An ecological analysis of the quality fishery for rainbow trout in Becker Lake
KeywordsFishery management -- Arizona -- Becker Lake.
Fisheries -- Research -- Arizona -- Becker Lake.
Trout fisheries -- Arizona -- Becker Lake.
Becker Lake (Ariz.)
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Degree ProgramRenewable Natural Resources
Degree GrantorUniversity of Arizona
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Evolution of Hominin Polyunsaturated Fatty Acid Metabolism: From Africa to the New WorldHarris, Daniel N; Ruczinski, Ingo; Yanek, Lisa R; Becker, Lewis C; Becker, Diane M; Guio, Heinner; Cui, Tao; Chilton, Floyd H; Mathias, Rasika A; O'Connor, Timothy D; et al. (OXFORD UNIV PRESS, 2019-04-03)The metabolic conversion of dietary omega-3 and omega-6 18 carbon (18C) to long chain (>20 carbon) polyunsaturated fatty acids (LC-PUFAs) is vital for human life. The rate-limiting steps of this process are catalyzed by fatty acid desaturase (FADS) 1 and 2. Therefore, understanding the evolutionary history of the FADS genes is essential to our understanding of hominin evolution. The FADS genes have two haplogroups, ancestral and derived, with the derived haplogroup being associated with more efficient LC-PUFA biosynthesis than the ancestral haplogroup. In addition, there is a complex global distribution of these haplogroups that is suggestive of Neanderthal introgression. We confirm that Native American ancestry is nearly fixed for the ancestral haplogroup, and replicate a positive selection signal in Native Americans. This positive selection potentially continued after the founding of the Americas, although simulations suggest that the timing is dependent on the allele frequency of the ancestral Beringian population. We also find that the Neanderthal FADS haplotype is more closely related to the derived haplogroup and the Denisovan clusters closer to the ancestral haplogroup. Furthermore, the derived haplogroup has a time to the most recent common ancestor of 688,474years before present. These results support an ancient polymorphism, as opposed to Neanderthal introgression, forming in the FADS region during the Pleistocene with possibly differential selection pressures on both haplogroups. The near fixation of the ancestral haplogroup in Native American ancestry calls for future studies to explore the potential health risk of associated low LC-PUFA levels in these populations.
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