Navegando por Assunto "conservation"

Agora exibindo 1 - 4 de 4

Artigo
Extensive sampling and citizen science expand the distribution of the threatened freshwater turtle Ranacephala hogei (Mertens, 1967)
(An Acad Bras Cienc, 2024) Assis, Clodoaldo L.; Valadão, Rafael M.; Mendonça, Sônia Helena S.T. De; Peçanha, Evódio Luis S.; Costa, Henrique C.; Novaes, Camila M.; Barros, Thiago F. De; Rodrigues, Laio S.; Gasparini, João Luiz; Feio, Renato N.
Ranacephala hogei is a South American freshwater turtle considered one of the 25 most endangered chelonian species in the world. Endemic to the Atlantic Forest hotspot of southeastern Brazil, the conservation status of R. hogei is subject to continuous assessment at various levels. However, the scarcity of data regarding this species, particularly its geographic range, challenges these evaluations. In an effort to address these gaps, we conducted a comprehensive long-term inventory using different methods to study this species. Our efforts resulted in a 144% increase in documented occurrence points, including a new hydrographic basin and protected areas. By combining historical and current records, we have observed the persistence of R. hogei in rural areas, even in locations where its extinction was previously predicted. Consequently, our data significantly contribute to supporting future conservation assessments.
Artigo
On the future of the giant South American river turtle Podocnemis expansa.
(Oryx, Fauna & Flora International, 2019) FORERO-MEDINA, GERMAN; FERRARA, CAMILA R.; FAGUNDES, RICHARD C. VOGT CAMILA K.; BALESTRA, RAFAEL ANTÔNIO M.; LACAVA, PAULO C. M. ANDRADE ROBERTO; BERNHARD, RAFAEL; LIPMAN, ALISON J.; FERRER, ANA JULIA LENZ ARNALDO; CALLE, ARSENIO; CALLE-RENDÓN, ANDRES F. APONTE BAYRON R.; CAMILO, CÁSSIA SANTOS; MIRAÑA, ELIS PERRONE ESTEBAN; CUNHA, FABIO A. G.; LOJA, EVA; DEL RIO, JENNIFER; FERNANDEZ, J ORGE LUIZ VERA; HERMÁNDEZ, OMAR E.; DEL AGUILA, RAFAEL; PINO, RAFAEL; CUEVA, RUBEN; MARTINEZ, SINDY; BERNARDES, VIRGÍNIA CAMPOS DINIZ; SAINZ, LILA; HORNE, BRIAN D.
There is a long history of exploitation of the South American river turtle Podocnemis expansa. Conservation efforts for this species started in the 1960s but best practices were not established, and population trends and the number of nesting females protected remained unknown. In 2014 we formed a working group to discuss conservation strategies and to compile population data across the species’ range. We analysed the spatial pattern of its abundance in relation to human and natural factors using multiple regression analyses. We found that > 85 conservation programmes are protecting 147,000 nesting females, primarily in Brazil. The top six sites harbour > 100,000 females and should be prioritized for conservation action. Abundance declines with latitude and we found no evidence of human pressure on current turtle abundance patterns. It is presently not possible to estimate the global population trend because the species is not monitored continuously across the Amazon basin. The number of females is increasing at some localities and decreasing at others. However, the current size of the protected population is well below the historical population size estimated from past levels of human consumption, which demonstrates the need for concerted global conservation action. The data and management recommendations compiled here provide the basis for a regional monitoring programme among South American countries.
Artigo
Population assessment of a novel island invasive: tegu (Salvator merianae) of Fernando de Noronha. In: C.R. Veitch, M.N. Clout, A.R. Martin, J.C. Russell and C.J. West (eds.) (2019). Island invasives
(Occasional Paper SSC no. 62. Gland, Switzerland: IUCN., 2019) Abrahão, Carlos R.; Russell, James Charles; Silva, Jean Carlos Ramos; Ferreira, F. E. Rodrigues; Dias, Ricardo Augusto
Fernando de Noronha is an oceanic archipelago in the Atlantic Ocean, 345 km o൵shore from the Brazilian coast. It comprises 21 islands and islets, of which the main island (FN) is 17 km2 with a rapidly growing tourism industry in the last decades. Despite being a protected area and bearing Ramsar and UNESCO World Heritage site status, it is threatened by multiple terrestrial invasive species since its colonisation in the early 16th century. Invasive species and the increasing tourism contributes to a list of at least 15 endangered or critically endangered species according to IUCN criteria. The black and white tegu (Salvator merianae) is the largest lizard in South America, occurring in most of the Brazilian territory and reaching up to 8 kg and 1.6 m from head to tail. As an omnivorous and opportunistic lizard, it feeds on a variety of available items, including smaller vertebrates and eggs. The introduction of the tegu to FN as well as its immediate impact on local fauna were not recorded; however, its ongoing impact is expected to be high. We captured and marked 103 tegu in FN during the months of February and November of 2015 and 2016. We also counted animals by line-transect census in a sparsely inhabited and an uninhabited area of FN. Body size a൵ected the capture probabilities, while season and sex had little or no e൵ect. Densities estimated by capture-recapture in the sparsely inhabited area varied from 2.29 to 8.28 animals/ha according to sampling season. Line transect census in the same area revealed a density of 3.98 (±1.1) animals/ha and in the uninhabited area 13.83 (±3.9) animals/ha. Home range was 10.54 ha, ranging from 7.36 to 15.33 hectares. Tegu activity decreased in the months of July and August of 2015. Results from this study can assist conservation managers and decision makers to implement a science-based tegu management programme in the future.
Artigo
USE OF KNOWN INDIVIDUAL MARKING IN RESEARCH AND MONITORING OF FRESHWATER TURTLE POPULATIONS
(ResearchGate, 2024) Cunha, Fabio; Ândrade, Marcelo
The marking or tagging of turtles is a widely used to facilitate the monitoring of population demography, structure, and conservation of species. Even though they are used in many studies of turtle demography, the available methods are not very efficient, except for microchips (Passive Intergraded Transponder/PIT tags); however, the latter is too expensive to be used on a large scale. Here we present a viable, cost-effective tagging alternative that uses a durable plastic cattle tag and pin. Turtles in the genus Podocnemis were tagged in the Lower-Amazon region, west of the state of Pará, Amazon, Brazil. This method is highly recommended for future work on monitoring and population structure of large species of freshwater turtles. In addition to feasibility, it can be used in the form of citizen science, as the information can be obtained by laypeople and taken to researchers and conservationists. Resumen El marcado o marcaje de tortugas es un método ampliamente utilizado para facilitar el seguimiento de la demografía y estructura de las poblaciones y la conservación de las especies. Aunque se utilizan en muchos estudios de demografía de tortugas, los métodos disponibles no son muy eficaces, excepto los microchips (Passive Intergraded Transponder/PIT tags); sin embargo, estos últimos son demasiado caros para ser utilizados a gran escala. Aquí presentamos una alternativa de marcado viable y rentable que utiliza una marca de plástico duradera para ganado y un alfiler. Se marcaron tortugas del género Podocnemis en la región del Bajo Amazonas, al oeste del estado de Pará, Amazonas, Brasil. Este método es muy recomendable para futuros trabajos de seguimiento y estructura poblacional de grandes especies de tortugas dulceacuícolas. Además de su viabilidad, puede utilizarse en forma de ciencia ciudadana, ya que la información puede ser obtenida por profanos y llevada a investigadores y conservacionistas.