Amblypygids use a pair of modified walking legs (antenniform) as chemosensory and mechanosensory appendages. At the tip of these legs are covered in chemosensory sensilla, which the animals use to sample odor stimuli in their environment by moving the antenniform leg through the air. We designed a set of experiments to measure the filtering effect that aerodynamic boundary layers have on the temporal and spatial structure of chemical stimuli. In addition, two different species of amblypygids (Paraphrynus laevifrons and Phrynus marginemaculatus) that live in two distinct habitats were used for a comparative analysis. Pulses of a tracer molecule were quantified at different distances and flow velocities using an electrochemical detection system. Temporal attributes of the chemical pulses were extracted and were statistically compared across velocities, distances from the appendage, and the two species. Overall, the boundary layer significantly decreased the concentration and increased the duration of pulses for both species. This filtering effect was more pronounced for P. marginemaculatus than P. laevifrons, as the chemical signal was lower in concentration and longer in duration at any distance from the antenniform leg. It is speculated that the difference in boundary layer filtering, as a function of appendage morphology, is tuned to the different types of odor plumes in these animals' native habitats.

中文翻译：

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比较分析了鞭py（Paraphrynus laevifrons）和Ph（Phrynus marginemaculatus）物种的味觉信号的边界层过滤。

弱视者使用一对改良的步行腿（肾上腺样）作为化学感觉和机械感觉的附属物。这些腿的末端被化学感应器覆盖，动物通过在空中移动触角动物的腿来采样周围环境中的气味刺激。我们设计了一组实验来测量空气动力学边界层对化学刺激的时空结构的过滤效果。此外，还使用了生活在两个不同生境中的两种不同种类的麻痹动物（Paraphrynus laevifrons和Phrynus marginemaculatus）进行比较分析。使用电化学检测系统在不同距离和流速下对示踪分子的脉冲进行定量。提取化学脉冲的时间属性，并在速度，与附肢的距离以及两个物种之间进行统计比较。总体而言，边界层显着降低了两种物质的浓度并增加了脉冲的持续时间。这种边缘化对P. marginemaculatus的影响要比P. laevifrons更为明显，因为化学信号的浓度较低，而距触角腿任何距离的持续时间都较长。据推测，作为附属物形态的函数，边界层过滤的差异被调整为这些动物的原生栖息地中不同类型的气味羽流。这种边缘化对P. marginemaculatus的影响要比P. laevifrons更为明显，因为化学信号的浓度较低，而距触角腿任何距离的持续时间都较长。据推测，作为附属物形态的函数，边界层过滤的差异被调整为这些动物的原生栖息地中不同类型的气味羽流。这种边缘化对P. marginemaculatus的影响要比P. laevifrons更为明显，因为化学信号的浓度较低，而距触角腿任何距离的持续时间都较长。据推测，作为附属物形态的函数，边界层过滤的差异被调整为这些动物的原生栖息地中不同类型的气味羽流。