CNR, Istituto per l'Ambiente Marino Costiero UOS Capo Granitola, Via del Faro No. 3, 91021 Torretta Granitola (TP), Italy.
J Acoust Soc Am. 2012 Sep;132(3):1792-8. doi: 10.1121/1.4742744.
This study describes the underwater acoustic behavior of the red swamp crayfish Procambarus clarkii. The study was conducted both in a tank and in the natural environment. The tank was equipped with video and acoustic recording systems. Observations were conducted to identify the underwater acoustic signals produced and their association with behavioral events and the movement status of the animals. In a lake in a natural reserve, a remote acoustic recording station was used to study the circadian underwater acoustic activity of the crayfish and to assess the acoustic features of the signals. The red swamp crayfish produces irregular trains of wide-band pulses (duration 0.4 ms, SPL(PK) 128 dB re 1 μPa, peak frequency 28 kHz, bandwidth(RMS) 20 kHz). The production of signals is positively related to intraspecific interactions (encounter/approach, fighting and successive Tail Flips). In the natural environment, acoustic activity is almost absent during the day, increases abruptly at sunset and continues until dawn. This study reveals the previously unknown underwater acoustic signals of Procambarus clarkii and the potential of passive acoustic methods to monitor the presence, the abundance and the behavioral activities of this invasive species.
本研究描述了红沼泽螯虾 Procambarus clarkii 的水下声学行为。该研究在水箱和自然环境中进行。水箱配备了视频和声学记录系统。进行观察以识别产生的水下声信号及其与行为事件和动物运动状态的关联。在自然保护区的一个湖泊中，使用远程声学记录站研究了螯虾的昼夜水下声活动，并评估了信号的声学特征。红沼泽螯虾产生不规则的宽带脉冲序列（持续时间 0.4 ms，SPL(PK)128 dB re 1 μPa，峰值频率 28 kHz，带宽（RMS）20 kHz）。信号的产生与种内相互作用（相遇/接近、战斗和连续的尾巴翻转）呈正相关。在自然环境中，声活动在白天几乎不存在，日落时突然增加，并持续到黎明。本研究揭示了 Procambarus clarkii 以前未知的水下声信号，以及被动声学方法监测这种入侵物种的存在、丰度和行为活动的潜力。
