Genetic Monitoring and Evaluation Program for Supplemented Populations of Salmon and Steelhead in the Snake River Basin, 1990-1991 Annual Report PDF Download
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Category :
Languages : en
Pages : 55
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This is the first report of research for an ongoing study to evaluate the genetic effects of using hatchery-reared fish to supplement natural populations of chinook salmon and steelhead in the Snake River Basin.
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Category :
Languages : en
Pages : 55
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This is the first report of research for an ongoing study to evaluate the genetic effects of using hatchery-reared fish to supplement natural populations of chinook salmon and steelhead in the Snake River Basin.
Author: Robin S. Waples
Publisher:
ISBN:
Category : Salmonidae
Languages : en
Pages : 50
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Author:
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ISBN:
Category :
Languages : en
Pages : 157
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This is the second report of research for an ongoing study to evaluate the genetic effects of using hatchery-reared fish to supplement natural populations of chinook salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss) in the Snake River Basin. The study plan involves yearly monitoring of genetic and meristic characteristics in hatchery, natural (supplemented), and wild (unsupplemented) populations in four different drainages for each species. This report summarizes the first two years of electrophoretic data for chinook salmon and steelhead and the first two years of meristic data for chinook salmon. Results obtained to date include the following: (1) Genetic variation was detected at 35 gene loci in chinook salmon and 50 gene loci in steelhead, both considerable increases over the number of polymorphic loci reported previously for Snake River populations. No substantial differences in levels of genetic variability were observed between years or between hatchery and natural/wild populations in either species. (2) In both species, statistically significant differences in allele frequency were typically found between years within populations. However, the temporal changes within populations were generally smaller than differences between populations. (3) Differences between chinook salmon populations classified as spring-and summer-run accounted for little of the overall genetic diversity; in contrast, substantial genetic differences were observed between ''B'' run steelhead from Dworshak Hatchery and ''A'' run populations from other study sites. (4) Estimates of the effective number of breeders per year (N,) derived from genetic data suggest that N{sub b} in natural and wild Snake River spring/summer chinook salmon populations is generally about one-quarter to three-quarters of the estimated number of adult spawners. (5) Analysis of the effects on data quality of sampling juveniles indicates that the small size of some wild fish may lead to a slight increase in the number of missing datapoints; however, there is no evidence for bias in the data that are collected. (6) Seven bilateral meristic characters in chinook salmon were identified that show promise as indicators of fluctuating asymmetry. Indices of asymmetry varied in a largely random fashion among populations. No correlation was found between the level of asymmetry and the level of genetic variability within individual fish.
Author: Robin S. Waples
Publisher:
ISBN:
Category : Fishery resources
Languages : en
Pages : 179
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Author:
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ISBN:
Category :
Languages : en
Pages : 8
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This progress report offers a summary of genetic monitoring and evaluation research related to artificial propagation of Chinook salmon and steelhead in the Snake River basin. Our principal goal has been to characterize the relative (and net) reproductive success of hatchery fish spawning in the wild in multiple sub-basins. We address a critical uncertainty identified in essentially all tribal, state, and federal recovery planning efforts. Beyond simple description of those patterns of differential reproductive success, we seek to understand the biotic and abiotic factors that contribute to our observations, including genetic and environmental elements, and the real time effects of hatchery reform. We adopt two fundamentally different approaches that capture processes operating at different geographic scales. Our tier 2 design monitors changes in gene frequency through time in hatchery and wild populations. These studies monitor spatial and temporal genetic change over broad river basins and sub-basins. Tier 3 studies, by contrast, are able to construct pedigrees in naturally spawning populations that include hatchery and wild fish. We can then use actual matings to infer the fitness of hatchery versus wild individuals, based on the numbers of offspring we observe in our progeny samples. We get extraordinary detail from the tier 3 studies but only for a single river system. Thus, tier 2 studies provide breadth of information, whereas tier 3 studies offer unparalleled depth of insight for single discrete systems. We exceeded our goals in almost all areas for both tier 2 and tier 3 studies, and, where we did not, we offer an explanation of why, and what future action will be taken (Lessons Learned). All subcontracts were let as expected, providing smolt trapping, tissue sampling, genotyping, and analysis. Our inter-laboratory standardization efforts with tribal, state, and federal agencies were highly successful in this period. These standardization activities have been an on-going element of this study, beginning with WDFW's forays into DNA markers in the late 1990s and continuing and becoming more formalized with the initiation of the newer genetics laboratories (CRITFC, USFWS, and IDFG). This report is intended to document success in achieving collection and genotyping goals. Data analyses, presentation, and publication are keeping pace with data collection; however, detailed results are not presented at this time. A complete and comprehensive analysis and description of results will be provided in published manuscripts and in the 2009 annual report (the culmination of the current 3-year rolling review cycle). In the first section of this report, we present accomplishments related to individual projects within this genetic monitoring program. Subsequent to the standard reporting categories, we provide a Specific Obligations section that lists accomplishments exactly as the deliverables are presented in the Pisces Statement of Work. This approach results in a small amount of redundancy, but we try to minimize obvious cases. The goal is to provide our accomplishments in a format that is easily compared to the Work-Element-driven format of Pisces, yet also provide a narrative that shows continuity with the individual studies that make up this research program.
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 654
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Author: Steven R. Beissinger
Publisher: University of Chicago Press
ISBN: 9780226041773
Category : Nature
Languages : en
Pages : 616
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Many of the world's leading conservation and population biologists evaluate what has become a key tool in estimating extinction risk and evaluating potential recovery strategies - population viability analysis, or PVA.
Author: United States. National Marine Fisheries Service
Publisher:
ISBN:
Category : Endangered species
Languages : en
Pages : 1030
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Author: Andrew P. Hendry
Publisher: Oxford University Press, USA
ISBN: 019514385X
Category : Nature
Languages : en
Pages : 521
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This work gives a critical overview on the evolution and population biology of salmon and their relatives. It should appeal to investigators in each of the scientific disciplines it integrates - evolutionary biology, ecology, salmonid biology, management and conservation. Variation in salmonids can be used to illustrate virtually all evolution.
Author: United States. Congress. Senate. Committee on Appropriations. Subcommittee on Energy and Water Development
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 568
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