Abstract
Singing by males is a major feature of the mating system of humpback whales, Megaptera novaeangliae (Borowski). Although a few songs have been opportunistically recorded on the whales' high-latitude feeding grounds, singing in these regions was thought to be only sporadic. We report results from the first continuous acoustic monitoring of a humpback whale feeding ground (off Cape Cod, MA, USA) in spring. Using autonomous sea-floor recording systems, we found singing on a daily basis over the entire 25 day monitoring period, from 14 May to 7 June 2000. For much of the period, song was recorded 24 h per day. These results, combined with evidence for aseasonal conceptions in whaling catch data, suggest that the humpback whale breeding season should no longer be considered as confined to lower-latitude regions in winter. Rather, we suggest breeding extends geographically and temporally onto feeding grounds into at least spring and early summer. Singing at these times represents either low-cost opportunistic advertising by (perhaps relatively few) males to court females that failed to conceive during the winter, and/or possibly an intrasexual display.
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Selected References
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- Clark C. W., Ellison W. T. Calibration and comparison of the acoustic location methods used during the spring migration of the bowhead whale, Balaena mysticetus, off Pt. Barrow, Alaska, 1984-1993. J Acoust Soc Am. 2000 Jun;107(6):3509–3517. doi: 10.1121/1.429421. [DOI] [PubMed] [Google Scholar]
- Croll Donald A., Clark Christopher W., Acevedo Alejandro, Tershy Bernie, Flores Sergio, Gedamke Jason, Urban Jorge. Only male fin whales sing loud songs. Nature. 2002 Jun 20;417(6891):809–809. doi: 10.1038/417809a. [DOI] [PubMed] [Google Scholar]
- Larsen A. H., Sigurjónsson J., Oien N., Vikingsson G., Palsbøll P. Populations genetic analysis of nuclear and mitochondrial loci in skin biopsies collected from central and northeastern North Atlantic humpback whales (Megaptera novaeangliae): population identity and migratory destinations. Proc Biol Sci. 1996 Nov 22;263(1376):1611–1618. doi: 10.1098/rspb.1996.0236. [DOI] [PubMed] [Google Scholar]
- Norris T. F., McDonald M., Barlow J. Acoustic detections of singing humpback whales (Megaptera novaeangliae) in the eastern North Pacific during their northbound migration. J Acoust Soc Am. 1999 Jul;106(1):506–514. doi: 10.1121/1.427071. [DOI] [PubMed] [Google Scholar]
- Palsbøll P. J., Allen J., Bérubé M., Clapham P. J., Feddersen T. P., Hammond P. S., Hudson R. R., Jørgensen H., Katona S., Larsen A. H. Genetic tagging of humpback whales. Nature. 1997 Aug 21;388(6644):767–769. doi: 10.1038/42005. [DOI] [PubMed] [Google Scholar]
- Payne R. S., McVay S. Songs of humpback whales. Science. 1971 Aug 13;173(3997):585–597. doi: 10.1126/science.173.3997.585. [DOI] [PubMed] [Google Scholar]