Blue World Institute of Marine Research and Conservation, Kaštel 24, Veli Lošinj, Croatia.
Blue World Institute of Marine Research and Conservation, Kaštel 24, Veli Lošinj, Croatia.
Mar Pollut Bull. 2016 Apr 15;105(1):193-8. doi: 10.1016/j.marpolbul.2016.02.030. Epub 2016 Feb 23.
The habitat of the resident bottlenose dolphins (Tursiops truncatus) of the Cres-Lošinj archipelago overlaps with routes of intense boat traffic. Within these waters, Sea Ambient Noise (SAN) was sampled across ten acoustic stations between 2007 and 2009. Data on boat presence was concurrently collected and when dolphins were sighted group behaviour was also recorded. Acoustic recordings were analysed for 1/3 octave bands. Samples containing dolphin whistles were analysed and compared with boat presence and SAN levels. Results indicate that dolphins whistle at higher frequencies in conditions of elevated low frequency noise. Conversely, they reduce maximum, delta and start frequencies and frequency modulations when noise levels increase significantly across higher frequencies. The study shows that high levels of SAN causes significant changes in the acoustic structure of dolphin whistles. Additionally, changes in whistle parameters, in the presence of boats, appear to be related to the behavioural state of the dolphin group.
克雷斯-洛希尼群岛的居留宽吻海豚（Tursiops truncatus）的栖息地与船只交通繁忙的路线重叠。在这些水域中，于 2007 年至 2009 年在十个声纳站采集了海洋环境噪声（SAN）数据。同时收集了船只存在的数据，当观察到海豚时，还记录了它们的群体行为。对 1/3 倍频带的声纳记录进行了分析。分析了包含海豚哨声的样本，并将其与船只存在和 SAN 水平进行了比较。结果表明，海豚在低频噪声升高的情况下会发出更高频率的哨声。相反，当高频噪声显著增加时，它们会降低最大、德尔塔和起始频率以及频率调制。该研究表明，高水平的 SAN 会导致海豚哨声的声学结构发生显著变化。此外，在船只存在的情况下，哨声参数的变化似乎与海豚群体的行为状态有关。
