Efeito da temperatura sobre o canto de advertência de Pleurodema tucumanum (Anura: Leiuperidae)

Abstract

Temperature effect on the advertisement call of Pleurodema tucumanum (Anura: Leiuperidae). The advertisement call represents an important character to discriminate species, mainly between sibling species. The genus Pleurodema has cryptic species, therefore its acoustical characteristics could represent an useful tool to solve taxonomic problems. It is expected that the advertisement call acoustic properties of the amphibian anurans will vary with the temperature because the frogs are ectotherms. We evaluated the effect of temperature in the acoustic variables of the advertisement call of Pleurodema tucumanum. The inter-call interval, number of pulses per call, inter-pulse interval and pulse rate showed covariation with temperature, whereas the call duration, pulse duration and dominant frequency were temperature-independent. The advertisement call of P. tucumanum corresponds to a single periodic pulse train. The call showed an average duration of 289 ms, dominant frequency of 2552 Hz and 35 pulses of 2.38 ms at 22˚C. The number of pulses increased with temperature. The discrimination of exogenous variability from the acoustic components allows one to analyze the intrinsic variability of the advertisement calls.Keywords: bioacoustic analysis, linear regression model, single periodic pulse train. ResumenEfecto de la temperatura en el canto de advertencia de Pleurodema tucumanum (Anura: Leiuperidae). El canto de advertencia es un carácter importante que permite discriminar especies, principalmente entre especies simpátricas. El género Pleurodema poseen especies crípticas y por lo tanto, sus características acústicas podrían representar una herramienta útil para resolver problemas taxonómicos. Es esperado que las propiedades acústicas del canto de advertencia de los anfibios anuros varíen con la temperatura debido a su condición ectotérmica. Nosotros evaluamos el efecto de la temperatura en las variables acústicas del canto de advertencia de Pleurodema tucumanum. Las variables intervalo entre cantos, número de pulsos por canto, intervalo entre pulsos y tasa de pulsos mostraron covariación con la temperatura, mientras que las variables duración del canto, duración del pulso y frecuencia dominante resultaron temperatura-independientes. El canto de advertencia de P. 126

On the occurrence of Scinax kennedyi (Pyburn, 1973) (Anura, Hylidae) in the state of Roraima, northern Brazil

“…Nevertheless, such small variation in temporal trait values may be explained by the considerable difference in temperature (ca. 3℃) between both localities (Appendix 2; Table 1), since it is known that temperature may exert considerable influence on such fine-scale temporal traits of advertisement calls of frogs (Gerhardt, 1994;Valetti & Martino, 2012;Köhler et al, 2017). In addition to this, males from Brazil matched the morphological diagnosis provided for S. kennedyi in Pyburn (1973), thus corroborating the acoustic identification.…”

Multivariate species boundaries and conservation of harlequin poison frogs

“…Now, it is widely accepted that the chemical structure of defensive alkaloids is highly influenced by diet composition (temporally and spatially; Saporito, Donnelly, Garraffo, Spande, & Daly, ) and should not be considered a taxonomic criteria, at least, in dendrobatid species. Although the presumably importance of calling songs for intraspecific mating success (reproductive isolation), this trait has been found to be influenced by environmental factors in other anurans (Esteban, Sánchez‐Herráiz, Barbadillo, Castanet, & Márquez, ; Valetti & Martino, ) and should also be used with caution for taxonomic purposes.…”