. Kato, National Research Institute of Far Seas Fisheries, Shizuoka) for helpful comments

U. Arnason and A. Gullberg, Comparison between the complete mtDNA sequences of the blue and the fin whale, two species that can hybridize in nature, J. Mol. Evol, vol.37, pp.312-322, 1993.

C. S. Baker, L. Florez-gonzalez, B. Abernethy, H. C. Rosenbaum, R. W. Slade et al., MITOCHONDRIAL DNA VARIATION AND MATERNAL GENE FLOW AMONG HUMPBACK WHALES OF THE SOUTHERN HEMISPHERE, Marine Mammal Science, vol.15, issue.4, pp.721-737, 1998.
DOI : 10.2307/2408641

J. L. Bannister, Baleen whales. Pages 62?72 in The encyclopedia of marine mammals, 2002.
DOI : 10.1006/rwos.2001.0429

M. Bérubé and A. Aguilar, A NEW HYBRID BETWEEN A BLUE WHALE, BALAENOPTERA MUSCULUS, AND A FIN WHALE, B. PHYSALUS: FREQUENCY AND IMPLICATIONS OF HYBRIDIZATION, Marine Mammal Science, vol.11, issue.1, pp.82-98, 1998.
DOI : 10.1146/annurev.genet.28.1.283

E. Clua, Présence et mort d'une baleine bleue sur les côtes néo-calédoniennes: Quels enseignements scientifiques en tirer? Bull, Méd. Calédonien Polynésien, vol.28, pp.25-29, 2002.

J. David, E. Clua, P. Borsa, P. Larue, and B. Civet, Va-t-elle mourir à Prony? Nouv, Calédoniennes, vol.9217, pp.1-3, 2002.

C. Garrigue, E. Clua, and D. Breitenstein, Identification of a juvenile pygmy blue whale in New Caledonia, South-West Pacific, Int. Whaling Comm. Pap. SC, vol.55, p.4, 2003.

P. C. Gill, A blue whale (Balaenoptera musculus) feeding ground in a southern Australian coastal upwelling zone, J. Cetacean Res. Manage, vol.4, pp.179-184, 2002.

G. Hoarau, A. J. Rinjsdorp, H. W. Van-der-weer, W. T. Stam, and J. L. Olsen, Population structure of plaice (Pleuronectes platessa L.) in northern Europe: microsatellites revealed large-scale spatial and temporal homogeneity, Molecular Ecology, vol.25, issue.7, pp.1165-1176, 2002.
DOI : 10.1038/35059079

T. Ichihara, The pygmy blue whale Balaenoptera musculus brevicauda, a new subspecies from the Antarctic. Pages 79?113 in, 1966.

H. Kato, T. Miyashita, and H. Shimada, Segregation of the two sub-species of the blue whale in the Southern Hemisphere, Rep. Int. Whaling Comm, vol.45, pp.273-283, 1995.

H. Kato, H. Okamura, A. Nomura, and E. Kojima, Body length distribution and sexual maturity of southern blue whale, with special reference to sub-species separation, Int. Whaling Comm. Pap. SC, vol.52, p.4, 2000.

H. Kato, Y. Honno, H. Yoshida, E. Kojima, A. Nomura et al., Further developments on morphological and behavioural key for sub-species discrimination of Southerm blue whales, Int. Whaling Comm. Pap. SC, vol.54, p.8, 2002.

T. Kimura, T. Ozawa, and L. A. Pastene, SAMPLE PREPARATION AND ANALYSIS OF MITOCHONDRIAL DNA FROM WHALE BALEEN PLATES, Marine Mammal Science, vol.16, issue.3, pp.495-498, 1997.
DOI : 10.1073/pnas.86.16.6196

R. G. Leduc, A. E. Dizon, M. Goto, L. A. Pastene, R. L. Brownell et al., Patterns of genetic variation in southern hemisphere blue whales, Int. Whaling Comm. Pap. SC, vol.55, p.9, 2003.

H. Omura, T. Ichihara, and T. Kasuya, Osteology of pygmy blue whale with additional information on external and other characteristics, Sci. Rep. Whales Res. Inst. Tokyo, vol.22, pp.1-27, 1970.

S. Palumbi, A. Martin, S. Romano, W. O. Mcmillan, L. Stice et al., The simple fool's guide to PCR, v. 2.0. University of Hawai, 1991.

R. R. Reeves, S. Leatherwood, G. S. Stone, and L. G. Eldredge, Marine mammals in the area served by the South Pacific Regional Environment Programme (SPREP) SPREP, 1999.

D. W. Rice, Marine mammals of the world: Systematics and distribution, Soc. Mar. Mamm. Spec. Publ, vol.4, pp.1-231, 1998.

R. Sears, Blue whale. Pages 112?116 in The encyclopedia of marine mammals, 2002.
DOI : 10.1016/b978-0-12-373553-9.00033-x

S. J. Tebbutt, R. E. Stewart, and D. F. Hill, Isolation and characterisation of DNA from whale bone, Journal of the Royal Society of New Zealand, vol.11, issue.4, pp.365-371, 2000.
DOI : 10.1111/j.1365-294X.1996.tb00301.x

N. J. Van-der-merwe, Reconstructing prehistoric diet. Pages 369?372 in S The Cambridge encyclopedia of human evolution, 1992.