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Evolution of treefrogs' calls in tropical islands might be under directional selection
Journal of Zoology ( IF 2 ) Pub Date : 2020-05-27 , DOI: 10.1111/jzo.12792
Raoni Rebouças 1, 2 , Guilherme Augusto‐Alves 1, 3 , Luís Felipe Toledo 1
Affiliation  

Animals that present migration restrictions are especially interesting to study isolation effects in the context of island biogeography theory. Among these effects, behavioral traits are one of the least studied subjects. The treefrog Boana albomarginata presents gigantism in some Atlantic islands and, therefore, examining its advertisement calls may be an opportunity to test the Island Rule with a behavioral trait. Hence, we compared calls, body and tympanum sizes of populations of this species in Brazilian islands and mainland sites. We tested if call frequencies of island individuals differed from mainland ones, also considering the influence of body size and its relationship with tympanum diameter. One of the island population had larger body size and lower call frequencies than any other populations. We suggest that to be a result of directional selection. We also observed lack of correlation between body size and advertisement call frequencies in some populations, implying that males and females cannot use calls as a proxy of the calling male's size, which may indicate a rare case of relaxed selection. Therefore, this is the first evidence of relaxed selection in animal communication, as a consequence of recent insularity.

中文翻译:

热带岛屿中树蛙呼声的演变可能在定向选择下

在岛屿生物地理学理论的背景下,具有迁徙限制的动物对于研究隔离效应特别有趣。在这些影响中,行为特征是研究最少的主题之一。蛙蛙Boana albomarginata在某些大西洋岛屿上表现出巨人主义,因此,检查其广告宣传可能是检验行为特征的《岛屿规则》的机会。因此,我们比较了巴西岛屿和大陆站点中该物种的数量,体型和鼓膜大小。我们测试了岛屿个体的呼叫频率是否不同于大陆个体,还考虑了体型的影响及其与鼓膜直径的关系。其中一个岛屿人口的身材比其他任何人群都要大,呼叫频率要低。我们建议将其作为方向选择的结果。我们还观察到在某些人群中,身材大小与广告致电频率之间缺乏相关性,这意味着男性和女性无法使用通话来代替男性来电者的身高,这可能表示罕见的选择不当的情况。因此,这是由于最近的孤立现象而在动物交流中放松选择的第一个证据。
更新日期:2020-05-27
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