Frequency histograms calculated from the acoustic tracks of <i>n</i> = 43 singing humpback whales.

<p>Histograms show the distributions of each measured track parameter: track duration (A), total distance traveled (B), average swimming speed, calculated as the total distance traveled divided by the track duration (C), net displacement (D), and straightness index (E).</p

The acoustic tracks of two singing humpback whales over a 5 h time period.

<p>Song occurred simultaneously for 1.5 h. Blue points indicate the locations of each individual when singing alone; red points indicate the locations of singers while both songs were recorded simultaneously. Times (in EST) when each song session began and ended are indicated on both tracks.</p

Correlation matrix with pairwise comparisons of track parameters.

<p>Parameters are labeled along the diagonal: dist  =  distance traveled (km), dur  =  duration (h), speed  =  average speed (km/h), disp  =  net displacement (km), SI  =  straightness index (unitless). Scatterplots are shown in the lower left triangle below the diagonal; Spearman's rank correlation coefficients are shown in the upper right triangle above the diagonal. Red asterisks indicate significance level: ***<0.001, **<0.01, *<0.05.</p

Occurrence of humpback whale song within Stellwagen Bank National Marine Sanctuary throughout 2009.

<p>Recordings were made across 12 months, and song occurrence is represented as the number of hours per day during which song was detected.</p

Map of the study location in the northwest Atlantic ocean.

<p>The inset shows Stellwagen Bank National Marine Sanctuary outlined in white (A). Black dots indicate the locations of bottom-mounted Marine Autonomous Recording Units deployed from (B) 28 March to 28 May 2009, and (C) 2 October to 15 December 2009. Bathymetry map provided by M. Thompson, Stellwagen Bank National Marine Sanctuary.</p

Comparison of summary statistics for the acoustic tracks of singing humpback whales recorded during the spring and fall seasons.

<p>Spring tracks were recorded between 01 April 2009 and 03 May 2009; fall tracks were recorded between 25 October 2009 and 26 November 2009. Mean, standard deviation (SD), and range (minimum & maximum) are reported for measured track parameters within each season.</p