ADVERTISEMENT‐CALL PREFERENCES IN DIPLOID‐TETRAPLOID TREEFROGS (HYLA CHRYSOSCELIS AND HYLA VERSICOLOR): IMPLICATIONS FOR MATE CHOICE AND THE EVOLUTION OF COMMUNICATION SYSTEMS
ADVERTISEMENT‐CALL PREFERENCES IN DIPLOID‐TETRAPLOID TREEFROGS (HYLA CHRYSOSCELIS AND HYLA VERSICOLOR): IMPLICATIONS FOR MATE CHOICE AND THE EVOLUTION OF COMMUNICATION SYSTEMS
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DOI：
10.1111/j.0014-3820.2005.tb00998.x
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发表时间：
2005-02
期刊：
影响因子：
3.3
通讯作者：
H. Gerhardt
中科院分区：
文献类型：
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作者：
H. Gerhardt
用于配偶选择和接收者偏好的信号通常被认为以锁步的方式共同进化。然而，发送者-接收者的共同进化也可能是非平行的：即使物种信号的差异主要是数量上的，一些密切相关物种的雌性也有质量上不同的偏好和潜在机制。利用精细尺度时间特性不同的合成叫声进行选择性回放实验，确定了黄花水螅（Hyla chrysoscelis）雌性的接受者标准，并将其与一个隐型四倍体物种（H. versicolor）的雌性标准进行了比较；详细的偏好函数也产生了基于自然模式变化的时间属性的两个物种。该物种在三个方面是相似的：(1)恒定频率的脉冲与同种叫声的典型频率调制脉冲一样有吸引力；(2)雄性鸣叫的偏好变化与温度相关；(3)偏好函数是单峰的，在同一呼叫中，估计的峰值值略高于估计的平均值。物种间也存在差异：(1)黄胚石麻的偏好函数斜率大于花斑石麻；(2)相较于花斑棉，黄胚棉的偏好与强度无关；(3)脉冲速率和形状的差异对花斑田鼠的偏好强度有协同效应，而对黄胚田鼠则无协同效应；(4)对同种鸣叫的脉冲形状的偏好在种典型脉冲持续时间上表现出来，而在黄胚绒猴中则没有。然而，当对比平均脉冲更长的脉冲进行测试时，雌性黄胚孢子虫确实表现出基于脉冲形状的偏好，这表明一种假设可以解释一些非平行共同进化的例子。也就是说，偏好可以被隐藏或显示，这取决于信号属性相对于解决该属性差异的阈值的定量变化方向。这里报告的实验结果也预测了当代种群内部和种群之间的择偶模式。首先，这两个物种的种内配偶选择预计会受到呼叫者之间温度变化的强烈影响。其次，在脉冲速率和脉冲形状上同时存在差异，才能使花斑拟南蝽的雌性进行有效的物种识别，而黄胚拟南蝽的雌性则不需要。第三，在种群内存在更大的性别选择的可能性，并且在其他地理位置较远的种群中，对雄性发出的叫声的歧视，在黄胚毛瓢虫中比在花色瓢虫中存在更大的可能性。
Abstract Signals used for mate choice and receiver preferences are often assumed to coevolve in a lock‐step fashion. However, sender‐receiver coevolution can also be nonparallel: even if species differences in signals are mainly quantitative, females of some closely related species have qualitatively different preferences and underlying mechanisms. T o‐alternative playback experiments using synthetic calls that differed in fine‐scale temporal properties identified the receiver criteria in females of the treefrog Hyla chrysoscelis for comparison with female criteria in a cryptic tetraploid species (H. versicolor); detailed preference functions were also generated for both species based on natural patterns of variation in temporal properties. The species were similar in three respects: (1) pulses of constant frequency were as attractive as the frequency‐modulated pulses typical of conspecific calls; (2) changes in preferences with temperature paralleled temperature‐dependent changes in male calls; and (3) preference functions were unimodal, with weakly defined peaks estimated at values slightly higher than the estimated means in conspecific calls. There were also species differences: (1) preference function slopes were steeper in H. chrysoscelis than in H. versicolor; (2) preferences were more intensity independent in H. chrysoscelis than in H. versicolor; (3) a synergistic effect of differences in pulse rate and shape on preference strength occurred in H. versicolor but not in H. chrysoscelis; and (4) a preference for the pulse shape typical of conspecific calls was expressed at the species‐typical pulse duration in H. versicolor but not in H. chrysoscelis. However, females of H. chrysoscelis did express a preference based on pulse shape when tested with longer‐than‐average pulses, suggesting a hypothesis that could account for some examples of nonparallel coevolution. Namely, preferences can be hidden or revealed depending on the direction of quantitative change in a signal property relative to the threshold for resolving differences in that property. The results of the experiments reported here also predict patterns of mate choice within and between contemporary populations. First, intraspecific mate choice in both species is expected to be strongly influenced by variation in temperature among calling males. Second, simultaneous differences in pulse rate and pulse shape are required for effective species discrimination by females of H. versicolor but not by females of H. chrysoscelis. Third, there is greater potential for sexual selection within populations and for discrimination against calls produced by males in other geographically remote populations in H. chrysoscelis than in H. versicolor.