Matching Items (93)
Description
Though it is a widespread adaptation in humans and many other animals, parental care comes in a variety of forms and its subtle physiological costs, benefits, and tradeoffs related to offspring are often unknown. Thus, I studied the hydric, respiratory, thermal, and fitness dynamics of maternal egg-brooding behavior in Children's pythons (Antaresia childreni). I demonstrated that tight coiling detrimentally creates a hypoxic developmental environment that is alleviated by periodic postural adjustments. Alternatively, maternal postural adjustments detrimentally elevate rates of egg water loss relative to tight coiling. Despite ventilating postural adjustments, the developmental environment becomes increasingly hypoxic near the end of incubation, which reduces embryonic metabolism. I further demonstrated that brooding-induced hypoxia detrimentally affects offspring size, performance, locomotion, and behavior. Thus, parental care in A. childreni comes at a cost to offspring due to intra-offspring tradeoffs (i.e., those that reflect competing offspring needs, such as water balance and respiration). Next, I showed that, despite being unable to intrinsically produce body heat, A. childreni adjust egg-brooding behavior in response to shifts in nest temperature, which enhances egg temperature (e.g., reduced tight coiling during nest warming facilitated beneficial heat transfer to eggs). Last, I demonstrated that A. childreni adaptively adjust their egg-brooding behaviors due to an interaction between nest temperature and humidity. Specifically, females' behavioral response to nest warming was eliminated during low nest humidity. In combination with other studies, these results show that female pythons sense environmental temperature and humidity and utilize this information at multiple time points (i.e., during gravidity [egg bearing], at oviposition [egg laying], and during egg brooding) to enhance the developmental environment of their offspring. This research demonstrates that maternal behaviors that are simple and subtle, yet easily quantifiable, can balance several critical developmental variables (i.e., thermoregulation, water balance, and respiration).
ContributorsStahlschmidt, Zachary R (Author) / DeNardo, Dale F (Thesis advisor) / Harrison, Jon (Committee member) / McGraw, Kevin (Committee member) / Rutowski, Ronald (Committee member) / Walsberg, Glenn (Committee member) / Arizona State University (Publisher)
Created2011
Description
An ever expanding body of research has shown that children of divorce are at increased risk for a range of maladaptive outcomes including academic failure, behavior problems, poor psychological adjustment, reduced self-concept, and reduced social competence (Amato, 2001). Furthermore, the widespread prevalence of divorce makes preventing these poor outcomes a pressing public health concern. The Children of Divorce-Coping with Divorce (CoD-CoD) program is an internet-based selective prevention that was derived from recent research identifying modifiable protective factors in children of divorce including active and avoidant coping, divorce appraisals, and coping efficacy. CoD-CoD addresses these putative mediators through careful adaptation of intervention components previously demonstrated to be effective for children from disrupted families (Pedro-Carroll & Alpert-Gillis, 1997; Stolberg & Mahler, 1994; Sandler, et al., 2003). In the CoD-CoD efficacy trial, 147 children ages 11-16 whose family had received a divorce decree within 48 months of the intervention start date served as participants. Participants were assessed in two waves in order to test the small theory of the intervention as well as the interventions effects on internalizing and externalizing behaviors. Analyses indicated that the program effectively reduced the participants total mental health problems and emotional problems as reported on the Strengths and Difficulties Questionnaire (SDQ) (d = .37) and for total mental health problems this effect was stronger for children with greater baseline mental health problems (d = .46). The program also had mediated effects on both child and parent-reported total mental health problems whereby the program improved coping efficacy for children with low baseline coping efficacy which led to reduced parent-reported mental health problems. To the author's knowledge this is the first randomized controlled trail of internet-based mental health program for children or adolescents which utilizes an active control condition.
ContributorsBoring, Jesse (Author) / Sandler, Irwin (Thesis advisor) / Crnic, Keith (Committee member) / Tein, Jenn-Yun (Committee member) / Horan, John (Committee member) / Arizona State University (Publisher)
Created2011
Description
Studies of animal contests often focus solely on a single static measurement of fighting ability, such as the size or the strength of the individual. However, recent studies have highlighted the importance of individual variation in the dynamic behaviors used during a fight, such as, assessment strategies, decision making, and fine motor control, as being strong predictors of the outcome of aggression. Here, I combined morphological and behavioral data to discover how these features interact during aggressing interactions in male virile crayfish, Faxonius virilis. I predicted that individual variation in behavioral skill for decision making (i.e., number of strikes thrown), would determine the outcome of contest success in addition to morphological measurements (e.g. body size, relative claw size). To evaluate this prediction, I filmed staged territorial interactions between male F. virilis and later analyzed trial behaviors (e.g. strike, pinches, and bout time) and aggressive outcomes. I found very little support for skill to predict win/loss outcome in trials. Instead, I found that larger crayfish engaged in aggression for longer compared to smaller crayfish, but that larger crayfish did not engage in a greater number of claw strikes or pinches when controlling for encounter duration. Future studies should continue to investigate the role of skill, by using finer-scale techniques such as 3D tracking software, which could track advanced measurements (e.g. speed, angle, and movement efficiency). Such studies would provide a more comprehensive understanding of the relative influence of fighting skill technique on territorial contests.
