Morphological characteristics are known to be important predictors of victory in aggressive disputes in the animal world. Among anurans, however, acoustic communication also plays an important role in intrasex conflicts. Although there is evidence for the influence of spectral parameters of calls (e.g., fundamental and dominant frequencies) in anuran disputes, the role that temporal parameters (e.g., duration and repetition rate) play in success during physical conflicts is still poorly understood. We describe the behavior of male frogs in agonistic interactions and investigate the functions of the different types of calls emitted in different social contexts. We also evaluate how body characteristics (mass and body size) and bioacoustic characteristics (repetition rate of the calls) influence success in physical conflicts of Pithecopus nordestinus (Anura: Phyllomedusidae). Agonistic disputes involved gradation in the emission of calls, visual displays, and physical clashes. The fighting call increased in proportion during clashes, indicating a function associated with aggression/intimidation. The uneasiness call (new subcategory herein defined) was only performed by losers during physical clashes, suggesting a meaning of submission or restlessness. No differences were found in any of the morphological parameters between winners and losers of physical disputes. On the other hand, the repetition rate of the aggressive call was positively related to success in fights and proved to be a good predictor of success in fights between males of P. nordestinus. Our results contribute to understanding the influence of temporal parameters of calls on success in physical disputes of this Neotropical treefrog.

Natural areas within cities are important as they contribute to maintain biodiversity and the functioning of ecosystems. In Ceará state, inventories of birds in human-impacted areas are still scarce. Here, we inventory bird species and estimate the species richness at Parque Ecológico Lagoa da Fazenda, an urban park in the municipality of Sobral, in northeastern Brazil. We found 82 bird species, of which 16 breed in the area, three are endemics, and three others are introduced. Despite the moderate species richness detected, richness estimators revealed that sampling was sufficient to detect most species. To maintain or even increase local species richness, we suggest the cessation of urban expansion within the park, sewage dumping, and filling of the wetland, as well as further planting of native vegetation.

We expand the distribution of Tupinambis teguixin to the Caatinga biome, and report the first record of this species in Ceará state, northeastern Brazil. We found T. teguixin at a typical Caatinga habitat, approximately 215 km from the nearest locality with known record of the species. Our findings expand the knowledge of Caatinga’s herpetofauna, reinforcing the deficiency of information from several areas, and the necessity of additional surveys in this biome.

Animal monitoring research involving mark-recapture techniques increasingly requires non-invasive methods of individual identification. The photographic identification method (PIM) is an excellent tool for this purpose and has been applied successfully to many taxa. However, the utility of PIM is a function of species-specific features that are judged suitable for a given target-species. Herein, the suitability of inguinal color patterns for photo identification of individuals of Pithecopus gonzagai are evaluated by comparing two widely used computer-assisted photographic matching programs (I³S and Wild.ID). Both programs accurately identified more than 70% of individuals in the top 20 potential matching photographs. Wild.ID was slightly better than I³S in matching efficiency and has a faster processing time. Thus, PIM is useful to identify individual P. gonzagai; however, before implementing the technique in animal-monitoring studies of other taxa, one must evaluate the suitability PIM for the target species and calibrate the relative efficiency of the software programs in identifying individuals.