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.
Responses to affective stimuli: A study of children from violent homesMcCloskey, Laura A.; Becker, Kimberly Barletto (The University of Arizona., 2001)This study examined youths' (mean age = 16) responses to videotaped scenes depicting various family exchanges as a function of their exposure to family violence during childhood. Children exposed to family violence (n = 92) and a comparison group of children (n = 31) demographically similar to those in the index group described their family backgrounds and domestic violence experiences during interviews in 1990-91, when the children were between the ages of 6 and 12. Approximately eight years later, these participants viewed film clips depicting family members engaged in hostile, prosocial, and neutral exchanges while a computer monitored their skin conductance responses. Youths also provided self-reports of their emotions and arousal after watching these scenes. Analyses of self-reported emotions failed to yield differences based on family violence background. Analyses of skin conductance responses, however, indicated that males and females exposed to family violence during childhood responded to the films in divergent ways, and these responses usually differed from those of youths in the comparison group. Specifically, males from originally violent homes displayed physiological overarousal, whereas females evinced physiological underarousal. These findings provide evidence for the potentially long-term effects of family violence as well as sex differences in responding to family violence. Results are discussed in light of the literature on the sensitization effects of family conflict.
Persuading clients to engage in treatment: The effect of using one-sided and two-sided information on the likelihood of treatment attendanceShoham, Varda; Becker, Susan Elizabeth, 1961- (The University of Arizona., 1997)Two studies were conducted to examine the role that information plays on persuading participants to engage in psychotherapy. Study 1 examined the effect of commitment to treatment on the seeking of information about the treatment by psychotherapy clients. This study demonstrated that participants have a preference for seeking positive information about treatment, particularly those who are postdecisional about change. Study 2 presented undergraduate participants with either positive information (one-sided) or combined positive and negative information (two-sided) about treatment. An interaction effect was found such that participants who were contemplating change were more likely to attend treatment after hearing two-sided information than one-sided. Participants who were ready to take action were more likely to attend when they heard one-sided information than when they heard two-sided information. These findings are discussed in terms of their implications for the presentation of information in psychotherapy informed consent procedures.