Department of Biology, Saint Mary's College, Notre Dame, Indiana 46556, USA.
National Marine Mammal Foundation, 2240 Shelter Island Drive, #200, San Diego, California 92106, USA.
J Acoust Soc Am. 2019 Mar;145(3):1341. doi: 10.1121/1.5093636.
Echolocating bats and odontocetes face the potential challenge of acoustic interference from neighbors, or sonar jamming. To counter this, many bat species have adapted jamming avoidance strategies to improve signal detection, but any such avoidance strategies in dolphins is unknown. This study provides an investigation into whether dolphins modify echolocation behavior during jamming scenarios. Recorded echolocation clicks were projected at different click repetition rates and at different aspect angles relative to two dolphins' heads while each dolphin was performing a target detection task. Changes in the timing, amplitude, and frequency of structure of the dolphin's emitted signals were compared to determine if and how dolphins modify echolocation when faced with potentially interfering conspecific echolocation signals. The results indicate that both dolphins demonstrated different responses when faced with jamming scenarios, which may reflect optimal strategies according to individual auditory perception abilities.
回声定位蝙蝠和齿鲸面临着来自邻居的潜在声学干扰或声纳干扰的挑战。为了应对这种情况，许多蝙蝠物种已经适应了避免干扰的策略，以提高信号检测能力，但海豚是否有任何此类避免干扰的策略尚不清楚。本研究旨在调查海豚是否在干扰情况下改变回声定位行为。当两只海豚在执行目标检测任务时，以不同的点击重复率和相对于海豚头部的不同方位角投影记录的回声定位点击，比较海豚发出信号的定时、幅度和频率结构的变化，以确定海豚在面对潜在干扰的同种回声定位信号时是否以及如何改变回声定位。结果表明，当面对干扰情况时，两只海豚都表现出不同的反应，这可能反映了根据个体听觉感知能力的最佳策略。
