Valetti Julián Alonso, Salas Nancy Edith, Martino Adolfo Ludovico
Ecologia, Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Fisico-Quimicas y Naturales, Universidad Nacional de Rio Cuarto, Ruta Nacional No 8-km 601, (X5804BYA) Rio Cuarto, Argentina
Rev Biol Trop. 2013 Mar;61(1):273-80.
The advertisement call plays an important role in the life history of anuran amphibians, mainly during the breeding season. Call features represent an important character to discriminate species, and sound emissions are very effective to assure or reinforce genetic incompatibility, especially in the case of sibling species. Since frogs are ectotherms, acoustic properties of their calls will vary with temperature. In this study, we described the advertisement call of C. cranwelli, quantifying the temperature effect on its components. The acoustic emissions were recorded during 2007 using a DAT record Sony TCD-100 with stereo microphone ECM-MS907 Sony and tape TDK DAT-RGX 60. As males emit their calls floating in temporary ponds, water temperatures were registered after recording the advertisement calls with a digital thermometer TES 1300+/-0.1 degreeC. Altogether, 54 calls from 18 males were analyzed. The temporal variables of each advertisement call were measured using oscillograms and sonograms and the analyses of dominant frequency were performed using a spectrogram. Multiple correlation analysis was used to identify the temperature-dependent acoustic variables and the temperature effect on these variables was quantified using linear regression models. The advertisement call of C. cranwelli consists of a single pulse group. Call duration, Pulse duration and Pulse interval decreased with the temperature, whereas the Pulse rate increased with temperature. The temperature-dependent variables were standardized at 25 degreeC according to the linear regression model obtained. The acoustic variables that were correlated with the temperature are the variables which emissions depend on laryngeal muscles and the temperature constraints the contractile properties of muscles. Our results indicated that temperature explains an important fraction of the variability in some acoustic variables (79% in the Pulse rate), and demonstrated the importance of considering the effect of temperature in acoustic components. The results suggest that acoustic variables show geographic variation to compare data with previous works.
求偶鸣叫在无尾两栖动物的生活史中起着重要作用，主要是在繁殖季节。鸣叫特征是区分物种的一个重要特征，声音排放对于确保或加强遗传不相容性非常有效，特别是在亲缘物种的情况下。由于青蛙是变温动物，它们鸣叫的声学特性会随温度而变化。在本研究中，我们描述了克兰韦尔角蛙（C. cranwelli）的求偶鸣叫，量化了温度对其组成部分的影响。2007年期间，使用带有立体声麦克风ECM-MS907索尼的DAT录音机索尼TCD-100和磁带TDK DAT-RGX 60记录声学排放。由于雄性在临时池塘中漂浮时发出鸣叫，在用数字温度计TES 1300（精度为±0.1摄氏度）记录求偶鸣叫后记录水温。总共分析了来自18只雄性的54次鸣叫。使用波形图和频谱图测量每个求偶鸣叫的时间变量，并使用频谱图进行主频分析。使用多重相关分析来识别与温度相关的声学变量，并使用线性回归模型量化温度对这些变量的影响。克兰韦尔角蛙的求偶鸣叫由单个脉冲组组成。鸣叫持续时间、脉冲持续时间和脉冲间隔随温度降低，而脉冲率随温度升高。根据获得的线性回归模型，将与温度相关的变量在25摄氏度下进行标准化。与温度相关的声学变量是其排放依赖于喉部肌肉的变量，并且温度限制了肌肉的收缩特性。我们的结果表明，温度解释了一些声学变量变异性的重要部分（脉冲率中为79%），并证明了在声学成分中考虑温度影响的重要性。结果表明，声学变量存在地理变异，以便与以前的研究数据进行比较。
