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Population structure, introgression,...

Chen, Yongjiu.

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Population structure, introgression, taxonomy, and conservation of endangered tui chubs.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Population structure, introgression, taxonomy, and conservation of endangered tui chubs./
作者:	Chen, Yongjiu.
面頁冊數:	98 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 1786.
Contained By:	Dissertation Abstracts International67-04B.
標題:	Agriculture, Fisheries and Aquaculture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3212842
ISBN:	9780542632044

Population structure, introgression, taxonomy, and conservation of endangered tui chubs.
Chen, Yongjiu.

Population structure, introgression, taxonomy, and conservation of endangered tui chubs. - 98 p.

Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 1786.

Thesis (Ph.D.)--University of California, Davis, 2006.

Using microsatellite DNA loci, this study characterized the genetic and population structure, and addressed the conservation of endangered tui chub (Siphateles bicolor) populations in the Owens River (S. b. snyderi), Cowhead Lake (S. b. vaccaceps), and Mojave River Basin (S. b. mohavensis). First, our study confirmed that tui chubs in the Owens River and its tributaries, and Mono Lake tributaries comprised a hybrid swarm of Owens X Lahontan tui chubs. The overall degree of introgression between Lahontan and Owens tui chubs was approximately 40%, and the remaining 60% derived from Owens' original genetic composition. Unexpectedly, Owens tui chubs were more genetically similar to Lahontan tui chubs than to Cabin Bar tui chubs, although they shared the same river basin with the latter. We gave the Cabin Bar tui chub a common name "toikona tui chub" to distinguish it from the Owens. Both Owens and toikona tui chubs merit independent protection and recovery efforts. Management practices should prevent any future genetic mixing of non-introgressed Owens, toikona, or Lahontan tui chubs with each other, or with the hybrid swarm.

ISBN: 9780542632044Subjects--Topical Terms:

1020913
Agriculture, Fisheries and Aquaculture.

Population structure, introgression, taxonomy, and conservation of endangered tui chubs.
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500 $a Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 1786.
502 $a Thesis (Ph.D.)--University of California, Davis, 2006.
520 $a Using microsatellite DNA loci, this study characterized the genetic and population structure, and addressed the conservation of endangered tui chub (Siphateles bicolor) populations in the Owens River (S. b. snyderi), Cowhead Lake (S. b. vaccaceps), and Mojave River Basin (S. b. mohavensis). First, our study confirmed that tui chubs in the Owens River and its tributaries, and Mono Lake tributaries comprised a hybrid swarm of Owens X Lahontan tui chubs. The overall degree of introgression between Lahontan and Owens tui chubs was approximately 40%, and the remaining 60% derived from Owens' original genetic composition. Unexpectedly, Owens tui chubs were more genetically similar to Lahontan tui chubs than to Cabin Bar tui chubs, although they shared the same river basin with the latter. We gave the Cabin Bar tui chub a common name "toikona tui chub" to distinguish it from the Owens. Both Owens and toikona tui chubs merit independent protection and recovery efforts. Management practices should prevent any future genetic mixing of non-introgressed Owens, toikona, or Lahontan tui chubs with each other, or with the hybrid swarm.
520 $a Second, we found extensive genetic variation among tui chub populations in the Cowhead and surrounding basins. Our data supported the distinctiveness of the Cowhead Lake tui chub from tui chubs in neighboring basins, including the Warner Basin into which Cowhead Lake drained. Tui chubs from the Warner Valley, Goose Lake, and Pit River were closely related, as well as tui chubs from the Catlow and Guano Basins. Summer Lake and Lake Abert tui chubs appeared distinct, both from each other and from tui chubs in the other basins. Our findings suggested unidirectional dispersal from the Cowhead to Warner Lake, and bidirectional inter-basin gene flow among Warner, Goose and Summer Lakes. The Cowhead tui chub population contained levels of genetic diversity similar to other stream-dwelling populations, but lower than large lake-dwelling populations, such as those in the geographically proximate Warner and Goose Lakes.
520 $a Finally, our study found only unhybridized Arroyo chubs in the Mojave River, and unhybridized Mohave tui chubs in the refugial populations. Population substructure was evident among the four Mohave tui chub populations. Contrary to our expectation, the source population at Mohave Chub (MC) Spring had significantly fewer alleles and lower heterozygosity than populations historically derived from it. Genetic drift due to a small effective population size in MC Spring had reduced genetic diversity in the five decades since the original transplants were made. A bottleneck of 10 individuals during the founding of the Camp Cady population was reflected in significantly lower genetic diversity and divergence of that population from all others. Two additional refuges possessed significantly higher levels of diversity, Lake Tuendae and China Lake. We recommend instituting artificial gene flow to rebuild genetic diversity in MC Spring and Camp Cady, and to better conserve allelic diversity in the species as a whole.
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