Sound spectra from study of Great Bowerbird bower male sound arrival in bower avenue

Sexual selection can result in extreme development of multimodal
mate-attracting traits, including complex constructions.  Male
great bowerbirds build bowers for attracting females.  Bowers
contain a thatched twig tunnel (avenue) opening onto two courts covered
with decorations.  Males displaying on a court are seen by a
female from within the avenue.  She sees and hears displays
through the avenue entrance but can only see the male's head and
objects in his bill as it passes repeatedly across the entrance. 
Because the bower may affect the auditory as well as the visual parts of
the multimodal male display we investigated bower acoustic properties by
playing standard sounds from multiple court positions, recording the
resulting sounds at the female's head position within the
avenue.  Bower geometry results in a limited zone at the avenue
entrance where his vocalisations can be heard with maximum intensity; this
corresponds to his typical display position.  Experiments show
that court decorations increase the intensity of some frequencies and
reduce the intensity of others. Bower structure simultaneously affects
both visual and auditory male display components and could be important in
sexual selection.  It is important to consider more than one
sensory mode, especially in the context of built signalling structures.
This is the data, corrected for position 1, used in the analysis. It also
includes a sample R script to run an analysis to show how the GAM was
done.  The original article has been accepted to Behavioural
Ecology: Acoustic effects complement visual displays of Great Bowerbird
bowers, by John A. Endler, Selina Meehan, Aida Rodrigues, and Vicki
Hallett, Behavioral Ecology (in press 2024).

性选择可促使多模态求偶特征（包括复杂构筑结构）得到极致演化。雄性大亭鸟（Great Bowerbird）会搭建求偶亭（bower）以吸引雌性。求偶亭包含一条由茅草细枝构筑的通道（avenue），通道衔接两处铺有装饰的展示庭院。在展示庭院中进行求偶展示的雄性，会被通道内的雌性观察到。雌性可通过通道入口观察并聆听雄性的展示，但仅能看到雄性的头部，以及其喙中反复掠过入口的衔取物品。
鉴于求偶亭可能同时影响雄性多模态展示的听觉与视觉维度，本研究通过在多个展示庭院位置播放标准声源，并在通道内雌性头部所处的位置录制所得音效，对求偶亭的声学特性展开了探究。求偶亭的几何结构会在通道入口处形成一个有限区域，在此区域内雄性的鸣唱可被最大化地接收；该区域恰好对应雄性常规的展示站位。实验表明，展示庭院的装饰可提升部分频段的声强，同时削弱另一些频段的声强。
求偶亭的结构会同时影响雄性展示的视觉与听觉维度，这或许在性选择过程中发挥关键作用。因此，在研究构筑型信号结构时，需同时考量多种感官模态，这一点至关重要。
本数据集为经过位置1校正后的分析用数据，同时附带一份用于演示广义可加模型（Generalized Additive Model，GAM）分析流程的R脚本示例。本文原创研究论文《声学效应对大亭鸟求偶亭视觉展示的补充作用》（原标题：Acoustic effects complement visual displays of Great Bowerbird bowers）已被《行为生态学》（Behavioral Ecology）接收，将于2024年刊出，作者为John A. Endler、Selina Meehan、Aida Rodrigues及Vicki Hallett。