ContributorsNguyen, Phillip Huy (Author) / Angilletta, Michael (Thesis director) / McGraw, Kevin (Committee member) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
Description
Accumulating evidence implicates exposure to adverse childhood experiences in the development of hypocortisolism in the long-term, and researchers are increasingly examining individual-level mechanisms that may underlie, exacerbate or attenuate this relation among at-risk populations. The current study takes a developmentally and theoretically informed approach to examining episodic childhood stressors, inherent and voluntary self-regulation, and physiological reactivity among a longitudinal sample of youth who experienced parental divorce. Participants were drawn from a larger randomized controlled trial of a preventive intervention for children of divorce between the ages of 9 and 12. The current sample included 159 young adults (mean age = 25.5 years; 53% male; 94% Caucasian) who participated in six waves of data collection, including a 15-year follow-up study. Participants reported on exposure to negative life events (four times over a 9-month period) during childhood, and mothers rated child temperament. Six years later, youth reported on the use of active and avoidant coping strategies, and 15 years later, they participated in a standardized psychosocial stress task and provided salivary cortisol samples prior to and following the task. Path analyses within a structural equation framework revealed that a multiple mediation model best fit the data. It was found that children with better mother-rated self-regulation (i.e. low impulsivity, low negative emotionality, and high attentional focus) exhibited lower total cortisol output 15 years later. In addition, greater self-regulation in childhood predicted greater use of active coping in adolescence, whereas a greater number of negative life events predicted increased use of avoidant coping in adolescence. Finally, a greater number of negative events in childhood predicted marginally lower total cortisol output, and higher levels of active coping in adolescence were associated with greater total cortisol output in young adulthood. Findings suggest that children of divorce who exhibit better self-regulation evidence lower cortisol output during a standardized psychosocial stress task relative to those who have higher impulsivity, lower attentional focus, and/or higher negative emotionality. The conceptual significance of the current findings, including the lack of evidence for hypothesized relations, methodological issues that arose, and issues in need of future research are discussed.
ContributorsHagan, Melissa (Author) / Luecken, Linda (Thesis advisor) / MacKinnon, David (Committee member) / Wolchik, Sharlene (Committee member) / Doane, Leah (Committee member) / Arizona State University (Publisher)
Created2013
Description
Human-induced rapid environmental change (HIREC) influences nearly all of Earth's ecosystems through processes such as urbanization. Previous studies have found that urbanization influences biodiversity patterns, often yielding an increase in the abundance of a few urban-adapted taxa at the expense of native species diversity. The western black widow spider, Latrodectus hesperus, is a medically-important pest species that often forms dense urban subpopulations (i.e., infestations) relative to the low-density subpopulations found throughout undisturbed, desert habitat. Here, I employ field and laboratory studies to examine the population ecology and stoichiometry of this urban pest to increase our understanding of the mechanisms underlying its success. The population ecology of ten black widow subpopulations spread across metropolitan Phoenix, AZ was examined during the peak breeding season (June-August). This study revealed that arthropod prey abundance, female mass and population density of females showed significant spatial variation across the ten subpopulations. Additionally, prey abundance and foraging success, measured as the number of carcasses found in webs, were a strong determinant of female mass and population density within each subpopulation. To test the mechanisms that drive black widow infestations, I used ecological stoichiometry to examine the nutrient (nitrogen and phosphorus) composition of spiders and arthropod prey from urban habitat, desert habitat and a laboratory diet regime. These studies revealed that (1) spiders are more nutrient rich than cricket prey in the field, (2) spider subpopulations exhibit significant spatial variation in their nitrogen composition, (3) nutrient composition of urban spider subpopulations does not differ significantly from Sonoran desert subpopulations, (4) laboratory-reared spiders fed a diet of only laboratory-reared crickets are more nitrogen and phosphorus limited than field-captured spiders, and (5) cannibalism by laboratory-reared spiders alleviated phosphorus limitation, but not nitrogen limitation, when compared to field-captured spiders. This work highlights the need to examine the population ecology of species relationships, such as predator-prey dynamics, to fully understand the fecundity and population growth of urban pest species. Moreover, the integration of population ecology and stoichiometry illustrates the need to address mechanisms like nutrient limitation that may explain why urban pest populations thrive and native species diversity suffers following HIREC.
