Navegando por Assunto "Amazon basin"

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Artigo
Distribuition of Chelus fimbriata and Chelus orinocensis (Testudines: Chelidae)
(Chelonian Conservation and Biology, 2021-06) CUNHA, FÁBIO A.G.; FAGUNDES, CAMILA K.; BRITO, ELIZÂNGELA S.; VOGT, RICHARD C.; MAFFEI, FÁBIO; PEZZUTI, JUAREZ; FELIX-SILVA6, DANIELY; ROJAS-RUNJAIC, FERNANDO J.M.; LASSO, CARLOS A.; MORALES-BETANCOURT, MONICA A.; CARVALHO, VINICIUS TADEU DE; AMARAL, JOÃO VALSECCHI DO; BALESTRA, RAFAEL A.M.; ACÁCIO, MARIEL; MALVASIO, ADRIANA; LUSTOSA, ANA PAULA G.
The matamatas (Chelus fimbriata and the recently described Chelus orinocensis) are the largest species in the family Chelidae, easily identified by their distinct morphological characteristics. The matamatas have a wide distribution in South America, occurring in Bolivia, Brazil, Colombia, Ecuador, Guyana, French Guiana, Peru, and Venezuela, as well as Trinidad and Tobago. However, there are many gaps in the knowledge of its distribution. The objective of this study was to present new records of occurrence for the C. fimbriata species complex and describe the area of distribution. We compiled data from published papers, databases in museums and other scientific collections, and research institutes and conservation organizations. From these data we mapped the species distribution, considering 3 types of river drainages based on water color in the Amazon Basin. We added 182 new records in Brazil, Venezuela, Colombia, Bolivia, and Peru, demonstrating that the C. fimbriata species complex has a wide distribution, totaling 6,907,551 km2 across all 3 river types. Most records were concentrated in areas lower than 200 m above sea level.
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.