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Spatial and temporal trends in fin whale vocalizations recorded in the NE Pacific Ocean between 2003-2013

Fig 5

Monthly two-dimensional histograms of IPI and frequency for the Axial OBH from 2006–2013.

Frequency is plotted along the x-axis and inter-pulse interval (IPI) along the y-axis. Colors correspond to density of calls in 1-s 1-Hz areas of the plot as a percentage of the total calls in the month (white labels).

Fig 5

doi: https://doi.org/10.1371/journal.pone.0186127.g005