ContributorsTrubl, Patricia (Author) / Johnson, James C. (Thesis advisor) / Rutowski, Ronald (Thesis advisor) / McGraw, Kevin (Committee member) / Arizona State University (Publisher)
Created2012
Description
Although it has been established that children raised by lesbian and gay (LG) parents are comparable in psychological adjustment to those raised by heterosexuals, there are unique stressors that these families must face as members of a social minority group. For example, chronic exposure to stigma and discrimination has been associated with several poor psychological and behavioral outcomes in children, as well as high levels of stress experienced by LG parents. Thus, the current study sought to examine LG parents' coping actions and parenting strategies as used during and after an act of antigay discrimination which also involved their children, or as these involved an act which their children witnessed. This study also sought to define the parenting needs of LG parents. The research plan utilized an integrative mixed methods approach to examine the qualitative text narratives of 43 LG parents (29 mothers and 14 fathers) ranging in age from 28-56 years old with school-aged children (6-12 years). Results revealed that LG parents' negative emotion-based coping actions predicted higher depressive symptoms (β= .41,t(33) = 3.17, p < .01), LG parents' avoidant/escape coping actions predicted lower parenting self-agency (β = -.34, t(33) = -2.23, p < .05), and LG parents' engagement in understanding and coping with discrimination parenting strategies predicted lower post-traumatic stress problems in their children (β = -.33, t(33) = -1.96, yp = .059). Last, a family needs assessment survey was used to determine the unique parenting needs of these LG parents. The results of this survey indicated that LG parents endorsed the following three topic areas as most important to them: (a) LG Family Community Services, (b) Information about Child Development, and (c) Explaining LG Family to Others. These findings reinforce existing knowledge in terms of the effects of discrimination on LG parents and their children. Indeed, results indicate the importance of providing LG parents with adaptive discrimination coping and parenting strategies, as well as offering valuable information concerning their specific needs.
ContributorsKellison, Joshua G (Author) / Gonzalez Castro, Felipe (Thesis advisor) / Crnic, Keith (Thesis advisor) / Barrera, Jr., Manuel (Committee member) / Marsiglia, Flavio (Committee member) / Wolchik, Sharlene (Committee member) / Arizona State University (Publisher)
Created2014
Description
In order to analyze data from an instrument administered at multiple time points it is a common practice to form composites of the items at each wave and to fit a longitudinal model to the composites. The advantage of using composites of items is that smaller sample sizes are required in contrast to second order models that include the measurement and the structural relationships among the variables. However, the use of composites assumes that longitudinal measurement invariance holds; that is, it is assumed that that the relationships among the items and the latent variables remain constant over time. Previous studies conducted on latent growth models (LGM) have shown that when longitudinal metric invariance is violated, the parameter estimates are biased and that mistaken conclusions about growth can be made. The purpose of the current study was to examine the impact of non-invariant loadings and non-invariant intercepts on two longitudinal models: the LGM and the autoregressive quasi-simplex model (AR quasi-simplex). A second purpose was to determine if there are conditions in which researchers can reach adequate conclusions about stability and growth even in the presence of violations of invariance. A Monte Carlo simulation study was conducted to achieve the purposes. The method consisted of generating items under a linear curve of factors model (COFM) or under the AR quasi-simplex. Composites of the items were formed at each time point and analyzed with a linear LGM or an AR quasi-simplex model. The results showed that AR quasi-simplex model yielded biased path coefficients only in the conditions with large violations of invariance. The fit of the AR quasi-simplex was not affected by violations of invariance. In general, the growth parameter estimates of the LGM were biased under violations of invariance. Further, in the presence of non-invariant loadings the rejection rates of the hypothesis of linear growth increased as the proportion of non-invariant items and as the magnitude of violations of invariance increased. A discussion of the results and limitations of the study are provided as well as general recommendations.
