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    Spatio-temporal population genetic structure and mating system of red king crab (Paralithodes camtschaticus) in Alaska

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    Author
    Vulstek, Scott C.
    Chair
    Tallmon, David
    Committee
    Eckert, Ginny
    Gharrett, Anthony
    Keyword
    Alaskan king crab
    Genetics
    Reproduction
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/12696
    Abstract
    Population genetic data can be used to make inferences about the Population structure and mating system and inform management decisions of overharvested species such as red king crab (Paralithodes camtschaticus) in Alaska. Red king crab tissue and hemolymph samples were collected from 11 geographically distinct locations from Norton Sound through Southeast Alaska (n = 845). At six locations, two collections were taken at least one generation apart. Heterogeneity of allele frequencies over time was detected in three of the six locations examined, which suggested signs of recent population bottlenecks. An overall Fst = 0.025 (P <0.00 1) suggested moderate genetic differentiation among red king crab collections. A two-region model of spatial differentiation in which collections from Southeast Alaska diverge from those in the Gulf of Alaska and Westen Alaska was supported by pairwise Fst Values, homogeneity tests, Bayesian clustering, and discriminant analysis of principal components. However, spatial analysis of molecular variance suggests some finer-scale structuring within regions and greater differentiation occurs among collections within Southeast Alaska than among the rest of the collections. In addition to population genetic structure analyses, 24 female red king crab and their broods were collected from the Bering Sea. Ovigerous females and 20 offspring per brood were genotyped in order to determine whether multiple mating of a female occurred. There was no evidence of multiple paternity in any brood. The results of this study support continued management of distinct geographic groups within the Gulf of Alaska/Western Alaska/Western Alaska region and suggest that finer-scale management may be beneficial in Southeast Alaska.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2011
    Table of Contents
    Introduction -- History of the fishery -- Population genetic structure -- Mating system -- Objectives -- Materials and methods -- Sample collection -- Microsatellite analysis -- Genetic diversity and population genetic structure -- Effective population size and population bottlenecks -- Mating system -- Results -- Genetic diversity -- Temporal population structure -- Spatial population structure -- Effective population size and population bottlenecks -- Mating system -- Discussion -- Genetic diversity and population structure -- Mating system -- General conclusions and management recommendations -- References -- Appendix.
    Date
    2011-12
    Type
    Thesis
    Collections
    Fisheries

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