Genetic Population Structure of Pacific Hake, Merluccius productus, in the Pacific Northwest

This study presents the first protein electrophoretic study of population structure within the Georgia Basin Pacific hake Distinct Population Segment, as defined under the U.S. Endangered Species Act. Forty-one allozyme loci (29 polymorphic) were analyzed in samples from three Pacific hake spawning...

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Bibliographic Details
Published in:Environmental biology of fishes 2004-03, Vol.69 (1-4), p.187-199
Main Authors: Iwamoto, Eric, d, Michael J, Gustafson, Richard G
Format: Article
Language:English
Subjects:
Endangered & extinct species
Endangered species
Genetic diversity
Marine
Merluccius productus
Population structure
Population studies
Spawning
Spawning populations
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Summary:This study presents the first protein electrophoretic study of population structure within the Georgia Basin Pacific hake Distinct Population Segment, as defined under the U.S. Endangered Species Act. Forty-one allozyme loci (29 polymorphic) were analyzed in samples from three Pacific hake spawning populations on the west coast of North America: (1) Port Susan, Puget Sound, Washington (three temporal samples); (2) south-central Strait of Georgia, British Columbia, Canada (two temporal samples); and (3) offshore of southern California (two temporal samples) (total n = 664). Mean heterozygosity over all loci was 12-13% for all populations. Within-population temporal samples were not significantly different from one another, but statistically significant differences were detected at 15 of the 29 polymorphic loci (p < 0.05) among the three populations. Differences at eight of these loci were highly significant (p < 0.001): ADA super(*), ALAT super(*), bGALA super(*), GPI-A super(*), sIDHP super(*), LDH-A super(*), MPI super(*), and PEP-B super(*). The two Georgia Basin populations were significantly different at six loci: bGALA super(*), sIDHP super(*), LDH-A super(*), MPI super(*), PGK super(*), and PGM-2 super(*) (p < 0.05). Nei's genetic distance (D) was 0.0006 between Port Susan and Strait of Georgia pooled temporal samples, and 0.005 between these populations and offshore Pacific hake. F sub(ST) was 0.02 and 0.0046 among all three populations and among the Georgia Basin populations, respectively. Both F sub(ST) estimates were significantly greater than zero, and the results suggest a high degree of demographic isolation among all three populations.
ISSN:0378-1909
1573-5133
DOI:10.1023/B:EBFI.0000022895.10683.c5