1. Connor R. C., et al., Trends Ecol. Evol. 13, 228 (1998).
2. Palsbøll P. J., Heide-Jørgensen M. P., Dietz R., Heredity 78, 284 (1997).
3. Although the nucleotide diversity of killer whales in Table 1 uses only North Pacific animals much of the worldwide genetic diversity of this species is in the North Pacific [A. R. Hoelzel Rep. Int. Whaling Comm. 13 (special issue) 225 (1991)].
4. Substitutions per site in the first 400 base pairs (bp) of the mtDNA control region compared with an outgroup the cow are as follows: sperm whale 0.54; pilot whale 0.50; killer whale 0.49; fin whale ( Balaenoptera physalus ) 0.45; minke whale ( B. acutorostrata ) 0.47; and Commerson's dolphin ( Cephalorhynchus commersonii ) 0.46. Sequences are from M. C. Dillon and J. M. Wright [ Mol. Biol. Evol. 10 296 (1993)] and (8) aligned by ClustalW [
5. Higgins D. G., Bleasby A. J., Fuchs R., Comput. Applic. Biosci. 8, 189 (1991);