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Spatio-Temporal Patterns of Beaked Whale Echolocation Signals in the North Pacific

Figure 5

Diel cycle of Cross beaked whale (BWC), M. densirostris (Md), Z. cavirostris (Zc), and M. hotaula (Mh) pooled over all sites and geographic regions (top panel), as well as for Md and Zc at select sites.

Dark shaded areas indicate nighttime. BWC displayed a clear nocturnal activity over all sites, Mh had a diel pattern with higher acoustic activity during the day, Zc had a slight diel pattern with higher activity from after midnight to mid-day over all sites, particularly pronounced at Pearl and Hermes Reef and SOCAL H. Md did not have a diel pattern, except at Hawai’i, where the pattern was similar to Zc.

Figure 5