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Garland and colleagues found multiple humpback song types spread repeatedly eastward across western and central South Pacific populations over 11 years.
As reported in: Garland, Goldizen, Rekdahl et al. (2011). Dynamic Horizontal Cultural Transmission of Humpback Whale Song at the Ocean Basin Scale. Current Biology. doi:10.1016/j.cub.2011.03.019
Cholewiak and colleagues reviewed the hierarchical terms used for humpback song (units, phrases, themes) and proposed guidelines for consistently defining phrases.
As reported in: Cholewiak, Sousa‐Lima, Cerchio (2012). Humpback whale song hierarchical structure: Historical context and discussion of current classification issues. Marine Mammal Science. doi:10.1111/mms.12005