ContributorsOlivera-Aguilar, Margarita (Author) / Millsap, Roger E. (Thesis advisor) / Levy, Roy (Committee member) / MacKinnon, David (Committee member) / West, Stephen G. (Committee member) / Arizona State University (Publisher)
Created2013
Description
Despite the compelling nature of goodness of fit and widespread recognition of the concept, empirical support has lagged, potentially due to complexities inherent in measuring such a complicated, relational construct. The present study examined two approaches to measuring goodness of fit in mother-child dyads and prospectively explored associations to mother-child relationship quality, child behavior problems, and parenting stress across the preschool period. In addition, as goodness of fit might be particularly important for children with developmental delays, child developmental risk status was considered as a moderator of goodness of fit processes. Children with (n = 110) and without (n = 137) developmental delays and their mothers were coded while interacting during a number of lab tasks at child age 36 months and during naturalistic home observations at child age 48 months. Mothers and father completed questionnaires at child ages 36 and 60 months assessing child temperamental characteristics, child behavior problems, and parenting stress. Results highlight child-directed effects on mother-child goodness of fit processes across the early child developmental period. Although there was some evidence that mother-child goodness of fit was associated with parenting stress 2 years later, goodness of fit remains an elusive concept. More precise models and expanded developmental perspectives are needed in order to fully capture the transactional and dynamic nature of goodness of fit in the parent-child relationship.
ContributorsNewland, Rebecca Pauline (Author) / Crnic, Keith (Thesis advisor) / Bradley, Robert (Committee member) / Jahromi, Laudan (Committee member) / Millsap, Roger (Committee member) / Arizona State University (Publisher)
Created2014
Description
Research shows that general parenting practices (e.g., support and discipline), influence adolescent substance use. However, socialization theory suggests that parental socialization occurs not only through general parenting practices, but also through parents' attempts to influence specific behaviors and values. A growing literature supports links between substance-specific parenting and adolescent substance use. For adolescent alcohol use, there are considerable limitations and gaps within this literature. To address these limitations, the present study examined the factor structure of alcohol-specific parenting, investigated the determinants of alcohol-specific parenting, and explored its association with nondrinking adolescents' attitudes about alcohol use. Using a high-risk sample of nondrinking adolescents and their parents, the current study found three dimensions of alcohol-specific parenting using both adolescent and parent reports, but also found evidence of non-invariance across reporters. Results also revealed complex roles of parental alcohol use disorder (AUD; including recovered and current AUD), family history of AUD, and current drinking as determinants of the three dimensions of anti-alcohol parenting behaviors. Moreover, the current study showed that the effects of these determinants varied by the reporter of the parenting behavior. Finally, the current study found the dimensions of alcohol-specific parenting to be unique and significant predictors of nondrinking adolescents' attitudes about alcohol, over and above general parenting practices, parent AUD, and parent current drinking. Given its demonstrated distinctness from general parenting practices, its link with adolescent alcohol attitudes, and its potential malleability, alcohol-specific parenting may be an important complement to interventions targeting parents of adolescents.
ContributorsHandley, Elizabeth D (Author) / Chassin, Laurie (Thesis advisor) / MacKinnon, David (Committee member) / Crnic, Keith (Committee member) / Sandler, Irwin (Committee member) / Arizona State University (Publisher)
Created2012
Description
Using a sample of children from divorced homes, the current study assesses the effects of family relationship variables on romantic outcomes in young adulthood, through the influence of several individual-level variables. In particular, children's coping efficacy and peer competence are examined as mediators of the effects of parenting and interparental conflict on children's later romantic involvement and relationship quality. Assessments occurred during childhood, when children were between the ages of nine and 12, in adolescence, when children were ages 15 to 18, and in young adulthood, when children were ages 24 to 27, spanning a period of 15 years. Childhood and adolescent variables were measured using child- and mother-report data and young adult measures were completed by the young adults and their romantic partners. One model was tested using all participants in the sample, regardless of whether they were romantically involved in young adulthood, and revealed that maternal warmth in childhood was linked with children's coping efficacy six years later, which was marginally related to an increased likelihood of being romantically involved and to decreased romantic attachment at the 15-year follow-up. A model with only the participants who were romantically involved in young adulthood also revealed a link between childhood maternal warmth and coping efficacy in adolescence, which was then marginally related to increased romantic satisfaction and to confidence in the romantic relationship in young adulthood. Marginal mediation was also found for several of the proposed paths, and there was little evidence to support path differences between males and females. Implications of the present findings for research with children from divorced families and the development of preventive interventions are discussed. In particular, parenting, interparental conflict, peer competence, and coping efficacy are examined as modifiable targets for change and existing preventive interventions employing these targets are described.
ContributorsSigal, Amanda (Author) / Sandler, Irwin N. (Thesis advisor) / Millsap, Roger (Committee member) / Crnic, Keith (Committee member) / Lemery, Kathryn (Committee member) / Arizona State University (Publisher)
Created2012