Population structure of odd‐broodline Asian pink salmon and its contrast to the even‐broodline structure

• Published in: Journal of Fish Biology
• Main Authors: Hawkins, S. L., Varnavskaya, N. V., Matzak, E. A., Efremov, V. V., Guthrie, C. M., Wilmot, R. L., Mayama, H., Yamazaki, F., Gharrett, A. J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2002
• Subjects: Kamchatka Peninsula; Okhotsk; Kamchatka; Oncorhynchus gorbuscha; Pink salmon; Sakhalin
• Online Access: http://dx.doi.org/10.1111/j.1095-8649.2002.tb00287.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2002.tb00287.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2002.tb00287.x

Most of the variation (99%) of Asian odd‐broodline pink salmon Oncorhynchus gorbuscha , based on data at 32 variable (46 total) allozyme loci from 35 populations, occurred within populations. The remaining interpopulation variation was attributable to: (1) differences between northern (the northern Sea of Okhotsk, eastern Kamchatka Peninsula and western Kamchatka Peninsula) and southern (Hokkaido Island, Kuril Islands and Sakhalin Island) populations; (2) differences between the southern areas; (3) low variation among populations within some areas. The pattern contrasted strongly with that observed for Asian even‐broodline populations, which had a strong structure, possibly related to geographic and oceanographic influences. Isolation‐by‐distance analyses of each of the two broodlines showed a stronger relationship (x 4·8) among even‐ than odd‐broodline populations. Allele frequency differences between even‐ and odd‐broodlines reflected the reproductive isolation of the broodlines. However, there were no fixed frequency differences which, considered with the differing population structures, suggests that migration‐drift equilibrium has not yet obtained in one or both broodlines. The structural differences also suggest it is likely that the even‐ and odd‐broodlines are of different ages and that one is derived from the other. Allozyme data do not provide a genealogical basis for identifying the ancestral lineage.