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. 2014 Apr;10(4):20140175. doi: 10.1098/rsbl.2014.0175

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© 2014 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Bio-duck and downsweep sounds compared between different recording locations. Bio-duck: (a) Wilhelmina Bay (14 February 2013; 64°41′ S, 62°13′ W; acoustic recording tag; SR: 25 811 Hz; filtered and downsampled to 2000 Hz; FFT: 512; 95% overlap; Hanning window); (b) PALAOA station (22 July 2006; 70°31′ S, 8°13′ W; long-term recorder; SR: 48 000 Hz; filtered and downsampled to 2000 Hz; FFT: 512; 95% overlap; Hanning window); (c) Dumont D'Urville (3 June 2006; 65°33′ S, 140°32′ E; long-term recorder; SR: 4000 Hz; filtered and downsampled to 2000 Hz; FFT: 512; 95% overlap; Hanning window). Downsweeps: (d) Wilhelmina Bay (13 February 2013; 64°41′ S, 62°13′ W; acoustic recording tag; SR: 25811 Hz; FFT: 4096; 95% overlap; Hanning window); (e) Ross Island (22 November 1964; 77°30′ S, 168°00′ E; opportunistic recording; SR: 2000 Hz; FFT: 512; 95% overlap; Hanning window); (f) PALAOA station (22 July 2006; 70°31′ S, 8°13′ W; long-term recorder; SR: 48 000 Hz; filtered and downsampled to 2000 Hz; FFT: 512; 95% overlap; Hanning window) (see the electronic supplemental material for all sound files). (Online version in colour.)