat population structure (e.g., supervised vs. unsupervised) is strongly suggested as a management action on inhabited islands, as it might promote more efficient and effective management of this species. Fernando de Noronha is an archipelago in the tropical Atlantic Ocean. The total cat population on the main island was estimated at 1287 animals, most of them supervised and subsidized around inhabited areas. Free-roaming cats currently threaten the endemic terrestrial fauna of Fernando de Noronha, and the cat density found by the present work is among the highest ever recorded on an island. Using population dynamic simulations, the long-term effects of reproduction control and removal of cats from the archipelago were assessed. Removal of cats was also suggested as a necessary management strategy to achieve negative population growth. In addition, it was more cost-effective than reproduction control. However, applying both removal and sterilization strategies to this population resulted in a higher population decrease than removal alone. For these reasons, a combination of reproductive control and cat eradication should be implemented in Fernando de Noronha.Item Manegement of cats and rodents on inhabited islands: an overview and case study Fernando de Noronha, Brazil.(Perspectives in ecology and conservation, 2018) Russell, James; Abrahão, Carlos R.c,d,; Silva, Jean C.R.e,; Dias, Ricardo A.In this paper, an overview of introduced cat and rodent impacts on islands, and methods for their control anderadication, arepresented. FernandodeNoronha, aninhabitedoceanic islandofBrazil,isusedas a case study to illustrate the challenges of cat and rodent management on inhabited islands. Cat impacts have been recorded for 175 vertebrate species, and rat impacts for 173 plant and animal species. Eradication of cats and rodents for species conservation has been successful on small to medium- sized uninhabited or sparsely inhabited islands. However, examples of successful cat and rodent management programmes for biodiversity on inhabited islands are limited. On inhabited islands localised control of cats and rodents occurs, but historically with a focus on agriculture, human livelihoods and animal welfare, and only more recently on native species conservation. Control of cats and rodents on inhabited islands for species conservation lags behind uninhabited islands and the reasons for this are social and complex. Conser vation managers often perceive a lack of support from island residents or administrators, which may or may not actually be the case. Where support does not exist, it may relate to the provisioning of control versus eradication, the techniques proposed, or wider socioeconomic issues. This ultimately translates to conservation inaction, and the ongoing decline and extinction of island fauna. Abundance estimates for cats and density estimates for rats on Fernando de Noronha are presented, along with documented biodiversity impacts, to support recommendations for future management on Fernando de Noronha. © 2018 Associação Brasileira de Ciencia ˆ Ecologica ´ e Conservação. ˜ Published by Elsevier Editora Ltda. This is an open access article under the CC BY-NC-ND licenseItem Extinction risk evaluation and population size estimation of Bothrops insularis (Serpentes: Viperidae), a critically endangered insular pitviper species of Brazil.(South American Journal of Herpetology, 2021) Abrahão, Carlos Roberto; Amorim, Ligia Grazzielli; Magalhães, Adriana Melo; Azevedo, Carlos Renato; Grisi-Filho, José Henrique Hildebrand; Dias, Ricardo AugustoThe golden lancehead pitviper (Bothrops insularis) is a critically endangered species endemic to the Queimada Grande Island, a federally protected area located 33 km off the southern coast of São Paulo State, Brazil. Adults have specialized diet, preying upon migrating birds, and the species' reproductive efficiency is quite lower than its continental related species, B. jararaca. Potential threats to B. insularis include illegal removal, introduction of exotic species or diseases, and catastrophic events such as wildfire. The population size of B. insularis was estimated at 2,899 individuals (CI 95% = 1,903; 4,416) in its forested habitat using distance sampling. This is the first population estimation using 3D area model for a reptile habitat. Bothrops insularis was more sensitive to harvesting of few individuals yearly than a catastrophic event that causes mortality over 95% of the entire population in a 100-year simulation period. Prioritizing conservation efforts of reptile species in Brazil depends on simple yet robust monitoring methods like the one presented here. This study was only made possible through the concatenation of government, management, and scientific interests. Such synergism should be encouraged in conservation policies in Brazil, especially in remote locations.Item Thermal constraints explain and distribution of the climate telict lizard Colobosauroides carvalhoi (Gymnophthalmidae) in the semiarid Caatinga.(South American Journal of Herptology, 2018) Recoder, Renato Sousa; Magalhães-Júnior, Arnaldo; Rodrigues, Juliana; Pinto, Hugo Bonfim de Arruda; Rodrigues, Miguel Trefaut; Camacho, AgustínWithin the semiarid Caatinga of Brazil, a biome dominated by a xeric arboreal-arbustive vegetation, many lizards are restricted to forest remnants associated with highlands. Although critical for conservation, data to understand the constraints on the distribution of those potential climate relicts are almost nonexistent. Here, we studied aspects of the ecology of the relict forest lizard Colobosauroides carvalhoi (Gymnophthalmidae) in the Caatinga of southern Piauí, northeastern Brazil. We combined data obtained through active sampling with voluntary thermal maximum (VTM) and measurements of environmental temperatures made in different habitats, microhabitats, and seasons to test the prediction that thermal constraints explain the local distribution and abundance of this species. In four field trips, we captured 22 individuals in pitfall traps and 93 in active searches, all in canyon-like valleys covered with semi-deciduous forests. Using plot sampling, we observed that density decreased as distance from rock cliffs increased. Density did not differ among sampling localities but varied among seasons. Field body temperatures were similar to soil temperatures under the leaf litter and lower than air and surface temperatures. Environmental temperatures in forests were lower than the VTM estimated for C. carvalhoi, especially under the leaf litter. Nevertheless, environmental temperatures usually exceeded the VTM at forest borders and in caatingas, in which the species was absent. Our results confirm that C. carvalhoi is spatially constrained to patches of semi-deciduous forests and suggest that its low thermal tolerance likely prevents it from occurring or dispersing through xeric habitats that predominates in Caatinga.