Encontrados 30 documentos, a visualizar página 1 de 3
Comparative cytogenetics of nine populations of the Rhinella genus (Anura, Bufo...
Bruschi, Daniel Pacheco; Sousa, Deborah Yasmim; Soares, Amanda A.; Carvalho, Klélia Aparecida de; Busin, Carmen Sílvia; Ficanha, Natália CristineThe genus Rhinella is one of the most diverse groups of bufonid toads, currently composed by 93 valid species and naturally distributed throughout different Neotropical ecoregions. Here, we analyze nine Brazilian populations of toads representing species of the Rhinella margaritifera and Rhinella marina groups. These new data include the first description of the R. hoogmoedi and R. proboscidae karyotypes, as we...
Comparative cytogenetic analysis of some species of the Dendropsophus microceph...
Medeiros, Lilian Ricco; Louren?o, Luciana Bolsoni; Rossa-Feres, Denise de Cerqueira; Lima, Albertina Pimental; Andrade, Gilda VasconcellosBackground: Dendropsophus is a monophyletic anuran genus with a diploid number of 30 chromosomes as an important synapomorphy. However, the internal phylogenetic relationships of this genus are poorly understood. Interestingly, an intriguing interspecific variation in the telocentric chromosome number has been useful in species identification. To address certain uncertainties related to one of the species group...
The costs of evaluating species densities and composition of snakes to assess d...
Fraga, Rafael de; Stow, Adam J.; Magnusson, William Ernest; Lima, Albertina PimentalStudies leading to decision-making for environmental licensing often fail to provide accurate estimates of diversity. Measures of snake diversity are regularly obtained to assess development impacts in the rainforests of the Amazon Basin, but this taxonomic group may be subject to poor detection probabilities. Recently, the Brazilian government tried to standardize sampling designs by the implementation of a sy...
Acoustic interference and recognition space within a complex assemblage of dend...
Amézquita, Adolfo; Flechas, Sandra V.; Lima, Albertina Pimental; Gasser, Herbert; Hödl, WalterIn species-rich assemblages of acoustically communicating animals, heterospecific sounds may constrain not only the evolution of signal traits but also the much less-studied signal-processing mechanisms that define the recognition space of a signal. To test the hypothesis that the recognition space is optimally designed, i.e., that it is narrower toward the species that represent the higher potential for acoust...
Cytogenetics and sperm ultrastructure of Atelopus spumarius (Anura, Bufonidae) ...
Siqueira, Sérgio; Aguiar-Júnior, Odair; Lima, Albertina Pimental; Pimentel, Shirlei Maria ReccoThe current taxonomy of most Atelopus species is based on morphological and color data only. Recent studies suggest that A. spumarius may represent a species complex assigned under the same name. Karyotypic data and description of sperm ultrastructure for 13 specimens of A. spumarius are presented here for the first time. A chromosomal analysis revealed 2n = 22 chromosomes, with centromeric heterochromatin in a...
Decoupled evolution between senders and receivers in the neotropical Allobates ...
Betancourth-Cundar, Mileidy; Lima, Albertina Pimental; Hödl, Walter; Amézquita, AdolfoDuring acoustic communication, an audible message is transmitted from a sender to a receiver, often producing changes in behavior. In a system where evolutionary changes of the sender do not result in a concomitant adjustment in the receiver, communication and species recognition could fail. However, the possibility of an evolutionary decoupling between sender and receiver has rarely been studied. Frog populati...
Calls, colours, shape, and genes: A multi-trait approach to the study of geogra...
Amézquita, Adolfo; Lima, Albertina Pimental; Jehle, Robert; Castellanos, Lina; Ramos, Óscar; Crawford, Andrew J.; Gasser, Herbert; Hödl, WalterEvolutionary divergence in behavioural traits related to mating may represent the initial stage of speciation. Direct selective forces are usually invoked to explain divergence in mate-recognition traits, often neglecting a role for neutral processes or concomitant differentiation in ecological traits. We adopted a multi-trait approach to obtain a deeper understanding of the mechanisms behind allopatric diverge...
Distribution extension of Hyalinobatrachium cappellei (van Lidth de Jeude, 1904...
Simões, Pedro Ivo; Kaefer, Igor L.; Gomes, Felipe Bittioli Rodrigues; Lima, Albertina PimentalWe report the occurrence of the centrolenid frog Hyalinobatrachium cappellei in Careiro, Amazonas, Brazil (Central Amazonia). Our records reduce a gap of approximately 1,500 km between the closest known records for this glassfrog, and confirm H. cappellei as geographically widespread in the Amazon Basin. © 2012 Check List and Authors.
A new species of Amazonian snouted treefrog (Hylidae: Scinax) with description ...
Ferrão, Miquéias; Fraga, Rafael de; Moravec, Ji?í; Kaefer, Igor L.; Lima, Albertina PimentalThe genus Scinax is one of the most specious genera of treefrogs of the family Hylidae. Despite the high number of potential new species of Scinax revealed in recent studies, the rate of species descriptions for Amazonia has been low in the last decade. A potential cause of this low rate may be the existence of morphologically cryptic species. Describing new species may not only impact the taxonomy and systemat...
Hierarchical effects of historical and environmental factors on lizard assembla...
Peixoto, Gabriela; Fraga, Rafael de; Araújo, Maria C.; Kaefer, Igor L.; Lima, Albertina PimentalInvestigating the role of historical and ecological factors structuring assemblages is relevant to understand mechanisms and processes affecting biodiversity across heterogeneous habitats. Considering that community assembly often involves scale-dependent processes, different spatial scales may reveal distinct factors structuring assemblages. In this study we use arboreal and leaf-litter lizard abundance data f...