Avian sound propagation in three Michigan Forests, 2022

In three forest types, dry-mesic northern forest, rich conifer swamp, and boreal forest, we recorded pure tones within songbirds’ auditory range (2 to 8 KHz) at 6 different distances along a transect and quantified different aspects of the vegetation through which the pure tones traveled. Four transects per forest type were used and sounds were recorded at two different heights (1 and 5 m). Linear regression analysis was used to determine if the pure tones were attenuated differently along transects, between sampling heights, and across forest types.本研究针对中旱生北部森林、富养针叶林沼泽以及寒温带针叶林三种森林类型开展实验：沿每条样带（transect）设置6个不同距离测点，记录鸣禽听觉频段（2至8 KHz）内的纯音，并量化纯音传播途经的植被各项特征。每种森林类型布设4条样带，且在1米与5米两个不同高度录制声音。采用线性回归分析，探究纯音在样带间、采样高度间以及不同森林类型间的声衰减是否存在显著差异。