Of the sound files initially observed, only a limited amount of them had associated dates and locations of where the files were recorded. We looked into the characteristics of these recordings, mainly looking at the depth and ensuring we had some range of depths that could determine our results (Table 1). When viewing the sound files in Raven Pro, we began with Saguenay River in Canada and chose a sound clip that displayed the call structure nicely in the spectrogram. We proceeded to observe the structure of the call and the presence of whistles (Fig. 1). We then observed the spectrogram of Harrison Bay in northern Alaska and also took note of the call structure in a clear sound clip (Fig. 2). We examined the spectrogram of our final location, St. Lawrence River in Canada, and observed the call structure and variations among the call (Fig. 3).
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