Polyploid microsatellite data reveal stock complexity among estuarine North American green sturgeon (Acipenser medirostris)

North American green sturgeon ( Acipenser medirostris ) display the distinctive behavior of long ocean migrations along the west coast punctuated by summer residence in estuaries;; however, little is known about stock composition in these tidal environments. Pairwise comparisons and genetic clusteri...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2009-09, Vol.66 (9), p.1491-1504
Main Authors: Israel, Joshua A, Bando, K. Jun, Anderson, Eric C, May, Bernie
Format: Article
Language:English
Subjects:
Acipenser medirostris
Animal and plant ecology
Animal, plant and microbial ecology
Applied ecology
Behavior
Biological and medical sciences
Brackish
Brackish water ecosystems
Cluster analysis
Comparative analysis
Ecological genetics
Estuaries
Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.)
Fish migration
Fishery management
Fishes
Fundamental and applied biological sciences. Psychology
Genetics
Genotype & phenotype
Harbors
Marine
Methods
Migration
Polyploidy
Sturgeon
Sturgeons
Synecology
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Summary:North American green sturgeon ( Acipenser medirostris ) display the distinctive behavior of long ocean migrations along the west coast punctuated by summer residence in estuaries;; however, little is known about stock composition in these tidal environments. Pairwise comparisons and genetic clustering analysis were used to characterize the two green sturgeon Distinct Population Segments (DPSs) from 20 collections using eight tetrasomic and two disomic microsatellite loci. The observed pattern of green sturgeon DPS composition among five estuaries in California, Oregon, and Washington was supported with assignment testing approaches utilizing the same genotypic data in codominant polysomic and pseudodominant allele phenotype formats. The majority of individuals in northern DPS estuaries originated from the threatened Southern DPS, except in Winchester Bay and Grays Harbor. We detected few Northern DPS green sturgeon in San Pablo Bay, the principal Southern DPS estuary, supporting that green sturgeon preferentially disperse north once they enter their coastal migration. Our genetic findings suggest that stock complexity in green sturgeon is pervasive and support precautionary, interjurisdictional approaches for managing green sturgeon beyond rigid, regulatory boundaries.
ISSN:0706-652X
1205-7533
DOI:10.1139/F09-091