Columbia River White Sturgeon (Acipenser Transmontanus) Population Genetics and Early Life History Study PDF Download
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Author:
Publisher:
ISBN:
Category : Sturgeon fisheries
Languages : en
Pages : 42
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Author:
Publisher:
ISBN:
Category : Sturgeon fisheries
Languages : en
Pages : 42
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
The 1986 Columbia River white sturgeon investigations continued to assess genetic variability of sturgeon populations isolated in various areas of the Columbia River, and to examine environmental factors in the habitat that may affect early life history success. Baseline data have been collected for three character sets. Twenty-eight loci have been analyzed for differences using electrophoresis, snout shapes were assessed for multivariate distinction, and scute counts have been examined as an index of variability. Fish that reside in the mid-Columbia and lower river have been sufficiently characterized by electrophoresis to compare with up-river areas. To date, few electrophoretic differences have been identified. However, Lake Roosevelt sturgeon sample size will be increased to determine if some of the observed differences from lower river fish are significant. Snout shape has been shown to be easily quantifiable using the digitizing technique. Scute count data initially indicate that variability exists within as well as between areas. Patterns of differentiation of one or more of these data sets may be used to formulate stock transplant guidelines essential for proper management or enhancement of this species. The historical habitat available to sturgeon in the Columbia River has changed through the development of hydroelectric projects. Dams have reduced the velocity and turbulence, and increased light penetration in the water column from less silt. These changes have affected the ability of sturgeon to feed and have made them more vulnerable to predation, which appear to have altered the ability of populations isolated in the reservoirs to sustain themselves. Present studies support the theory that both the biological and physical habitat characteristics of the Columbia River are responsible for reduced sturgeon survival, and justify consideration of enhancement initiatives above Bonneville to improve sturgeon reproductive success.
Author:
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Category : Power resources
Languages : en
Pages : 872
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Author: United States. Congress. Senate. Committee on Appropriations. Subcommittee on Energy and Water Development
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ISBN:
Category : Nature
Languages : en
Pages : 568
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Author: E. L. Brannon
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Category : Sturgeon fisheries
Languages : en
Pages : 0
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Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 612
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Author:
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ISBN:
Category : Engineering
Languages : en
Pages : 472
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Author:
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ISBN:
Category :
Languages : en
Pages : 77
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Research on Columbia River white sturgeon has been directed at their early life history as it may apply to production and enhancement strategies for management of the species. The river environment in which sturgeon historically migrated, spawned, and reared has changed through development. Habitat changes are expected to precipitate genetic changes in the fish, as well as reduce the fitness in populations. Genetic analysis of samples taken from various locations over the length of the Columbia River have indicated that observed gene frequencies in all areas sampled were not in Hardy-Weinburg equilibrium, which could suggest that the general population is experiencing perturbation in the system. Analysis thus far has exposed few differences between samples from the lower, middle, and upper portions of the system. Allelic differences were identified in fish from the Roosevelt Lake, which may be evidence of unique characteristics among fish from that general area.
Author:
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ISBN:
Category : Fish culture
Languages : en
Pages : 352
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Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 968
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