Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92717, U. S. A. E-mail: email@example.com.
A NEW HYBRID BETWEEN A BLUE WHALE, BALAENOPTERA MUSCULUS, AND A FIN WHALE, B. PHYSALUS: FREQUENCY AND IMPLICATIONS OF HYBRIDIZATION
Version of Record online: 26 AUG 2006
Marine Mammal Science
Volume 14, Issue 1, pages 82–98, January 1998
How to Cite
Bérubé, M. and Aguilar, A. (1998), A NEW HYBRID BETWEEN A BLUE WHALE, BALAENOPTERA MUSCULUS, AND A FIN WHALE, B. PHYSALUS: FREQUENCY AND IMPLICATIONS OF HYBRIDIZATION. Marine Mammal Science, 14: 82–98. doi: 10.1111/j.1748-7692.1998.tb00692.x
- Issue online: 26 AUG 2006
- Version of Record online: 26 AUG 2006
- Received: 6 November 1996 Accepted: 10 December 1996
- fin whale;
- Balaenoptera physalus;
- blue whale;
- Balaenoptera musculus;
- eastern North Atlantic
A female hybrid between a fin (Balaenoptera physalus) and a blue whale (B. mnusculus) was caught in whaling operations in 1984 off northwestern Spain. Its coloration and body proportions were intermediate between those of a fin and a blue whale, although it was anomalously large (19.4 m) when compared to fin whales of similar age (4 yr). It was sexually immature, concomitant with its age but not its length if it were a fin whale. Molecular analyses revealed that the mother of the hybrid was a blue whale and the father a fin whale. Examination of data for the five fin-blue whale hybrids in the literature, plus other anecdotal reports, indicates that hybridization between these two species occurs in various geographic regions and is relatively frequent, notably in light of the absence of reported hybrids between other mysticetes. Either species may act as father or mother, and there does not appear to be a selection for a given sex among the hybrids. The reproductive capacity of these hybrids remains unknown, although incidence of reproductive impairment appears to be higher in hybrid males than in hybrid females.