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Dominance hierarchies are generally established based on the levels of aggressiveness that animals present. Frequently, animals fight to establish a dominance hierarchy and obtain a disputed resource. The Mexican mojarra Cichlasoma istlanum is a native species of the Balsas river basin and coexists there with four nonnative cichlids: tilapia Oreochromis sp., convict cichlid Amatitlania nigrofasciata, spotcheek cichlid Thorichthys maculipinnis, and green terror Andinoacara rivulatus. These five cichlid species compete for spaces for reproduction, feeding, and shelter and frequently engage in aggressive interactions to obtain these resources. We quantified dominance indices to evaluate the hierarchical structure of dominance among these five cichlids and the duration of aggressive behaviors of the Mexican mojarra during experimental contests between the native species and each of the four nonnative species. The Mexican mojarra was consistently dominant over the other four cichlid species, performing a larger number of aggressive behaviors and investing more time in attacking than the nonnative cichlids, which resulted in a higher hierarchical position. Our results show that the native fish, Mexican mojarra, established dominance over all four nonnative cichlid fish of the Balsas basin. Thus, the establishment of nonnative cichlid species in the Balsas basin is likely associated with factors other than behavioral dominance. 相似文献
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ABSTRACT We explore the applicability of General Strain Theory to juvenile substance use. In doing so, we offer three advances over prior work. First, we put forward the concept of “problem substance use” to move beyond frequency-based and more medicalized conceptions of the phenomenon toward a conceptualization that views substance use as problematic when it disrupts social relationships and expectations and when it reflects a loss of self-control. Second, we employ a dataset that permits us to explore how strains originating in different life domains influence problem substance use as well as how negative emotions and personal coping resources mediate the relationship between strain and problem substance use. Third, we move beyond prior work by comparing how strain and strain mediators operate differently in schools, alternative learning centers, and juvenile correctional facilities. We find strong effects of the strain variables and strain mediators indicated by General Strain Theory and evidence that alternative learning centers and juvenile correction facilities are associated with especially high odds of problem substance use even when strain and other variables are controlled. We conclude by discussing the limitations of current work and the implications for next steps in the strain-substance use research literature. 相似文献
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Riccardo Strobino 《逻辑史和逻辑哲学》2019,40(1):42-62
This paper analyzes a classification of different types of demonstration introduced by Alfarabi (d. 950 CE) in his Kitāb al-Burhān (Book of Demonstration). Alfarabi identifies eight combinations of demonstrative syllogisms, grouped in function of the different types of per se relations expressed by their premises and conclusions, where terms are definitionally connected with one another. The list contains a total of thirty-nine moods illustrated by a rich array of examples drawn from various scientific disciplines, including arithmetic, geometry, and natural philosophy. The combinations and moods are discussed extensively by Averroes (d. 1198 CE) in the section of his Epitome of the Organon devoted to the Posterior Analytics and in his Quaesita on logic. Alfarabi’s classification also possibly inspired a simplified taxonomical effort in Avicenna’s (d. 1037 CE) Kitāb al-Burhān. 相似文献
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L. Kevin Hamberger Courtney Barry Zeno Franco 《Journal of aggression, maltreatment & trauma》2019,28(4):425-444
ABSTRACTChronic stress stemming from trauma exposure and posttraumatic stress disorder (PTSD) leads to many health problems that are typically seen by primary care providers. Unfortunately, providers rarely identify trauma as the root cause of patient difficulties. The present paper provides an evidence-based rationale for implementing trauma-informed care principles and processes into medical primary care systems. Beginning with a review of prevalence of trauma exposure and PTSD in primary care clinics, this article elucidates relationships between trauma exposure and behavioral and medical health problems, as well as clinical and physiological pathways that lead from trauma exposure to illness. The article concludes with exposition of trauma-informed interventions that can be implemented in primary care clinics, and discussion of future directions. 相似文献
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Amanda N. Gesselman Carol Y. Franco Elizabeth M. Brogdon Peter B. Gray Justin R. Garcia Helen E. Fisher 《Personal Relationships》2019,26(4):586-601
With the increasing prevalence of single adults in the United States, perceptions of marriage as the relationship “gold standard” may be diminishing. In this study (N = 6,576), we explored perceptions of married life in three subgroups of participants: Those who have never married, ever married, and currently married. Across subgroups, most did not perceive married life more positively than single life in external/tangible domains (e.g., more friends), but did in emotional experiences and frame of mind (e.g., contentment). These findings suggest conceptualizations of marriage may be changing to be less positive or less discrepant from conceptualizations of single life. However, these findings also suggest that people continue to view marital relationships as a positive source of emotional experience and support. 相似文献
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Sara Zaniboni Kimberly Kahn Maria Paola Paladino Franco Fraccaroli 《European Journal of Work and Organizational Psychology》2019,28(4):453-467
Multiple studies have found that older workers may be disadvantaged in their job search due to explicit age stereotypes. However, no published research has examined the effect of both explicit (conscious) and implicit (unconscious) negative age stereotypes against older workers on hiring decisions. The current study fills this gap by using an experimental design to simultaneously examine how both explicit and implicit age stereotypes affect the evaluation of resumes for older and younger job applicants. Participants completed measures of explicit age stereotypes via a questionnaire and implicit age stereotypes with an Implicit Association Test focused on older and younger working-age people. They then completed a resume screening task that included younger and older potential applicants. Results showed that participants’ explicit age stereotypes positively influenced the evaluation of younger applicants’ resumes but had no significant effect on the evaluation of older applicants’ resumes. Conversely, implicit age stereotypes had a negative effect on the evaluation of older applicants’ resumes but had no significant effect on the evaluation of younger applicants’ resumes. The results suggest that both implicit and explicit age stereotypes may harm older job applicants’ hireablity, but through different pathways. 相似文献
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