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Conservation Genetics of Paddlefish:...

Asher, Allison Marie.

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Conservation Genetics of Paddlefish: Genetic Effective Population Size and Rangewide Genetic Structure.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Conservation Genetics of Paddlefish: Genetic Effective Population Size and Rangewide Genetic Structure./
作者:	Asher, Allison Marie.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	98 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
Contained By:	Dissertations Abstracts International81-02B.
標題:	Conservation biology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13815069
ISBN:	9781085565165

Conservation Genetics of Paddlefish: Genetic Effective Population Size and Rangewide Genetic Structure.
Asher, Allison Marie.

Conservation Genetics of Paddlefish: Genetic Effective Population Size and Rangewide Genetic Structure. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 98 p.

Source: Dissertations Abstracts International, Volume: 81-02, Section: B.

Thesis (Ph.D.)--Southern Illinois University at Carbondale, 2019.

This item must not be sold to any third party vendors.

Paddlefish (Polyodon spathula) is a commercially and recreationally important species, with a native range that extends over 22 US states. This is a large, long-lived, highly mobile riverine species that has been negatively impacted by habitat fragmentation, historic overharvest, and hatchery supplementation. Dams are the primary cause of habitat fragmentation, blocking migration routes, flooding spawning grounds, and isolating populations. A common management action to mitigate the impacts of habitat fragmentation and maintain harvestable populations is hatchery propagation and stocking. Reduction in stock size, isolation of populations, and stocking can all negatively impact the genetic integrity of Paddlefish. I evaluated the impacts of isolation and hatchery supplementation on the effective population size (Ne) of Paddlefish as well as the range-wide genetic structure of Paddlefish.Low effective population sizes (Ne) can be detrimental to wild populations resulting in increased risk of inbreeding and loss of adaptive variation. Habitat fragmentation and population supplementation are two factors that can lead to an erosion of genetic variation within populations as measured by a reduction in Ne. I estimated Ne for Paddlefish to understand how management practices coupled with natural and anthropogenic isolation can alter Ne in managed fishery populations in the central United States. I compared Ne among five riverine reservoirs, one free-flowing riverine location, and two isolated Gulf Coast drainages. I genotyped a total of 500 individuals at 11 microsatellite loci and used the linkage disequilibrium method for Ne in the program LDNE. Estimates of Ne for two reservoirs were 29 and 32. Two other reservoirs and the isolated Gulf Coast drainages had Ne estimates above 50 but below 500. Various factors contributed to the low Ne values observed, including isolation, stocking, and population bottlenecks.Isolation due to dams and declining stock size can alter natural patterns of gene flow. To investigate rangewide genetic structure, I sequenced the complete D-loop region of 576 Paddlefish from 18 sampling locations throughout the range of Paddlefish. In total, 50 unique haplotypes were observed, with 3 to 15 haplotypes per location. I found significant genetic heterogeneity among locations, with the majority of pairwise comparisons (124 of 171) significant at α = 0.05 and 40% significant after a Bonferroni correction (α = 0.0003). Two locations of the Arkansas River (Ozark Pool (AR) and Grand Lake (OK)) were highly differentiated from one another and from all other locations. Additionally, all pairwise comparisons with the Ohio River drainage (Ohio River, WV, Ohio River, KY, and Tennessee River, TN) were significant with the exception of two isolated gulf coast drainages, Bayou Nezpique (Louisiana) and the Pascagoula River (Mississippi). Comparisons of the Missouri River, the Mississippi River, and the Red River were not significant, indicating gene flow over large distances. Moreover, the Mantel test for isolation by distance was not significant (r = 0.068, P = 0.268). The significant heterogeneity but lack of phylogeographic patterns of genetic structure in Paddlefish indicate historical connectivity and recent isolation by dams, which isolate populations and increase genetic drift among populations. Anthropogenic threats are not unique to Paddlefish. Investigations such as these can reveal historical patterns of gene flow and the impacts of anthropogenic alterations of natural systems on freshwater species. These results can guide management actions to conserve natural patterns of gene flow and diversity.

ISBN: 9781085565165Subjects--Topical Terms:

535736
Conservation biology.
Subjects--Index Terms:

Effective population size

Conservation Genetics of Paddlefish: Genetic Effective Population Size and Rangewide Genetic Structure.
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